CN204481321U - The frequency regulator of optical pumping gas THz laser output is stablized based on optoacoustic effect - Google Patents
The frequency regulator of optical pumping gas THz laser output is stablized based on optoacoustic effect Download PDFInfo
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- CN204481321U CN204481321U CN201520241121.5U CN201520241121U CN204481321U CN 204481321 U CN204481321 U CN 204481321U CN 201520241121 U CN201520241121 U CN 201520241121U CN 204481321 U CN204481321 U CN 204481321U
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Abstract
The utility model relates to a kind of frequency regulator stablizing the output of optical pumping gas THz laser based on optoacoustic effect, belongs to THz field of laser device technology.This device adds an optoacoustic detection device on THz laser basis; The photoacoustic signal that its operation material absorptive pumping laser produces is detected with the optoacoustic detection device added; By the situation of change of photoacoustic signal, utilize computer-driven feedback control system to control the piezoelectric ceramic in pump laser and THz laser chamber, to regulate the chamber of pump laser source and THz laser resonant cavity long, thus realize the stable of pump laser source Output of laser, and then realize the stable of THz laser output power and output frequency.The utility model frequency regulator can make optical pumping gas THz laser output power and frequency have higher precision frequency stabilization, faster response speed, is particularly suitable for optical pumping gas THz laser system.
Description
Technical field:
The utility model belongs to Terahertz (THz) field of laser device technology, is specifically related to a kind of frequency regulator realizing stable optical pumping gas THz laser output power and frequency based on optoacoustic effect.
Background technology:
THz wave refers to that frequency is the electromagnetic radiation (1THz-1012GHz) of 100GHz--10THz, because Terahertz is in position special in electromagnetic wave band, with the electromagnetic wave phase of other wave band than the performance with many uniquenesses, as instantaneity, low energy, broadband property, the extremely strong penetration power of apolar substance etc., THz ripple is all widely used in biomedical sector, national defense and military communication, safety check Non-Destructive Testing etc. at present.The research of nearly ten years shows that it has very important science and using value, makes each state in the whole world all give great concern, active development THz technology and application thereof.
In many applications such as terahertz imaging, radar detection, coherent communication, the stability of thz laser device power output and output frequency is the key index affecting its application performance always.
Optical pumping Terahertz (THz) radiation source applies comparatively ripe one in current all kinds of terahertz emission source, its general principle is the Output of laser pumping operation material with a middle infrared laser, because the energy level transition frequency of operation material is in THz wave segment limit, thus THz wave stimulated radiation can be formed.By selecting suitable operation material, finding new energy level transition spectral line, can substantially cover whole terahertz wave band.But also there is power output and the poor problem of frequency stability in optical pumping terahertz emission source, causes its application performance to be affected.In order to realize the high stability of gas Terahertz power output and frequency, first will guarantee that the output frequency of pumping source is stabilized in the absworption peak place of gas THz source gas working dielectric.At present, method and the device of stablizing pumping source output frequency are more, as Lamb dip frequency stabilization method, phase-modulation optical heterodyne frequency stabilizing method, optoacoustic frequency stabilizing method etc.Wherein, described Lamb dip frequency stabilization is the hole burning effect utilizing inhomogeneous broadening linear gain curve, realizes frequency stabilization using gain curve centre frequency as with reference to standard frequency; Although the frequency regulator of this method is fairly simple, there is certain limitation in the application, frequency reproducibility is poor.Described phase-modulation optical heterodyne frequency stabilizing method be utilize the resonance frequency of optical resonator as reference frequency, but its apparatus structure is complicated, and Fabry-Perot (F-P) chamber tool is easy to by external action; Thus its application is also restricted.Described optoacoustic frequency stabilization is the optoacoustic effect based on gas, pumping source is made to be operated in the maximum absorption band place of optoacoustic sample gas, traditional optoacoustic detection be use one independently optoacoustic closed chamber detect, radiationless transition is there is after GAS ABSORPTION luminous energy in its optoacoustic closed chamber, the temperature of absorbing medium is caused to raise, thus cause optoacoustic closed chamber internal gas pressure to change, and then produce acoustic vibration; When there is frequency drift in pump light, the sound pressure signal producing acoustic vibration can change, can be detected the frequency stability of pump light and frequency drift thereof etc. by the change detecting sound pressure signal, and long by the chamber of FEEDBACK CONTROL laser, i.e. Absorbable organic halogens pump laser power output and frequency.
