TWI776611B - Polarization twisting double-pulse beam generating device - Google Patents

Abstract

A polarization twisting double-pulse beam generating device includes a polarizing beam splitter, a first quarter-wave plate, a first pellicle beam splitter, a first reflector, a second quarter-wave plate, a second pellicle beam splitter, and a second reflector. The polarizing beam splitter divides an incident pulsed beam into a first linearly polarized pulsed beam and a second linearly polarized pulsed beam. The first quarter wave plate converts the first linearly polarized pulsed beam into a first circularly polarized pulsed beam. The first pellicle beam splitter and the first reflector respectively convert the first circularly polarized pulsed beam into a second circularly polarized pulsed beam and a third circularly polarized pulsed beam. The second quarter wave plate converts the second linearly polarized pulsed beam into a fourth circularly polarized pulsed beam. The second pellicle beam splitter and the second reflector respectively convert the fourth circularly polarized pulsed beam into a fifth circularly polarized pulsed beam and a sixth circularly polarized pulsed beam.

Description

Polarization Twisted Double Pulse Light Generation Device

The present invention relates to a pulsed light generating device, and particularly to a polarization-twisted double pulsed light generating device.

At present, dual-pulse generation systems with arbitrary polarization are not common, and have many inconveniences and limitations, such as the inability to change the operating frequency, the inability to greatly adjust the interval of the dual-pulse, and the invariability of the pulse helicity.

The current generation of optical rotation systems are mainly divided into two types: one is to use a wave plate, that is, a passive optical element, such as a half-wave plate or a quarter-wave plate, to change the polarization state of the light source; the second is to use the space A spatial light modulator (SLM) adjusts the phase of the pulsed light, so that the polarization state of the light changes after passing through the modulator. These two main methods have their limitations. If passive components such as wave plates are used, the operating frequency will be limited, and the operating frequency cannot be changed after the component is fabricated, so the same system cannot be applied to light of different wavelengths; and the method related to the use of spatial light modulators is subject to Limited to the damage threshold, so the energy of the pulsed light will be limited, especially the output pulse of the laser amplifier, and the interval of the double pulse is limited by the spatial resolution of the modulator, usually the pulse interval is not easy to exceed 10 picoseconds. The double-pulse light generation method used in the traditional technology is to use the two arms of the Michelson interferometer to generate a pulse, and its polarization is linear polarization, and the polarization of the double pulse is fixed to be linear polarization perpendicular to each other, that is, one is horizontal, and the other is horizontal. is vertical, and other than that, no other polarization state can be produced. Although the pulse interval of this method has a higher degree of freedom than the previous method, the limitation of polarization makes this system limited to linear polarization applications.

Therefore, the present invention is aimed at solving the above-mentioned problems, and proposes a double-pulse light generating device to solve the conventional problems.

The invention provides a double-pulse light generating device, which is a double-pulse light source with arbitrary polarization and twist. This architecture not only has a higher destruction threshold and degree of freedom, but also has better controllability than traditional polarization control systems, such as passive wave plates or spatial light modulators. Besides the torsional frequency, rotation and pulse interval can be adjusted arbitrarily, this structure can be adjusted in time according to different purposes. Also because of its higher destruction threshold, for samples with polarization selectivity, such as magnetic or spin-related materials, there is more opportunity to use excitation detection spectroscopy and other methods for measurement, such as the previous pulse as excitation light, Then the pulse is used as probe light and so on.

