CN108054630A - A kind of lock chamber device and method of automatic resonant frequency torus - Google Patents
A kind of lock chamber device and method of automatic resonant frequency torus Download PDFInfo
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- CN108054630A CN108054630A CN201810040601.3A CN201810040601A CN108054630A CN 108054630 A CN108054630 A CN 108054630A CN 201810040601 A CN201810040601 A CN 201810040601A CN 108054630 A CN108054630 A CN 108054630A
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- lock chamber
- feedback control
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 16
- 239000013307 optical fiber Substances 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000002789 length control Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012827 research and development Methods 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
- H01S3/106—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
- H01S3/108—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 non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
- H01S3/1095—Frequency multiplication, e.g. harmonic generation self doubling, e.g. lasing and frequency doubling by the same active medium
-
- 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
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
Abstract
The present invention relates to laser resonance frequency multiplication field, more particularly to a kind of lock chamber device and method of automatic resonant frequency torus.The present invention generates two paths of signals by DDS sines wave generating device first, is separately input to frequency mixing module and acousto-optic modulator；The transmission peak-to-peak signal of frequency multiplication torus and reflection peak-to-peak signal are input to frequency mixing module and automatic feedback control module respectively again.Utilize the frequency discrimination curve of frequency mixer（PDH principles）With transmission peak-to-peak signal, automatic feedback control module can switch and work in " frequency sweep " and " lock chamber " two states automatically.Automatic feedback control module will export result by being acted on after high pressure amplifier on the piezoelectric ceramics of frequency multiplication torus, realize closed-loop control.The present invention improves existing torus frequency doubling technology using automatic lock chamber functional device, realizes automatic lock chamber, keeps locking at the time of frequency multiplication torus, can automatically restore to lock-out state after losing lock rapidly.
Description
Technical field
The present invention relates to laser resonance frequency multiplication field, the lock chamber device of more particularly to a kind of automatic resonant frequency torus and
Method.
Background technology
The laser of continuous high power single-frequency 532nm if directly carrying out frequency multiplication to 1064nm laser using frequency-doubling crystal, is deposited
Transfer efficiency is low the problem of.It, can be by transfer efficiency largely by way of resonance using 8 word frequency multiplication torus
It improves.To meet industrialization demand, it is necessary to realize full-automation, it is desirable that the device can automatically lock resonant frequency torus
It is fixed.It is required for realizing in certain input power excursion and lock, and with common-path interference, when losing lock occurs, energy
It is enough to lock again automatically.
Therefore, on the basis of existing, a kind of method and dress that can realize automatic locking resonant frequency torus of research and development
It puts very necessary.Certain operations may need the different sine wave of manual configuration two-way at present, and manually mode in lock chamber and is looked for
Switch between " zero point ".Some devices because the method for use is incomplete, system rejection to disturbance ability is weak and losing lock recovery time compared with
It is long.
The content of the invention
The problem of in background technology, it is an object of the invention to propose a kind of lock chamber of automatic resonant frequency torus
Device and method.The present invention improves existing torus frequency doubling technology using automatic lock chamber functional device, realizes automatic lock
Chamber keeps locking at the time of frequency multiplication torus, can automatically restore to lock-out state after losing lock rapidly.
To achieve the above object, the following technical solutions are proposed by the present invention：
A kind of lock chamber device of automatic resonant frequency torus, it is sinusoidal which includes optical fiber laser, frequency multiplication torus, DDS
Signal generating module, transmission peaks signal detection module, reflection peak signal detection module, frequency mixer, high pressure amplifier module and automatic
Feedback control module.
The laser that the optical fiber laser is sent injects frequency multiplication torus after acousto-optic modulator modulates shift frequency, will be anti-
Peak detectable signal and local oscillation signal input mixer, then exported by frequency mixer simultaneously are penetrated, is linked into automatically by low-pass filter
Feedback control module；The automatic feedback control module follows result of calculation by acting directly on frequency multiplication after high pressure amplifier module
On the piezoelectric ceramics of ring cavity, whole process forms closed-loop control, and realization carries out lock chamber to resonant frequency torus automatically.
Further, the frequency multiplication torus includes 8 word torus, frequency-doubling crystal and piezoelectric ceramics；Wherein, four chambers
Mirror：M1, M2, M3 and M4 form 8 word torus；
The chamber length of the frequency multiplication torus is adjustable, installs piezoelectric ceramics additional at the reflection-type hysteroscope back of intracavitary, passes through height
The voltage signal control piezoelectric ceramics deformation of amplifier module output is pressed, drives the above-mentioned light for being subjected to displacement to change intracavitary of hysteroscope
Journey, and then it is long to change chamber.
