CN103022881A - Device and method for generating triple-frequency laser - Google Patents
Device and method for generating triple-frequency laser Download PDFInfo
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- CN103022881A CN103022881A CN2012105584289A CN201210558428A CN103022881A CN 103022881 A CN103022881 A CN 103022881A CN 2012105584289 A CN2012105584289 A CN 2012105584289A CN 201210558428 A CN201210558428 A CN 201210558428A CN 103022881 A CN103022881 A CN 103022881A
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Abstract
The invention discloses a device for generating a triple-frequency laser. The device comprises a polarization beam splitting crystal, a first block acousto-optic crystal, a second block acousto-optic crystal, an optical delay wave plate and a plane mirror 11, wherein horizontally polarized light of an incident laser which is subjected to splitting by the polarization beam splitting crystal passes through the first block acousto-optic crystal and the second block acousto-optic crystal sequentially, horizontally polarized light which passes through the second block acousto-optic crystal is reflected by the plane mirror after passing through the optical delay wave plate, reflecting light passes through the optical delay wave plate, the second block acousto-optic crystal and the first block acousto-optic crystal sequentially, and frequency shift or non-frequency shift is conducted on the laser projected to the first block acousto-optic crystal and the second block acousto-optic crystal through controlling of the first block acousto-optic crystal and the second block acousto-optic crystal, so that the triple-frequency laser is generated.
Description
Technical field
The present invention relates to laser multifrequency production method, relate in particular to a kind of multifrequency laser generator and method of sodium thermometric anemometry laser radar.
Background technology
What the acoustooptic modulation technology was mainly utilized is the basic principle of acousto-optic interaction, realizes the purpose of laser frequency frequency displacement.Acoustooptical effect be sound wave when Propagation, make medium produce elastic deformation, cause that the density of medium is being alternately distributed of density interphase, cause the variation of medium refraction index.When light is subject to the medium of acoustic disturbance by this, will produce diffraction phenomena.When light passes acousto-optic modulator with different angles, can produce two kinds of multi-form diffraction, a kind of is Raman-Na Si diffraction, a kind of is Bragg diffraction.In acousto-optic medium when light wave propagation direction and ultrasonic propagation direction perpendicular, and wave length of sound is longer, the distance of light wave and sound wave interaction the multi-level diffraction light spectrum occurs on central bright spot bilateral symmetry ground more in short-term simultaneously, and this phenomenon is called Raman-Na Si diffraction.Raman is received this diffraction and is only limited to low frequency operation, and bandwidth is less.When light wave is mapped in the acousto-optic medium so that Prague incidence angle is oblique, ultrasonic frequency is higher, and acousto-optic interaction length is larger, produces asymmetric diffraction light, has the phenomenon of zero level and one-level (positive one-level or negative one-level) diffraction light, is called Bragg diffraction.The Bragg diffraction frequency of sound wave is higher, and the acousto-optic interaction distance is with roomy.In theory, it is 33.9% that Raman is received the maximal efficiency of this diffraction, and the efficient of Bragg diffraction can reach 100%.So practical devices adopts Bragg diffraction more.Acousto-optical device generally is comprised of acousto-optic medium, PZT (piezoelectric transducer) and sound-absorbing material.Acousto-optic medium is the interactional medium of sound wave and light wave.The effect of sound-absorbing material is to absorb to propagate into the ultrasonic wave of end face to set up ultrasonic travelling wave by medium.The end face of medium is worn into the inclined-plane or become the ox horn shape, can reach equally the effect of sound absorption.PZT (piezoelectric transducer) claims again ultrasonic generator, is made by girl's acid crystalline lithium or other piezoelectric.Its effect is to change electrical power into acoustical power, and sets up ultrasonic field in acousto-optic medium.When incident light enters to inject acousto-optic medium with Prague incidence angle, will interact with ultrasonic wave, the frequency of light wave produces frequency displacement up or down, thereby can produce the purpose of frequency shift light.
