CN203573041U - Multichannel acousto-optic modulation mechanism - Google Patents
Multichannel acousto-optic modulation mechanism Download PDFInfo
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- CN203573041U CN203573041U CN201320748432.1U CN201320748432U CN203573041U CN 203573041 U CN203573041 U CN 203573041U CN 201320748432 U CN201320748432 U CN 201320748432U CN 203573041 U CN203573041 U CN 203573041U
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- acousto
- multichannel
- light source
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- optic medium
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Abstract
The utility model relates to a multichannel acousto-optic modulation mechanism, which comprises a laser light source, a collimator, a field lens, an acousto-optic medium and a light barrier sequentially arranged on a primary optic axis. A secondary optic axis is formed and the secondary optic axis and the principal optic axis form an included angle of 35-45 degrees, and is sequentially provided with a shutter, an imaging lens and an imaging medium; the laser light source comprises a light source body and a fixing device; the light source body is arranged in the fixing device; the periphery of the fixing device is provided with a cooling device; the outer wall of the fixing device is provided with a plurality of grooves; the acousto-optic medium comprises a plurality of channels; the upper end of the acousto-optic medium is provided with transducers, and the lower end of the acousto-optic medium is provided with sound absorbing blocks; the transducers are provided with interdigital electrodes; the periphery of the acousto-optic medium is provided with cooling channels. According to the multichannel acousto-optic modulation mechanism, the laser light source can provide high-stability power of the laser light source, the acousto-optic medium can be fully cooled in the working process, and the modulation mechanism implements multichannel, high-power and reliable and stable work.
Description
Technical field
The utility model relates to a kind of acoustooptic modulation mechanism, especially relates to a kind of multichannel acoustooptic modulation mechanism.
Background technology
Early 1920s, the phenomenon of " light wave is by ultrasonic field diffraction " has become one of main study subject of acoustooptics.Because this class effect causes that the variation of light wave in frequency and direction is all very little, its range of application is restricted.Until after the sixties in last century, laser came out, the acoustooptic effect of take is widely used and studies as basic acoustooptic modulation technology.Acoustooptic modulation is to utilize acoustooptic effect that information is loaded on to a kind of physical process on optical frequency carrier wave, and modulation signal is to act on electroacoustics transducer and be converted into the ultrasonic field changing with electrical signal form with electric signal (amplitude modulation) form.Utilize acoustooptic diffraction effect successively to develop multiple acousto-optical device, as acousto-optic modulator, acoustooptic deflector, acousto-optic filter etc.Utilize these devices, can complete fast transmission and conversion between electricity, sound, optical information, can change as requested the direction of propagation of laser beam, realize the select frequency automatically of light beam, light splitting and scanning etc.If acoustooptic modulation mechanism receives the input point signal of a plurality of channels simultaneously, by multi beam ultrasonic wave diffraction, just can obtain modulated multichannel output light, this class device is called multichannel acoustooptic modulation mechanism.The acousto-optic intensity modulated of laser beam has higher response speed than power supply modulation or machinery modulation, more widely applicable than electrooptical modulation.Acoustooptic modulation has efficiency height and complete automatically controlled feature, can carry out in chamber or outer cavity modulation to laser resonator, is widely used in laser display, facsimile record and character image information handling system.
Conventional in existing multi-channel laser scanning technique have a parallel modulation of optical fiber synthetic technology, acousto-optic division modulation (AOFM) technology and acousto-optic (AOPM).Optical fiber synthetic technology is side-by-side with multi-channel optical fibre and uses image-forming objective lens imaging, the coupling efficiency of every optical fiber and laser diode is all different, need independent regulation to avoid the inconsistent of each luminous point, and in order to reduce the angle of divergence, the power that laser requires need lower.At multi-channel optical fibre very, side by side time, whole system is huge and complicated, is difficult to realize 64 tunnels and scans above.Acousto-optic division modulation (AOFM) technology is utilized the principle of the different different deflection angle diffraction lights of ultrasonic generation, by acousto-optic modulator, becomes a few bundle diffraction lights to realize the object of multi-channel scanning a branch of the incident beam modulated.The way of output light is subject to the frequency span restriction of ultrasonic transducer can not be too many, generally only can reach 32 tunnels.Acousto-optic time-division modulation (AOPM) also can realize multi-channel scanning, first Laser Focusing is become to a branch of parallel flat light, acousto-optic crsytal one side of passing through has the parallel ultrasonic transducer of row, and the ultrasound wave that each transducer sends forms grating in crystal, realizes many parallel light path outputs.Owing to existing the electricity harmony of crosstalking to crosstalk between adjacent electrode, so more than the way of so parallel modulation can not be difficult to reach 32 tunnels too much; On the other hand, along with the increase of the number of channel, be added in driving power on multichannel acousto-optic medium by increasing, thermal value will increase, the high-frequency signal of interchannel is crosstalked can be more and more serious, can not realize reliable, stable work, must take adequate measures to solve; Moreover, if LASER Light Source under high-power effect, its radiating effect is often undesirable, light source power poor stability.
