CN108683070B - An ultrafast laser generator - Google Patents
An ultrafast laser generator Download PDFInfo
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- CN108683070B CN108683070B CN201810623173.7A CN201810623173A CN108683070B CN 108683070 B CN108683070 B CN 108683070B CN 201810623173 A CN201810623173 A CN 201810623173A CN 108683070 B CN108683070 B CN 108683070B
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- 239000013078 crystal Substances 0.000 claims abstract description 26
- 230000010287 polarization Effects 0.000 claims abstract description 24
- 239000006096 absorbing agent Substances 0.000 claims abstract description 18
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 1
- 238000002310 reflectometry Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/107—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using electro-optic devices, e.g. exhibiting Pockels or Kerr effect
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
本发明公开了一种超快激光发生器，涉及激光技术领域。包括：在预设轴线上依次排列的饱和吸收体、激光晶体、电光调制器、偏振反射镜和高反射镜，偏振反射镜与轴线之间呈预设角度，电光调制器用于当从高反射镜输出的激光满足预设条件时，改变激光的偏振方向，使激光从偏振反射镜反射输出，得到超快激光。本发明提供的超快激光发生器，能够稳定产生脉宽短且能量高的超快激光，并具有结构简单、体积小的优点。
The present invention discloses an ultrafast laser generator, which relates to the field of laser technology. The ultrafast laser generator comprises: a saturated absorber, a laser crystal, an electro-optic modulator, a polarizing reflector and a high reflector arranged in sequence on a preset axis, the polarizing reflector forms a preset angle with the axis, and the electro-optic modulator is used to change the polarization direction of the laser when the laser output from the high reflector meets a preset condition, so that the laser is reflected and output from the polarizing reflector to obtain an ultrafast laser. The ultrafast laser generator provided by the present invention can stably generate ultrafast lasers with short pulse width and high energy, and has the advantages of simple structure and small size.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to an ultrafast laser generator.
Background
The ultrafast laser has short pulse time and high peak power, and is widely applied to scientific research and production activities at present. Existing ultrafast lasers are typically produced by SESAM (semiconductor saturable absorber mirror) mode-locked cavity oscillators, ultrafast pulse chirped amplifiers, mode-locked oscillators for disc media, and the like.
The existing ultrafast laser generating device has the following problems: the structure is complex, the volume is large, and the ultra-fast laser pulse output with short pulse width and large single pulse energy can not be stably generated.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultrafast laser generator aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
An ultrafast laser generator, comprising: the laser beam reflection device comprises a saturated absorber, a laser crystal, an electro-optic modulator, a polarization reflector and a high reflector which are sequentially arranged on a preset axis, wherein a preset angle is formed between the polarization reflector and the axis, and the electro-optic modulator is used for changing the polarization direction of laser beam when laser beam output from the high reflector meets preset conditions, so that the laser beam is reflected and output from the polarization reflector, and ultra-fast laser beam is obtained.
The beneficial effects of the invention are as follows: the ultrafast laser generator provided by the invention can stably generate ultrafast laser with short pulse width and high energy, and has the advantages of simple structure and small volume.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of an ultrafast laser generator according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an ultrafast laser generator according to another embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present invention.
As shown in fig. 1, a schematic structural diagram is provided for an embodiment of an ultrafast laser generator of the present invention, in which broken lines represent laser paths, and the ultrafast laser generator includes: the laser beam ultra-fast laser comprises a saturated absorber 1, a laser crystal 2, an electro-optical modulator 3, a polarized reflector 4 and a high reflector 5 which are sequentially arranged on a preset axis, wherein a preset angle is formed between the polarized reflector 4 and the axis, and the electro-optical modulator 3 is used for changing the polarization direction of laser light when laser light output from the high reflector 5 meets preset conditions, so that the laser light is reflected and output from the polarized reflector 4, and ultra-fast laser light is obtained.
The preset axis may be a direction in which the laser light oscillates between the saturated absorber 1 and the high reflecting mirror 5.
