CN209001334U - A kind of acousto-optic beam splitter of two-stage O_3-BAC, multichannel and multi-cascade - Google Patents
A kind of acousto-optic beam splitter of two-stage O_3-BAC, multichannel and multi-cascade Download PDFInfo
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- CN209001334U CN209001334U CN201821199555.3U CN201821199555U CN209001334U CN 209001334 U CN209001334 U CN 209001334U CN 201821199555 U CN201821199555 U CN 201821199555U CN 209001334 U CN209001334 U CN 209001334U
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Abstract
The utility model relates to photoelectron and laser technologies, and in particular to the acousto-optic beam splitter of a kind of two-stage O_3-BAC, multichannel and multi-cascade, including first order acousto-optic modulation module, first the first acousto-optic modulation module of cascade, the first cascade rising tone optical modulator module；Laser beam is with Bragg diffraction angle θBIncident first order acousto-optic modulation module, first order acousto-optic modulation module project 0 grade of Bragg diffraction light and+1 grade or -1 grade of Bragg diffraction light；The first cascade rising tone optical modulator module is placed in 0 grade of Bragg diffraction light direction of first order acousto-optic modulation module, first the first acousto-optic modulation module of cascade is placed in+1 grade of first order acousto-optic modulation module or -1 grade of Bragg diffraction light direction, the diffraction light of acousto-optic modulation module is with Bragg diffraction angle θBIncident next cascade acousto-optic modulation module.For the acousto-optic beam splitter while realizing that single pulse energy is constant, repetition rate reduces, light-source structure is more compact, strong antijamming capability, improves the utilization rate of acousto-optic modulation module laser.
Description
Technical field
The utility model belong to photoelectron and laser technology field more particularly to a kind of two-stage O_3-BAC, multichannel and
The acousto-optic beam splitter of multi-cascade.
Background technique
Acousto-optic beam splitter is the acousto-optic Bragg diffraction using acousto-optic modulator (AOM), changes the load of injection ultrasonic field
Light beam is divided into the Optical devices of two-beam by the period.
Optical beam-splitter is a kind of pure position phase diffraction optical element, and beam of laser can be converted into the light of even intensity by it
Beam array also has the function of that multiple imaging, light network, optical coupling and light beam are compound etc..With optical Information Processing, optical communication
With the further investigation in optical oomputing field, optical beam-splitter using increasingly extensive.
With the development of science and technology, the light beam splitting technology based on acousto-optic modulator has been widely used in all trades and professions, with
Acousto-optic processing technique based on acousto-optical device has broad application prospects in terms of modern communications and military radar.It has
With roomy, capacity is big, processing gain is high, can real-time parallel processing the features such as, be usually used in extracting small-signal and integrate light with separating
Beam etc..Since the acousto-optic modulation measurement that acousto-optic beam splitting technology utilizes is non-cpntact measurement, it has precision height, adaptability
The advantages that good, non-contact, have broad application prospects it in terms of measurement.
Existing laser beam beam splitter has the mode of optical element beam splitting, the method using raster beam-splitting, fiber beam splitting
Mode etc., however there is a degree of deficiency.For example, the laser energy ratio of institute's beam splitting can not adjust at any time, flexibly
Property is poor；The repetition rate of pulse cannot be implemented to adjust, not the function of frequency reducing.However, with a picosecond mode-locked laser industry
The continuous improvement of change degree, the requirement to laser energy beam splitting is also increasingly harsher, and separated laser energy is not only needed to connect
Continue repetition rate that is adjustable, and can arbitrarily adjusting the pulse of output laser, therefore, laser beam beam splitting dress traditional at present
It sets, is unable to satisfy requirement of the picosecond laser light source to laser light source beam splitting.
Utility model content
The purpose of the utility model is to provide a kind of acousto-optics that laser output beam splitting frequency reducing is realized using acousto-optic modulation module
Beam splitter.
A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: acousto-optic beam splitter of two-stage O_3-BAC, packet
Include laser beam；Including first order acousto-optic modulation module, first the first acousto-optic modulation module of cascade, the first cascade rising tone light tune
Molding block and radio-frequency driven power supply, LN PZT (piezoelectric transducer) and acoustic optic interaction medium；Laser beam is with Bragg diffraction angle θB
Incident first order acousto-optic modulation module, first order acousto-optic modulation module project 0 grade of Bragg diffraction light and+1 grade or -1 grade of Bradley
Lattice diffraction light；The first cascade rising tone light modulation mould is placed in 0 grade of Bragg diffraction light direction of first order acousto-optic modulation module
Block, 0 grade of Bragg diffraction light of first order acousto-optic modulation module is with Bragg diffraction angle θBIncidence first cascades rising tone light tune
Molding block；First the first acousto-optic tune of cascade is placed in+1 grade of first order acousto-optic modulation module or -1 grade of Bragg diffraction light direction
Molding block ,+1 grade of first order acousto-optic modulation module or -1 grade of Bragg diffraction light are with Bragg diffraction angle θBIncidence first cascades
First acousto-optic modulation module；Wherein, line between first the first acousto-optic module of cascade and the first cascade rising tone optical modulator module
Angle be 2 θB。
In the acousto-optic beam splitter of above-mentioned two-stage O_3-BAC, laser beam uses repetition rate for f, and pulse energy is E's
Laser beam；Acoustic optic interaction medium uses fused quartz or tellurium oxide, and is coated with anti-reflection film.
