CN107092105B - 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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- CN107092105B CN107092105B CN201710356771.8A CN201710356771A CN107092105B CN 107092105 B CN107092105 B CN 107092105B CN 201710356771 A CN201710356771 A CN 201710356771A CN 107092105 B CN107092105 B CN 107092105B
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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
Abstract
The method and laser that embodiment of the present invention discloses acousto-optic modulator, improves acousto-optic modulator output light energy, acousto-optic modulator includes acousto-optic crsytal, and incident light beam strikes acousto-optic crsytal is emitted+1 grade of light and 1 grade of light successively；Time delay optical fiber is connected in+1 grade of collimator exit direction so as to+1 grade of light delay preset duration and be overlapped in sequential with 1 grade of light, time delay optical fiber is all connected with bundling device with 1 grade of collimator exit direction, and 1 grade of light closes beam by the bundling device with+1 grade of light after delay and exports.1 grade of light as a result, i.e., the light propagated by the original direction of propagation is also utilized, rather than is compromised, and energy conversion rate and utilization rate are improved.
Description
Technical field
Embodiment of the present invention is related to field of laser device technology, more particularly to acousto-optic modulator, improves 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.
It in Q adjusting optical fiber laser, has the following problems, merely with the Bragg diffraction light occurred through acousto-optic modulator, presses
The light that the direction of propagation (incident direction) originally is propagated is not utilized, but is compromised, therefore causes energy dissipation.
Invention content
The present invention is utilized Bragg diffraction light but has revealed and propagated by the original direction of propagation for the prior art
Light, and the technical issues of cause energy dissipation, provide acousto-optic modulator, improve acousto-optic modulator output light energy method and
Laser.
In order to solve the above technical problems, the technical solution that embodiment of the present invention uses is：Acousto-optic modulator is provided,
Including acousto-optic crsytal, incident light beam strikes acousto-optic crsytal is emitted+1 grade of light and -1 grade of light successively；The acousto-optic modulator further includes connecing
Receive+1 grade of collimator of+1 grade of light of -1 grade of collimator and reception of -1 grade of light ,+1 grade of collimator 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 collimator exit direction
It is all connected with bundling device, -1 grade of light closes beam by the bundling device with+1 grade of light after delay and exports.
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 further includes driving power, controls the master control borad of driving power signal and connect with the master control borad
At least one photodetector connect, at least one photodetector are set to weld and/or output optical fibre along its length
On extending direction.
Wherein, the ratio for the optical signal value and default optical signal value that the master control borad is used to be acquired according to the photodetector
Relatively result adjusts the driving power 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 indicates the total length of time delay optical fiber；T1 be Acousto-Optic Modulator Driver signal high level it is lasting when
Between；C is the speed that light transmits in a fiber.
Wherein, the duty ratio of the driving power signal is 50%.
Wherein, the disk fibre shape of the time delay optical fiber is oval ring or circular ring shape.
Wherein, the acousto-optic modulator further includes the heat-radiating substrate for the delay light heat dissipation, on the heat-radiating substrate
Limiting slot is set, and the time delay optical fiber is embedded in the limiting slot and is secured by it.
In order to solve the above technical problems, another technical solution that embodiment of the present invention uses is：Laser, packet are provided
Include above-mentioned acousto-optic modulator.
Wherein, the laser further includes level-one amplification light path, is connect with level-one amplification light path and is level-one amplification
Light path the pumping source of energy needed for level-one amplification is provided, is connect with the acousto-optic modulator signal light output side and by signal light again
The two level amplification light path of amplification and the output optoisolator being connect with two level amplification optical output side.
In order to solve the above technical problems, another technical solution that embodiment of the present invention uses is：It provides and improves acousto-optic
The method of modulator output light energy, the acousto-optic modulator include acousto-optic crsytal, and the acousto-optic modulator further includes -1 grade of standard
Straight device ,+1 grade of collimator, time delay optical fiber and bundling device；The method includes：
Acousto-optic crsytal described in incident light beam strikes is simultaneously emitted -1 grade of light and+1 grade of light respectively；
- 1 grade of collimator receives -1 grade of light；+ 1 grade of collimator receives+1 grade of light；
+ 1 grade of collimator exit direction connect the time delay optical fiber so that+1 grade of light delay preset duration and with -1 grade
Light overlaps 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 collimator 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 further includes driving power, controls the master control borad of driving power signal and connect with the master control borad
At least one photodetector connect, at least one photodetector are set to weld and/or output optical fibre along its length
On extending direction.