Utility model content
In order to overcome the deficiencies in the prior art, the utility model provides a kind of reliable, stable high-power multichannel acoustooptic modulation mechanism.
A kind of multichannel acoustooptic modulation mechanism, comprise the LASER Light Source, collimating apparatus, field lens, acousto-optic medium and the light barrier that on primary optical axis, are provided with in turn, 35～45 degree angles at primary optical axis form secondary optical axis, are provided with in turn shutter, imaging len and image forming medium on secondary optical axis; Described LASER Light Source comprises light source body and stationary installation, and described light source body is arranged in stationary installation, and the peripheral surrounding of described stationary installation is provided with heat abstractor, and the outer wall of stationary installation is provided with some grooves; Described acousto-optic medium comprises several channels, and acousto-optic medium upper end is provided with transducer, and lower end is provided with sound absorption block, and described transducer is provided with interdigital electrode, and the peripheral surrounding of described acousto-optic medium is provided with cooling duct.
Preferably, described interdigital electrode is sputtered on transducer.
Preferably, the interdigital electrode of described each channel and the interdigital electrode of adjacent channel are isolated mutually.Can effectively reduce interchannel radiofrequency signal crosstalks.
Preferably, described heat abstractor is heat radiator.The heat that light source body is produced can be distributed fast, improves the stability of LASER Light Source power.
Preferably, in described cooling duct, be connected with chilled water.By chilled water, reduce the particularly temperature of transducer of acousto-optic medium, avoid because the high-power acousto-optic medium thermal value that makes increases, the high-frequency signal that causes interchannel crosstalk can serious phenomenon generation.
Preferably, in described cooling duct, be provided with heating radiator.By heating radiator, reduce the particularly temperature of transducer of acousto-optic medium, avoid because the high-power acousto-optic medium thermal value that makes increases, the high-frequency signal that causes interchannel crosstalk can serious phenomenon generation.
Preferably, the center of described shutter is territory, transparent zone, and territory, described transparent zone is rectangle.When shutter release signal triggers, shutter is opened, otherwise closes.
The utility model is simple in structure, reasonable in design, LASER Light Source power stability is good, by the cooling duct being provided with, can make acousto-optic medium fully cooling in the course of the work, avoid the excessive impact of thermal value, make this modulation winding machine multichannel, high-power, reliable, stable work; The utility model can provide high density multichannel, light beam high conformity, and light path parallel is easy to further collimation focusing, makes in the fine CTP of being applied to of this modulation mechanism, laser photo-typesetting and laser drawing system.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is the structural representation of the utility model LASER Light Source;
Fig. 3 is the structural representation of the utility model acousto-optic medium.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but protection domain of the present utility model is not limited to this.
With reference to Fig. 1～3, a kind of multichannel acoustooptic modulation mechanism, comprise the LASER Light Source, collimating apparatus, field lens, acousto-optic medium and the light barrier that on primary optical axis, are provided with in turn, in 35～45 degree angles of primary optical axis, form secondary optical axis, on secondary optical axis, be provided with in turn shutter, imaging len and image forming medium; The center of described shutter is territory, transparent zone, and territory, described transparent zone is rectangle.When shutter release signal triggers, shutter is opened, otherwise closes.
LASER Light Source comprises light source body 1 and stationary installation 2, described light source body 1 is arranged in stationary installation 2, the peripheral surrounding of described stationary installation 2 is provided with heat abstractor 3, described heat abstractor is heat radiator, the outer wall of stationary installation 2 is provided with some grooves 4, and described groove is evenly distributed on the outer wall of stationary installation.
Described acousto-optic medium comprises several channels, and acousto-optic medium upper end is provided with transducer 5, and lower end is provided with sound absorption block 6, and described transducer 5 is provided with interdigital electrode 7, and described interdigital electrode 3 is sputtered on transducer 1, and the peripheral surrounding of described acousto-optic medium is provided with cooling duct 8.
The interdigital electrode of described each channel and the interdigital electrode of adjacent channel are isolated mutually.Can effectively reduce interchannel radiofrequency signal crosstalks.
In described cooling duct, be connected with chilled water.By chilled water, reduce the particularly temperature of transducer of acousto-optic medium, avoid because the high-power acousto-optic medium thermal value that makes increases, the high-frequency signal that causes interchannel crosstalk can serious phenomenon generation.
The laser of the power stability that LASER Light Source is sent, by forming after collimating apparatus after directional light, it is the flat light of focusing of 0.03NA that line focus lens shaped becomes aperture, by the center of dropping on acousto-optic medium with a tight waist after field lens, can reduce the transit time like this.There are 35～45 degree angles in xy plane and acousto-optic medium in incident light optical axis, makes it under Bragg diffraction pattern, uses 1 order diffraction light as media imaging light beam.Acousto-optic medium one end is provided with the transducer with interdigital electrode, the other end is provided with sound absorption block, the output beam that modulated ultrasonic serial ripple bag can be modulated into flat parallel light more than 256 tunnels is exported along secondary optical axis, and not modulated light beam is stopped by the light barrier on primary optical axis.