A kind of multiple channel acousto beam splitter, including laser beam；Including first order acousto-optic modulation module, the first cascade first
Acousto-optic modulation module, the first cascade rising tone optical modulator module ... ... N cascade the first acousto-optic modulation module, N cascade second
Acousto-optic modulation module, radio-frequency driven power supply, LN PZT (piezoelectric transducer), acoustic optic interaction medium；Laser beam is with Bragg diffraction angle
θBIncident first order acousto-optic modulation module places the first order in 0 grade of Bragg diffraction light direction of first order acousto-optic modulation module
Join rising tone optical modulator module, 0 grade of Bragg diffraction light of first order acousto-optic modulation module is with Bragg diffraction angle θBIncident the
One cascade rising tone optical modulator module；The is placed in+1 grade of first order acousto-optic modulation module or -1 grade of Bragg diffraction light direction
One the first acousto-optic modulation module of cascade ,+1 grade of first order acousto-optic modulation module or -1 grade of Bragg diffraction light are with Bragg diffraction
Angle θBIncidence first cascades the first acousto-optic modulation module；Wherein, first the first acousto-optic module of cascade and the first cascade rising tone light
The angle of line is 2 θ between modulation moduleB；... the cascade first acousto-optic modulation module of N and rising tone optical modulator module point
It is not placed in 0 grade of Bragg diffraction light of the first acousto-optic modulation module and+1 grade or -1 grade of Prague of the first acousto-optic modulation module
On the extended line of diffraction light direction, N-1 cascades 0 grade of Bragg diffraction light of the first acousto-optic modulation module with Bragg diffraction angle
θBIncident N grade the first acousto-optic modulation modules of cascade, 0 grade of Bragg diffraction light of N-1 cascade rising tone optical modulator module with
Bragg diffraction angle θBIncidence N cascades rising tone optical modulator module, and N cascades the first acousto-optic module and N cascade second
The angle of line is 2 θ between acousto-optic modulation moduleB；Wherein, N is natural number.
In above-mentioned multiple channel acousto beam splitter, laser beam uses repetition rate for f, and pulse energy is the laser of E
Light beam；Acoustic optic interaction medium uses fused quartz or tellurium oxide, and is coated with anti-reflection film.
A kind of multi-cascade acousto-optic beam splitter, including laser beam；Including first order acousto-optic modulation module, the first cascade first
Acousto-optic modulation module, the first cascade rising tone optical modulator module ... ... N cascade the first acousto-optic modulation module, N cascade second
Acousto-optic modulation module ... ... N cascade the 2ndNAcousto-optic modulation module, radio-frequency driven power supply, LN PZT (piezoelectric transducer), acoustic optic interaction
Medium；Laser beam is with Bragg diffraction angle θBIncident first order acousto-optic modulation module, first order acousto-optic modulation module project 0 grade
Bragg diffraction light and+1 grade or -1 grade of Bragg diffraction light；In 0 grade of Bragg diffraction light side of first order acousto-optic modulation module
Rising tone optical modulator module is cascaded to placement first, 0 grade of Bragg diffraction light of first order acousto-optic modulation module is spread out with Prague
Firing angle θBIncidence first cascades rising tone optical modulator module；In+1 grade or -1 grade of Bragg diffraction of first order acousto-optic modulation module
Light direction places first the first acousto-optic modulation module of cascade ,+1 grade or -1 grade of Bragg diffraction of first order acousto-optic modulation module
Light is with Bragg diffraction angle θBIncidence first cascades the first acousto-optic modulation module, wherein first the first acousto-optic module of cascade and the
The angle of line is 2 θ between one cascade rising tone optical modulator moduleB；... N cascade 2NA acousto-optic modulation module is put respectively
N-1 is placed in cascade on the 0 grade of Bragg diffraction light and+1 grade or -1 grade of Bragg diffraction light direction of each acousto-optic modulation module, and
N-1 cascades each acousto-optic modulation module and cascades each acousto-optic modulation module with Bragg diffraction angle incidence N；Wherein, N cascade is every
The angle of line is 2 θ between two neighboring acousto-optic modulation moduleB；N is natural number.
In above-mentioned multi-cascade acousto-optic beam splitter, laser beam uses repetition rate for f, and pulse energy is the laser of E
Light beam；Acoustic optic interaction medium uses fused quartz or tellurium oxide, and is coated with anti-reflection film.
The utility model has the following beneficial effects: (1) is defeated using the laser that a set of acousto-optic modulation module realizes four tunnel pulses
Out, on the basis of single pulse energy is constant, the repetition rate for exporting pulse is reduced to original 1/4, realizes frequency reducing.
(2) utilization rate of acousto-optic modulation module laser is greatly improved, signal is realized while switch, has
The output of beam splitting light.
(3) the cascade mode of more acousto-optic modulators is used, f/2 may be implementedN+1(f is the repetition rate of acousto-optic modulator, N
For cascade order) repetition rate quick reduction, meet the requirement of a certain specific Repetition Frequency Laser industrial processes.
(4) the acousto-optic beam splitting light source that this beam splitter is realized is realizing that single pulse energy is constant, repetition rate reduction same
When, light-source structure is more compact, strong antijamming capability, and cost performance is higher.