Wherein, the ratio for the optical signal value and default optical signal value that the master control borad is used to be acquired according to the photodetector
Relatively result adjusts the driving power signal or outputting alarm signal.
The advantageous effect of embodiment of the present invention is：The case where being different from the prior art, the acousto-optic of embodiment of the present invention
Modulator includes acousto-optic crsytal, and incident light beam strikes acousto-optic crsytal is emitted+1 grade of light and -1 grade of light successively；In+1 grade of collimator
Exit direction connects time delay optical fiber so as to+1 grade of light delay preset duration and be overlapped in sequential with -1 grade of light, time delay optical fiber and -1
Grade collimator 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 exports.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.
Description of the drawings
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element with same reference numbers label is expressed as similar element in attached drawing, removes
Non- to have special statement, composition does not limit the figure in attached 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.
Specific implementation mode
The present invention is described in further details below by way of the drawings and specific embodiments.
To facilitate the understanding of 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, technical and scientific term all used in this specification and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to retouch in the description of the invention in this specification
The purpose for stating specific embodiment is not intended to the limitation present invention.
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 that acousto-optic is brilliant
Body 101, PZT (piezoelectric transducer) 102 and driving power 103.The electric signal of driving power 103 drives PZT (piezoelectric transducer), 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 variation, formed grating.At this moment if when incident light passes through acousto-optic crsytal with Bragg angle θ B, it may occur that diffraction so that light
Deviation occurs, deviates the original direction of propagation, it is+1 grade of light that deviation, which occurs,.When acousto-optic modulator does not have pulse signal, i.e.,
When pulse signal low level, acousto-optic crsytal refractive index will not change, and light can be propagated by the original direction of propagation, be -1
Grade light, as incident light press the light of incident light direction outgoing through the acousto-optic crsytal.
Sequential relationship between driving power signal ,+1 grade of optical signal, -1 grade of optical signal, laser output optical signal is as schemed
Shown in 2.As shown in Fig. 2, driving power signal high level generates+1 grade of optical signal, driving power signal low level generates -1 grade of light
Signal, laser output optical signal and driving power signal high level ,+1 grade of optical signal are consistent in sequential.
Fig. 3 and Fig. 4 is 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 108 incidence acousto-optic crsytal 101 of incident collimator
Penetrate+1 grade of light and -1 grade of light；The acousto-optic modulator 10 further includes+1 grade of -1 grade of collimator 104 and reception for receiving -1 grade of light
+ 1 grade of collimator 105 of light, 105 exit direction of+1 grade of collimator connection time delay optical fiber 106 is 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 104 exit direction of collimator
107, -1 grade of light closes beam by the bundling device 107 with+1 grade of light after delay and exports.
As shown in figure 3, being incident on acousto-optic crsytal 101 with Bragg angle θ B by the incident light of incident collimator 108, go out
It penetrates light to be received with two collimators 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 grade optical collimator 104 is at an angle of size with the axial direction of acousto-optic crsytal 101 respectively.
- 1 grade of light is utilized in the embodiment of the present invention, 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 by way of closing beam with -1 grade of light afterwards, -1 grade of light can be used in this way, improve energy
Utilization rate improves the pulse energy of laser simultaneously in+1 grade of light and -1 grade of photosynthetic to one pulse.
Further, to make+1 grade of light be completely superposed in sequential with -1 grade of light, the duty ratio of driving power signal is arranged
It is 50%, high level keeps the pulse width of+1 grade of light consistent with -1 grade of light impulse length as low duration ,+1 grade
It is completely superposed in sequential with -1 grade of combiner and with -1 grade of light after light delay.
To enable the preset duration that time delay optical fiber 106 allows+1 grade of light to be delayed that+1 grade of light after subsequent delay to be allowed to exist with -1 grade of light
It is overlapped in sequential, the length of time delay optical fiber 106 is calculated by following formula：
L=t1*c
In formula, L indicates the total length of time delay optical fiber 106, and unit is rice；T1 is that 10 driving power signal of acousto-optic modulator is high
The duration of level, unit are the second；C is the speed that light transmits in a fiber.
Excessive space is occupied when 106 disk fibre of time delay optical fiber to reduce, is oval ring by the disk fibre shape of time delay optical fiber 106
Or circular ring shape, and time delay optical fiber 106 can be allowed to meet the requirement of required fibre loss range.
