CN107092105A - Acousto-optic modulator, the method and laser for improving acousto-optic modulator output light energy - Google Patents
Acousto-optic modulator, the method and laser for improving acousto-optic modulator output light energy Download PDFInfo
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- CN107092105A CN107092105A CN201710356771.8A CN201710356771A CN107092105A CN 107092105 A CN107092105 A CN 107092105A CN 201710356771 A CN201710356771 A CN 201710356771A CN 107092105 A CN107092105 A CN 107092105A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/125—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves in an optical waveguide structure
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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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/117—Q-switching using intracavity acousto-optic devices
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Embodiment of the present invention discloses acousto-optic modulator, improves the method and laser of acousto-optic modulator output light energy, and acousto-optic modulator includes acousto-optic crsytal, incident light beam strikes acousto-optic crsytal+1 grade of light of outgoing and 1 grade of light successively；Time delay optical fiber is connected in+1 grade of collimater exit direction so as to+1 grade of light delay preset duration and be overlapped with 1 grade of light in sequential, time delay optical fiber is all connected with bundling device with 1 grade of collimater exit direction, and 1 grade of light closes beam by the bundling device with+1 grade of light after delay and exported.Thus, 1 grade of light, i.e., the light propagated by the original direction of propagation is also utilized, rather than is compromised, and improves energy conversion rate and utilization rate.
Description
Technical field
Embodiment of the present invention is related to field of laser device technology, more particularly to acousto-optic modulator, raising acousto-optic modulator
The method and laser of output light energy.
Background technology
The light channel structure of Q adjusting optical fiber laser includes acousto-optic modulator, for adjusting the width of pulse.
In Q adjusting optical fiber laser, there is problems with, merely with the Bragg diffraction light occurred through acousto-optic modulator, press
The light that the direction of propagation (incident direction) originally is propagated is not utilized, but is compromised, therefore causes energy dissipation.
The content of the invention
The present invention make use of Bragg diffraction light but revealed for prior art to be propagated by the original direction of propagation
Light, and cause the technical problem of energy dissipation there is provided acousto-optic modulator, improve acousto-optic modulator output light energy method and
Laser.
In order to solve the above technical problems, the technical scheme that embodiment of the present invention is used is：Acousto-optic modulator is provided,
Including acousto-optic crsytal, incident light beam strikes acousto-optic crsytal+1 grade of light of outgoing and -1 grade of light successively；The acousto-optic modulator also includes connecing
Receive+1 grade of collimater of+1 grade of light of -1 grade of collimater and reception of -1 grade of light ,+1 grade of collimater exit direction connection delay
Optical fiber with -1 grade of light in sequential so as to+1 grade of light delay preset duration and overlap, time delay optical fiber and -1 grade of collimater exit direction
Bundling device is all connected with, -1 grade of light closes beam by the bundling device with+1 grade of light after delay and exported.
Wherein, it is specially by -1 grade of light of time delay optical fiber and transmission that the bundling device, which closes -1 grade of light of beam with+1 grade of light after delay,
- 1 grade of optical fiber fused tapering and with output optical fibre welding；
The acousto-optic modulator also includes driving power supply, the master control borad for controlling driving power supply signal and connected with the master control borad
At least one photodetector connect, at least one described photodetector is located at weld and/or output optical fibre along its length
On bearing of trend.
Wherein, the master control borad is used for the ratio of the optical signal value and default optical signal value gathered according to the photodetector
Relatively result adjusts the driving power supply signal or outputting alarm signal.
Wherein, the incident light is with the incident acousto-optic crsytal of Bragg angle；- 1 grade of light is incident light through the sound
Luminescent crystal presses the light of incident light direction outgoing, and+1 grade of light is the Bragg diffraction that incident light occurs through the acousto-optic crsytal
Light；
The length of the time delay optical fiber is calculated by following formula：
L=t1*c
In formula, L represents the total length of time delay optical fiber；T1 for Acousto-Optic Modulator Driver signal high level it is lasting when
Between；C is the speed that light is transmitted in a fiber.