Detailed description of the invention
Fig. 1 is two channel sound beam splitter laser light source schematic diagram of the utility model one embodiment；
Fig. 2 is two channel sound beam splitter working characteristics schematic diagram of the utility model one embodiment and timing diagram；
Fig. 3 is the acousto-optic beam splitter laser light source schematic diagram of the utility model one embodiment two-stage O_3-BAC；
Fig. 4 is the acousto-optic beam splitter working characteristics schematic diagram and timing diagram of the utility model one embodiment two-stage O_3-BAC；
Fig. 5 is 2N+2 channel sound beam splitter laser light source schematic diagram of the utility model one embodiment；
Fig. 6 is the utility model one embodiment 2N+1A channel sound beam splitter laser light source schematic diagram；
Wherein, 1 is first order acousto-optic modulation module, and 2-1 is first the first acousto-optic modulation module of cascade, and 2-2 is the first order
Join rising tone optical modulator module, 3-1 is second the first acousto-optic modulation module of cascade, and 3-2 is the second cascade rising tone light modulation mould
Block, 3-3 are the second cascade third acousto-optic modulation module, and 3-4 is the second cascade falling tone optical modulator module, and 4-1 is third cascade
First acousto-optic modulation module, 4-2 are that third cascades rising tone optical modulator module.
Specific embodiment
The embodiments of the present invention is described in detail with reference to the accompanying drawing.
Embodiment 1
As shown in Figure 1, present embodiments providing a kind of two compact-sized channel sound beam splitters, parameter packet is embodied
Include: first order acousto-optic modulation module 1, radio-frequency driven power supply, LN crystal make PZT (piezoelectric transducer), using fused quartz/tellurium oxide conduct
Acoustic optic interaction medium, and be coated with and grow tall antireflective anti-reflection film to laser wave.Input repetition rate is f, and pulse energy is swashing for E
Light light beam, and be Bragg diffraction angle θ with the angle on 1 axis of first order acousto-optic modulation moduleB, it is specified that first order acousto-optic modulation
+ 1 grade of Bragg diffraction emergent light of module 1 is the first light beam pulse of the first order, 0 grade of Bradley of first order acousto-optic modulation module 1
Lattice diffraction emergent light is the second light beam pulse of the first order.
Basic functional principle is described as follows: the radiofrequency signal that frequency is 80MHz is added when extraneous, source driving signal works,
LN PZT (piezoelectric transducer) position realize electricity arrive mechanical movement conversion, when mechanical movement act on fused quartz be material acousto-optic it is mutual
Interaction medium forms the ultrasonic field with " body grating " property.Realize Bragg diffraction condition it is as follows: when frequency of sound wave compared with
Height, acoustic optic interaction length L is larger, and between light beam and sound wave corrugated at an angle oblique incidence when, light wave is in the medium
Multiple sound wave faces are passed through, diffraction light at different levels can interfere in medium, and each high level diffraction light will cancel out each other, and only occur 0
The Bradley of grade and+1 grade (or 0 grade and -1 grade, depending on incidence angle, the present embodiment 1 is assumed to only exist 0 grade and+1 grade of diffraction light)
Lattice diffraction.Intimate 100% diffraction efficiency can be realized by increasing radio-frequency power.When the ultrasound that addition supersonic frequency is 80MHz
When field, Bragg diffraction angle is acquired at this timeWherein, λ0For lambda1-wavelength, η is transmitted across for light field
The refractive index of medium in journey, Λ are wavelength Λ=V of sound wave in mediums/fs, VsFor the spread speed of ultrasonic field, fsFor ultrasonic field
Frequency.Work as λ0=1064nm, η=1, Vs=5960m/s, fs=80MHz obtains θB=7.1mrad, when generation acousto-optic Prague
When diffraction interacts, being equivalent to the laser beam in resonant cavity deflecting to angle completely is 2 θB+ 1 grade of diffraction light direction, when
When removing the ultrasonic field of 80MHz, acousto-optic bragg diffraction effect disappears, and incident beam is transmitted along 0 grade of diffraction light direction at this time.Its
The duty ratio of the ultrasonic field switch of middle first order acousto-optic modulation module 1 is 1:1.
As shown in Fig. 2, acting on+1 grade of diffraction light by Bragg diffraction when ultrasonic field is added in first order acousto-optic modulation module 1
Direction is opened, and 0 grade of diffraction light direction is in the state closed, then repetition rate is f in input a cycle, pulse energy is
The laser beam of E will transmit f/2 wavelength along+1 grade of diffraction light direction, i.e. the first light beam pulse of the first order is transmitted through f/2
Wavelength；If bragg diffraction effect disappears, from a week at this point, the ultrasound in first order acousto-optic modulation module 1 is quickly removed
Repetition rate is f in phase, and the laser beam that pulse energy is E continues to exist along straightline propagation along the direction of Bragg angle incidence
In the period that ultrasonic field removes, the second light beam pulse of the first order is transmitted through f/2 wavelength, at this point, each light field being transmitted through
Energy remains unchanged.
The above process controls laser pulse by first order acousto-optic modulation module 1 and realizes in two-way transmission direction point
Beam and frequency reducing, the repetition rate of output laser pulse is the modulating frequency of 1/2 first order acousto-optic modulation module 1 at this time, transmission
Single pulse energy remains unchanged.