Fig. 5 is the signal timing diagram of+1 grade of light after increasing delay, as seen from Figure 5 ,+1 grade of light and -1 grade of light after delay
Beam is closed by the bundling device 107 and exports the conjunction beam that pulse energy is the sum of+1 grade of optical pulse energy and -1 grade of optical pulse energy
Light can substantially be considered that original pulse energy increases one times, be the pulse of+1 grade of light and -1 grade of optical superposition got up
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 109 fused biconical taper of -1 grade of optical fiber, then cut-out and with 110 welding of output optical fibre；It can certainly
By -1 grade of 109 welding of optical fiber in the side of time delay optical fiber 106；Or by 106 welding of time delay optical fiber in the side of -1 grade of optical fiber 109
Face, the embodiment of the present invention are without limitation.
In the present embodiment, the acousto-optic modulator 10 further includes driving power 103, controls the master control of driving power signal
Plate (not shown) and at least one photodetector (not shown) being connect with the master control borad, at least one photodetection
Device (not shown) is set to above-mentioned weld and/or output optical fibre 110 extends along a length thereof on direction.Specifically, photodetector
It can be set to the weld of -1 grade of optical fiber 109 and time delay optical fiber 106, or be extended along a length thereof on direction set on output optical fibre 110,
Or it is respectively provided at two herein.Photodetector can be used for detecting the light path situation in bundling device 107, photodetector acquisition
Optical signal value can be used for judging -1 grade of light and the uniformity of the combined beam light of+1 grade of light and gentle property after delay, judge -1 grade of light 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 optical signal value and default optical signal value that the master control borad is used to be acquired according to the photodetector
Comparison result adjust the driving power signal or outputting alarm signal.According to the error and time delay of permission, provide certain
It is ranging from completely superposed, default optical signal value is set with this, it is also assumed that setting default optical signal value range.If photoelectricity is visited
Optical signal value is preset in the optical signal value matching for surveying device acquisition, then master control borad controls driving power signal according to existing mode；
If the optical signal value of photodetector acquisition, which mismatches, presets optical signal value, further it is judged as that light path is abnormal or is not inconsistent only
Conjunction exactly matches, 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 signal is adjusted according to its drift condition；If light path is abnormal, master control borad sends out alarm signal, such as controls
Buzzer buzzing, or control light flash, or control pumping source switch cutoff pumping source.
+ 1 grade of light is delayed by the embodiment of the present invention by time delay optical fiber, and by the way that photoelectricity is arranged 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 duty ratio of driving power 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, makes the control to driving power signal
It is finer and accurate.And the outputting alarm signal when photodetector detects light path exception, pumping source switch is cut off immediately to protect
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, light
Line structure is made of four parts, and first part is LD, i.e. pumping source 210, it is used to provide the energy needed for level-one amplification；Second
It is divided into level-one amplification light path 220, is typically made of one section of gain fibre, the pump light for exporting pumping source 210 is converted to
Signal light, while signal light being amplified；Part III is acousto-optic modulator 230, for adjusting the width of pulse.Third portion
It is divided into two level amplification light path 240, for amplifying signal light again so that the energy of signal light reaches certain energy value；The
Five parts are output optoisolator 250, are used for signal light output, while completely cutting off the laser of return.The acousto-optic of the laser 200
Modulator 230 is identical as the acousto-optic modulator 10 described in above-described embodiment 1, and this will not be detailed here.
The acousto-optic modulator 230 of laser 200 provided in this embodiment is phase with the acousto-optic modulator 10 of above-described embodiment 1
Same acousto-optic modulator is based on identical inventive concept, and this will not be detailed here for particular technique feature.
The advantageous effect of embodiment of the present invention is：The case where being different from the 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, and incident light beam strikes acousto-optic crsytal is emitted+1 successively
Grade 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 collimator exit direction
Grade light overlaps in sequential, and time delay optical fiber and -1 grade of collimator exit direction are all connected with bundling device, -1 grade of light with+1 grade after delay
Light closes beam by the bundling device and exports the combined beam light that pulse energy is the sum of+1 grade of optical pulse energy and -1 grade of optical pulse energy.
- 1 grade of light as a result, i.e., the light propagated by the original direction of propagation is also utilized, rather than is compromised, and energy is improved
Conversion ratio and utilization rate.