It should be understood that, in order to generate laser light, the saturated absorber 1 should be kept parallel to the high mirror 5 so that the laser light oscillates back and forth between the saturated absorber 1 and the high mirror 5, and the initial light generated by the saturated absorber 1 should pass through the laser crystal 2, generating polarized light of high coherence.
It will be appreciated that to produce an ultrafast laser, the reflectivity of the high mirror 5 may be 99.99%.
It should be understood that, in order to generate ultra-fast laser light, most of the laser light should be able to transmit through the polarizing mirror 4 when the laser light oscillates back and forth between the saturated absorber 1 and the high reflecting mirror 5, that is, the reflectivity of the polarizing mirror 4 for the laser light during oscillation should be as small as possible, and the reflectivity should be as large as possible for the laser light after changing the polarization direction, that is, the ratio of the reflectivity of the polarizing mirror 4 for the laser light before and after changing the polarization direction should be as close to 0 as possible: infinity.
For example, assuming that the polarization angle of the laser light during oscillation is a and the polarization angle of the laser light after changing the polarization direction is b, the reflectivity of the polarizing mirror 4 should be close to 0 for the laser light with the polarization angle a; the reflectance of the polarization mirror 4 for the laser light having the polarization angle b should be close to +.
It should be noted that, in order to make the generated ultrafast laser output from between the saturated absorber 1 and the high reflector 5, the polarizing reflector 4 should have a preset angle with the axis, so that the ultrafast laser is emitted, and the preset angle may be set according to actual requirements.
For example, in order to output the ultrafast laser light parallel to a preset axis, the polarizing mirror 4 may be angled at 45 ° to the axis.
It should be noted that, in order to generate the ultrafast laser, after generating the ultrafast laser with a short pulse width and high energy, the ultrafast laser may be output, that is, the preset condition that the laser output from the high reflector 5 should meet may be that the single pulse energy of the laser output from the high reflector 5 reaches a preset energy value, and the preset energy value may be set according to the actual requirement.
The preset condition may be other conditions, for example, heat generated by the laser in a unit time, or the like, and may be the preset condition.
It should be noted that, the electro-optical modulator 3 may include a pockel cell, where the pockel cell may be placed on an oscillation path of the laser, and the laser may pass through the pockel cell during oscillation, and may change a refractive index of an electro-optical crystal in the pockel cell by applying a high voltage to the pockel cell, so as to implement a half wave plate function, thereby changing a polarization direction of the laser.
It will be appreciated that the total loss from the saturated absorber 1 to the high mirror 5 must be less than the gain produced by the laser crystal 2 after it has been pumped by the pump light.
The ultrafast laser generator provided by the embodiment can stably generate ultrafast laser with short pulse width and high energy, and has the advantages of simple structure and small volume.
Some alternative embodiments of the present invention will be described with reference to fig. 2, in which broken lines represent laser paths and solid lines represent wired or wireless connections.
Alternatively, in some embodiments, the electro-optic modulator 3 may comprise: the pockels cell 31 and the high voltage signal generator 32, wherein the pockels cell 31 is arranged on an axis and is arranged between the laser crystal 2 and the polarizing mirror 4, the high voltage signal generator 32 is used for transmitting a high voltage signal to the pockels cell 31, and the pockels cell 31 is used for changing the refractive index of the electro-optical crystal in the cell according to the high voltage signal, so that the polarization direction of the laser passing through the pockels cell 31 is changed.
It should be understood that, in the initial state, the high voltage on the pockels cell 31 may be set to 0, and when the pulse energy of the laser light output from the high mirror 5 reaches a predetermined value, the high voltage is generated by the high voltage signal generator 32, and the refractive index of the electro-optic crystal in the pockels cell 31 is changed to realize the half wave plate function.