In one embodiment of the present invention, a polarization-twisted double-pulse light generating device is provided, which includes a polarization beam splitter, a first quarter-wave plate, a first thin-film beam splitter, a first reflection mirror, A second quarter wave plate, a second thin film beam splitter and a second reflector. The polarizing beam splitter is located on the transmission path of an incident pulsed light. The polarization beam splitter is used for dividing the incident pulse light into a first linearly polarized pulse light and a second linearly polarized pulse light, and for reflecting the first linearly polarized pulse light. The first quarter-wave plate is disposed opposite the polarization beam splitter, and the first quarter-wave plate is used for converting the first linearly polarized pulse light into a first circularly polarized pulse light. The first pellicle beam splitter is disposed relative to the first quarter wave plate, and the first reflecting mirror is disposed relative to the first pellicle beam splitter. The first thin-film beam splitter and the first reflecting mirror are used for converting the first circularly polarized pulse light into a second circularly polarized pulsed light and a third circularly polarized pulsed light respectively. The first quarter-wave plate is used for converting the second circularly polarized pulse light and the third circularly polarized pulsed light into a third linearly polarized pulsed light and a fourth linearly polarized pulsed light respectively passing through the polarization beam splitter in sequence. The second quarter-wave plate is disposed opposite the polarization beam splitter, and the second quarter-wave plate is used for converting the second linearly polarized pulse light into a fourth circularly polarized pulse light. The second pellicle beam splitter is arranged relative to the second quarter wave plate, and the second mirror is arranged relative to the second pellicle beam splitter. The second thin-film beam splitter and the second mirror are used to convert the fourth circularly polarized pulse light into a fifth circularly polarized pulsed light and a sixth circularly polarized pulsed light respectively, and the second quarter wave plate is used to convert the fifth circularly polarized pulsed light The circularly polarized pulse light and the sixth circularly polarized pulsed light are respectively a fifth linearly polarized pulsed light and a sixth linearly polarized pulsed light, and the polarized beam splitter is used for the fifth circularly polarized pulsed light and the sixth circularly polarized pulsed light to be reflected in sequence. Polarized pulsed light.

In an embodiment of the present invention, the polarization-twisted double-pulse light generating device further includes a wave plate, wherein the wave plate is disposed beside the polarization beam splitter and located on the transmission path of the incident pulse light.

In an embodiment of the present invention, the wave plate is a half wave plate.

In an embodiment of the present invention, the polarization-twisted double-pulse light generating device further includes an optical pulse stretcher, wherein the optical pulse stretcher is disposed in front of the polarization beam splitter and located on the transmission path of the incident pulse light.

In an embodiment of the present invention, the optical pulse stretcher is a pair of crystals or a pair of gratings.

In an embodiment of the present invention, the first pellicle beam splitter moves relative to the first quarter-wave plate along the transmission path of the first circularly polarized pulse light.

In an embodiment of the present invention, the first reflecting mirror moves relative to the first pellicle beam splitter along the transmission path of the first circularly polarized pulse light.

In an embodiment of the present invention, the second pellicle beam splitter moves relative to the second quarter-wave plate along the transmission path of the fourth circularly polarized pulse light.

In one embodiment of the present invention, the second mirror moves relative to the second pellicle beam splitter along the transmission path of the fourth circularly polarized pulsed light.

In an embodiment of the present invention, the polarization-twisted double-pulse light generating device further includes a third quarter-wave plate, wherein the third quarter-wave plate is disposed opposite the polarization beam splitter and is located in the third linear polarization On the transmission path of the pulsed light, the fourth linearly polarized pulsed light, the fifth linearly polarized pulsed light, and the sixth linearly polarized pulsed light

In an embodiment of the present invention, the incident pulse light is a laser pulse beam.

Based on the above, the polarization-twisted double-pulse light generating device utilizes a quarter-wave plate, and adjusts the relative positions of the thin-film beam splitter and the reflector, so as to generate a double-pulse light source with arbitrary polarization and twist. This architecture not only has a higher destruction threshold and degree of freedom, but also has better controllability than traditional polarization control systems, such as passive wave plates or spatial light modulators. Besides the torsional frequency, rotation and pulse interval can be adjusted arbitrarily, this structure can be adjusted in time according to different purposes. Also because of its higher destruction threshold, for samples with polarization selectivity, such as magnetic or spin-related materials, there is more opportunity to use excitation detection spectroscopy and other methods for measurement, such as the previous pulse as excitation light, Then the pulse is used as probe light and so on.

Hereby, in order to make your examiners have a further understanding and understanding of the structural features of the present invention and the effects achieved, I would like to assist with the preferred embodiment drawings and coordinate detailed descriptions, and the descriptions are as follows:

Embodiments of the present invention will be further explained with the help of the related drawings below. Wherever possible, in the drawings and the description, the same reference numbers refer to the same or similar components. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It should be understood that the elements not particularly shown in the drawings or described in the specification have forms known to those of ordinary skill in the art. Those skilled in the art can make various changes and modifications based on the content of the present invention.

