CN201118091Y - Same medium two-dimensional acousto-optic Q switch - Google Patents
Same medium two-dimensional acousto-optic Q switch Download PDFInfo
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- CN201118091Y CN201118091Y CNU2007200868236U CN200720086823U CN201118091Y CN 201118091 Y CN201118091 Y CN 201118091Y CN U2007200868236 U CNU2007200868236 U CN U2007200868236U CN 200720086823 U CN200720086823 U CN 200720086823U CN 201118091 Y CN201118091 Y CN 201118091Y
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- wave transducer
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- acoustooptic
- acousto
- driving power
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The utility model relates to a laser Q switch and discloses a co-medium two-dimensional acoustooptic Q switch, comprising acoustooptic medium, an acoustical damper, a computer, a longitudinal wave transducer, a rotational wave transducer, an LC matching network, a high-frequency socket, a driving power and a temperature controlled switch, which is characterized in that: the computer is connected with the driving power through the synchronous signals; the driving power is connected with the high-frequency socket; the high-frequency socket is connected with the LC matching network; the LC matching network is connected with the longitudinal wave transducer and the rotational wave transducer; the longitudinal wave transducer and the rotational wave transducer are connected with the acoustooptic medium; the temperature controlled switch is connected with the driving power. The laser Q switch has the advantages of high modulation loss, less inserted components and low cost, and is very suitable for a high-power and high-gain Q laser.
Description
Technical field
The utility model relates to a kind of laser Q-switching switch, is specifically related to a kind of with medium two dimension acoustooptic Q-switching.
Background technology
Transfer in the Q equipment at continuous laser, the application of acoustooptic Q-switching is summarised as three broad aspect:
1, is used for multimode, unpolarized solid state laser;
2, be used for small-sized, polarization/unpolarized diode pumping solid laser;
3, be used for single mode, polarization, the low solid state laser of dispersing;
To multimode, unpolarized solid state laser, special generally all the employing with the fused quartz as the Nd:YAG laser is the acoustooptic Q-switching of medium, the injection mode of requirement sound is a shear line wave device, main cause be acoustic optic interaction to the random polarization of incident light insensitive due to, but needed driving power is generally 50W even higher.In the application scenario of high-power high-gain, can not be with the acoustooptic Q-switching of an one dimension mode effectively to laser cut-out, adopted the existing result [1] [2] preferably of method of two parallel to each other or orthogonal acoustooptic Q-switchings of in chamber placement.But, because of having increased an insertion element, increased the insertion loss of system, it is very big to take up room simultaneously.Britain GOOCH﹠amp; The up-to-date two-way acoustooptic Q-switching [3] of developing the sound p-wave model of HOUSEGO company unites two into one two devices, has obtained good result of use.In single mode, polarization solid state laser Q-regulating technique, because incident light vertical polarization component generally reaches 90% even higher, the injection mode that requires the acoustooptic Q-switching sound wave is the capable ripple of longitudinal mode, just can obtain high diffraction loss with less driving power.Yet, single-mode laser can not reach 100% complete orthogonal polarized light, its vertical polarization part also can not be finished 100% diffraction loss by this compressional wave, at this moment, if same participation of sound shear wave that exists on another direction improved modulation loss to the vertical polarization diffraction of light.In like manner, though multimode laser is a characteristic with circular polarization or elliptical polarization, though and the sound shear wave is insensitive to its incident light polarization state, but the light intensity to the vertical polarization component also can not realize 100% diffraction modulation, at this moment, if existence sound compressional wave participates in the mutual effect of orthogonal polarized light improved total diffraction modulation too on another direction.Therefore, no matter adopt the two-way acoustooptic Q-switching of compressional wave unidirectional or that sound pattern is identical, transfer among the Q in high-power, high gain lasers all to have certain limitation.
The utility model content
The purpose of this utility model is at above-mentioned the deficiencies in the prior art, and a kind of modulation loss height is provided, and insertion element is few, and low cost of manufacture is very suitable for the same medium two dimension acoustooptic Q-switching that high power, high-gain Q-switched laser use.