In sodium thermometric anemometry laser radar system, measure when realizing the atmospheric temperature in zone, top, intermediate layer (80-105km) and wind field, need to launch simultaneously the laser of three kinds of frequencies, sodium atom spectral line D2a core frequency v in the atmosphere
0, and two flank frequency v
0+ f and v
0-f.The exportable single-frequency v of laser
0Laser.The laser of two flank frequencies can't be by laser output itself.
Summary of the invention
The technical problem that (one) will solve
The main technical problem to be solved in the present invention is: the three-frequency excitation photogenerator that a kind of same light path outgoing is provided.Solve sodium thermometric anemometry laser radar system three frequency laser demands.
(2) technical scheme
For addressing the above problem, the invention discloses a kind of three-frequency excitation light generating device, it comprises: polarization beam splitting crystal, first block of acousto-optic crystal, second acousto-optic crystal, optical time delay wave plate and plane mirror 11; The horizontal polarization light that incident laser obtains after by the beam splitting of described polarization beam splitting crystal is successively by first block of acousto-optic crystal and second block of acousto-optic crystal, and behind the described optical time delay wave plate of horizontal polarization light process by described second block of acousto-optic crystal, reflect through plane mirror again, reverberation is more successively by optical time delay wave plate, second block of acousto-optic crystal, first block of acousto-optic crystal, wherein, by controlling described first block of acousto-optic crystal and second block of acousto-optic crystal carries out frequency displacement or not frequency displacement to the laser that incides it, and then produce three-frequency excitation light.
The invention also discloses a kind of three-frequency excitation light production method, the method comprises:
Incident laser is carried out beam splitting by the polarization beam splitting crystal, obtain horizontal polarization light;
Horizontal polarization light is exported through first block of acousto-optic crystal;
The light of described first block of acousto-optic crystal output is exported through second block of acousto-optic crystal;
With the light of described second block of acousto-optic crystal output through the output of optical time delay wave plate, and through the plane mirror reflection, then successively by described optical time delay wave plate, second block of acousto-optic crystal, first block of acousto-optic crystal and polarization beam splitting crystal;
Wherein, by controlling described first block of acousto-optic crystal and second block of acousto-optic crystal carries out frequency displacement or not frequency displacement to the laser that incides it, and then produce three-frequency excitation light.
(3) beneficial effect
Advantage of the present invention and effect are: adopt the solid acousto-optic crystal device that frequently drives, can realize the precise and stable frequency shift of laser frequency, by controlling the different operating state of two crystal, can produce three frequency laser.The structural design that adopts multidimensional to adjust can conveniently realize optimizing and revising of luminous power.Introduce the optical time delay wave plate, polarizer adopts unique light channel structure and design and optical chopper, can realize that three frequency laser are along the outgoing of same light path sequence.
Description of drawings
Fig. 1 is the structural representation of three-frequency excitation optical generator disclosed by the invention;
Fig. 2 is the control sequential chart of three-frequency excitation optical generator among the present invention;
Fig. 3 is the structural representation of chopper disc among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, the three-frequency excitation optical generator comprises: first aperture 1, polarization beam splitting crystal 2,4, the first blocks of acousto-optic crystals 5 of 3, the first lens of second aperture, 6, the second blocks of acousto-optic crystals 7 of compound lens, optical time delay wave plate 8, second lens 9, optical chopper 10, plane mirror 11, optical chopper controller 12, acousto-optic crystal power supply driver 13, time schedule controller 14 and signal synchronizer 15.Said polarization beam splitting crystal is fixed on the two-dimentional adjustment rack, and two-dimentional adjustment rack integral body is fixed in the XOZ plane the adjustable support bar of incline direction in the incline direction and YOZ plane.Said first block of acousto-optic crystal, second block of acousto-optic crystal is fixed in X-direction, Y direction, Z-direction, the XOY plane in rotation, the XOZ plane in the incline direction and YOZ plane on the common adjustable combined bay of six direction of incline direction, and every block of acousto-optic crystal is all supporting that the solid frequency power driver of controlling with Transistor-Transistor Logic level arranged.Said compound lens, second lens are fixed in X-axis, Y-axis and Z axis on the adjustable combined bay of totally three directions.Said optical chopper is fixed on the adjustable one dimension translation stage of X-direction (wherein X-axis is optical axis direction perpendicular to optical axis, Y-axis in the horizontal direction, Z axis at vertical direction perpendicular to optical axis).