Wherein, the dutycycle of the driving power supply signal is 50%.
Wherein, the disk fibre of the time delay optical fiber is shaped as oval ring or annular.
Wherein, the acousto-optic modulator is also included on the heat-radiating substrate for the delay light radiating, the heat-radiating substrate
Stopper slot is set, and the time delay optical fiber is embedded in the stopper slot and is secured by it.
In order to solve the above technical problems, another technical scheme that embodiment of the present invention is used is：Laser, bag are provided
Include above-mentioned acousto-optic modulator.
Wherein, the laser also includes one-level amplification light path, is connected with one-level amplification light path and is one-level amplification
The pumping source of energy needed for light path provides one-level amplification, be connected with the acousto-optic modulator signal light output side and by flashlight again
Two grades of amplification light paths of amplification and the output optoisolator being connected with described two grades amplification light path outlet sides.
In order to solve the above technical problems, another technical scheme that embodiment of the present invention is used is：There is provided and improve acousto-optic
The method of modulator output light energy, the acousto-optic modulator includes acousto-optic crsytal, and the acousto-optic modulator also includes -1 grade of standard
Straight device ,+1 grade of collimater, time delay optical fiber and bundling device；Methods described includes：
Acousto-optic crsytal described in incident light beam strikes and respectively -1 grade of light of outgoing and+1 grade of light；
- 1 grade of collimater receives -1 grade of light；+ 1 grade of collimater receives+1 grade of light；
+ 1 grade of collimater exit direction connect the time delay optical fiber so that+1 grade of light delay preset duration and with -1 grade
Light is overlapped in sequential, and time delay optical fiber is all connected with bundling device, -1 grade of light and+1 grade of light after delay with -1 grade of collimater exit direction
Beam is closed by the bundling device and is exported.
Wherein, it is specially by -1 grade of light of time delay optical fiber and transmission that the bundling device, which closes -1 grade of light of beam with+1 grade of light after delay,
- 1 grade of optical fiber fused tapering and with output optical fibre welding；
The acousto-optic modulator also includes driving power supply, the master control borad for controlling driving power supply signal and connected with the master control borad
At least one photodetector connect, at least one described photodetector is located at weld and/or output optical fibre along its length
On bearing of trend.
Wherein, the master control borad is used for the ratio of the optical signal value and default optical signal value gathered according to the photodetector
Relatively result adjusts the driving power supply signal or outputting alarm signal.
The beneficial effect of embodiment of the present invention is：It is different from the situation of prior art, the acousto-optic of embodiment of the present invention
Modulator includes acousto-optic crsytal, incident light beam strikes acousto-optic crsytal+1 grade of light of outgoing and -1 grade of light successively；In+1 grade of collimater
Exit direction connects time delay optical fiber so as to+1 grade of light delay preset duration and be overlapped with -1 grade of light in sequential, time delay optical fiber and -1
Level collimater exit direction is all connected with bundling device, and -1 grade of light closes beam by the bundling device with+1 grade of light after delay and exported.By
This, -1 grade of light, i.e., the light propagated by the original direction of propagation is also utilized, rather than is compromised, and is improved energy and is turned
Change rate and utilization rate.
Brief description of the drawings
One or more embodiments are illustrative by the picture in corresponding accompanying drawing, these exemplary theorys
The element with same reference numbers label is expressed as similar element in the bright restriction not constituted to embodiment, accompanying drawing, removes
Composition is not limited the non-figure having in special statement, accompanying drawing.
Fig. 1 is the schematic diagram of acousto-optic modulator of the embodiment of the present invention；
Fig. 2 is the signal timing diagram of acousto-optic modulator of the embodiment of the present invention；
Fig. 3 is the light path principle figure of acousto-optic modulator of the embodiment of the present invention；
Fig. 4 is the light path principle figure of another embodiment of the present invention acousto-optic modulator；
Fig. 5 is the signal timing diagram of another embodiment of the present invention；
Fig. 6 is the schematic diagram of laser of the embodiment of the present invention；
Fig. 7 is the flow chart for the method that the embodiment of the present invention improves acousto-optic modulator output light energy.