For achieving the above object, the utility model adopts following technical scheme:
Of the present utility model with medium two dimension acoustooptic Q-switching, comprise acousto-optic medium, sound absorber, computer, also comprise the compressional wave transducer, shear wave transducer, the LC matching network, high-frequency socket, driving power, temperature detect switch (TDS), sound absorber, described computer is connected with driving power by its synchronizing signal, driving power is connected with high-frequency socket, high-frequency socket is connected with the LC matching network, LC matching network and compressional wave transducer, shear wave transducer connects, the compressional wave transducer, shear wave transducer connects with acousto-optic medium, temperature detect switch (TDS) is connected with driving power, and sound absorber is glued on the acousto-optic medium.
Wherein, described compressional wave transducer, shear wave transducer are barrier shape, and wherein, the compressional wave transducer is positioned at the Y plane of acousto-optic medium, and shear wave transducer is positioned at the X plane of acousto-optic medium.
Wherein, described compressional wave transducer, shear wave transducer are lithium columbate crystal.
Wherein, described compressional wave transducer, shear wave transducer connect with acousto-optic medium by welding.
Wherein, described LC matching network, high-frequency socket, driving power are two covers, are respectively applied for to drive compressional wave transducer, shear wave transducer.
Wherein, described sound absorber is a wedge, is glued at the opposite on acousto-optic medium Y plane and the opposite on X plane.The propagation of ultrasonic wave in medium that compressional wave transducer, shear wave transducer produce is the row ripple, and it is to be realized by the sound absorber that sound wave generation opposite side is installed.
Advantage of the present utility model is: 1) because the diffraction loss that adopts cross modulation to cause increases total diffraction loss, when being used for laser, the laser energy of " Q " sudden change output is stronger; 2) insertion element reduces, and manufacturing cost reduces, and is very suitable for high power, the high-gain Q-switched laser; 3) the utility model make full use of compressional wave at the little and high harmony shear wave of modulation loss of the required driving power of incident light vertical polarization component to the insensitive advantage of random polarization light incident, on a medium, design and produce a kind of novel two-dimentional acoustooptic Q-switching dexterously, obtain the higher product of modulation loss with expectation, thereby provide a kind of new mentality of designing for the laser Q-switch.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
The block diagram that Fig. 2 forms for the utility model;
Fig. 3 is the schematic diagram of the utility model LC matching network;
Fig. 4 is the utility model diffraction light geometric distributions and spectral characteristic.
Among the figure: 1, fused quartz medium; 2, compressional wave transducer; 3, shear wave transducer; 4, sound absorber; 5, LC matching network; 6, high-frequency socket; 7, driving power; 8, temperature detect switch (TDS); 9, computer; 10, apply the copper tin coating; I
λ, incident intensity; I
0, diffraction intensity not; I
d, the total diffraction intensity of two dimension; I
X1, sound shear wave and light mutual effect the first-order diffraction light intensity; I
X2, sound shear wave and light mutual effect the second-order diffraction light intensity; I
Y1, sound compressional wave and light mutual effect the first-order diffraction light intensity; The second-order diffraction light intensity of Iy2, sound compressional wave and light mutual effect; I
Xy, I
/ Xy, two kinds of sound waves and light wave the cross modulation diffraction intensity that produces of repeatedly composite action; ω
0, the incident light frequency; f
y, sound longitudinal frequency; f
x, sound shear wave frequency; L
X, L
Y, inductance; C
X, C
Y, electric capacity.
Embodiment
Following examples are used to illustrate the utility model, but are not used for limiting protection range of the present utility model.
Referring to Fig. 1, Fig. 2, of the present utility model a kind of with medium two dimension acoustooptic Q-switching, form by fused quartz medium 1, compressional wave transducer 2, shear wave transducer 3, sound absorber 4, LC matching network 5, high-frequency socket 6, driving power 7, temperature detect switch (TDS) 8, computer 9, wherein:
Referring to Fig. 1, incident intensity enters fused quartz acousto-optic medium 1 along the Z direction; Compressional wave transducer 2 is welded on the Y face of medium, shear wave transducer 3 is welded on the X face of fused quartz medium 1, it is vertical each other with two to constitute a light wave, and the light intensity diffraction on two-dimensional directional and XY plane is finished in the interaction of ultrasonic wave in fused quartz acousto-optic medium 1 that pattern is different.Diffraction loss is big more, and the effect of laser Q-switching is good more.