Summary of the invention:
The purpose of this utility model is to overcome defect existing in prior art and deficiency, provides a kind of frequency regulator realizing stable optical pumping gas THz laser output power and frequency based on optoacoustic effect.This device can the significantly power output of the pumping source of stabilizing gas THz laser and frequency, and indicate the absworption peak position of working gas in pump laser frequency and THz laser resonant cavity whether to be in optimum Match, to realize the stable of optical pumping gas THz laser output power and output frequency.And then make optical pumping gas THz laser output power and output frequency have higher precision frequency stabilization, faster response speed, and be more suitable for optical pumping gas THz laser system.
For achieving the above object, the technical scheme that the utility model adopts following technical measures to form realizes.
The basic ideas of the utility model design are: propose by adding an optoacoustic detection device on the basis of optical pumping gas THz laser; The photoacoustic signal that its working gas absorptive pumping laser produces is detected with the optoacoustic detection device added, and then according to the situation of change of photoacoustic signal; Utilize the piezoelectric ceramic (PZT) in feedback control system control pump laser and THz laser chamber, to regulate the chamber of pump laser and THz resonant cavity long, thus realize the stable of pump laser Output of laser, make the absworption peak position of pump laser frequency and THz laser works gas be in optimum Match state; And then raising pumping efficiency, and obtain THz laser output power and the output frequency of high stable.Traditional PA cell and THz resonant cavity unite two into one by the utility model, not only simplify experimental provision, and frequency stabilization are effective.
What the utility model proposes stablizes optical pumping gas THz laser output frequency regulator based on optoacoustic effect, comprise pump laser, Infrared Detectors, THz resonant cavity, THz power meter, beam splitter, optoacoustic detection device, laser power supply, the feedback control system be made up of lock-in amplifier, a PZT driver, the 2nd PZT driver and computer; Wherein, described THz resonant cavity comprises ZnSe window, a PZT, the gold-plated total reflective mirror of concave surface, and THz laser output mirror, takes out inflatable interface; Described pump laser resonant cavity comprises grating, the first total reflective mirror and the second total reflective mirror, the 2nd PZT, outgoing mirror;
The laser that described pump laser exports is divided into two-way by beam splitter, and a road impinges perpendicularly on Infrared Detectors, and another road then enters in THz resonant cavity; In THz resonant cavity, the holding wire of optoacoustic detection device is connected with the signalling channel of lock-in amplifier in feedback control system; The signal output part of lock-in amplifier is connected with computer by holding wire; Computer also connects a PZT driver and the 2nd PZT driver respectively in order to control a PZT and the 2nd PZT respectively.
In such scheme, described optoacoustic detection device adopts optoacoustic inducing function material or microphone to carry out photoacoustic signal detection, described microphone comprises silicon micro-capacitive microphone or silicon micro piezoelectric formula microphone or cantilever type microphone, or ultrasound piezoelectric ceramic microphone carries out photoacoustic signal detection.
In such scheme, described pump laser adopts the RF excited plate waveguide CO of Z-type refrative cavity
2laser, its laser power supply adopts radio-frequency power supply as working power.
In such scheme, in described pump laser resonant cavity, the 2nd PZT is long to change its chamber by the 2nd PZT driver drives in feedback control system, and grating-selected by pump laser resonant cavity.
In such scheme, described THz resonant cavity adopts flat-recessed resonant cavity, and pumping laser input adopts Small aperture coupling input mode, and namely adopt a gold-plated total reflective mirror of the foraminate concave surface in centre, the first piezoelectric ceramic is placed at its back side.
In such scheme, described THz laser output mirror adopts CO
2laser high anti-and to THz laser part through level crossing.