Certain terms are used in the specification and claims to refer to particular elements. However, those of ordinary skill in the art should understand that the same elements may be referred to by different nouns. The description and the scope of the patent application do not use the difference in name as a way of distinguishing elements, but use the difference in function of the elements as a basis for distinguishing. The "comprising" mentioned in the description and the scope of the patent application is an open-ended term, so it should be interpreted as "including but not limited to". In addition, "coupled" herein includes any direct and indirect means of connection. Therefore, if it is described in the text that the first element is coupled to the second element, it means that the first element can be directly connected to the second element through electrical connection or signal connection such as wireless transmission or optical transmission, or through other elements or connections. The means are indirectly electrically or signally connected to the second element.

The following description of "one embodiment" or "an embodiment" refers to a particular element, structure or feature associated with at least one embodiment. Thus, the appearances of "one embodiment" or "an embodiment" in various places below are not directed to the same embodiment. Furthermore, the specific components, structures and features in one or more embodiments may be combined in a suitable manner.

Unless otherwise specified, some conditional sentences or words, such as "can", "could", "might", or "may", are usually intended to express that the embodiments of this case have, However, it can also be interpreted as features, elements, or steps that may not be required. In other embodiments, these features, elements, or steps may not be required.

FIG. 1 is a schematic diagram of the first embodiment of the polarization-twisted double-pulse light generating device of the present invention. Referring to FIG. 1, the following describes a first embodiment of the polarization-twisted double-pulse light generating device of the present invention. The polarization twisted double pulse light generating device 1 includes a polarizing beam splitter 10, a first quarter wave plate 11, a first pellicle beam splitter 12, and a first reflecting mirror 13. A second quarter wave plate 14, a second thin film beam splitter 15 and a second reflector 16, among which the polarization beam splitter 10, the first quarter wave plate 11, the first thin film beam splitter 12. The first reflecting mirror 13, the second quarter-wave plate 14, the second thin-film beam splitter 15 and the second reflecting mirror 16 can form a type of Michelson interferometer, the first quarter-wave plate 11. The first thin-film beamsplitter 12 and the first reflecting mirror 13 form the H arm of the Michelson-like interferometer, and the second quarter-wave plate 14, the second thin-film beamsplitter 15 and the second reflecting mirror 16 form the Michelson-like interferometer. The V-arm of the interferometer. The polarizing beam splitter 10 is composed of two horns, and has a first plane 101 , a second plane 102 , a light emitting plane 103 , and a beam splitting interface 104 located between the first plane 101 and the second plane 102 . The polarizing beam splitter 10 is located on the transmission path of an incident pulsed light P. The first quarter-wave plate 11 is arranged relative to the first plane 101 of the polarization beam splitter 10 , the first thin-film beam splitter 12 is arranged relative to the first quarter-wave plate 11 , and the first reflecting mirror 13 is arranged relative to the first plane 101 of the polarization beam splitter 10 . A pellicle beam splitter 12 is provided. The second quarter wave plate 14 is disposed opposite to the second plane 102 of the polarization beam splitter 10 , the second pellicle beam splitter 15 is disposed opposite the second quarter wave plate 14 , and the second reflecting mirror 16 is disposed opposite to the second plane 102 of the polarization beam splitter 10 . The second pellicle beam splitter 15 is disposed. The polarization-twisted double-pulse light generating device 1 may further include a light pulse stretcher 17 , such as a pair of crystals or a pair of gratings. The optical pulse stretcher 17 is disposed in front of the polarization beam splitter 10 and is located on the transmission path of the incident pulse light P. In one embodiment, the incident pulsed light P may come from a pulsed light source, which may be a pulsed laser oscillator, such as a nanosecond, picosecond or femtosecond laser. Therefore, the incident pulse light P can be a laser pulse beam. In another embodiment, the pulsed light source can also be a linearly polarized pulsed flash lamp (pulsed flash lamp) or a linearly polarized pulsed light-emitting diode (Pulsed Light Emitting Diode, Pulsed LED), so the incident pulsed light P can also be a medical The pulsed light used is not limited to a laser pulsed beam.