Referring to Fig. 1, Fig. 2, Fig. 3, the utility model carries out the pulse switch modulation by the signal controlling part to two driving powers 7; Two driving powers 7 are exported radio-frequency power respectively, are 2m with 2 length, and impedance operator is that the high frequency transmission line of 50 Ω is connected with two high-frequency sockets 6 of equal characteristic impedance; Two LC matching networks 5 are made of inductance L respectively the element of different inductance and capacitance
X, L
Y, capacitor C
X, C
YBe connected across and apply on the copper tin coating, see Fig. 3, be connected on the sound compressional wave transducer 2 harmony shear wave transducers of being made by lithium columbate crystal 3 by spun gold, the effect of transducer is equivalent to an electroacoustic transducer; Model be the fused quartz 1 of JGS1 as acousto-optic medium, it is sound and light mutually movable " public place "; Sound absorber is made up of fused quartz wedge and sound-absorbing material, heat-conducting glue, is glued at the opposite that transducer produces sound wave, and effect is to eliminate reflection echo, and guarantees that sonic propagation is 45 degree wedge shapes for row ripple, sound absorber in the medium; Temperature detect switch (TDS) 8 is the PIPEN of a u s company type, when two-dimentional acoustooptic Q-switching device is set temperature rise above allowed band, plays the function of automatic cut-out driving power 7 power output, effectively protects equipment operation safety.
Operation principle of the present utility model: driving power 7 output radio-frequency powers also are transferred on two transducers 2,3, transducer 2,3 is converted to ultrasonic power with electrical power and is transferred in the acousto-optic medium, owing to deformation takes place elasto-optical effect, produce " phase grating ".Laser beam is changed generation diffraction or diffraction by the direction of propagation part in the grating time in the medium.In the utility model, two-dimentional acoustooptic Q-switching is inserted in the continuous laser chamber, regulate the Bragg angle of X and Y direction, just can obtain the diffraction intensity of both direction and XY plane the best.When pulse signal was high level, the power of driving power 7 converted the diffraction that ultrasonic power causes laser to by transducer 2,3, and this moment, cavity loss made the laser quencher and noenergy output greater than gain is instantaneous, and this process is called the laser energy savings phase; When pulse signal is zero level, driving power 7 inactivitys output, and then transducer 2,3 do not produce ultrasonic power yet, the laser by fused quartz acousto-optic medium 1 is because of no diffraction loss thus, abrupt release goes out the laser of high level and realizes " Q " sudden change producing huge pulse energy.As energy carrier, by the various information Control driving powers of computer internal control software programming, the transmission relevant information that acoustooptic Q-switching of the present utility model just can be loyal can realize Chinese character, character, functions such as chart in the laser industrial equipment with laser.Laser marking machine, equipment such as laser resistance adjuster are realized according to above-mentioned accent Q principle, have obtained using widely in industrial processes.
Referring to Fig. 4, I
λBe incident intensity (polarization/non-polarized light); I
0Be diffraction intensity not; I
dBe total diffraction intensity of two dimension and I
d=(I
X1+ I
X2+ I
Y1+ I
Y2+ I
Xy+ I '
Xy).Wherein: I
X1And I
X2Be respectively the firsts and seconds diffraction intensity of shear wave and light mutual effect; I
Y1And I
Y2Be respectively the firsts and seconds diffraction intensity that compressional wave and light mutual effect produce; I
XyAnd I '
XyBe respectively the cross modulation diffraction intensity of the repeatedly composite action generation of two kinds of sound waves and light.Operation principle is: with the drive source carrier frequency is f
ySound compressional wave and frequency be ω
0Polarization or unpolarized incident light vertical component effectively mutual effect taking place and produces I
Y1Diffraction and I
Y2The secondary diffraction, and unpolarized institute's important (comprising vertical component) is f with frequency
xSound shear wave mutual effect produce I
X1And I
X2Optical diffraction.Simultaneously, f
xAnd f
yPolarization and complex superposition cross modulation with light wave have produced I
XyAnd I '
XyAdditional diffraction loss.Can see thus: the result of two vertical each other sound waves and light mutual effect is equivalent to two functions that independent acoustooptic Q-switching played, and the diffraction loss that cross modulation causes then is extra results.Therefore total diffraction loss increases, and the laser energy of " Q " sudden change output is stronger, and insertion element reduces, and manufacturing cost reduces, and is very suitable for high power, the high-gain Q-switched laser.
