CN104880256B - A kind of method and apparatus for testing Terahertz shear wave and compressional wave phase dynamic change - Google Patents
A kind of method and apparatus for testing Terahertz shear wave and compressional wave phase dynamic change Download PDFInfo
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Abstract
The present invention relates to a kind of method and apparatus for testing Terahertz shear wave and compressional wave phase dynamic change, THz wave generation system is passed through with a branch of ultrashort pulse, produce THz wave, terahertz wave signal and another beam ultrashort pulse focus on one and played on zinc telluridse crystal, terahertz signal is detected in diverse location using zinc telluridse crystal, the phase place change of THz wave is observed by this series of terahertz time-domain signal.Selection<110>The zinc telluridse crystal detection Terahertz shear wave composition of crystal orientation, selection<100>The zinc telluridse crystal detection Terahertz compressional wave composition of crystal orientation, the function of test Terahertz shear wave and compressional wave phase dynamic change respectively can be achieved by changing the zinc telluridse crystal of different crystal orientations.Device is simple, easily operation.
Description
Technical field
The present invention relates to phase detection techniques, more particularly to a kind of test Terahertz（THz）Shear wave and compressional wave phase dynamic
The method and apparatus of change.
Background technology
With series of new techniques, the development of new material, the development of particularly ultrafast technology, the stable pulse THz in broadband
Source turns into a kind of quasi- routine techniques, and at home and abroad starts one THz research boom.THz wave is frequency 0.1 to 10
Electromagnetic wave in the range of THz, between microwave is located in electromagnetic spectrum and be infrared, in biological detection, safety detection, the communication technology
There is huge application value etc. scientific domain.
Fluctuate and be divided into shear wave and the class of compressional wave two according to the direction of vibration of particle and the relation of the direction of propagation of ripple.Shear wave,
Claim " concavo-convex ripple ", be characterized in that the direction of vibration of particle and the direction of propagation of ripple are mutually perpendicular to.Shear wave is every in communication process
The place that ripple is passed to, each particle vibrates near the equilbrium position of oneself.Substantially, the propagation of shear wave is due in medium
Detrusion occurs for portion（It is that the relative movement parallel to these layers occurs between each layer of medium）And producing makes volume elements recover former
The shearing elasticity power of shape and realize.
Compressional wave, also known as " dilatational wave ", is characterized in the direction of vibration and the ripple that the direction of propagation is coaxial of particle.The propagation of compressional wave
Process is that the different part of density occur along the direction that wavefront enters.Compressional wave is in communication process, the place that every ripple is passed to, often
Individual particle is all repeatedly vibrated near respective equilbrium position, and ripple is propagated along horizontal direction.Substantially, the propagation of compressional wave is
Because the deformation of compression and stretching occurs for each volume elements in medium, and produce the longitudinal spring force for restoring volume elements and realize
's.
1890, French physician Louis Georges Gouy had found that by the electromagnetic wave of focus one will be obtained
The positive and negative 180 ° of phase shifts in extra axial direction.The discovery of this phase place change, there is important influence to whole electromagnetic spectrum.Gu Yixiang
It is advanced that shifting assumes that Fresnel Huygens small echo explains quadratic phase from a main prewave；In the Gu Yixiang of curved mirror laser cavity
Move the resonant frequency difference for explaining different transverse modes；In nonlinear optics, Gouy phase shift can greatly reduce focusing light
The probability of beam harmonic distortion.In addition, it still results in major reason of the phase velocity more than a plane light wave in a vacuum.
But, if thinking the phase place change of directly observation THz wave, not only need accurate calculating, the regulation of experimental provision
Also it is very cumbersome.A variety of not convenience based on these experimentally, are used to directly test there is presently no succinct experimental provision
The phase dynamic change of Terahertz shear wave and compressional wave.Patent of the present invention proposes a kind of zinc telluridse crystal of utilization different crystal orientations and existed
Diverse location detects terahertz signal, and Terahertz shear wave and compressional wave can be directly observed by this series of terahertz time-domain signal
The method of phase dynamic change, device is simple, easily operation.
The content of the invention
The present invention be directed to can not intuitively observe shear wave and compressional wave phase dynamic change problem at present, it is proposed that one kind is surveyed
The method and apparatus for trying Terahertz shear wave and compressional wave phase dynamic change, are produced with a branch of ultrashort pulse by THz wave
System, produces THz wave, and terahertz wave signal and another beam ultrashort pulse focus on one and played on zinc telluridse crystal, utilize
Zinc telluridse crystal detects terahertz signal in diverse location, and THz wave is observed by this series of terahertz time-domain signal
Phase place change.Wherein, select<110>The zinc telluridse crystal detection Terahertz shear wave composition of crystal orientation, selection<100>The tellurium of crystal orientation
Change zinc crystal detection Terahertz compressional wave composition, i.e., can be achieved to test terahertz respectively by changing the zinc telluridse crystal of different crystal orientations
The hereby function of shear wave and compressional wave phase dynamic change.