In such scheme, described optoacoustic detection device adopts silicon micro-capacitive microphone; And be placed on the centre position of THz resonant cavity, for detecting the acoustical signal in THz resonant cavity; And make silicon micro-capacitive microphone opening concordant with THz resonant cavity tube wall, to improve the Effect on Detecting of photoacoustic signal.
The advantage that the utility model is compared with prior art had and useful technique effect as follows:
1, the utility model adopts and add an optoacoustic detection device on optical pumping gas THz laser basis; The Output of laser of THz laser can be locked on fixing spectral line, and keep the long-term stability of its power output and output frequency.
2, frequency regulator described in the utility model is used, by changing different working gass, rotating pumping CO
2in laser resonant cavity, grating angle used selects different branch line, can realize pumping CO
2the high stability of the different branch line of laser exports, thus the stable output of the THz laser obtaining different capacity and frequency.
3, the frequency regulator provided of the present utility model, THz laser basis with the addition of optoacoustic detection device, traditional PA cell and THz resonant cavity are united two into one, not only simplify experimental provision, compared to traditional independent light operatic tunes, the reaction of optoacoustic detection is sensitiveer, precision is higher; And photoacoustic signal not only can demonstrate CO
2the exporting change situation of laser, also can indicate CO
2whether the absworption peak centre frequency of laser frequency and THz laser works gas is in optimum Match state.
4, the frequency regulator that provides of the utility model, the acoustical signal produced in chamber after utilizing the optoacoustic detection device silicon micro-capacitive microphone being placed on THz resonant cavity centre position to carry out collecting work GAS ABSORPTION pumping laser energy; And carry out by the change detecting photoacoustic signal the Changing Pattern that real-time analysis obtains pump laser power and frequency.While detection pumping laser stability, also can indicate THz laser and whether be in optimum Match state, therefore, the optimization of this structure meets the requirement of optical pumping gas THz laser system for photo-acoustic detection more.
Accompanying drawing explanation
Fig. 1 is the utility model stablizes the frequency regulator of optical pumping gas THz Laser output structural schematic block diagram based on optoacoustic effect;
Fig. 2 is the cavity resonator structure schematic diagram of THz laser in Fig. 1;
Fig. 3 is the structural representation of pump laser in Fig. 1.
In figure: 1 pump laser, 2 Infrared Detectorss, 3THz resonant cavity, 4THz power meter, 5 beam splitters, 6 optoacoustic detection devices, 7 laser power supplies, 8 lock-in amplifiers, 9 the one PZT drivers, 10 the 2nd PZT drivers, 11 computers, 12ZnSe window, 13 the one PZT, the gold-plated total reflective mirror of 14 concave surface, 15THz laser output mirror, 16 take out inflatable interface, 17 gratings, 18 first total reflective mirrors, 19 the 2nd PZT, 20 outgoing mirrors, 21 second total reflective mirrors, 22 feedback control systems, 23 microphones.
Embodiment
The utility model to be described in further detail with specific embodiment below in conjunction with accompanying drawing; be necessary to herein means out be described embodiment just for further describing of the present utility model, and be not meant to be any restriction to the utility model protection range.
The utility model realizes the frequency regulator stablizing optical pumping gas THz laser output intent based on optoacoustic effect, the feedback control system 22 comprising pump laser 1, Infrared Detectors 2, THz resonant cavity 3, THz power meter 4, beam splitter 5, optoacoustic detection device 6, laser power supply 7 and be made up of lock-in amplifier 8, a PZT driver 9, the 2nd PZT driver 10 and computer 11; Wherein, described THz resonant cavity 3 comprises ZnSe window the 12, one PZT driver 9 being coated with anti-reflection film, microphone 23, a PZT 13, and concave surface gold-plated total reflective mirror 14, THz laser output mirror 15, takes out inflatable interface 16;
Grating 17 is comprised, the first total reflective mirror the 18, two PZT19, outgoing mirror 20, the second total reflective mirror 21 in described pump laser 1 resonant cavity;
The laser that in described frequency regulator, pump laser 1 exports is divided into two-way by beam splitter 5, and a road impinges perpendicularly on Infrared Detectors 2, and another road then enters THz resonant cavity 3; The holding wire of the microphone 23 in THz resonant cavity 3 is connected with the signalling channel of the lock-in amplifier 8 in feedback control system 22; The signal output part of lock-in amplifier 8 is connected with the computer 11 that data collecting card is housed by holding wire; The PZT 13 of computer 11 also in control THz resonant cavity 3; Described 2nd PZT driver 10 is connected with computer 11 and pump laser 1 that data collecting card is housed respectively, by the 2nd PZT19 in computer control pump laser 1; The pulse signal of described laser power supply 7 is connected with the reference channel signal of lock-in amplifier 8, and laser power supply 7 is supplied to pump laser 1 power supply used.