Embodiment
The present invention is described in further details below by way of the drawings and specific embodiments.
For the ease of understanding the present invention, with reference to the accompanying drawings and detailed description, the present invention is carried out in more detail
It is bright.Unless otherwise defined, technology all used in this specification and scientific terminology are with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Used term is intended merely to retouch in the description of the invention in this specification
The purpose of specific embodiment is stated, the limitation present invention is not intended to.
Embodiment 1
Fig. 1 is the schematic diagram of acousto-optic modulator of the embodiment of the present invention.As shown in figure 1, acousto-optic modulator 10 includes acousto-optic crystalline substance
Body 101, PZT (piezoelectric transducer) 102 and driving power supply 103.The electric signal driving PZT (piezoelectric transducer) of driving power supply 103, works as acousto-optic modulation
When device 10 has pulse signal, i.e., pulse signal high level when, density phase can occur for the refractive index of acousto-optic crsytal in acousto-optic modulator
Between change, formed grating.If at this moment incident light with Bragg angle θ B by acousto-optic crsytal when, it may occur that diffraction so that light
Generation deviation, deviates the original direction of propagation, and occur deviation is+1 grade of light.When acousto-optic modulator does not have pulse signal, i.e.,
During pulse signal low level, acousto-optic crsytal refractive index will not be changed, and light can be propagated by the original direction of propagation, be -1
Level light, as incident light press the light of incident light direction outgoing through the acousto-optic crsytal.
Driving power supply signal ,+1 grade of optical signal, sequential relationship between -1 grade of optical signal, laser output optical signal are as schemed
Shown in 2.As shown in Fig. 2 driving power supply signal high level, which produces+1 grade of optical signal, driving power supply signal low level, produces -1 grade of light
Signal, laser output optical signal and driving power supply signal high level ,+1 grade of optical signal are consistent in sequential.
Fig. 3 and Fig. 4 are the light path principle figure of acousto-optic modulator of the embodiment of the present invention.As shown in Figure 3, Figure 4, the present invention is real
The acousto-optic modulator 10 of example, including acousto-optic crsytal 101 are applied, incident light goes out successively through the incident acousto-optic crsytal 101 of incident collimater 108
Penetrate+1 grade of light and -1 grade of light；The acousto-optic modulator 10 also includes+1 grade of -1 grade of collimater 104 and reception for receiving -1 grade of light
+ 1 grade of collimater 105 of light, the exit direction of+1 grade of collimater 105 connection time delay optical fiber 106 are so that+1 grade of light delay is default
Duration is simultaneously overlapped with -1 grade of light in sequential, and time delay optical fiber 106 is all connected with bundling device with -1 grade of exit direction of collimater 104
107, -1 grade of light closes beam by the bundling device 107 with+1 grade of light after delay and exported.
As shown in figure 3, being incided by the incident light of incident collimater 108 with Bragg angle θ B on acousto-optic crsytal 101, go out
Penetrate light to be received with two collimaters respectively ,+1 grade of light of a reception, another receives -1 grade of light ,+1 grade of optical collimator 105 and -1
It is all Bragg angle θ B that level optical collimator 104 is at an angle of size with the axial direction of acousto-optic crsytal 101 respectively.
The embodiment of the present invention make use of -1 grade of light, and+1 light is first made to certain delay so that+1 grade of light and -1 phototiming, so
+ 1 grade of light is combined together with -1 grade of light by way of closing beam afterwards, -1 grade of light can so be used, energy is improved
Utilization rate, simultaneously in+1 grade of light and -1 grade of photosynthetic to one pulse, improves the pulse energy of laser.
Further, to make+1 grade of light be completely superposed with -1 grade of light in sequential, the dutycycle of driving power supply signal is set
For 50%, high level makes the pulse width of+1 grade of light consistent with -1 grade of light impulse length as low duration ,+1 grade
On sequential it is completely superposed with -1 grade of combiner and with -1 grade of light after light delay.