The technical scheme is that：A kind of method for testing Terahertz shear wave and compressional wave phase dynamic change, laser light
After the laser pulse that source is sent is by beam splitting chip, reflected light enters THz wave generation system as pump beam and is used to radiate too
Hertz wave, another part transmitted light realizes the detection to THz wave as detection light beam；Reflection laser is pump light through the 5th
Enter THz wave generation system after speculum reflection, the divergent shape THz wave given off becomes after being collected through off axis paraboloidal mirror
Into parallel THz wave, then reflect and focus on zinc telluridse crystal by off axis paraboloidal mirror；Transmission laser is detection
Light sequentially passes through the first speculum, optical delay, the second speculum, the 3rd speculum, the 4th speculum, is then by focusing on
System, is overlapped, and get to simultaneously on zinc telluridse crystal with the THz wave focus focused on through off axis paraboloidal mirror；Detection light beam passes through
It is divided into polarization orthogonal two after the logical prism in the second condenser lens, quarter wave plate and wet Lars is sequentially passed through after zinc telluridse crystal
Shu Guang, two-beam is got on photodiode probe respectively, and the difference of the intensity of photodiode probe is proportional to THz wave
Electric-field intensity；The difference of THz wave time-domain signal can be achieved by scanning the time delayses of pump beam and detection light beam again
Detection；Respectively using passing through<110>With<100>Two pieces of zinc telluridse crystal in crystal orientation face, to separately detect the electricity of shear wave and compressional wave
Field intensity；The position of zinc telluridse crystal, every are moved forward and backward by adjusting one-dimensional motor in THz wave focus antero-posterior extent
Terahertz signal is surveyed every same distance, Terahertz shear wave or compressional wave are observed according to a series of terahertz time-domain signals measured
Phase dynamic change.
The off axis paraboloidal mirror is punching off axis paraboloidal mirror, and focusing system is the first condenser lens, off-axis with punching
Paraboloidal mirror is confocal, and zinc telluridse crystal is positioned at their common focus.
The focusing system includes the first condenser lens, the 6th speculum, silicon chip successively, and detection light is poly- by focusing system
It is burnt on zinc telluridse crystal, overlapped with the THz wave focus focused on through off axis paraboloidal mirror, and get to zinc telluridse crystal simultaneously
On.
The focusing system includes the first condenser lens, the 6th speculum, tin-doped indium oxide film successively, and THz wave leads to
Cross after off axis paraboloidal mirror and tin-doped indium oxide film reflection, focus on zinc telluridse crystal, it is anti-that detection light sequentially passes through first
Mirror, optical delay, the second speculum, the 3rd speculum, the 4th speculum are penetrated, then passes through the focusing of the first condenser lens, the 6th
Speculum is reflected and tin-doped indium oxide film is transmitted on zinc telluridse crystal.
The beneficial effects of the present invention are：The present invention is a kind of side for testing Terahertz shear wave and compressional wave phase dynamic change
Method and device, device are simple, easily operation.In actual mechanical process, it is only necessary to which zinc telluridse crystal is fixed on into one-dimensional motor
On, moving forward and backward the position of zinc telluridse crystal before and after punching off axis paraboloid mirror mirror foci in certain limit by adjusting one-dimensional motor
Put, survey terahertz signal at interval of same distance, Terahertz shear wave is observed according to a series of terahertz time-domain signals measured
Or the phase dynamic change of compressional wave.
Brief description of the drawings
Fig. 1 is present invention test Terahertz shear wave and the structural representation of device embodiment one of compressional wave phase dynamic change；
Fig. 2 is present invention test Terahertz shear wave and the structural representation of device embodiment two of compressional wave phase dynamic change；
Fig. 3 is present invention test Terahertz shear wave and the structural representation of device embodiment three of compressional wave phase dynamic change；
Fig. 4 is present invention test Terahertz shear wave and the structural representation of device embodiment four of compressional wave phase dynamic change.