Further, the automatic feedback control module is according to the frequency discrimination signal of frequency mixer and the state of transmission peak-to-peak signal,
Automatically switch between " frequency sweep " or " lock chamber " two states；
When in frequency sweep mode, once meeting lock chamber condition, i.e., suitable " zero point " position immediately enters lock chamber, opens and adjust；
When cavity losing lock, automatically from lock cavity-like state back to frequency sweep state, suitable lock chamber condition is found；
" zero point " is when chamber length meets laser resonance frequency multiplication, and the output result of frequency mixer is zero.
Further, the module generation two-way that two-way frequency is equal, amplitude is different with phase occurs for the DDS sinusoidal signals
Sine wave signal is loaded into the EOM of laser and the local oscillation signal end of frequency mixer by low-pass filter and power amplifier respectively
Mouthful.
Further, the optical fiber laser is continuous wave all solid state laser or continuous wave optical fiber laser.
A kind of lock cavity method of automatic resonant frequency torus, comprises the following steps：
1）Automatic feedback control module sets the running parameter of package unit first；
2）The transmitted light of frequency multiplication torus is detected by transmission peaks signal detection module, obtains required transmission peaks electricity
Signal；
3）Automatic feedback control module by the current state of transmission peaks electric signal real-time judge, if near " zero point ",
It into " lock chamber " state, opens PID and adjusts, chamber length is controlled according to the error signal value of frequency mixer；If not " zero
Near point ", then close PID and adjust into " frequency sweep " state, acted on piezoelectric ceramics, realized to resonance using sawtooth voltage
The chamber length of frequency multiplication torus is continuous to be changed, until finding suitable lock chamber position.
Further, in step 1）In, the running parameter includes DDS sinusoidal signals parameter and dead-center position parameter.
Further, in step 3）In, " zero point " is the output of frequency mixer when chamber length meets laser resonance frequency multiplication
As a result it is zero.
Compared with the prior art, beneficial effects of the present invention are as follows：
（1）The present invention without using any other laboratory equipment, manual operation is not required, you can it is automatic to carry out frequency multiplication torus
Locking.
（2）Automatic frequency multiplication torus locking device of the invention can receive the situation of external interference in laser frequency or cavity
Under, can quickly it recover from out-of-lock condition to stable state.
（3）The automatic feedback control module of the present invention can carry out frequency sweep, look for " zero point ", lock three steps of chamber automatically.
When interference, it can also recover rapidly when there is losing lock, any manual operation is not required in whole process.Utilize frequency mixer
Frequency discrimination curve（PDH principles）With transmission peak-to-peak signal, automatic feedback control module can be automatically in " frequency sweep " and " lock chamber " two kinds of shapes
State switches and work.
Description of the drawings
Fig. 1 is the structure diagram of the lock chamber device of the automatic resonant frequency torus of the present invention；
Fig. 2 is the schematic diagram of the frequency multiplication torus of the present invention；
In figure respective digital marked as：1st, semiconductor light fibre laser；2nd, optical resonance frequency multiplication torus；3rd, DDS sinusoidal signals
Generation module；4th, transmission peaks signal detection module；5th, reflection peak signal detection module；6th, frequency mixer；7th, high pressure amplifier module；8、
Automatic feedback control module；1., the EOM ports of optical fiber laser；2., the transmission light exit of frequency multiplication torus；3., frequency multiplication cycle
The piezoelectric ceramics Wiring port of chamber；4., the reflection light exit of frequency multiplication torus；F3, frequency-doubling crystal；PZT, piezoelectric ceramics.
Specific embodiment
With reference to the accompanying drawings and detailed description, specific embodiments of the present invention are made with detailed elaboration.These tools
Body embodiment is only not used for limiting the scope of the present invention or implementation principle for narration, and protection scope of the present invention is still with power
Subject to profit requirement, including obvious changes or variations made on this basis etc..
The lock chamber device of a kind of automatic resonant frequency torus provided by the invention, using the frequency of lasing light emitter as with reference to frequency
Rate is locked.The device is made of light path device and electricity feedback control loop；Light path device is mainly by laser, acousto-optic modulation
The compositions such as device, 8 word frequency multiplication torus and piezoelectric ceramics, electricity feedback device is mainly by photoelectric detection module, DDS sinusoidal signals
Generation module, frequency mixer, high pressure amplifier module and automatic feedback control module composition.DDS sinusoidal signals occur module and generate two
The two-way sine wave signal that road frequency is equal, amplitude is different with phase is loaded into the EOM of laser by power amplifier respectively
With the local oscillation signal port of frequency mixer.Automatic feedback control module cycles frequency doubling cavity frequency sweep by high pressure amplifier to 8 words, by photoelectricity
The transmission peak-to-peak signal of detector is connected to digital control circuit；When scanning is to zero crossings, automatic feedback control module stops
Scanning, opens closed loop feedback control, and the error signal of feedback is mixed by the local oscillation signal of frequency mixer and the reflected signal of 8 word torus
Frequency obtains.It is powered on from laser, frequency multiplication torus is lockked, whole process without human intervention, can be real within the extremely short time
Now lock.