The optical pulse stretcher 17 can stretch the incident pulse light P, that is, first reduce the peak power of the incident pulse light P and increase the controllable range of the double-pulse light generating device, and then transmit the incident pulse light P to the polarization beam splitter 10 . Next, the polarization beam splitter 10 divides the incident pulse light P into a first linearly polarized pulse light L1 passing through the first plane 101 of the polarization beam splitter 10 and a light splitting interface 104 passing through the polarization beam splitter 10 and the second The second linearly polarized pulsed light L2 on the plane 102, and the light splitting interface 104 of the polarized beam splitter 10 reflects the first linearly polarized pulsed light L1. Wherein, the polarization directions of the first linearly polarized pulse light L1 and the second linearly polarized pulsed light L2 are perpendicular to each other, for example, the first linearly polarized pulsed light L1 and the second linearly polarized pulsed light L2 are S-polarized pulsed light and P-polarized pulsed light respectively , or P-polarized pulsed light and S-polarized pulsed light, respectively.

The first quarter wave plate 11 converts the first linearly polarized pulsed light L1 into a first circularly polarized pulsed light C1. A part of the first circularly polarized pulsed light C1 is reflected by the first thin-film beam splitter 12 , and the remaining part penetrates the first thin-film beam splitter 12 and is reflected by the first reflecting mirror 13 . Therefore, the first thin-film beam splitter 12 and the first reflecting mirror 13 respectively convert the first circularly polarized pulsed light C1 into a second circularly polarized pulsed light C2 and a third circularly polarized pulsed light C3. The polarization states of the first circularly polarized pulsed light C1 and the second circularly polarized pulsed light C2 are opposite, for example, the first circularly polarized pulsed light C1 and the second circularly polarized pulsed light C2 are left-handed light and right-handed light respectively, or Right-handed and left-handed. The polarization states of the first circularly polarized pulsed light C1 and the third circularly polarized pulsed light C3 are also opposite. The first quarter-wave plate 11 converts the second circularly polarized pulsed light C2 and the third circularly polarized pulsed light C3 into a third linearly polarized light that penetrates the first plane 101 of the polarizing beam splitter 10 and the beam splitting interface 104 in sequence, respectively The pulsed light L3 and a fourth linearly polarized pulsed light L4. Finally, the third linearly polarized pulse light L3 and the fourth linearly polarized pulsed light L4 are emitted from the light emitting surface 103 of the polarization beam splitter 10 .

Similarly, the second quarter wave plate 14 converts the second linearly polarized pulsed light L2 into a fourth circularly polarized pulsed light C4. The second pellicle beam splitter 15 and the second reflecting mirror 16 respectively convert the fourth circularly polarized pulsed light C4 into a fifth circularly polarized pulsed light C5 and a sixth circularly polarized pulsed light C6. The polarization states of the fourth circularly polarized pulsed light C4 and the fifth circularly polarized pulsed light C5 are opposite, for example, the fourth circularly polarized pulsed light C4 and the fifth circularly polarized pulsed light C5 are left-handed light and right-handed light respectively, or Right-handed and left-handed. The polarization states of the fourth circularly polarized pulsed light C4 and the sixth circularly polarized pulsed light C6 are also opposite. The second quarter-wave plate 14 converts the fifth circularly polarized pulsed light C5 and the sixth circularly polarized pulsed light C6 into a fifth linearly polarized pulsed light L5 and a sixth linearly polarized pulsed light L6, respectively, and the polarization beam splitter The fifth linearly polarized pulsed light L5 and the sixth linearly polarized pulsed light L6 are sequentially reflected by the optical splitting interface 104 of 10 . Finally, the fifth linearly polarized pulse light L5 and the sixth linearly polarized pulsed light L6 are emitted from the light emitting surface 103 of the polarizing beam splitter 10 .