In described feedback control system 22, lock-in amplifier 8 receives the signal from optoacoustic detection device 6, and utilize cross-correlation test method: by doing cross-correlation function computing with reference signal to measured signal, restraint speckle also extracts photoacoustic signal from noise.
A described PZT driver 9 and the 2nd PZT driver 10: be respectively used to drive the PZT13 in pump laser 1 resonant cavity and in THz resonant cavity 3 and the 2nd PZT19, to regulate the chamber of the resonant cavity of pump laser 1 and THz resonant cavity 3 long, thus realize the output of its stabilized lasers.
In described feedback control system 22, be utilize oneself to write computer program for analyzing photoacoustic signal, and find out the displacement of PZT in pump laser corresponding to its peak value and peak value, piezoelectric ceramic on FEEDBACK CONTROL first total reflective mirror, to adjust the output frequency of pumping laser in real time, thus can by radio frequency CO
2laser frequency stabilization is at a certain absworption peak place of working gas, because a kind of working gas has a lot of fixing absworption peak, the frequency of the THz laser that different absworption peak correspondence produces is also different, which absworption peak place that selects according to required THz laser frequency is stabilized in, and remains optimum Match.Wherein: (1) pumping laser: carry out the piezoelectric ceramic in feedback regulation pump laser according to photoacoustic signal, Laser output is made to be stabilized in working gas absworption peak place; (2) THz laser: carry out the piezoelectric ceramic in feedback regulation THz laser according to THz power meter and photoacoustic signal, therefore, can make THz resonant cavity keep and the optimum Match of pumping laser, thus realizes the stable of its power output and frequency.
The frequency regulator stablizing the output of optical pumping gas THz laser based on optoacoustic effect described in the utility model, adopts and add an optoacoustic detection device on the basis of optical pumping gas THz laser; The optoacoustic detection device added is adopted to detect photoacoustic signal and the change thereof of working gas absorptive pumping laser generation in optical pumping gas THz resonant cavity 3; According to the situation of change of photoacoustic signal that detection obtains, feedback control system is utilized to control the second piezoelectric ceramic in pumping laser resonant cavity and in THz resonant cavity and the first piezoelectric ceramic respectively; To regulate the chamber of the resonant cavity of pump laser and THz resonant cavity long, the stability of pump laser power output and output frequency can be realized, and then realize the stable of optical pumping gas THz laser output power and output frequency.
Described optimum Match refers to that the centre frequency of the centre frequency of pumping laser and the absworption peak of THz laser working gas is consistent, now maximum by the gas molecule number of selective exitation.
Embodiment
The frequency regulator that the present embodiment uses the utility model to provide realizes the stable of optical pumping gas THz laser output power and output frequency, and operate according to the following steps, whole operating process adopts the computer program oneself write to carry out; First connect each components and parts according to structure installment shown in Fig. 1, and adjust light path.
The present embodiment components and parts title used, model:
Described pump laser 1 adopts RF excited plate waveguide CO
2laser;
Described grating 17, former quarter grating 100 lines/mm;
Described lock-in amplifier 8, ND-207 type binary channels lock-in amplifier;
Two PZT used: the 2nd PZT19 in pump laser is adopt encapsulation type column piezoelectric ceramic, and stroke is 20 microns; A PZT13 in THz resonant cavity 3 adopts encapsulation type tubular piezo-electric pottery, and stroke is 200 microns, and described microphone 23 adopts silicon micro-capacitive microphone, selects the EK-23024-000 type microphone of Knowles company.