The laser is continuous wave all solid state laser or continuous wave optical fiber laser.
The DDS signal generator can generate the different sine wave signal of two-way simultaneously, and with amplitude modulation and tune
The function of phase, can be automatically into the configuration of line frequency, phase and amplitude.
The automatic feedback control module can carry out frequency sweep, look for " zero point ", lock three steps of chamber automatically.Because dry
When disturbing, it can also recover rapidly when there is losing lock, any manual operation is not required in whole process.
" frequency sweep " is to be acted on using sawtooth voltage on piezoelectric ceramics, realizes the chamber to resonant frequency torus
Long continuous change.
" zero point " is when chamber length meets laser resonance frequency multiplication, and the output result of frequency mixer is zero.
" the lock chamber " is to open pid algorithm, and chamber length is controlled according to the error signal value of frequency mixer.
The lock chamber device of a kind of automatic resonant frequency torus as shown in Figure 1, including semiconductor light fibre laser 1, light
Learn resonant frequency torus 2, module 3, transmission peaks signal detection module 4, reflection peak signal detection module occur for DDS sinusoidal signals
5th, frequency mixer 6, high pressure amplifier module 7 and automatic feedback control module 8；DDS sinusoidal signals occur module 3 and automatically configure needs
The signal of generation is respectively fed to the EOM ports of semiconductor light fibre laser 1 and frequency mixer 6 by signal frequency, amplitude and phase
Local oscillation signal port；The laser light incident of semiconductor light fibre laser 1 is into optical resonance frequency multiplication torus 2, transmission peak-to-peak signal inspection
Surveying module 4 and reflection peak signal detection module 5 will be respectively fed in automatic feedback control module 8 and is mixed after the signal processing of detection
The radiofrequency signal port of frequency device 6；The mixed frequency signal of frequency mixer 6 is inputted into automatic feedback control module 8, automatic feedback control
Module 8 is judged according to mixed frequency signal and transmission peak-to-peak signal.Result of calculation is passed through high pressure amplifier by automatic feedback control module 8
Module 7 is acted on the piezoelectric ceramics of optical resonance frequency multiplication torus 2, and real-time adjusting cavity is long.
In Fig. 1, what is 1. represented is the EOM ports of optical fiber laser；2. what is represented is that the transmitted light of frequency multiplication torus goes out
Mouthful；3. what is represented is the piezoelectric ceramics Wiring port of frequency multiplication torus；4. what is represented is the reflection light exit of frequency multiplication torus.
Optical resonance frequency multiplication torus 2 includes 8 word torus, frequency-doubling crystal and piezoelectric ceramics；In Fig. 2, four hysteroscopes：
M1, M2, M3 and M4 form 8 word torus, and F3 is frequency-doubling crystal, and PZT is piezoelectric ceramics.M1, M2, M3 and M4 are hysteroscopes, four
A hysteroscope constitutes the resonant optical path of a 8-shaped, that is, 8 word torus, and the laser of input cycles instead between four hysteroscopes
It penetrates, iterates through frequency-doubling crystal F3.Wherein, seed laser is inputted from M1, and the laser after frequency multiplication is exported from M4；It is overflowed at M1
Light is reflected light, is detected by reflection peak signal detection module 5；The light overflowed at M3 is transmitted light, by transmission peak-to-peak signal
Detection module 4 is detected.
Frequency multiplication torus grows variable structure for chamber, that is to say, that there is the long adjusting mechanism of chamber in frequency multiplication torus, it can be with
Response external electric signal makes chamber length make change, specifically, being exactly to install piezoelectric ceramics additional at the reflection-type hysteroscope M2 backs of intracavitary
PZT passes through high pressure amplifier module（7）The voltage signal control PZT deformation of output, drives hysteroscope M2 to be subjected to displacement to change chamber
Interior light path, that is, to change chamber long.