In order to calculate the twisting frequency of the polarization-twisted double-pulse light, the polarization-twisted double-pulse light generating device 1 may further include a third quarter-wave plate 18 , wherein the third quarter-wave plate 18 is relatively polarized The light emitting surface 103 of the beam splitter 10 is disposed and located on the transmission path of the third linearly polarized pulsed light L3, the fourth linearly polarized pulsed light L4, the fifth linearly polarized pulsed light L5 and the sixth linearly polarized pulsed light L6. The third quarter wave plate 18 converts the third linearly polarized pulsed light L3, the fourth linearly polarized pulsed light L4, the fifth linearly polarized pulsed light L5 and the sixth linearly polarized pulsed light L6 into the second circularly polarized pulsed light C2, The third circularly polarized pulsed light C3, the fifth circularly polarized pulsed light C5, and the sixth circularly polarized pulsed light C6. Since the second circularly polarized pulse light C2 and the fifth circularly polarized pulsed light C5 are reflected by the thin-film beam splitter, the second circularly polarized pulsed light C2 and the fifth circularly polarized pulsed light C5 are called the leading pulse of the polarization twisted double pulse. ), the third circularly polarized pulse light C3 and the sixth circularly polarized pulsed light C6 are reflected by the mirror, so the third circularly polarized pulsed light C3 and the sixth circularly polarized pulsed light C6 are called after the polarization twist double pulse (lagging pulse ). Assuming that the angle of the third quarter-wave plate 18 is set to 45 degrees, it means that the front pulse is a right-handed polarized twist pulse, and the rear pulse is a left-handed polarized twist pulse. In order to generate a double-pulse light source with arbitrary polarization and twist, the first thin-film beam splitter 12 can move relative to the first quarter-wave plate 11 along the transmission path of the first circularly polarized pulse light C1, and the first reflecting mirror 13 can move along the transmission path of the first circularly polarized pulse light C1. The second pellicle beam splitter 15 can move relative to the first pellicle beam splitter 12 along the transmission path of the first circularly polarized pulsed light C1, and the second pellicle beamsplitter 15 can move relative to the second quarter wave plate along the transmission path of the fourth circularly polarized pulsed light C4. 14 moves, the second mirror 16 can move relative to the second pellicle beam splitter 15 along the transmission path of the fourth circularly polarized pulsed light C4. In this way, the distance between the first pellicle beam splitter 12 and the first reflecting mirror 13 can be affected, and the distance between the second pellicle beam splitter 15 and the second reflecting mirror 16 can also be affected.

FIG. 2 is a zero-phase diagram of the second circularly polarized pulse light, the third circularly polarized pulsed light, the fifth circularly polarized pulsed light, and the sixth circularly polarized pulsed light of the present invention. The torsional frequency of the double pulse can be calculated by using the zero-phase diagram. This torsional frequency can be regarded as the result of differential frequency generation (DFG). Therefore, to calculate the torsional frequency, it is only necessary to subtract the instantaneous frequency of the V arm at any time point from the The instantaneous frequency of the H arm can be removed, and the frequency of the right-handed polarized twist pulse is defined as positive. As shown in Figures 1 and 2, the twist frequency of the pre-pulse is D1, and the twist frequency of the post-pulse is -D2, wherein the optical pulse stretcher 17 can adjust the upper and lower limits of the twist frequency. Obviously, as long as the relative position of the thin-film beamsplitter and the terminal reflector is adjusted, optically active double pulses of any frequency, any interval and any helicity can be achieved, where the helicity means the positive and negative of the torsional frequency. With different power ratios, double pulses of any polarization can be achieved. In practice, to measure the zero-phase image of a pulse, a cross frequency-resolved optical gating (XFROG) measurement can be used. Although XFROG measurements will contain non-zero phase results, the torsional frequency of the double pulse can still be estimated.