To enable time delay optical fiber 106 to allow the preset duration of+1 grade of light delay to allow+1 grade of light after follow-up delay to exist with -1 grade of light
Overlapped in sequential, the length of time delay optical fiber 106 is calculated by following formula：
L=t1*c
In formula, L represents the total length of time delay optical fiber 106, and unit is rice；T1 is that the driving power supply signal of acousto-optic modulator 10 is high
The duration of level, unit is the second；C is the speed that light is transmitted in a fiber.
Excessive space is occupied during the disk of time delay optical fiber 106 fibre to reduce, the disk fibre of time delay optical fiber 106 is shaped as oval ring
Or annular, and can allow time delay optical fiber 106 meet needed for fibre loss scope requirement.
The signal timing diagram of+1 grade of light after Fig. 5 is delayed for increase, as seen from Figure 5 ,+1 grade of light and -1 grade of light after delay
It is+1 grade of optical pulse energy and the conjunction beam of -1 grade of optical pulse energy sum to close beam by the bundling device 107 and export pulse energy
Light, can substantially be considered that original pulse energy increases one times, be the pulse got up of+1 grade of light and -1 grade of optical superposition
Energy.
In another embodiment, it is specially by time delay optical fiber that the bundling device 107, which closes -1 grade of light of beam with+1 grade of light after delay,
106 with transmission -1 grade of light the fused biconical taper of -1 grade of optical fiber 109, then cut-out and with the welding of output optical fibre 110；Can certainly
By -1 grade of welding of optical fiber 109 in the side of time delay optical fiber 106；Or by the welding of time delay optical fiber 106 in the side of -1 grade of optical fiber 109
Face, the embodiment of the present invention is without limitation.
In the present embodiment, the acousto-optic modulator 10 also includes driving power supply 103, controls the master control of driving power supply signal
Plate (not shown) and at least one the photodetector (not shown) being connected with the master control borad, at least one described photodetection
Device (not shown) is extended along a length thereof on direction located at above-mentioned weld and/or output optical fibre 110.Specifically, photodetector
Can be located at -1 grade of optical fiber 109 and the weld of time delay optical fiber 106, or extended along a length thereof located at output optical fibre 110 on direction,
Or be respectively provided with herein at two.The light path situation that photodetector can be used in detection bundling device 107, photodetector collection
Optical signal value can be used for judging -1 grade of light and the uniformity and gentle property of the combined beam light of+1 grade of light after delay, and -1 grade of light is judged accordingly
With+1 grade after delay it is just no overlap situation in sequential, to be completely superposed or partially overlapping, further judge weight
Conjunction degree.
Further, the master control borad is used for the optical signal value gathered according to the photodetector and default optical signal value
Comparative result adjust the driving power supply signal or outputting alarm signal.According to the error and time delay of permission, provide certain
Scope sets default optical signal value, it is also assumed that setting default optical signal value scope to be completely superposed with this.If photoelectricity is visited
The default optical signal value of optical signal value matching of device collection is surveyed, then master control borad controls driving power supply signal according to existing mode；
If the optical signal value of photodetector collection mismatches default optical signal value, further it is judged as that light path is abnormal or is not inconsistent simply
Close matching completely, i.e., when light path is normal, -1 grade of light with+1 grade after delay just the no situation that overlaps in sequential be to partially overlap
When, the driving power supply signal is adjusted according to its drift condition；If light path is abnormal, master control borad sends alarm signal, such as controls
Buzzer buzzing, or control light flash, or controlling pump source switch cut-out pumping source.
+ 1 grade of light is delayed by the embodiment of the present invention by time delay optical fiber, and by setting photoelectricity in the appropriate location of bundling device
Detector detects the conjunction beam situation of -1 grade of light and+1 grade of light after delay, controls to adjust the dutycycle of driving power supply signal, and formation is drawn
Enter time delay optical fiber to improve the feedback of acousto-optic modulator output optical pulse energy success or not, make the control to driving power supply signal
It is finer and accurate.And when photodetector detect light path it is abnormal when outputting alarm signal, cut-out pumping source switch is to protect immediately
Laser apparatus is protected, more intelligently.