Described acousto-optic crystal power supply driver is according to the TTL pulse signal modulation output RF pulse signal of input, the RF pulse signal that described three-frequency excitation optical generator is exported by the described acousto-optic crystal power supply driver of controlling two blocks of acousto-optic crystals comes the operating state of guide sound luminescent crystal, thereby the variation of control laser frequency, the laser of three frequencies of acquisition.When the TTL of the power supply driver that is input to two blocks of acousto-optic crystals pulse signal all was low level, exportable frequency was v
0Laser; When the TTL of the power supply driver of first block of acousto-optic crystal is input as high level, and the TTL of the power supply driver of second block of acousto-optic crystal is input as low level, and exportable frequency is v
0The laser of+f; When the TTL of the power supply driver of first block of acousto-optic crystal is input as low level, and the TTL of the power supply driver of second block of acousto-optic crystal is input as high level, and exportable frequency is v
0The laser of-f;
Embodiment is referring to Fig. 1.The continuous laser of incident is by the beam splitting of polarization beam splitting crystal 2, wherein S composition (perpendicular to the plane of incidence) will be reflected, most of P composition (being parallel to the plane of incidence) sees through, thereby become light splitting so that transmitted light is P, so that the S perpendicular to the plane of incidence that returns through the aftermentioned device becomes light splitting to reflect away.Transmitted light (horizontal polarization light) focuses on first block of acousto-optic crystal 5 by first lens 4, focuses on second block of acousto-optic crystal 7 through compound lens 6 again.Then through optical time delay wave plate 8, again by second lens, 9 collimations, disc hole slot through optical chopper 10, by plane mirror 11 reflections, the light of reflection arrives optical time delay wave plate 8 through disc hole slot and second lens 9 of optical chopper 10 again, horizontal polarization light becomes circularly polarized light during for the first time by optical time delay wave plate 8, the circularly polarized light that returns is again by optical time delay wave plate 8, become the orthogonal polarized light perpendicular to the plane of incidence, this orthogonal polarized light is successively through second block of acousto-optic crystal 7, compound lens 6, first block of acousto-optic crystal 5, first lens 4, arrive the polarization beam splitting crystal 2, because this time is the polarised light perpendicular to the plane of incidence, will be reflected away at beam splitting crystal light splitting surface.In the front and back of polarization beam splitting crystal 2 two first aperture 1 and second apertures 3 that the aperture is adjustable are installed, its objective is for adjusting more easily light path.Wherein first block of acousto-optic crystal 5 is installed in the focus place of first lens 4, and the particular location adjustment can be adjusted by the adjustable combination mirror holder of six direction.The position of compound lens 6 and first lens 4 are about first acousto-optic crystal 5 symmetry, second block of acousto-optic crystal 7 is installed in the focus place of compound lens 6, second lens 9 is installed in so that the focus of back light drops on second block of acousto-optic crystal 7, optical time delay wave plate 8 is installed between second block of acousto-optic crystal 7 and second lens 9, optical chopper 10 is tried one's best near its position (not hindering machinery to adjust structure gets final product) after being installed in second lens 9, and plane mirror 11 is tried one's best near its position (not hindering machinery to adjust structure gets final product) after being installed in optical chopper.The optical axis of first block of acousto-optic crystal 5 and incident light optical axis included angle are Prague incidence angle, and the optical axis of second block of acousto-optic crystal 7 and incident light optical axis included angle are negative Prague incidence angle.