FIG. 3 is a schematic diagram of a second embodiment of the polarization-twisted double-pulse light generating device of the present invention. Referring to FIG. 3, the second embodiment of the polarization-twisted double-pulse light generating device of the present invention will be described below. The difference between the second embodiment and the first embodiment is that the polarization-twisted double-pulse light generating device 1 of the second embodiment further includes a wave plate 19 , such as a half wave plate, wherein the wave plate 19 is disposed on the polarization beam splitter 10 beside and on the transmission path of the incident pulsed light P and an initial pulsed light P'. The method of generating the initial pulse light P' is described as follows: First, the pulse light source generates the initial pulse light P', wherein the initial pulse light P' is directly emitted by the pulse light source, and the initial pulse light P' can be a laser pulse beam or other A non-laser oscillator, such as pulsed light generated by a pulsed flash lamp or a pulsed light-emitting diode, does not limit the initial pulsed light P' to be a laser pulsed beam in the present invention. Next, let the initial pulse light P' pass through the optical pulse stretcher 17 and the wave plate 19 in sequence, that is, let the wave plate 19 be located on the transmission path of the initial pulse light P'. The optical pulse stretcher 17 can stretch the initial pulse light P', and then when the initial pulse light P' passes through the wave plate 19, the wave plate 19 will change the polarization state of the initial pulse light P' to convert the initial pulse light P' into an incident pulse For the light P, the incident pulse light P can contain S-polarized light and P-polarized light. In addition, rotating the wave plate 19 can change the energy ratio of the S-polarized light and the P-polarized light in the incident pulse light P, such as increasing the energy of the S-polarized light and decreasing the energy of the P-polarized light; or increasing the P-polarized light energy, reducing the energy of S-polarized light.

According to the above-mentioned embodiment, the polarization-twisted double-pulse light generating device utilizes a quarter-wave plate and adjusts the relative positions of the thin-film beam splitter and the reflecting mirror, so as to generate a double-pulse light source with arbitrary polarization and twist. This architecture not only has a higher destruction threshold and degree of freedom, but also has better controllability than traditional polarization control systems, such as passive wave plates or spatial light modulators. Besides the torsional frequency, rotation and pulse interval can be adjusted arbitrarily, this structure can be adjusted in time according to different purposes. Also, because the components in this double-pulse light generating device have a higher destruction threshold, for samples with polarization selectivity, such as magnetic or spin-related materials, there is more opportunity to use excitation detection spectroscopy and other methods for quantitative analysis. For example, the former pulse is used as the excitation light, and the latter pulse is used as the detection light, etc.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all changes and modifications made in accordance with the shape, structure, feature and spirit described in the scope of the patent application of the present invention are equivalent. , shall be included in the scope of the patent application of the present invention.

1: Polarization Twisted Double Pulse Light Generation Device

10: Polarization Beamsplitter

101: The first plane

102: Second plane

103: light-emitting surface

104: Spectral Interface

11: The first quarter wave plate

12: The first thin film beamsplitter

13: The first reflector

14: Second quarter wave plate

15: Second Thin Film Beamsplitter

16: Second reflector

17: Optical Pulse Stretcher

18: Third quarter wave plate

19: wave plate

P: Incident pulsed light

L1: The first linearly polarized pulsed light

L2: The second linearly polarized pulsed light

C1: The first circularly polarized pulsed light

C2: The second circularly polarized pulsed light

C3: The third circularly polarized pulsed light

L3: The third linearly polarized pulsed light

L4: Fourth linearly polarized pulsed light

C4: Fourth circularly polarized pulsed light

C5: Fifth circularly polarized pulsed light

C6: Sixth circularly polarized pulsed light

L5: Fifth linearly polarized pulsed light

L6: Sixth linearly polarized pulsed light

D1, D2: torsion frequency

P': initial pulsed light

FIG. 1 is a schematic diagram of the first embodiment of the polarization-twisted double-pulse light generating device of the present invention. FIG. 2 is a zero-phase diagram of the second circularly polarized pulse light, the third circularly polarized pulsed light, the fifth circularly polarized pulsed light, and the sixth circularly polarized pulsed light of the present invention. FIG. 3 is a schematic diagram of a second embodiment of the polarization-twisted double-pulse light generating device of the present invention.

1: Polarization Twisted Double Pulse Light Generation Device

10: Polarization Beamsplitter

101: The first plane

102: Second plane

103: light-emitting surface

104: Spectral Interface

11: The first quarter wave plate

12: The first thin film beamsplitter

13: The first reflector

14: Second quarter wave plate

15: Second Thin Film Beamsplitter

16: Second reflector

17: Optical Pulse Stretcher

18: Third quarter wave plate

P: Incident pulsed light

L1: The first linearly polarized pulsed light

L2: The second linearly polarized pulsed light

C1: The first circularly polarized pulsed light

C2: The second circularly polarized pulsed light

C3: The third circularly polarized pulsed light

L3: The third linearly polarized pulsed light

L4: Fourth linearly polarized pulsed light

C4: Fourth circularly polarized pulsed light

C5: Fifth circularly polarized pulsed light

C6: Sixth circularly polarized pulsed light

L5: Fifth linearly polarized pulsed light

L6: Sixth linearly polarized pulsed light

Claims (11)