Embodiment
As Fig. 1 shows for the structure of device embodiment one of present invention realization test Terahertz shear wave and compressional wave phase dynamic change
It is intended to, THz wave is carried out using punching paraboloidal mirror and combiner is detected, implementation, device is by LASER Light Source 1, beam splitting chip
2, the first speculum 3, optical delay 4, the second speculum 5, the 3rd speculum 6, the 4th speculum 7, the first condenser lens 8,
Punching off axis paraboloidal mirror 9, the 5th speculum 10, THz wave generation system 11, off axis paraboloidal mirror 12, one-dimensional motor 13,
Zinc telluridse crystal（ZnTe）14, the second condenser lens 15, quarter wave plate 16, wet Lars leads to prism 17 and photodiode（PD）Visit
First 18 composition.After the laser pulse that LASER Light Source is sent is by beam splitting chip 2, reflection laser is that pump light is anti-through the 5th speculum 10
Enter Terahertz generation system 11 after penetrating, the divergent shape THz wave given off becomes parallel after being collected through off axis paraboloidal mirror 12
THz wave, then by punching off axis paraboloidal mirror 9 reflect and focus on zinc telluridse crystal 14.Transmission laser is detection
Light is sequentially passed through after the first speculum 3, optical delay 4, the second speculum 5, the 3rd speculum 6, the 4th speculum 7 by first
Condenser lens 8 is focused on.First condenser lens 8 and punching off axis paraboloidal mirror 9 are confocal, and zinc telluridse crystal 14 is positioned over theirs
At common focus.Light beam is detected by sequentially passing through the second condenser lens 15, quarter wave plate 16 and Wo Lasi after zinc telluridse crystal 14
It is divided into the orthogonal two-beam of polarization after logical prism 17, two-beam is got on PD probes 18 respectively.According to electro optic sampling principle,
Thus can direct detection to Terahertz time-domain signal.Zinc telluridse crystal 14 is fixed on one-dimensional motor 13, to punch off-axis throwing
Point centered on the focal position of object plane mirror 9, tellurium is being moved forward and backward before and after central point in certain limit by adjusting one-dimensional motor 13
Change the position of zinc crystal 14, survey terahertz signal at interval of same distance, a series of terahertz signal figure is can obtain, so as to see
Measure the dynamic change of its phase.The zinc telluridse crystal 14 of different crystal orientations is changed, Terahertz shear wave and compressional wave can be tested respectively
Phase dynamic change.Crystal orientation is<110>Zinc telluridse crystal can be used for the phase dynamic change for testing Terahertz shear wave, it is brilliant
Xiang Wei<100>Zinc telluridse crystal can test the phase dynamic change of Terahertz compressional wave.
Fig. 2 tests Terahertz shear wave and the structural representation of device embodiment two of compressional wave phase dynamic change for the present invention,
THz wave is carried out using silicon chip and combiner is detected, implementation, device is by LASER Light Source 1, beam splitting chip 2, the first speculum
3, optical delay 4, the second speculum 5, the first condenser lens 8, the 5th speculum 10, THz wave generation system 11,First from
Axis paraboloidal mirror 12, one-dimensional motor 13, zinc telluridse crystal（ZnTe）14, the second condenser lens 15, quarter wave plate 16, wet Lars leads to
Prism 17, photodiode（PD）Probe 18, the 6th speculum 19, the off axis paraboloidal mirror 21 of High Resistivity Si 20 and second is constituted.Swash
After the laser pulse that radiant is sent is by beam splitting chip 2, reflection laser is to enter too after pump light reflects through the 5th speculum 10
Hertz wave generation system 11, the divergent shape THz wave given off through the first off axis paraboloidal mirror 12 collect after become it is parallel too
Hertz wave, then passes through the reflection of the second off axis paraboloidal mirror 21 and focuses on zinc telluridse crystal 14, the middle transmissive of High Resistivity Si 20
Terahertz light.Transmission laser is that detection light sequentially passes through the first speculum 3, optical delay 4, the focusing of the second speculum 5, first thoroughly
Mirror 8, the 6th speculum 19, High Resistivity Si 20 are beaten on zinc telluridse crystal 14 after reflecting.Focused on and second by the first condenser lens 8
Off axis paraboloidal mirror 21 is focused on, and detection light and terahertz light are focused on into same point, and zinc telluridse crystal 14 is positioned over theirs
At common focus.Light beam is detected by sequentially passing through the second condenser lens 15, quarter wave plate 16 and Wo Lasi after zinc telluridse crystal 14
It is divided into the orthogonal two-beam of polarization after logical prism 17, two-beam is got on PD probes 18 respectively.According to electro optic sampling principle,
Thus can direct detection to Terahertz time-domain signal.Zinc telluridse crystal 14 is fixed on one-dimensional motor 13, with the second off-axis throwing
Point centered on the focal position of object plane mirror 21, tellurium is being moved forward and backward before and after central point in certain limit by adjusting one-dimensional motor 13
Change the position of zinc crystal 14, survey terahertz signal at interval of same distance, a series of terahertz signal figure is can obtain, so as to see
Measure the dynamic change of its phase.The zinc telluridse crystal 14 of different crystal orientations is changed, Terahertz shear wave and compressional wave can be tested respectively
Phase dynamic change.Crystal orientation is<110>Zinc telluridse crystal can be used for the phase dynamic change for testing Terahertz shear wave, it is brilliant
Xiang Wei<100>Zinc telluridse crystal can test the phase dynamic change of Terahertz compressional wave.