Embodiment 2
Using cascade thought, the present embodiment 2 provides a kind of acousto-optic beam splitter of compact-sized two-stage O_3-BAC, such as schemes
Shown in 3.Specific implementation parameter includes: that first order acousto-optic modulation module 1, first cascades the first acousto-optic modulation module 2-1, the first order
Join rising tone optical modulator module 2-2, radio-frequency driven power supply, LN crystal make PZT (piezoelectric transducer), using fused quartz/tellurium oxide as sound
Light interaction medium, and be coated with and grow tall antireflective anti-reflection mould to laser wave.Input repetition rate is f, and pulse energy is the laser of E
Light beam places the first cascade rising tone optical modulator module 2- in 0 grade of Bragg diffraction light direction of first order acousto-optic modulation module 1
2,0 grade of Bragg diffraction light of first order acousto-optic modulation module 1 is with Bragg diffraction angle θBIncidence first cascades rising tone light tune
Molding block 2-2；First the first sound of cascade is placed in+1 grade of first order acousto-optic modulation module 1 or -1 grade of Bragg diffraction light direction
Optical modulator module 2-1 ,+1 grade of first order acousto-optic modulation module 1 or -1 grade of Bragg diffraction light are with Bragg diffraction angle θBIt is incident
First the first acousto-optic modulation module 2-1 of cascade；Wherein, first the first acousto-optic module 2-1 of cascade and the first cascade rising tone light tune
The angle of line is 2 θ between molding block 2-2B.Provide the positive level-one Bragg diffraction emergent light of first order acousto-optic modulation module 1
For the first light beam pulse of the first order, 0 grade of Bragg diffraction emergent light of first order acousto-optic modulation module 1 is the second light beam of the first order
The positive level-one Bragg diffraction emergent light of pulse, first the first acousto-optic modulation module 2-1 of cascade is the first light beam pulse of the second level,
0 grade of Bragg diffraction emergent light of first the first acousto-optic modulation module 2-1 of cascade is the second light beam pulse of the second level, the first cascade
0 grade of Bragg diffraction emergent light of rising tone optical modulator module 2-2 is second level third light beam pulse, the first cascade rising tone light
+ 1 grade of Bragg diffraction emergent light of modulation module 2-2 is the 4th light beam pulse of the second level.
Basic functional principle is made as shown in figure 4, when ultrasonic field is added in first order acousto-optic modulation module 1 by Bragg diffraction
It is opened with+1 grade of diffraction light direction, it is f when inputting repetition rate in a cycle that 0 grade of diffraction light direction, which is in the state closed,
Pulse energy is the laser beam of E, it will transmit f/2 wavelength, i.e. the first light beam pulse of the first order along+1 grade of diffraction light direction
For f/2 wavelength, the first acousto-optic modulation module 2-1 is cascaded for first, when ultrasonic field is added, through the first order the first acousto-optic tune
F/2 wavelength of the diffraction transmission of molding block 1 is deflected through the diffraction of first the first acousto-optic modulation module 2-1 of cascade
Continue to propagate to+1 grade of diffraction light direction, i.e., within the period that ultrasonic field is added, the first light beam pulse of the second level passes through f/4 wave
It is long, if bragg diffraction effect disappears, warp at this point, the ultrasound in first the first acousto-optic modulation module 2-1 of cascade is quickly removed
F/2 wavelength of the diffraction transmission of the first acousto-optic modulation of first order module 1 linearly continues to propagate, i.e., in ultrasonic field
In the period removed, the second light beam pulse of the second level is transmitted through f/4 wavelength；If at this point, in first order acousto-optic modulation module 1
Ultrasound quickly removed, bragg diffraction effect disappear, input a cycle in repetition rate be f, pulse energy be E swash
Light light beam continues along the direction of Bragg angle incidence along straightline propagation, i.e., within the period that ultrasonic field removes, the second light of the first order
Beam pulse is transmitted through f/2 wavelength, for the first cascade rising tone optical modulator module 2-2, when ultrasonic field is added, through the
The f/2 wavelength along linear transmission of level-one acousto-optic modulation module 1 is made through the diffraction of the first cascade rising tone optical modulator module 2-2
Continue to propagate with+1 grade of diffraction light direction is deflected into, i.e., the week being added in the first cascade rising tone optical modulator module 2-2 ultrasonic field
In phase, the 4th light beam pulse of the second level is transmitted through f/4 wavelength, if at this point, in first order rising tone optical modulator module 2-2
Ultrasound is quickly removed, and bragg diffraction effect disappears, through first order acousto-optic modulation module 1 along f/2 wave of the transmission of straight line
Long to continue linearly to continue to propagate, i.e., within the period that ultrasonic field removes, second level third light beam pulse is transmitted through f/4
A wavelength, at this point, each Light Energy being transmitted through remains unchanged.
The above process passes through first order acousto-optic modulation module 1, first the first acousto-optic modulation module 2-1 of cascade, the first cascade
Rising tone optical modulator module 2-2 is periodically switched, and controlling laser pulse realizes beam splitting and drop in four tunnel transmission directions
Frequently, at this time the repetition rate of output laser pulse be 1/4 the first acousto-optic modulation of first order module 1 modulating frequency, the list of transmission
Pulse energy remains unchanged.