A polarization-twisted double-pulse light generating device, comprising: A polarization beam splitter is located on the transmission path of an incident pulse light, wherein the polarization beam splitter is used for dividing the incident pulse light into a first linearly polarized pulse light and a second linearly polarized pulse light, and for reflecting the first linearly polarized pulsed light; a first quarter-wave plate, disposed opposite to the polarization beam splitter, wherein the first quarter-wave plate is used to convert the first linearly polarized pulsed light into a first circularly polarized pulsed light; A first thin film beam splitter and a first reflection mirror, the first thin film beam splitter is arranged relative to the first quarter-wave plate, the first reflection mirror is arranged relative to the first thin film beam splitter, wherein the The first thin-film beam splitter and the first reflecting mirror are used to convert the first circularly polarized pulse light into a second circularly polarized pulsed light and a third circularly polarized pulsed light respectively, and the first quarter wave plate is used for Converting the second circularly polarized pulse light and the third circularly polarized pulsed light into a third linearly polarized pulsed light and a fourth linearly polarized pulsed light respectively penetrating the polarization beam splitter in sequence; a second quarter-wave plate disposed opposite to the polarization beam splitter, wherein the second quarter-wave plate is used for converting the second linearly polarized pulsed light into a fourth circularly polarized pulsed light; and A second pellicle beam splitter and a second reflection mirror, the second pellicle beamsplitter is arranged relative to the second quarter-wave plate, the second reflection mirror is arranged relative to the second pellicle beamsplitter, wherein The second thin-film beam splitter and the second reflecting mirror are used to convert the fourth circularly polarized pulse light into a fifth circularly polarized pulsed light and a sixth circularly polarized pulsed light respectively. The second quarter wave plate is used for In order to convert the fifth circularly polarized pulse light and the sixth circularly polarized pulse light into a fifth linearly polarized pulsed light and a sixth linearly polarized pulsed light respectively, the polarization beam splitter is used for sequentially reflecting the fifth line polarized pulse light and the sixth linearly polarized pulse light. The polarization-twisted double-pulse light generating device according to claim 1, further comprising a wave plate, wherein the wave plate is disposed beside the polarization beam splitter and is located on the transmission path of the incident pulse light. The polarization-twisted double-pulse light generating device according to claim 2, wherein the wave plate is a half wave plate. The polarization-twisted double-pulse light generating device according to claim 1, further comprising an optical pulse stretcher, wherein the optical pulse stretcher is disposed in front of the polarization beam splitter and located on the transmission path of the incident pulse light. The polarization-twisted double-pulse light generating device according to claim 4, wherein the light pulse stretcher is a pair of crystals or a pair of gratings. The polarization-twisted double-pulse light generating device according to claim 1, wherein the first pellicle beam splitter moves relative to the first quarter-wave plate along the transmission path of the first circularly polarized pulse light. The polarization-twisted double-pulse light generating device according to claim 1, wherein the first reflecting mirror moves relative to the first pellicle beamsplitter along the transmission path of the first circularly polarized pulsed light. The polarization-twisted double-pulse light generating device according to claim 1, wherein the second pellicle beam splitter moves relative to the second quarter-wave plate along the transmission path of the fourth circularly polarized pulse light. The polarization-twisted double-pulse light generating device according to claim 1, wherein the second mirror moves relative to the second pellicle beam splitter along the transmission path of the fourth circularly polarized pulse light. The polarization-twisted double-pulse light generating device as claimed in claim 1, further comprising a third quarter-wave plate, wherein the third quarter-wave plate is disposed opposite the polarization beam splitter and is located in the first quarter-wave plate. The third linearly polarized pulse light, the fourth linearly polarized pulsed light, the fifth linearly polarized pulsed light and the sixth linearly polarized pulsed light are on the transmission path. The polarization-twisted double-pulse light generating device according to claim 1, wherein the incident pulse light is a laser pulse beam.

Images