Fig. 3 tests Terahertz shear wave and the structural representation of device embodiment three of compressional wave phase dynamic change for the present invention,
Using ITO（That is tin-doped indium oxide）Carry out THz wave and detect combiner, implementation, device is by LASER Light Source 1, beam splitting chip
2, the first speculum 3, optical delay 4, the second speculum 5, the first condenser lens 8, the 5th speculum 10, THz wave is produced
System 11,First off axis paraboloidal mirror 12, one-dimensional motor 13, zinc telluridse crystal（ZnTe）14, the ripple of the second condenser lens 15,1/4
Piece 16, wet Lars leads to prism 17, photodiode（PD）Probe 18, the 6th speculum 19, the second off axis paraboloidal mirror 21, ITO
（That is tin-doped indium oxide）Film 22 is constituted.After the laser pulse that LASER Light Source is sent is by beam splitting chip, reflection laser is pump light
Enter THz wave generation system 11 after being reflected through the 5th speculum 10, the divergent shape THz wave given off is through the first off-axis throwing
Object plane mirror 12 becomes parallel THz wave after collecting, and then passes through the second off axis paraboloidal mirror 21 and ITO（Mix tin oxidation
Indium）After film 22 reflects, focus on zinc telluridse crystal 14.Transmission laser is that detection light sequentially passes through the first speculum 3, optics
Postpone to pass through ITO after the 4, second speculum 5, the first condenser lens 8, the 6th speculum 19（That is tin-doped indium oxide）Film 22, leads to
Cross the focusing of the first condenser lens 8 to focus on the second off axis paraboloidal mirror 21, light will be detected and terahertz light focuses on same point, and
Zinc telluridse crystal 14 is positioned at their common focus.Light beam is detected by sequentially passing through the second focusing after zinc telluridse crystal 14
Lens 15, quarter wave plate 16 and wet Lars, which lead to after prism 17, is divided into the orthogonal two-beam of polarization, and two-beam gets to PD spies respectively
On first 18.According to electro optic sampling principle, thus can direct detection to Terahertz time-domain signal.Zinc telluridse crystal 14 is fixed on one
Tie up on motor 13, the point centered on the focal position of the second off axis paraboloidal mirror 21 is passing through before and after central point in certain limit
The position that one-dimensional motor 13 moves forward and backward zinc telluridse crystal 14 is adjusted, terahertz signal is surveyed at interval of same distance, one is can obtain
The terahertz signal figure of series, so as to observe the dynamic change of its phase.The zinc telluridse crystal 14 of different crystal orientations is changed, can be with
The phase dynamic change of Terahertz shear wave and compressional wave is tested respectively.Crystal orientation is<110>Zinc telluridse crystal can be used for test too
The phase dynamic change of hertz shear wave, crystal orientation is<100>Zinc telluridse crystal can test Terahertz compressional wave phase dynamically become
Change.
Test Terahertz shear wave and the structural representation of device embodiment four of compressional wave phase dynamic change, are adopted as shown in Figure 4
THz wave is produced with air ionization, and punching paraboloidal mirror carries out THz wave and detection combiner, implementation.To export
Center wavelength of light is 800 nm laser, exemplified by punching off axis paraboloidal mirror, the implementation one of its all band and the wave band
Cause.