When it is implemented, the radiofrequency signal that frequency is 80MHz is added when extraneous, source driving signal work is changed in LN piezoelectricity
Can device position realize electricity arrive mechanical movement conversion, when mechanical movement act on fused quartz be material acoustic optic interaction medium,
Form the ultrasonic field with " body grating " property.Realize that the condition of Bragg diffraction is as follows: when frequency of sound wave is higher, acousto-optic interaction
It is larger with length L, and between light beam and sound wave corrugated at an angle oblique incidence when, light wave will pass through multiple sound in the medium
Corrugated, diffraction light at different levels can interfere in medium, and each high level diffraction light will cancel out each other, and only occur 0 grade and+1 grade (or 0
Grade and -1 grade) (depending on incidence angle depending on, the present embodiment 2 hypothesis only exist 0 grade and+1 grade of diffraction light) Bragg diffraction.Pass through increasing
Add radio-frequency power that can realize intimate 100% diffraction efficiency.When the ultrasonic field that supersonic frequency is 80MHz is added, acquire at this time
Bragg diffraction angleλ0=1064nm, η=1, Vs=5960m/s, fs=80MHz obtains θB=
7.1mrad is equivalent to the laser beam in resonant cavity deflecting to angle completely when the interaction of acousto-optic Bragg diffraction occurs
For 2 θB+ 1 grade of diffraction light direction, when removing the ultrasonic field of 80MHz, the consumption of acousto-optic bragg diffraction effect, incident light at this time
Beam is transmitted along 0 grade of diffraction light direction.Wherein, the switch periods of first order acousto-optic modulation module 1 are T1, (such as T1=200 μ
S), the switch periods and first of first the first acousto-optic modulation module 2-1 of cascade and the first cascade rising tone optical modulator module 2-2
Grade acousto-optic modulation module 1 is identical, but duty ratio is different.The duty ratio of first order acousto-optic modulation module 1 is 1:1, and the first order
The duty ratio for joining the cascade of the first acousto-optic modulation module 2-1 and first rising tone optical modulator module 2-2 is 1:3.And first order acousto-optic
When modulation module 1 loads ultrasound, the load of the first acousto-optic modulation module 2-1 ultrasound of synchronous the first cascade of triggering, first order acousto-optic
When modulation module 1 removes ultrasound, the load of synchronous the first cascade of triggering rising tone optical modulator module 2-2 ultrasound.
As shown in figure 4, acting on+1 grade of diffraction light by Bragg diffraction when ultrasonic field is added in first order acousto-optic modulation module 1
Direction is opened, and 0 grade of diffraction light direction is in the state closed, when repetition rate is f, pulse energy E in input a cycle
Laser beam, it transmits f/2 wavelength along+1 grade of diffraction light direction, i.e. it is a to be transmitted through f/2 for the first light beam pulse of the first order
Wavelength, for first the first acousto-optic modulation module 2-1 of cascade, when ultrasonic field is added, through first order acousto-optic modulation module 1
F/2 wavelength of diffraction transmission deflects into+1 grade of diffraction through the diffraction of first the first acousto-optic modulation module 2-1 of cascade
Light direction continues to propagate, i.e., within the period that ultrasonic field is added, the first light beam pulse of the second level is transmitted through f/4 wavelength, if
At this point, the ultrasound in first the first acousto-optic modulation module 2-1 of cascade is quickly removed, bragg diffraction effect disappears, through first
F/2 wavelength of the diffraction transmission of grade acousto-optic modulation module 1 linearly continues to propagate, i.e., the week removed in ultrasonic field
In phase, the second light beam pulse of the second level is transmitted through f/4 wavelength；If at this point, the ultrasonic quilt in first order acousto-optic modulation module 1
It quickly removes, bragg diffraction effect disappears, and inputting repetition rate in a cycle is f, and pulse energy is the laser beam edge of E
The direction of Bragg angle incidence is continued along straightline propagation, i.e., within the period that ultrasonic field removes, the second light beam pulse of the first order is passed
It is defeated by f/2 wavelength, for the first cascade rising tone optical modulator module 2-2, when ultrasonic field is added, through first order acousto-optic tune
The f/2 wavelength along linear transmission of molding block 1 deflects into+1 through the diffraction of the first cascade rising tone optical modulator module 2-2
Grade diffraction light direction continues to propagate, i.e., within the period that the first cascade rising tone optical modulator module 2-2 ultrasonic field is added, the second level
4th light beam pulse is transmitted through f/4 wavelength, if at this point, the ultrasound in the first cascade rising tone optical modulator module 2-2 is fast
Speed is removed, and bragg diffraction effect disappears, and the f/2 wavelength through first order acousto-optic modulation module 1 along the transmission of straight line continues edge
Rectilinear direction continues to propagate, i.e., within the period that ultrasonic field removes, second level third light beam pulse is transmitted through f/4 wavelength,
At this point, each Light Energy being transmitted through remains unchanged.
The above process passes through first order acousto-optic modulation module 1, first the first acousto-optic modulation module 2-1 of cascade, the first cascade
Rising tone optical modulator module 2-2 is periodically switched, and controlling laser pulse realizes beam splitting and drop in four tunnel transmission directions
Frequently, at this time the repetition rate of output laser pulse be 1/4 first order acousto-optic modulation module 1 modulating frequency, the pulse of transmission
Energy remains unchanged.