The operating state of acousto-optic crystal (5 or 7) is by the Transistor-Transistor Logic level pulse signal control of the TTL modulation port input of its supporting power supply driver 13.Need when applying the TTL high level signal, laser with Prague incidence angle incident will be exported Bragg diffraction light after the acousto-optic crystal effect, ideally only export 0 grade and 1 grade of (or-1 grade) diffraction light, 1 grade of (or-1 grade) diffraction light generation frequency displacement f/2 of output (or-f/2), the angle of output light will change, its separation angle with respect to incident light is two times of Prague incidence angles, and frequency displacement does not occur in 0 grade of light, angle is constant, wherein 0 grade of luminous intensity is very weak, and 1 grade of (or-1 grade) luminous intensity is stronger.When back light passes through acousto-optic crystal again, will again produce frequency displacement f/2 (or-f/2), total frequency displacement be f (namely-f).When projection harmony direction of wave travel was opposite on the sound wave axis of orientation in acousto-optic crystal in the direction of propagation of light, frequency displacement was f, and direction when consistent frequency displacement be-f.The present invention utilizes the frequency shift property of 1 grade of (or-1 grade) diffraction light of acousto-optic crystal device.
With reference to Fig. 2, lower mask body is introduced the specific works situation of three-frequency excitation optical generator.TTL pulse signal 201 is synchronizing signals of time schedule controller 14 outputs, is used for synchronous optical chopper 10, and it inputs to signal synchronizer 15.Pulse signal 202 is signals of optical chopper 10 outputs, and for synchronous with TTL pulse signal 201, it inputs to signal synchronizer 15 equally.Whether the pulse signal 203 of time schedule controller 14 outputs is connected to the TTL modulation port of acousto-optic crystal power supply driver 13 for the interface of first block of acousto-optic crystal 5 of control, be used for this first block of acousto-optic crystal of control and work.Whether the pulse signal 204 of time schedule controller 14 outputs is connected to the TTL modulation port of acousto-optic crystal power supply driver 13 for the interface of second block of acousto-optic crystal 7 of control, be used for this second block of acousto-optic crystal of control and work.205 expressions be the light pulse signal of three-frequency excitation optical generator output.In first pulse period T1, the pulse signal 203 and 204 level that impose on first block of acousto-optic crystal 5 and second block of acousto-optic crystal 7 are low level, namely at first pulse period T1, two blocks of acousto-optic crystals are not modulated laser frequency, and the laser frequency of three-frequency excitation optical generator output is v
0At second pulse period T2, impose on first block of acousto-optic crystal, 5 pulse signals 203 and be low level, the pulse signal 204 that imposes on second block of acousto-optic crystal 7 is high level, first block of acousto-optic crystal 5 do not modulated laser frequency, second block of acousto-optic crystal 7 makes progress frequency shift laser frequency f/2 (namely+f/2), because twice the laser frequency of acoustooptic modulation system output is v by second block of acousto-optic crystal 7
0+ f.In the 3rd pulse period T3, impose on first block of acousto-optic crystal, 5 pulse signals 203 and be high level, impose on second block of acousto-optic crystal, 7 pulse signals 204 and be low level, first acousto-optic crystal 5 downward frequency shift laser frequency f/2 (namely-f/2), second block of acousto-optic crystal 7 do not modulated laser frequency, pass through first block of acousto-optic crystal 5 same twice, the laser frequency of acoustooptic modulation system output is v
0-f.This three-frequency excitation optical generator is finally exported the alternate sequence output of light, and it sequentially is v
0, v
0+ f and v
0-f.