In the present embodiment, photodetector can be used for detecting the light path situation in bundling device, photodetector acquisition
Optical signal value can be used for judging -1 grade of light and the uniformity of the combined beam light of+1 grade of light and gentle property after delay, judge -1 grade of light 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 optical signal value and default optical signal value that the master control borad is used to be acquired according to the photodetector
Comparison result adjust the driving power 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 the way that photoelectricity is arranged 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 duty ratio of driving power 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, makes the control to driving power signal
It is finer and accurate.And the outputting alarm signal when photodetector detects light path exception, pumping source switch is cut off immediately to protect
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 also wraps
Include -1 grade of collimator ,+1 grade of collimator, time delay optical fiber and bundling device；The method includes：
Step 301：Acousto-optic crsytal described in incident light beam strikes is simultaneously emitted -1 grade of light and+1 grade of light respectively；
Step 302：- 1 grade of collimator receives -1 grade of light；+ 1 grade of collimator receives+1 grade of light；
Step 303：Preset duration that+1 grade of collimator exit direction connects the time delay optical fiber so that+1 grade of light is delayed
And overlapped in sequential with -1 grade of light, time delay optical fiber is all connected with bundling device, -1 grade of light and delay with -1 grade of collimator exit direction
+ 1 grade of light is closed beam by the bundling device and is exported afterwards.
The acousto-optic modulator of the method and above-described embodiment 1 provided in this embodiment for improving acousto-optic modulator output light energy
10 are based on identical inventive concept, raising acousto-optic modulator light energy output provided in this embodiment 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
This will not be detailed here for feature.
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, control driving power
The master control borad of signal and at least one photodetector being connect with the master control borad, at least one photodetector are set to
Weld and/or output optical fibre extend along a length thereof on direction, what the master control borad was used to be acquired according to the photodetector
The comparison result of optical signal value and default optical signal value adjusts the driving power signal.
The advantageous effect of embodiment of the present invention is：The case where being different from the 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 collimator exit direction so that+1 grade of light is delayed preset duration simultaneously
Overlapped in sequential with -1 grade of light, time delay optical fiber and -1 grade of collimator exit direction are all connected with bundling device, -1 grade of light with after delay+
1 grade of light closes beam by the bundling device and exports the conjunction beam that pulse energy is the sum of+1 grade of optical pulse energy and -1 grade of optical pulse energy
Light.- 1 grade of light as a result, i.e., the light propagated by the original direction of propagation is also utilized, rather than is compromised, and energy is improved
Measure conversion ratio and utilization rate.
In the present embodiment, photodetector can be used for detecting the light path situation in bundling device, photodetector acquisition
Optical signal value can be used for judging -1 grade of light and the uniformity of the combined beam light of+1 grade of light and gentle property after delay, judge -1 grade of light 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 optical signal value and default optical signal value that the master control borad is used to be acquired according to the photodetector
Comparison result adjust the driving power 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 the way that photoelectricity is arranged 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 duty ratio of driving power 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, makes the control to driving power signal
It is finer and accurate.And the outputting alarm signal when photodetector detects light path exception, pumping source switch is cut off immediately to protect
Laser apparatus is protected, more intelligently.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (14)
1. acousto-optic modulator, including acousto-optic crsytal, which is characterized in that incident light beam strikes acousto-optic crsytal is emitted+1 grade of light and -1 successively
Grade light；The acousto-optic modulator further includes+1 grade of collimator of+1 grade of light of -1 grade of collimator and reception for receiving -1 grade of light, institute
It is angled with the axial direction of the acousto-optic crsytal respectively to state+1 grade of collimator and -1 grade of collimator, and angular dimension is all Bragg angle
θ B ,+1 grade of collimator exit direction connection time delay optical fiber so that+1 grade of light delay preset duration and with -1 grade of light in sequential
It overlaps, time delay optical fiber is all connected with bundling device with -1 grade of collimator exit direction, and -1 grade of light is with+1 grade of light after delay by the conjunction beam
Device closes beam and exports.
2. acousto-optic modulator according to claim 1, which is characterized in that the bundling device closes -1 grade of light of beam and after delay+1
Grade 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 further includes driving power, controls the master control borad of driving power signal and connect with the master control borad
At least one photodetector, at least one photodetector is set to weld or output optical fibre extends along a length thereof direction
On.