Concrete modulated process be the carrier wave electric signal of excitation ultrasound be first carried multichannel light beam whether the serial square-wave signal of diffracted information modulate, then by the transducer with interdigital electrode, become ultrasonic signal and enter in acousto-optic medium.While propagating in acousto-optic medium due to ultrasound wave, need certain hour, the square wave switching signal duration is very short, therefore the sound wave in acousto-optic medium can be formed to the serial ripple packet sequence cutting in and out along the direction of propagation.When a modulated frame ultrasonic signal enters acousto-optic medium completely, there is a shutter opening pulse to arrive shutter simultaneously, at this moment diffracted multichannel light beam arrives image forming medium, completes imaging process.
With reference to Fig. 1～3, a kind of multichannel acoustooptic modulation mechanism, comprise the LASER Light Source, collimating apparatus, field lens, acousto-optic medium and the light barrier that on primary optical axis, are provided with in turn, in 35～45 degree angles of primary optical axis, form secondary optical axis, on secondary optical axis, be provided with in turn shutter, imaging len and image forming medium; The center of described shutter is territory, transparent zone, and territory, described transparent zone is rectangle.When shutter release signal triggers, shutter is opened, otherwise closes.
LASER Light Source comprises light source body 1 and stationary installation 2, described light source body 1 is arranged in stationary installation 2, the peripheral surrounding of described stationary installation 2 is provided with heat abstractor 3, described heat abstractor is heat radiator, the outer wall of stationary installation 2 is provided with some grooves 4, and described groove is evenly distributed on the outer wall of stationary installation.
Described acousto-optic medium comprises several channels, and acousto-optic medium upper end is provided with transducer 5, and lower end is provided with sound absorption block 6, and described transducer 5 is provided with interdigital electrode 7, and described interdigital electrode 3 is sputtered on transducer 1, and the peripheral surrounding of described acousto-optic medium is provided with cooling duct 8.
The interdigital electrode of described each channel and the interdigital electrode of adjacent channel are isolated mutually.Can effectively reduce interchannel radiofrequency signal crosstalks.
In described cooling duct, be provided with heating radiator.By heating radiator, reduce the particularly temperature of transducer of acousto-optic medium, avoid because the high-power acousto-optic medium thermal value that makes increases, the high-frequency signal that causes interchannel crosstalk can serious phenomenon generation.
The utility model can provide high density multichannel, LASER Light Source can provide the LASER Light Source power of good stability, can also make acousto-optic medium fully cooling in the course of the work simultaneously, avoid the excessive impact of thermal value, make this modulation winding machine multichannel, high-power, reliable, stable work.
Claims (8)
1. a multichannel acoustooptic modulation mechanism, comprise the LASER Light Source, collimating apparatus, field lens, acousto-optic medium and the light barrier that on primary optical axis, are provided with in turn, it is characterized in that: 35～45 degree angles at primary optical axis form secondary optical axis, are provided with in turn shutter, imaging len and image forming medium on secondary optical axis; Described LASER Light Source comprises light source body and stationary installation, and described light source body is arranged in stationary installation, and the peripheral surrounding of described stationary installation is provided with heat abstractor, and the outer wall of stationary installation is provided with some grooves; Described acousto-optic medium comprises several channels, and acousto-optic medium upper end is provided with transducer, and lower end is provided with sound absorption block, and described transducer is provided with interdigital electrode, and the peripheral surrounding of described acousto-optic medium is provided with cooling duct.
2. multichannel acoustooptic modulation according to claim 1 mechanism, is characterized in that: described interdigital electrode is sputtered on transducer.
3. multichannel acoustooptic modulation according to claim 1 mechanism, is characterized in that: the interdigital electrode of described each channel and the interdigital electrode of adjacent channel are isolated mutually.
4. multichannel acoustooptic modulation according to claim 1 mechanism, is characterized in that: described heat abstractor is heat radiator.
5. multichannel acoustooptic modulation according to claim 1 mechanism, is characterized in that: described groove is evenly distributed on the outer wall of stationary installation.
6. multichannel acoustooptic modulation according to claim 1 mechanism, is characterized in that: in described cooling duct, be connected with chilled water.
7. multichannel acoustooptic modulation according to claim 1 mechanism, is characterized in that: in described cooling duct, be provided with heating radiator.
8. multichannel acoustooptic modulation according to claim 1 mechanism, is characterized in that: the center of described shutter is territory, transparent zone, and territory, described transparent zone is rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320748432.1U CN203573041U (en) | 2013-11-25 | 2013-11-25 | Multichannel acousto-optic modulation mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320748432.1U CN203573041U (en) | 2013-11-25 | 2013-11-25 | Multichannel acousto-optic modulation mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN203573041U true CN203573041U (en) | 2014-04-30 |
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| CN201320748432.1U Expired - Fee Related CN203573041U (en) | 2013-11-25 | 2013-11-25 | Multichannel acousto-optic modulation mechanism |
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2013
- 2013-11-25 CN CN201320748432.1U patent/CN203573041U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20201125 |