Embodiment 3
If under conditions of keeping single pulse energy constant, gradually reducing the repetition rate of output laser, can also be used
Cascade thought noted earlier constructs the laser beam splitter mode in 2N+2 channel, wherein N indicates cascade order, and N is nature
Number.First the first acousto-optic modulation module 2-1 of cascade and the first cascade rising tone optical modulator module 2-2 construct swashing for 4 channels
Light beam splitting, second the first acousto-optic modulation module 3-1 of cascade, the second cascade rising tone optical modulator module 3-2 construct swashing for 6 channels
Light beam splitting, this cascade can be achieved to gradually reduce the repetition rate of output laser, in each laser channeling of output, realize according to
It is secondary to beThe different size of frequency reducing of modulating frequency exports.
As shown in figure 5, a kind of multiple channel acousto beam splitter, including first order acousto-optic modulation module, first the first sound of cascade
Optical modulator module, the first cascade rising tone optical modulator module ... ... N cascades the first acousto-optic modulation module, N cascades the rising tone
Optical modulator module further includes that radio-frequency driven power supply, LN crystal make PZT (piezoelectric transducer), mutual as acousto-optic using fused quartz/tellurium oxide
Interaction medium, and be coated with and grow tall antireflective anti-reflection film to laser wave.Input repetition rate is f, and pulse energy is the laser light of E
Angle on beam, with 1 axis of first order acousto-optic modulation module is Bragg diffraction angle θB, the first cascade rising tone light modulation mould
Block 2-2 is located on input laser beam and the extended line of the first acousto-optic modulation module 1, first the first acousto-optic modulation module 2- of cascade
1 is located at+1 grade of diffraction light direction of the first acousto-optic modulation module 1, wherein first the first acousto-optic module 2-1 of cascade and the first cascade
The angle of line is 2 θ between rising tone optical modulator module 2-2B, it is specified that+1 grade of Bragg diffraction of the first acousto-optic modulation module 1
Emergent light is the first light beam pulse of the first order, and 0 grade of Bragg diffraction emergent light of the first acousto-optic modulation module 1 is the first order second
+ 1 grade of Bragg diffraction emergent light of light beam pulse, first the first acousto-optic modulation module 2-1 of cascade is the first light beam of second level arteries and veins
Punching, first cascade the first acousto-optic modulation module 2-1 0 grade of Bragg diffraction emergent light be the second light beam pulse of the second level, first
0 grade of Bragg diffraction emergent light for cascading rising tone optical modulator module 2-2 is second level third light beam pulse, the first cascade second
+ 1 grade of Bragg diffraction emergent light of acousto-optic modulation module 2-2 is the 4th light beam pulse of the second level.Wherein, the first light beam of the second level
Pulse and the 4th light beam pulse of the second level directly export availableFrequency reducing pulse.Second the first acousto-optic modulation module of cascade
3-1 is located on the extended line of 0 grade of Bragg diffraction light outgoing of first the first acousto-optic modulation module 2-1 of cascade, the second cascade the
Two acousto-optic modulation module 3-2 are located at the extended line of 0 grade of Bragg diffraction light outgoing of the first cascade rising tone optical modulator module 2-2
On.Ibid+1 grade of Bragg diffraction emergent light of the first acousto-optic modulation module 3-1 of the second cascade of regulation is the first light beam of the third level
0 grade of Bragg diffraction emergent light of pulse, second the first acousto-optic modulation module 3-1 of cascade is the second light beam pulse of the third level, the
0 grade of Bragg diffraction emergent light of two cascade rising tone optical modulator module 3-2 is third level third light beam pulse, the second cascade the
+ 1 grade of Bragg diffraction emergent light of two acousto-optic modulation module 3-2 is the 4th light beam pulse of the third level, wherein the first of the third level
Light beam pulse and the 4th light beam pulse of the third level directly export availableFrequency reducing pulse ... ....N cascades the first acousto-optic
Modulation module is located at N-1 and cascades on the extended line of 0 grade of Bragg diffraction light outgoing of the first acousto-optic modulation module, N cascade
Rising tone optical modulator module is located on the extended line of 0 grade of Bragg diffraction light outgoing of N-1 cascade rising tone optical modulator module.
+ 1 grade of Bragg diffraction emergent light that N cascades the first acousto-optic modulation module is the first light beam pulse of N+1 grade, and N cascades the
0 grade of Bragg diffraction emergent light of one acousto-optic modulation module is the second light beam pulse of N+1 grade, and N cascades the second acousto-optic modulation
0 grade of Bragg diffraction emergent light of module is N+1 grades of third light beam pulses, and N cascades+1 grade of Bradley of rising tone optical modulator module
Lattice diffraction emergent light is the 4th light beam pulse of N+1 grade, wherein N+1 grades of the 4th light of the first light beam pulse and N+1 grade
Beam pulse directly exports availableFrequency reducing pulse.
Pass through first order acousto-optic modulation module 1, first the first acousto-optic modulation module 2-1 of cascade, the first cascade rising tone light
Modulation module 2-2, second the first acousto-optic modulation module 3-1 of cascade, the second the cascade rising tone optical modulator module 3-2 ... ..., N
The periodic switch for cascading the first and second acousto-optic modulation module, control laser pulse realizes point in the transmission direction of the road 2N+2
Beam and frequency reducing, the repetition rate of output laser pulse can be realized and be gradually reduced at this time, successively be realizedThe different size of frequency reducing of modulating frequency exports, the pulse of transmission
Energy remains unchanged.