Fig. 3 is the structural representation of optical chopper 10 chopping the light discs.This disc is fixed on the drive motors of optical chopper, controls its rotating speed and phase places by the synchronizing signal 201 of time schedule controller output by optical chopper controller 12.When synchronizing signal 201 and pulse signal 202 Complete Synchronization, optical chopper is with constant rotational speed work.When synchronizing signal 201 and pulse signal 202 synchronously the time, the signal synchronizer makes it synchronous the output calibration signal.And the phase place of synchronizing signal 201 and pulse signal 202 can be arranged by the signal synchronizer, and it is used for the hole slot position of control optical chopper 10 chopping the light discs and treats by the frequency laser sequence consensus.When being in first pulse period T1, acousto-optic crystal 5 and acousto-optic crystal 7 do not produce frequency displacement, and the propagation angle of light do not change yet, and it is v that hole slot 301 is used for by frequency
0Laser.When being in second pulse period T2, acousto-optic crystal 7 work, it will export 0 grade of light of Bragg diffraction light and 1 order diffraction light, 1 order diffraction optic angle degree changes, toward the deflection of disc center, hole slot 302 is used for by 1 order diffraction light, and remaining 0 order diffraction light is blocked by disc.When being in the 3rd pulse period T3, acousto-optic crystal 5 work, it will export 0 grade of light of Bragg diffraction light and-1 order diffraction light,-1 order diffraction optic angle degree changes, toward the deflection of disc center, hole slot 303 is used for-1 order diffraction light, and remaining 0 order diffraction light is blocked by disc.Hole slot 304 is used for output pulse signal 202, and it inputs to signal synchronizer 15, to carry out synchronously with the synchronizing signal 201 of time schedule controller output.The hole slot of disc mid portion and round mouth 305 are used for disc is fixed on drive motors.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. three-frequency excitation light generating device, it comprises: polarization beam splitting crystal, first block of acousto-optic crystal, second acousto-optic crystal, optical time delay wave plate and plane mirror 11; The horizontal polarization light that incident laser obtains after by the beam splitting of described polarization beam splitting crystal is successively by first block of acousto-optic crystal and second block of acousto-optic crystal, and behind the described optical time delay wave plate of horizontal polarization light process by described second block of acousto-optic crystal, reflect through plane mirror again, reverberation is more successively by optical time delay wave plate, second block of acousto-optic crystal, first block of acousto-optic crystal, wherein, by controlling described first block of acousto-optic crystal and second block of acousto-optic crystal carries out frequency displacement or not frequency displacement to the laser that incides it, and then produce three-frequency excitation light.
2. device as claimed in claim 1, it is characterized in that, wherein said device also comprises the acousto-optic crystal power supply driver, described acousto-optic crystal power supply driver is used to acousto-optic crystal that RF pulse signal according to the TTL pulse signal modulation is provided, when the TTL pulse signal that inputs to power supply driver is high level, described acousto-optic crystal modulated laser frequency makes it that frequency displacement occur, and when the TTL pulse signal that inputs to power supply driver was low level, described acousto-optic crystal was not modulated laser frequency.
3. device as claimed in claim 1, it is characterized in that, at the first pulse period (T1), the TTL pulse signal that imposes on the power supply driver of first block of acousto-optic crystal and second block of acousto-optic crystal is low level, described first block of acousto-optic crystal and second block of acousto-optic crystal are not modulated laser frequency, and the laser frequency of described device output is v
0At the second pulse period (T2), the TTL pulse signal that imposes on the power supply driver of first block of acousto-optic crystal is low level, the TTL pulse signal that imposes on the power supply driver of second block of acousto-optic crystal is high level, described first block of acousto-optic crystal do not modulated laser frequency, described second block of acousto-optic crystal frequency shift laser frequency f/2 that make progress, twice the laser frequency of described device output is v behind described second block of acousto-optic crystal
0+ f; At the 3rd pulse period (T3), the TTL pulse signal that imposes on the power supply driver of first block of acousto-optic crystal is high level, the TTL pulse signal that imposes on the power supply driver of second block of acousto-optic crystal is low level, the downward frequency shift laser frequency f of described first block of acousto-optic crystal/2, described second block of acousto-optic crystal do not modulated laser frequency, twice the laser frequency of described device output is v behind described second block of acousto-optic crystal
0-f.
4. device as claimed in claim 1, it is characterized in that, described device also comprises first lens, second lens and compound lens, described first lens are used for horizontal polarization light is focused on described first block of acousto-optic crystal, described compound lens is used for the light of first acousto-optic crystal output is focused on second block of acousto-optic crystal, and described second lens are used for focusing on through the light of described optical time delay wave plate second block of acousto-optic crystal.
5. device as claimed in claim 1, it is characterized in that, described optical time delay wave plate is used for making the horizontal polarization light of incident become circularly polarized light, and the circularly polarized light that returns through plane mirror again by the time become orthogonal polarized light, after described orthogonal polarized light arrived described polarization beam splitting crystal, the light splitting surface that is polarized the beam splitting crystal reflected away.