A kind of lock cavity method of automatic resonant frequency torus provided by the invention, step are as follows：
1) in above-mentioned automatic laser frequency regulator, automatic feedback control module 8 sets the running parameter of package unit first, bag
Include DDS sinusoidal signals parameter configuration, dead-center position is set；
2）Pass through transmission peaks signal detection module（4）To frequency multiplication torus（2）Transmitted light detected, obtain it is required
Penetrate peak electric signal；
3）Automatic feedback control module（8）By the current state of transmission peaks electric signal real-time judge, if near " zero point ",
Then into " lock chamber " state, open PID and adjust, according to frequency mixer（6）Error signal value to chamber length control；If do not exist
Near " zero point ", then close PID and adjust into " frequency sweep " state, acted on using sawtooth voltage on piezoelectric ceramics, realization pair
Resonant frequency torus（2）Chamber length it is continuous change, until finding suitable lock chamber position.
Claims (6)
1. a kind of lock chamber device of automatic resonant frequency torus, which is characterized in that described device includes optical fiber laser（1）、
Frequency multiplication torus（2）, DDS sinusoidal signals occur module（3）, transmission peaks signal detection module（4）, reflection peak signal detection module
（5）, frequency mixer（6）, high pressure amplifier module（7）With automatic feedback control module（8）；
The optical fiber laser（1）The laser sent injects frequency multiplication torus after acousto-optic modulator modulates shift frequency（2）, will
Reflection peak detectable signal and local oscillation signal while input mixer（6）, then by frequency mixer（6）Output, is connect by low-pass filter
Enter to automatic feedback control module（8）；The automatic feedback control module（8）Result of calculation is passed through into high pressure amplifier module（7）
After act directly on frequency multiplication torus（2）Piezoelectric ceramics on, whole process formed closed-loop control, realize automatically to resonant frequency
Torus carries out lock chamber.
2. a kind of lock chamber device of automatic resonant frequency torus according to claim 1, it is characterised in that：The frequency multiplication
Torus includes 8 word torus, frequency-doubling crystal and piezoelectric ceramics.
3. a kind of lock chamber device of automatic resonant frequency torus according to claim 1, it is characterised in that：The optical fiber
Laser（1）For continuous wave all solid state laser or continuous wave optical fiber laser.
4. a kind of lock cavity method of automatic resonant frequency torus, it is characterised in that：It the described method comprises the following steps：
1）Automatic feedback control module（8）The running parameter of package unit is set first；
2）Pass through transmission peaks signal detection module（4）To frequency multiplication torus（2）Transmitted light detected, obtain it is required
Penetrate peak electric signal；
3）Automatic feedback control module（8）By the current state of transmission peaks electric signal real-time judge, if near " zero point ",
Then into " lock chamber " state, open PID and adjust, according to frequency mixer（6）Error signal value to chamber length control；If do not exist
Near " zero point ", then close PID and adjust into " frequency sweep " state, acted on using sawtooth voltage on piezoelectric ceramics, realization pair
Resonant frequency torus（2）Chamber length it is continuous change, until finding suitable lock chamber position.
5. a kind of lock cavity method of automatic resonant frequency torus according to claim 4, it is characterised in that：
In step 1）In, the running parameter includes DDS sinusoidal signals parameter and dead-center position parameter.
6. a kind of lock cavity method of automatic resonant frequency torus according to claim 4, it is characterised in that：In step
3）In, " zero point " is the frequency mixer when chamber length meets laser resonance frequency multiplication（6）Output result be zero.
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|---|---|---|---|
| CN201810040601.3A CN108054630A (en) | 2018-01-16 | 2018-01-16 | A kind of lock chamber device and method of automatic resonant frequency torus |
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| CN201810040601.3A CN108054630A (en) | 2018-01-16 | 2018-01-16 | A kind of lock chamber device and method of automatic resonant frequency torus |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842761A (en) * | 2017-03-15 | 2017-06-13 | 中国科学院上海光学精密机械研究所 | Optics cavity automatic locking apparatus and its lock cavity method based on analog circuit |
| CN106877168A (en) * | 2017-03-07 | 2017-06-20 | 中国科学院国家授时中心 | A kind of locking device of the optical cavity based on EOM and PZT |
| CN207925890U (en) * | 2018-01-16 | 2018-09-28 | 南京先进激光技术研究院 | A kind of lock chamber device of automatic resonant frequency torus |
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2018
- 2018-01-16 CN CN201810040601.3A patent/CN108054630A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877168A (en) * | 2017-03-07 | 2017-06-20 | 中国科学院国家授时中心 | A kind of locking device of the optical cavity based on EOM and PZT |
| CN106842761A (en) * | 2017-03-15 | 2017-06-13 | 中国科学院上海光学精密机械研究所 | Optics cavity automatic locking apparatus and its lock cavity method based on analog circuit |
| CN207925890U (en) * | 2018-01-16 | 2018-09-28 | 南京先进激光技术研究院 | A kind of lock chamber device of automatic resonant frequency torus |
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