THz laser resonant cavity 3 adopts flat-recessed resonant cavity, and pumping laser input adopts Small aperture coupling input mode, and wherein, the gold-plated speculum of concave surface is bronze mirror, and central bore 2mm is as the input hole of the Output of laser of pump laser 1.It is substrate that THz laser output mirror 15 adopts with quartz, plated film be added with the level crossing of metallic mesh, is coated with the high-reflecting film to 9.6 μm of laser, to THz laser part through; Long 1.5 meters of chamber, its resonant cavity radius is 25mm, and main body adopts stainless steel, and inner surface polishing is to reduce the loss of pumping light.
Take out inflatable interface 16 as the interface vacuumizing and fill working gas, vacuumized by THz laserresonator and be filled with methyl alcohol, maintenance air pressure is 25Pa, and keeps constant temperature and constant voltage as far as possible.Grating 17 corner is regulated to make CO
2laser keeps 9P (36) branch line to export, and THz laser now exports the thz laser for 2.52THz; Regulate CO
2the second piezoelectric ceramic in laser, scans out the peak value of photoacoustic signal, and then utilizes computer software quick regulating and controlling chamber long, makes CO
2laser exports and remains at photoacoustic signal peak value place.On this basis, the chamber being changed THz resonant cavity by the first piezoelectric ceramic in adjustment THz resonant cavity 3 is long, observed by THz power meter while adjustment chamber is long and record THz power output, find the output peak of THz laser, and by regulating the chamber of THz resonant cavity long in real time, THz laser being remained on and exports peak place.
By the experiment of the present embodiment, pumping source CO
2the output power stability of laser can reach 1%, output frequency Absorbable organic halogens is wherein near heart spectral line within 2MHz, again further combined with the FEEDBACK CONTROL to THz chamber, make THz laser output power stability about 1.3%, within output frequency is stabilized in 100kHz, carry out detection power stability by THz power meter.
The process letter operating procedure of the computer program analysis photoacoustic signal that described employing is self-editing is as follows:
1. control the 2nd PZT19 in pump laser 1 with periodic serrations wave voltage, make its Resonant Intake System do periodically change, the situation of change of real-time detection photoacoustic signal, and record the displacement P of the 2nd PZT19 and corresponding photoacoustic signal value A;
2., by analyzing the photoacoustic signal value A recorded, find out the peak A of photoacoustic signal
maxwith the displacement P of the 2nd PZT19 corresponding to this peak value
max;
3. by the 2nd PZT19 in the 2nd PZT driver control pump laser 1 in feedback control system 22, and make its displacement be stabilized in P
maxplace;
4. use Infrared Detectors 2 Real-Time Monitoring photoacoustic signal in light path, if photoacoustic signal value A and its peak A
maxwhen differing by more than setting threshold B, again corresponding adjustment is carried out to the 2nd PZT in pump laser 1, make photoacoustic signal value A and its peak A
maxdifference remain at setting threshold B within; Namely be adjusted to photoacoustic signal and can be stabilized in peak A
maxwithin the threshold value B of neighbouring setting.
Claims (7)
1. stablize a frequency regulator for optical pumping gas THz laser output power and frequency based on optoacoustic effect, it is characterized in that the feedback control system (22) comprising pump laser (1), Infrared Detectors (2), THz resonant cavity (3), THz power meter (4), beam splitter (5), optoacoustic detection device (6), laser power supply (7) and be made up of lock-in amplifier (8), a PZT driver (9), the 2nd PZT driver (10) and computer (11); ZnSe window (12) is comprised in described THz resonant cavity (3), one PZT (13), the gold-plated total reflective mirror of concave surface (14), optoacoustic detection device (6), THz laser output mirror (15), takes out inflatable interface (16); Described pump laser (1) comprises the grating (17) in resonant cavity, the first total reflective mirror (18) and the second total reflective mirror (21), the 2nd PZT (19) and outgoing mirror (20);
The laser that described pump laser (1) exports is divided into two-way by beam splitter (5), and a road impinges perpendicularly on Infrared Detectors (2), and another road then enters in THz resonant cavity (3); Optoacoustic detection device (6) in THz resonant cavity is connected with lock-in amplifier (8) in feedback control system (22); Lock-in amplifier is connected with laser power supply (7) and computer (11) respectively, computer is also connected with a PZT driver (9) and the 2nd PZT driver (10) respectively, and controls a PZT (13) and the 2nd PZT (19) respectively.