Embodiment 2
Fig. 6 is the light path schematic diagram of laser of the embodiment of the present invention 200.Laser 200 is Q adjusting optical fiber laser, its light
Line structure is made up of four parts, and Part I is LD, i.e. pumping source 210, and it is used to provide the energy needed for one-level amplification；Second
It is divided into one-level amplification light path 220, is typically to be made up of one section of gain fibre, the pump light for pumping source 210 to be exported is converted to
Flashlight, while flashlight is amplified；Part III is acousto-optic modulator 230, for adjusting the width of pulse.3rd
It is divided into two grades of amplification light paths 240, for flashlight to be amplified again so that the energy of flashlight reaches certain energy value；The
Five parts are output optoisolator 250, for by signal light output, while completely cutting off the laser returned.The acousto-optic of the laser 200
Modulator 230 is identical with the acousto-optic modulator 10 described in above-described embodiment 1, will not be described in detail herein.
The acousto-optic modulator 230 for the laser 200 that the present embodiment is provided is phase with the acousto-optic modulator 10 of above-described embodiment 1
Same acousto-optic modulator, based on identical inventive concept, particular technique feature will not be described in detail herein.
The beneficial effect of embodiment of the present invention is：It is different from the situation of prior art, the laser of embodiment of the present invention
Device 200 includes acousto-optic modulator 230, and acousto-optic modulator 230 includes acousto-optic crsytal, the outgoing+1 successively of incident light beam strikes acousto-optic crsytal
Level light and -1 grade of light；Time delay optical fiber is connected so that+1 grade of light delay preset duration and with -1 in+1 grade of collimater exit direction
Level light is overlapped in sequential, and time delay optical fiber is all connected with after bundling device, -1 grade of light and delay+1 grade with -1 grade of collimater exit direction
It is+1 grade of optical pulse energy and the combined beam light of -1 grade of optical pulse energy sum that light, which closes beam by the bundling device and exports pulse energy,.
Thus, -1 grade of light, i.e., the light propagated by the original direction of propagation is also utilized, rather than is compromised, and improves energy
Conversion ratio and utilization rate.
In the present embodiment, the light path situation that photodetector can be used in detection bundling device, photodetector collection
Optical signal value can be used for judging -1 grade of light and the uniformity and gentle property of the combined beam light of+1 grade of light after delay, and -1 grade of light is judged accordingly
With+1 grade after delay it is just no overlap situation in sequential, to be completely superposed or partially overlapping, further judge weight
Conjunction degree.
Further, the master control borad is used for the optical signal value gathered according to the photodetector and default optical signal value
Comparative result adjust the driving power supply signal or outputting alarm signal.
+ 1 grade of light is delayed by the embodiment of the present invention by time delay optical fiber, and by setting photoelectricity in the appropriate location of bundling device
Detector detects the conjunction beam situation of -1 grade of light and+1 grade of light after delay, controls to adjust the dutycycle of driving power supply signal, and formation is drawn
Enter time delay optical fiber to improve the feedback of acousto-optic modulator output optical pulse energy success or not, make the control to driving power supply signal
It is finer and accurate.And when photodetector detect light path it is abnormal when outputting alarm signal, cut-out pumping source switch is to protect immediately
Laser apparatus is protected, more intelligently.
Embodiment 3
Fig. 7 is the flow chart for the method that the embodiment of the present invention improves acousto-optic modulator output light energy.As shown in fig. 7, carrying
In the method for high acousto-optic modulator light energy output amount, the acousto-optic modulator includes acousto-optic crsytal, and the acousto-optic modulator is also wrapped
Include -1 grade of collimater ,+1 grade of collimater, time delay optical fiber and bundling device；Methods described includes：
Step 301：Acousto-optic crsytal described in incident light beam strikes and respectively -1 grade of light of outgoing and+1 grade of light；
Step 302：- 1 grade of collimater receives -1 grade of light；+ 1 grade of collimater receives+1 grade of light；
Step 303：+ 1 grade of collimater exit direction connects the time delay optical fiber so that+1 grade of light delay preset duration
And overlapped with -1 grade of light in sequential, time delay optical fiber is all connected with bundling device, -1 grade of light and delay with -1 grade of collimater exit direction
+ 1 grade of light is closed beam by the bundling device and exported afterwards.