6. device as claimed in claim 5 is characterized in that, described device also comprises optical chopper, its be used for will described three frequency laser in order sequence pass through, sequence is passed through to be controlled by the chopping the light disc.
7. device as claimed in claim 6 is characterized in that, described optical chopper comprises the chopping the light disc, and this disc comprises three hole slots, by rotating speed and the phase place of controlling described disc, so that when the first pulse period (T1), frequency is v
0Laser by first hole slot (301), when the second pulse period (T2), frequency is v
0The laser of+f is by second hole slot (302), and when the 3rd pulse period (T3), frequency is v
0The laser of-f is by the 3rd hole slot (303).
8. device as claimed in claim 1 is characterized in that, this device also comprises two the first aperture and second orifices that the aperture is adjustable; Described the first aperture and second orifice are installed in respectively the both sides, front and back of light beam crystal, are used for adjusting light path.
9. device as claimed in claim 6, it is characterized in that, this device also comprises time schedule controller and signal synchronizer, and described time schedule controller is used for the power supply driver output TTL pulse signal to described two blocks of acousto-optic crystals, and output is used for the synchronizing signal of synchronous optical chopper; Described signal synchronizer is used for the synchronizing signal of synchronous described time schedule controller output and the synchronizing signal of described optical chopper output.
10. three-frequency excitation light production method, the method comprises:
Incident laser is carried out beam splitting by the polarization beam splitting crystal, obtain horizontal polarization light;
Horizontal polarization light is exported through first block of acousto-optic crystal;
The light of described first block of acousto-optic crystal output is exported through second block of acousto-optic crystal;
With the light of described second block of acousto-optic crystal output through the output of optical time delay wave plate, and through the plane mirror reflection, then successively by described optical time delay wave plate, second block of acousto-optic crystal, first block of acousto-optic crystal and polarization beam splitting crystal;
Wherein, by controlling described first block of acousto-optic crystal and second block of acousto-optic crystal carries out frequency displacement or not frequency displacement to the laser that incides it, and then produce three-frequency excitation light.
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| CN2012105584289A CN103022881A (en) | 2012-12-20 | 2012-12-20 | Device and method for generating triple-frequency laser |
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| CN2012105584289A CN103022881A (en) | 2012-12-20 | 2012-12-20 | Device and method for generating triple-frequency laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605219A (en) * | 2013-08-22 | 2014-02-26 | 中国科学院武汉物理与数学研究所 | Acoustic-optical modulation device capable of outputting three various wavelengths |
| CN106772320A (en) * | 2017-03-10 | 2017-05-31 | 中国科学技术大学 | A kind of first successive step vertical means of the transmitting beam direction of laser radar |
| CN108761755A (en) * | 2018-05-28 | 2018-11-06 | 西北大学 | A kind of stimulated radiation loss microscopic system and its control method |
| CN115508864A (en) * | 2022-09-06 | 2022-12-23 | 中国科学院国家空间科学中心 | E-F area wind-temperature-density metal ion detection laser radar and detection method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605219A (en) * | 2013-08-22 | 2014-02-26 | 中国科学院武汉物理与数学研究所 | Acoustic-optical modulation device capable of outputting three various wavelengths |
| CN103605219B (en) * | 2013-08-22 | 2016-05-18 | 中国科学院武汉物理与数学研究所 | A kind of acousto-optical modulating device that can export three kinds of wavelength |
| CN106772320A (en) * | 2017-03-10 | 2017-05-31 | 中国科学技术大学 | A kind of first successive step vertical means of the transmitting beam direction of laser radar |
| CN106772320B (en) * | 2017-03-10 | 2023-06-16 | 中国科学技术大学 | Laser radar's emission beam direction preliminary adjustment perpendicular arrangement |
| CN108761755A (en) * | 2018-05-28 | 2018-11-06 | 西北大学 | A kind of stimulated radiation loss microscopic system and its control method |
| CN115508864A (en) * | 2022-09-06 | 2022-12-23 | 中国科学院国家空间科学中心 | E-F area wind-temperature-density metal ion detection laser radar and detection method thereof |
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Application publication date: 20130403 |