Optionally, in some embodiments, the electro-optic modulator 3 may further comprise: a controller 33 and a photodetector 34, the photodetector 34 being arranged on an axis for detecting pulse energy of the laser light output from the high mirror 5, the controller 33 being configured to acquire the pulse energy and to drive the high voltage signal generator 32 to generate a high voltage signal when the pulse energy reaches a preset value.
It should be understood that the controller 33 may drive the high voltage signal generator 32 to generate the high voltage signal when the pulse energy of the laser light output from the high mirror 5 reaches a preset value, but the controller 33 may stop driving the high voltage signal generator 32 to generate the high voltage signal when the pulse energy of the laser light output from the high mirror 5 does not reach the preset value. The switching time is directly determined by the rising and falling edge times of the high voltage applied to the electro-optic crystal.
Optionally, in some embodiments, the photodetector 34 may be further configured to detect a pulse time of the laser light output from the high-reflection mirror 5, and the controller 33 is further configured to obtain a time when the high-voltage signal generator 32 is driven to generate the high-voltage signal according to the pulse time and the cavity length of the ultrafast laser generator, and drive the high-voltage signal generator 32 to generate the high-voltage signal at the time.
Optionally, in some embodiments, a seismic isolation platform may also be included.
Optionally, in some embodiments, a cooling device may be further included, which is disposed within the heat sink of the laser crystal 2.
It should be appreciated that the laser crystal 2 needs to be actively cooled, and the cooling device may be a water cooling pipeline, and be disposed in a heat sink of the laser crystal 2, for cooling the laser crystal 2.
Since the multi-path reflecting cavity in the laser generator generally has the function of prolonging the laser cavity length, the resonant cavity in the application is equivalent to the three parts of the saturated absorber 1, the laser crystal 2 and the high reflecting mirror 5. When pump laser is input into the laser crystal 2 from the saturation absorber 1, the lower energy level particles of the laser crystal 2 are pumped to an upper energy level, the population inversion is formed, and an ultrafast laser pulse is output from the high mirror 5. At this time, the single pulse energy of the output laser pulse is obtained by detection by the photodetector 34. When the ultrafast laser generator reaches dynamic equilibrium, the photodetector 34 can detect a stable ultrafast laser pulse output.
Since the reflectivity of the high mirror 5 is large, the laser single pulse energy oscillating in the resonant cavity at this time is much larger than the single pulse energy output from the high mirror 5. Taking a reflectivity of 99.99% as an example, the intracavity laser monopulse energy is ten thousand times the laser monopulse energy output from the high mirror 5. When the single pulse energy monitored by the controller 33 reaches a set expected value, the refractive index of the electro-optic crystal in the pockels cell 31 is changed by controlling the high voltage signal input to the pockels cell 31, so that the half wave plate function is realized, and the laser pulse oscillated in the cavity is completely output from the polarization reflector 4. This means that the single pulse energy of the ultrafast pulses output at this time is several orders of magnitude higher than the pulse energy output from the high mirror 5, while the pulse width remains unchanged.