3. acousto-optic modulator according to claim 1, which is characterized in that the bundling device closes -1 grade of light of beam and after delay+1
Grade 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 further includes driving power, controls the master control borad of driving power signal and connect with the master control borad
Two photodetectors, described two photodetectors are respectively arranged on weld and output optical fibre extends along a length thereof on direction.
4. acousto-optic modulator according to claim 2, which is characterized in that the master control borad is used for according to the photodetection
The optical signal value of device acquisition adjusts the driving power signal or outputting alarm signal with the comparison result of default optical signal value.
5. according to claim 1-4 any one of them acousto-optic modulators, which is characterized in that the incident light is entered with Bragg angle
Penetrate the acousto-optic crsytal；The light that -1 grade of light is emitted through the acousto-optic crsytal by incident light direction for incident light, 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 indicates 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 transmits in a fiber.
6. acousto-optic modulator according to claim 5, which is characterized in that the duty ratio of the driving power signal is
50%.
7. according to claim 1-4 any one of them acousto-optic modulators, which is characterized in that the disk fibre shape of the time delay optical fiber
For oval ring or circular ring shape.
8. acousto-optic modulator according to claim 7, which is characterized in that the acousto-optic modulator further includes for the delay
The heat-radiating substrate of light heat dissipation, limiting slot is arranged on the heat-radiating substrate, and the time delay optical fiber is embedded in the limiting slot and by it
It is fixed.
9. laser, including such as claim 1-8 any one of them acousto-optic modulators.
10. laser according to claim 9, which is characterized in that the laser further includes level-one amplification light path and institute
Level-one amplification light path is stated to connect and provide the pumping source of energy and the acousto-optic modulator needed for level-one amplification for level-one amplification light path
Signal light output side connects and the two level for amplifying signal light again amplifies light path and amplifies optical output side with the two level
The output optoisolator of connection.
11. the method for improving acousto-optic modulator output light energy, the acousto-optic modulator includes acousto-optic crsytal, which is characterized in that
The acousto-optic modulator further includes -1 grade of collimator ,+1 grade of collimator, time delay optical fiber and bundling device；The method includes：
Acousto-optic crsytal described in incident light beam strikes is simultaneously emitted -1 grade of light and+1 grade of light respectively；
- 1 grade of collimator receives -1 grade of light；+ 1 grade of collimator receives+1 grade of light；+ 1 grade of collimator and -1 grade of standard
Straight device is angled with the axial direction of the acousto-optic crsytal respectively, and angular dimension is all Bragg angle θ B；
+ 1 grade of collimator 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
It is overlapped in sequential, time delay optical fiber is all connected with bundling device with -1 grade of collimator 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.
12. according to the method for claim 11, which is characterized 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 further includes driving power, controls the master control borad of driving power signal and connect with the master control borad
At least one photodetector, at least one photodetector is set to weld or output optical fibre extends along a length thereof direction
On.
13. according to the method for claim 11, which is characterized 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 further includes driving power, controls the master control borad of driving power signal and connect with the master control borad
Two photodetectors, described two photodetectors are respectively arranged on weld and output optical fibre extends along a length thereof on direction.
14. method according to claim 12 or 13, which is characterized in that the master control borad is used for according to the photodetection
The optical signal value of device acquisition adjusts the driving power signal or outputting alarm signal with the comparison result of default optical signal value.
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| BE1007876A4 (en) * | 1993-12-17 | 1995-11-07 | Philips Electronics Nv | Radiation source unit for generating a bundle with two polarization directions and two rates. |
| JP2000162561A (en) * | 1998-06-02 | 2000-06-16 | Nippon Telegr & Teleph Corp <Ntt> | Light subcarrier phase modulator and optical spectrum spread transmitter using same |
| WO2000052520A1 (en) * | 1999-03-03 | 2000-09-08 | Haas-Laser Gmbh + Co. Kg | Optical modulation device |
| JP2004029152A (en) * | 2002-06-21 | 2004-01-29 | Toshiba Corp | Optical fiber light incidence method and device |
| CN103811989B (en) * | 2014-01-24 | 2015-07-29 | 深圳市创鑫激光股份有限公司 | For the coupling fiber acoustooptic Q-switching of high power pulse optical fiber |
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| CN104600555B (en) * | 2015-01-21 | 2017-10-17 | 中国航空工业集团公司北京长城计量测试技术研究所 | Dynamic sound-light modulates the system of selection of optical frequency level and device |
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