Laser output center wavelength of light is 800 nm, and pulse width is 40 fs, the KHz of repetition rate 1, with air ionization
Produce exemplified by terahertz emission, the process for implementing test Terahertz shear wave and compressional wave phase dynamic change is as follows：By laser
Light source 1, (the beam splitting chip T of beam splitting chip 2:R=1:9), the first speculum 3, optical delay 4, the second speculum 5, the 3rd speculum
6, the 4th speculum 7, the first condenser lens 8（f=300 mm）, punch off axis paraboloidal mirror 9（f=50 mm）, the 5th speculum
10, THz wave generation system 11, off axis paraboloidal mirror 12（f=152.4 mm）, one-dimensional motor 13, zinc telluridse crystal（ZnTe）
Crystal 14, the second condenser lens 15（f=100 mm）, quarter wave plate 16, wet Lars leads to prism 17 and photodiode（PD）Probe
18 compositions.After the laser pulse that LASER Light Source 1 is sent is by beam splitting chip 2, reflection laser is that pump light is anti-through the 5th speculum 10
Enter Terahertz generation system 11 after penetrating, ionized air formation plasma filament after being focused on through lens 11 (1) (f=150 mm),
So as to form the THz wave of taper radiation.Divergent shape THz wave through off axis paraboloidal mirror 12 collect after become it is parallel too
Hertz wave, then reflects and focuses on zinc telluridse crystal 14 by punching off axis paraboloidal mirror 9.Transmission laser be detection light according to
It is secondary to be focused on after the first speculum 3, optical delay 4, the second speculum 5, the 3rd speculum 6, the 4th speculum 7 by first
Lens 8 are focused on.First condenser lens 8 and punching off axis paraboloidal mirror 9 are confocal, and zinc telluridse crystal 14 is positioned over the common of them
Focal point.Detection light beam leads to rib by sequentially passing through the second condenser lens 15, quarter wave plate 16 and wet Lars after zinc telluridse crystal 14
It is divided into the orthogonal two-beam of polarization after mirror 17, two-beam is got on PD probes 18 respectively.According to electro optic sampling principle, thus
Can direct detection to Terahertz time-domain signal.Using the THz wave of air plasma body method generation as the taper of radial polarisation
Radiation, after the THz wave of this polarization mode is focused on through short focus（Such as punching off axis paraboloidal mirror 9 in the embodiment（f
=50 mm））Part compressional wave composition can be produced.When detecting Terahertz shear wave composition, it is from crystal orientation<110>, it is long 10 mm, wide by 10
Mm, thick 0.5 mm zinc telluridse crystal, during detection Terahertz compressional wave composition, be from crystal orientation<100>, long 10 mm, wide 10 mm,
0.5 mm of thickness zinc telluridse crystal.Zinc telluridse crystal 14 is fixed on one-dimensional motor 13, to punch the focus of off axis paraboloidal mirror 9
Point centered on position, is moving forward and backward the position of zinc telluridse crystal 14 by adjusting one-dimensional motor 13 in certain limit before and after central point
Put, survey terahertz signal at interval of same distance, a series of terahertz signal figure is can obtain, so as to observe Terahertz shear wave
Or the phase dynamic change of compressional wave.
Claims (1)
1. a kind of method for testing Terahertz shear wave and compressional wave phase dynamic change, it is characterised in that what LASER Light Source was sent swashs
After light pulse is by beam splitting chip, reflected light enters THz wave generation system as pump beam and is used to radiate THz wave, separately
A part of transmitted light realizes the detection to THz wave as detection light beam；Reflection laser is that pump light reflects through the 5th speculum
Afterwards enter THz wave generation system, the divergent shape THz wave given off become after being collected through off axis paraboloidal mirror it is parallel too
Hertz wave, then reflects and focuses on zinc telluridse crystal by off axis paraboloidal mirror；Transmission laser is that detection light is sequentially passed through
First speculum, optical delay, the second speculum, the 3rd speculum, the 4th speculum, then by focusing system, with through from
The THz wave focus that axis paraboloidal mirror is focused on is overlapped, and is got to simultaneously on zinc telluridse crystal；Detect light beam brilliant by zinc telluridse
It is divided into the orthogonal two-beam of polarization, two beams after the logical prism in the second condenser lens, quarter wave plate and wet Lars is sequentially passed through after body
Light is got on photodiode probe respectively, and the difference of the intensity of photodiode probe is proportional to the electric-field intensity of THz wave；
The difference detecting of THz wave time-domain signal can be achieved by scanning the time delayses of pump beam and detection light beam again；Pass through
Use respectively<110>With<100>Two pieces of zinc telluridse crystal in crystal orientation face, to separately detect the electric-field intensity of shear wave and compressional wave；
The position of zinc telluridse crystal is moved forward and backward in THz wave focus antero-posterior extent by adjusting one-dimensional motor, at interval of same distance
Terahertz signal is surveyed, is dynamically become according to the phase that a series of terahertz time-domain signals measured observe Terahertz shear wave or compressional wave
Change.
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| CN103557949A (en) * | 2013-10-31 | 2014-02-05 | 武汉科技大学 | Method for generating and detecting terahertz pulses in real time |
| CN104390935A (en) * | 2014-12-10 | 2015-03-04 | 上海理工大学 | Device and method for testing nonlinear polarization coefficient and absorption coefficient at terahertz band |
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