The method and the acousto-optic modulator of above-described embodiment 1 for the raising acousto-optic modulator output light energy that the present embodiment is provided
10 are based on identical inventive concept, the raising acousto-optic modulator light energy output that the present embodiment is provided with the laser 200 of embodiment 2
The acousto-optic modulator 10 of acousto-optic modulator and above-described embodiment 1 in the method for amount is identical acousto-optic modulator, particular technique
Feature will not be described in detail herein.
Further, it is specially by -1 grade of time delay optical fiber and transmission that the bundling device, which closes -1 grade of light of beam with+1 grade of light after delay,
- 1 grade of optical fiber fused tapering of light and with output optical fibre welding；The acousto-optic modulator includes driving power supply, control driving power supply
The master control borad of signal and at least one photodetector being connected with the master control borad, at least one described photodetector are located at
Weld and/or output optical fibre are extended along a length thereof on direction, and the master control borad is used for what is gathered according to the photodetector
The comparative result of optical signal value and default optical signal value adjusts the driving power supply signal.
The beneficial effect of embodiment of the present invention is：It is different from the situation of prior art, the raising of embodiment of the present invention
In the method for acousto-optic modulator output light energy, acousto-optic modulator includes acousto-optic crsytal, and incident light beam strikes acousto-optic crsytal goes out successively
Penetrate+1 grade of light and -1 grade of light；Time delay optical fiber is connected in+1 grade of collimater exit direction so that+1 grade of light is delayed preset duration simultaneously
Overlapped with -1 grade of light in sequential, time delay optical fiber and -1 grade of collimater exit direction are all connected with bundling device, -1 grade of light with after delay+
It is+1 grade of optical pulse energy and the conjunction beam of -1 grade of optical pulse energy sum that 1 grade of light, which closes beam by the bundling device and exports pulse energy,
Light.Thus, -1 grade of light, i.e., the light propagated by the original direction of propagation is also utilized, rather than is compromised, and improves energy
Measure conversion ratio and utilization rate.
In the present embodiment, the light path situation that photodetector can be used in detection bundling device, photodetector collection
Optical signal value can be used for judging -1 grade of light and the uniformity and gentle property of the combined beam light of+1 grade of light after delay, and -1 grade of light is judged accordingly
With+1 grade after delay it is just no overlap situation in sequential, to be completely superposed or partially overlapping, further judge weight
Conjunction degree.
Further, the master control borad is used for the optical signal value gathered according to the photodetector and default optical signal value
Comparative result adjust the driving power supply signal or outputting alarm signal.
+ 1 grade of light is delayed by the embodiment of the present invention by time delay optical fiber, and by setting photoelectricity in the appropriate location of bundling device
Detector detects the conjunction beam situation of -1 grade of light and+1 grade of light after delay, controls to adjust the dutycycle of driving power supply signal, and formation is drawn
Enter time delay optical fiber to improve the feedback of acousto-optic modulator output optical pulse energy success or not, make the control to driving power supply signal
It is finer and accurate.And when photodetector detect light path it is abnormal when outputting alarm signal, cut-out pumping source switch is to protect immediately
Laser apparatus is protected, more intelligently.
Embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, is included within the scope of the present invention.
Claims (12)
1. acousto-optic modulator, including acousto-optic crsytal, it is characterised in that incident light beam strikes acousto-optic crsytal+1 grade of light of outgoing and -1 successively
Level light；The acousto-optic modulator also includes+1 grade of collimater for receiving+1 grade of light of -1 grade of collimater and reception of -1 grade of light, institute
+ 1 grade of collimater exit direction connection time delay optical fiber is stated so as to+1 grade of light delay preset duration and be overlapped with -1 grade of light in sequential,
Time delay optical fiber is all connected with bundling device with -1 grade of collimater exit direction, and -1 grade of light closes beam with+1 grade of light after delay by the bundling device
And export.