2. frequency regulator according to claim 1, it is characterized in that described optoacoustic detection device (6) adopts optoacoustic inducing function material or microphone to carry out photoacoustic signal detection, described microphone comprises silicon micro-capacitive microphone or silicon micro piezoelectric formula microphone or cantilever type microphone, or ultrasound piezoelectric ceramic microphone.
3. frequency regulator according to claim 1, is characterized in that described pump laser (1) adopts the RF excited plate waveguide CO of Z-type refrative cavity
2laser, its laser power supply (7) adopts radio-frequency power supply as working power.
4. the frequency regulator according to claim 1 or 3, it is characterized in that in described pump laser (1) resonant cavity, the 2nd PZT (19) is long to change its chamber by the 2nd PZT driver drives (10) in feedback control system (22), and by grating (17) choosing in pump laser resonant cavity.
5. frequency regulator according to claim 1, it is characterized in that described THz resonant cavity (3) adopts flat-recessed resonant cavity, pumping laser input adopts Small aperture coupling input mode, namely adopt the gold-plated total reflective mirror of a foraminate concave surface in centre (14), a PZT (13) is placed at its back side.
6. frequency regulator according to claim 1 or 5, is characterized in that described THz laser output mirror (15) adopts radio frequency excitation plate Luciola substriata CO
2laser is high anti-, and to THz laser part through level crossing.
7. frequency regulator according to claim 1 and 2, it is characterized in that described optoacoustic detection device (6) adopts silicon micro-capacitive microphone (23), and be placed on the centre position of THz resonant cavity (3), for detecting the acoustical signal in its resonant cavity; And make silicon micro-capacitive microphone (23) opening concordant with THz resonant cavity (3) tube wall.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767114A (en) * | 2015-04-20 | 2015-07-08 | 四川大学 | Method for stabilizing output of optical pump gas THz laser based on opto-acoustic effect |
| CN107453189A (en) * | 2017-09-25 | 2017-12-08 | 中国工程物理研究院激光聚变研究中心 | A kind of thz laser device system |
| WO2019144499A1 (en) * | 2018-01-29 | 2019-08-01 | 雄安华讯方舟科技有限公司 | Terahertz driving device |
| CN112945909A (en) * | 2021-01-29 | 2021-06-11 | 武汉光谷航天三江激光产业技术研究院有限公司 | Laser reflection element power detection device and method based on resonance enhancement effect |
-
2015
- 2015-04-20 CN CN201520241121.5U patent/CN204481321U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767114A (en) * | 2015-04-20 | 2015-07-08 | 四川大学 | Method for stabilizing output of optical pump gas THz laser based on opto-acoustic effect |
| CN107453189A (en) * | 2017-09-25 | 2017-12-08 | 中国工程物理研究院激光聚变研究中心 | A kind of thz laser device system |
| CN107453189B (en) * | 2017-09-25 | 2023-06-02 | 中国工程物理研究院激光聚变研究中心 | Terahertz laser system |
| WO2019144499A1 (en) * | 2018-01-29 | 2019-08-01 | 雄安华讯方舟科技有限公司 | Terahertz driving device |
| CN112945909A (en) * | 2021-01-29 | 2021-06-11 | 武汉光谷航天三江激光产业技术研究院有限公司 | Laser reflection element power detection device and method based on resonance enhancement effect |
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Granted publication date: 20150715 Effective date of abandoning: 20180216 |