The output cavity mirrors of the existing ultrafast laser seeds all have fixed reflectivity. In the design of the reflectivity of the output mirror, if the design reflectivity is too low, the pulse width of the generated ultrafast pulse is too large; if the design reflectivity is too high, the output energy is too low. Therefore, it is difficult to obtain a high-energy, short pulse width laser output directly through the ultrafast laser resonator. In the above embodiments, by using the intracavity polarization coupling output method, the contradiction between the short pulse width output and the high energy output is solved, and after appropriate intracavity parameter design is performed, the single pulse ultrafast laser output with the size of more than 50 microjoules can be obtained, and compared with the single pulse output energy of the existing solid ultrafast laser oscillator, the single pulse ultrafast laser output with the size of at least 2 orders of magnitude can be improved.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and units described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (1)
1. An ultrafast laser generator, comprising: the laser beam reflection device comprises a saturated absorber, a laser crystal, an electro-optic modulator, a polarization reflector and a high reflector which are sequentially arranged on a preset axis, wherein a preset angle is formed between the polarization reflector and the axis, and the electro-optic modulator is used for changing the polarization direction of laser beam when laser beam output from the high reflector meets preset conditions, so that the laser beam is reflected and output from the polarization reflector to obtain ultra-fast laser beam;
The preset condition is that the single pulse energy of the laser output from the high reflector reaches a preset energy value or the heat generated by the laser in unit time;
wherein the saturated absorber is parallel to the high reflector so as to enable laser to oscillate back and forth between the saturated absorber and the high reflector, and initial light generated by the saturated absorber passes through the laser crystal to generate polarized light with high coherence;
The electro-optic modulator includes: the device comprises a Prkeel box and a high-voltage signal generator, wherein the Prkeel box is arranged on the axis and is arranged between the laser crystal and the polarization reflector, the high-voltage signal generator is used for sending a high-voltage signal to the Prkeel box, and the Prkeel box is used for changing the refractive index of an electro-optic crystal in the box according to the high-voltage signal so as to change the polarization direction of the laser passing through the Prkeel box; the total loss between the saturated absorber and the high reflector is smaller than the gain generated after the laser crystal is pumped by the pumping light;
The electro-optic modulator further comprises: the photoelectric detector is arranged on the axis and is used for detecting the pulse energy of the laser output from the high-reflection mirror, the controller is used for acquiring the pulse energy and driving the high-voltage signal generator to generate a high-voltage signal when the pulse energy reaches a preset value, and the switching time is directly determined by the time of the rising edge and the falling edge of the high-voltage loaded on the electro-optical crystal;
The photoelectric detector is also used for detecting the pulse time of the laser output from the high reflector, and the controller is also used for obtaining the moment of driving the high-voltage signal generator to generate a high-voltage signal according to the pulse time and the cavity length of the ultrafast laser generator and driving the high-voltage signal generator to generate the high-voltage signal at the moment; the laser crystal also comprises a cooling device which is arranged in the heat sink of the laser crystal.
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| CN201810623173.7A CN108683070B (en) | 2018-06-15 | 2018-06-15 | An ultrafast laser generator |
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| CN108683070B true CN108683070B (en) | 2024-11-22 |
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| CN110006828B (en) * | 2019-04-26 | 2021-04-23 | 哈尔滨工业大学 | A device and method for improving the performance of a photoacoustic spectroscopy trace gas sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1423380A (en) * | 2001-11-23 | 2003-06-11 | 中国科学院福建物质结构研究所 | 1.3mum waveband nano second neodymium-doped crystal laser controlled by light path delay wave-absorption method |
| CN2765348Y (en) * | 2005-01-13 | 2006-03-15 | 北京工业大学 | Cavity dumping full-solid picosecond laser |
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| US7929579B2 (en) * | 2006-08-02 | 2011-04-19 | Cynosure, Inc. | Picosecond laser apparatus and methods for its operation and use |
| AT503819B1 (en) * | 2006-08-24 | 2008-01-15 | Ctr Carinthian Tech Res Ag | Impulse energy controlling method for impulse laser, involves assigning Q-switch in form of saturable absorber to laser resonator, where saturable absorber is partially pre-saturated by variable control light source in intensity |
| CN105896259B (en) * | 2014-12-03 | 2019-07-02 | 杜金波 | Q-switch Nd:YAG laser pulse width narrows technology |
| CN104466654A (en) * | 2014-12-29 | 2015-03-25 | 中国科学院半导体研究所 | Pulse pumping passive Q-switched output single pulse laser device |
| CN107482431B (en) * | 2016-06-08 | 2020-05-19 | 中国科学院西安光学精密机械研究所 | Ultrashort laser pulse train selection device and output method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1423380A (en) * | 2001-11-23 | 2003-06-11 | 中国科学院福建物质结构研究所 | 1.3mum waveband nano second neodymium-doped crystal laser controlled by light path delay wave-absorption method |
| CN2765348Y (en) * | 2005-01-13 | 2006-03-15 | 北京工业大学 | Cavity dumping full-solid picosecond laser |
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