2. acousto-optic modulator according to claim 1, it is characterised in that the bundling device closes -1 grade of light of beam and after delay+1
Level light be specially by time delay optical fiber with transmission -1 grade of light -1 grade of optical fiber fused tapering and with output optical fibre welding；
The acousto-optic modulator also includes driving power supply, controls the master control borad of driving power supply signal and be connected with the master control borad
At least one photodetector, at least one described photodetector is extended along a length thereof located at weld and/or output optical fibre
On direction.
3. acousto-optic modulator according to claim 2, it is characterised in that the master control borad is used for according to the photodetection
The optical signal value of device collection adjusts the driving power supply signal or outputting alarm signal with the comparative result of default optical signal value.
4. the acousto-optic modulator according to claim any one of 1-3, it is characterised in that the incident light is entered with Bragg angle
Penetrate the acousto-optic crsytal；- 1 grade of light is the light that incident light presses incident light direction outgoing through the acousto-optic crsytal, described+1 grade
Light is the Bragg diffraction light that incident light occurs through the acousto-optic crsytal；
The length of the time delay optical fiber is calculated by following formula：
L=t1*c
In formula, L represents the total length of time delay optical fiber；T1 is the duration of Acousto-Optic Modulator Driver signal high level；C is
The speed that light is transmitted in a fiber.
5. acousto-optic modulator according to claim 4, it is characterised in that the dutycycle of the driving power supply signal is
50%.
6. the acousto-optic modulator according to claim any one of 1-3, it is characterised in that the fine shape of the disk of the time delay optical fiber
For oval ring or annular.
7. acousto-optic modulator according to claim 6, it is characterised in that the acousto-optic modulator also includes being the delay
Stopper slot is set on the heat-radiating substrate of light radiating, the heat-radiating substrate, and the time delay optical fiber is embedded in the stopper slot and by it
It is fixed.
8. laser, including the acousto-optic modulator as described in claim any one of 1-7.
9. laser according to claim 8, it is characterised in that the laser also includes one-level and amplifies light path and institute
State pumping source and the acousto-optic modulator that one-level amplification light path connects and amplifies energy needed for light path provides one-level amplification for one-level
Two grades of amplification light paths and amplify light path outlet sides with described two grades that signal light output side connects and amplifies flashlight again
The output optoisolator of connection.
10. improving the method for acousto-optic modulator output light energy, the acousto-optic modulator includes acousto-optic crsytal, it is characterised in that
The acousto-optic modulator also includes -1 grade of collimater ,+1 grade of collimater, time delay optical fiber and bundling device；Methods described includes：
Acousto-optic crsytal described in incident light beam strikes and respectively -1 grade of light of outgoing and+1 grade of light；
- 1 grade of collimater receives -1 grade of light；+ 1 grade of collimater receives+1 grade of light；
+ 1 grade of collimater exit direction connects the time delay optical fiber so as to+1 grade of light delay preset duration and exist with -1 grade of light
Overlapped in sequential, time delay optical fiber is all connected with bundling device with -1 grade of collimater exit direction, and -1 grade of light is with+1 grade of light after delay by institute
Bundling device is stated to close beam and export.
11. method according to claim 10, it is characterised in that the bundling device closes -1 grade of light of beam and+1 grade of light after delay
Specially by time delay optical fiber with transmission -1 grade of light -1 grade of optical fiber fused tapering and with output optical fibre welding；
The acousto-optic modulator also includes driving power supply, controls the master control borad of driving power supply signal and be connected with the master control borad
At least one photodetector, at least one described photodetector is extended along a length thereof located at weld and/or output optical fibre
On direction.
12. method according to claim 11, it is characterised in that the master control borad is used to be adopted according to the photodetector
The comparative result of the optical signal value of collection and default optical signal value adjusts the driving power supply signal or outputting alarm signal.
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