Embodiment 4
If under conditions of keeping single pulse energy constant, the further repetition rate for reducing output laser can also
Using cascade thought noted earlier, building 2N+1The laser beam splitter mode in a channel, wherein N indicates that cascade order, N are
Natural number.As shown in fig. 6, first the first acousto-optic modulation module 2-1 of cascade and the first cascade rising tone optical modulator module 2-2 structure
The laser beam splitter in 4 channels, second the first acousto-optic modulation module 3-1 of cascade, the second cascade rising tone optical modulator module 3- are built
2, the second cascade third acousto-optic modulation module 3-3, the second cascade falling tone optical modulator module 3-4 construct the laser point in 8 channels
Beam, therefore when N grades of cascades, the repetition rate f of output beam is reduced to originalIt includes: first that parameter, which is embodied,
Grade acousto-optic modulation module 1, first cascades the first acousto-optic modulation module 2-1, the first cascade rising tone optical modulator module 2-
2 ... ..., N cascade the first acousto-optic modulation module, N cascade rising tone optical modulator module ... ... N cascade the 2ndNAcousto-optic tune
Molding block, further include radio-frequency driven power supply, LN crystal make PZT (piezoelectric transducer), using fused quartz/tellurium oxide as acoustic optic interaction
Medium, and be coated with and grow tall antireflective anti-reflection film to laser wave.Input repetition rate is f, and pulse energy is the laser beam of E, with
Angle on 1 axis of first order acousto-optic modulation module is Bragg diffraction angle θB, the first cascade rising tone optical modulator module 2-2
In on input laser beam and the extended line of first order acousto-optic modulation module 1, first the first acousto-optic modulation module 2-1 of cascade is located at
+ 1 grade of diffraction light direction of the first acousto-optic modulation module 1, wherein first the first acousto-optic module 2-1 of cascade and the first cascade rising tone
The angle of line is 2 θ between optical modulator module 2-2B.Provide+1 grade of Bragg diffraction emergent light of the first acousto-optic modulation module 1
For the first light beam pulse of the first order, 0 grade of Bragg diffraction emergent light of first order acousto-optic modulation module 1 is the second light beam of the first order
+ 1 grade of Bragg diffraction emergent light of pulse, first the first acousto-optic modulation module 2-1 of cascade is the first light beam pulse of the second level, the
0 grade of Bragg diffraction emergent light of one the first acousto-optic modulation module 2-1 of cascade is the second light beam pulse of the second level, the first cascade
0 grade of Bragg diffraction emergent light of rising tone optical modulator module 2-2 is second level third light beam pulse, the first cascade rising tone
+ 1 grade of Bragg diffraction emergent light of optical modulator module 2-2 is the 4th light beam pulse ... ... of the second level, N cascade the (the 2ndN-1)
0 grade of Bragg diffraction emergent light of a acousto-optic modulation module is N+1 grade the (the 2ndN- 3) light beam pulse, N cascade the (the 2ndN-1)
+ 1 grade of Bragg diffraction emergent light of a acousto-optic modulation module is N+1 grade the (the 2ndN- 2) light beam pulse, N cascade the 2ndNA sound
0 grade of Bragg diffraction emergent light of optical modulator module is N+1 grade the (the 2ndN- 1) a light beam pulse, N the cascade 2ndNA acousto-optic
+ 1 grade of Bragg diffraction emergent light of modulation module is N+1 grade the 2ndNA light beam pulse.
Pass through first order acousto-optic modulation module 1, first the first acousto-optic modulation module 2-1 of cascade, the first cascade rising tone light
Modulation module 2-2, second the first acousto-optic modulation module 3-1 of cascade, the second cascade rising tone optical modulator module 3-2, the second cascade
Third acousto-optic modulation module 3-3, the second cascade falling tone optical modulator module 3-4 ... ..., N cascade the first acousto-optic modulation mould
Block, N cascade rising tone optical modulator module ... ... N cascade the 2ndNAcousto-optic modulation module.N cascade 2NA acousto-optic modulation mould
The periodic switch of block controls laser pulse 2N+1Beam splitting and frequency reducing are realized on tunnel direction, export laser at this time
The repetition rate of pulse is reduced to 1 modulating frequency of first order acousto-optic modulation moduleThe single pulse energy of transmission is kept not
Become, this acousto-optic beam splitter realizes multichannel significantly frequency reducing relative to embodiment 3.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying specific embodiment of the present utility model above, those of ordinary skill in the art
It should be appreciated that these are merely examples, various deformation or modification can be made to these embodiments, it is practical without departing from this
Novel principle and essence.The scope of the utility model is only limited by the claims that follow.
Claims (6)
1. a kind of acousto-optic beam splitter of two-stage O_3-BAC, including laser beam；It is characterized in that including first order acousto-optic modulation module,
First the first acousto-optic modulation module of cascade, the first cascade rising tone optical modulator module and radio-frequency driven power supply, LN piezoelectric energy-conversion
Device and acoustic optic interaction medium；Laser beam is with Bragg diffraction angle θBIncident first order acousto-optic modulation module, first order acousto-optic
Modulation module projects 0 grade of Bragg diffraction light and+1 grade or -1 grade of Bragg diffraction light；At 0 grade of first order acousto-optic modulation module
Bragg diffraction light direction places the first cascade rising tone optical modulator module, and 0 grade of Prague of first order acousto-optic modulation module is spread out
Light is penetrated with Bragg diffraction angle θBIncidence first cascades rising tone optical modulator module；At+1 grade of first order acousto-optic modulation module
Or -1 grade of Bragg diffraction light direction placement first acousto-optic modulation module of the first cascade ,+1 grade of first order acousto-optic modulation module
Or -1 grade of Bragg diffraction light is with Bragg diffraction angle θBIncidence first cascades the first acousto-optic modulation module；Wherein, the first cascade
The angle of line is 2 θ between first acousto-optic module and the first cascade rising tone optical modulator moduleB。
2. the acousto-optic beam splitter of two-stage O_3-BAC as described in claim 1, characterized in that laser beam uses repetition rate for f,
Pulse energy is the laser beam of E；Acoustic optic interaction medium uses fused quartz or tellurium oxide, and is coated with anti-reflection film.
3. a kind of multiple channel acousto beam splitter, including laser beam；It is characterized in that including first order acousto-optic modulation module, first
Cascade the first acousto-optic modulation module, the first cascade rising tone optical modulator module ... ... N cascade the first acousto-optic modulation module, N
Cascade rising tone optical modulator module, radio-frequency driven power supply, LN PZT (piezoelectric transducer), acoustic optic interaction medium；Laser beam is with Bradley
Lattice diffraction angleBIncident first order acousto-optic modulation module is put in 0 grade of Bragg diffraction light direction of first order acousto-optic modulation module
The first cascade rising tone optical modulator module is set, 0 grade of Bragg diffraction light of first order acousto-optic modulation module is with Bragg diffraction angle
θBIncidence first cascades rising tone optical modulator module；In+1 grade or -1 grade of Bragg diffraction light side of first order acousto-optic modulation module
The first acousto-optic modulation module is cascaded to placement first ,+1 grade of first order acousto-optic modulation module or -1 grade of Bragg diffraction light are with cloth
Glug diffraction angleBIncidence first cascades the first acousto-optic modulation module；Wherein, first the first acousto-optic module of cascade and the first cascade
The angle of line is 2 θ between rising tone optical modulator moduleB；... the cascade first acousto-optic modulation module of N and the second acousto-optic tune
Molding block be respectively placed in the first acousto-optic modulation module 0 grade of Bragg diffraction light and+1 grade or -1 of the first acousto-optic modulation module
On the extended line of grade Bragg diffraction light direction, N-1 cascades 0 grade of Bragg diffraction light of the first acousto-optic modulation module with Bradley
Lattice diffraction angleBIncident N grades of the first acousto-optic modulation modules of cascade, N-1 cascade 0 grade of Prague of rising tone optical modulator module
Diffraction light is with Bragg diffraction angle θBIncidence N cascades rising tone optical modulator module, and N cascades the first acousto-optic module and N
The angle for cascading line between rising tone optical modulator module is 2 θB；Wherein, N is natural number.
4. multiple channel acousto beam splitter as claimed in claim 3, characterized in that laser beam uses repetition rate for f, pulse
Energy is the laser beam of E；Acoustic optic interaction medium uses fused quartz or tellurium oxide, and is coated with anti-reflection film.
5. a kind of multi-cascade acousto-optic beam splitter, including laser beam；It is characterized in that including first order acousto-optic modulation module, first
Cascade the first acousto-optic modulation module, the first cascade rising tone optical modulator module ... ... N cascade the first acousto-optic modulation module, N
Cascade rising tone optical modulator module ... ... N cascade the 2ndNAcousto-optic modulation module, radio-frequency driven power supply, LN PZT (piezoelectric transducer), sound
Light interaction medium；Laser beam is with Bragg diffraction angle θBIncident first order acousto-optic modulation module, first order acousto-optic modulation mould
Block projects 0 grade of Bragg diffraction light and+1 grade or -1 grade of Bragg diffraction light；In 0 grade of Prague of first order acousto-optic modulation module
Diffraction light direction places the first cascade rising tone optical modulator module, 0 grade of Bragg diffraction light of first order acousto-optic modulation module with
Bragg diffraction angle θBIncidence first cascades rising tone optical modulator module；In+1 grade or -1 grade of cloth of first order acousto-optic modulation module
Glug diffraction light direction places first the first acousto-optic modulation module of cascade ,+1 grade or -1 grade of Bradley of first order acousto-optic modulation module
Lattice diffraction light is with Bragg diffraction angle θBIncidence first cascades the first acousto-optic modulation module, wherein first the first acousto-optic mould of cascade
The angle of line is 2 θ between block and the first cascade rising tone optical modulator moduleB；... N cascade 2NA acousto-optic modulation module
Be respectively placed in N-1 cascade each acousto-optic modulation module 0 grade of Bragg diffraction light and+1 grade or -1 grade of Bragg diffraction light side
Upwards, and N-1 cascades each acousto-optic modulation module and cascades each acousto-optic modulation module with Bragg diffraction angle incidence N；Wherein,
The angle that N cascades line between each adjacent two acousto-optic modulation module is 2 θB；N is natural number.
6. multi-cascade acousto-optic beam splitter as claimed in claim 5, characterized in that laser beam uses repetition rate for f, pulse
Energy is the laser beam of E；Acoustic optic interaction medium uses fused quartz or tellurium oxide, and is coated with anti-reflection film.
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