Experimental result of the present utility model is as follows:
The utility model has been made the acoustooptic Q-switching of speak longitudinal mode and shear line ripple on same acousto-optic medium, acousto-optic medium is a fused quartz, transducer is a lithium columbate crystal, operating frequency is all 27.12MHz, effective clear aperature 6mm, 1.064 optics percent of pass＞99.7% of μ m, standing-wave ratio＜1.2: 1.The driving power power output is 2 * 50W, and pulse recurrence rate is 0.5-50KHz.Test is the Nd:YAG multimode laser with laser, and continuous light power is 58W.The combination property of device is after tested: diffraction loss＞80%, insert loss＜3%.With the 5KHz pulse frequency laser Q-switching is tested, laser is effectively turn-offed, and the picture and text treatment effect is splendid.
The prior art list of references relevant with the utility model:
1, Zhang Zehong, Chen literary friend: The Two Dimensional Acoustooptic Q Switch." piezoelectricity and acousto-optic " 1998.No.1.P20;
2, Li Qiang, Zheng Yijun etc.: Double Acousto-optic Devices Two-dimensional Q-switch." piezoelectricity and acousto-optic " 2003.No.3P25;
3、GOOCH&HOUSEGO“Acousto-optic?super?Q-Switch?Instruction?manual”June?2006。
Claims (6)
1, a kind of with medium two dimension acoustooptic Q-switching, comprise acousto-optic medium, computer, it is characterized in that: also comprise the compressional wave transducer, shear wave transducer, the LC matching network, high-frequency socket, driving power, temperature detect switch (TDS), sound absorber, described computer is connected with driving power by its synchronizing signal, driving power is connected with high-frequency socket, high-frequency socket is connected with the LC matching network, LC matching network and compressional wave transducer, shear wave transducer connects, the compressional wave transducer, shear wave transducer connects with acousto-optic medium, temperature detect switch (TDS) is connected with driving power, and sound absorber is glued on the acousto-optic medium.
2, as claimed in claim 1 a kind of with medium two dimension acoustooptic Q-switching, it is characterized in that: described compressional wave transducer, shear wave transducer are trapezoidal shape, wherein, the compressional wave transducer is positioned at the Y plane of acousto-optic medium, and shear wave transducer is positioned at the X plane of acousto-optic medium.
3, as claimed in claim 1 a kind of with medium two dimension acoustooptic Q-switching, it is characterized in that: described compressional wave transducer, shear wave transducer are lithium columbate crystal.
4, as claimed in claim 1 a kind of with medium two dimension acoustooptic Q-switching, it is characterized in that: described compressional wave transducer, shear wave transducer connect with acousto-optic medium by welding.
5, as claimed in claim 1 a kind of with medium two dimension acoustooptic Q-switching, it is characterized in that: described LC matching network, high-frequency socket, sound absorber, driving power, be two covers, be respectively applied for and drive compressional wave transducer, shear wave transducer.
6, as claimed in claim 1 or 2 a kind of with medium two dimension acoustooptic Q-switching, it is characterized in that: described sound absorber is a wedge, is glued at the opposite on acousto-optic medium Y plane and the opposite on X plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200868236U CN201118091Y (en) | 2007-09-05 | 2007-09-05 | Same medium two-dimensional acousto-optic Q switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200868236U CN201118091Y (en) | 2007-09-05 | 2007-09-05 | Same medium two-dimensional acousto-optic Q switch |
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| Publication Number | Publication Date |
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| CN201118091Y true CN201118091Y (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200868236U Expired - Lifetime CN201118091Y (en) | 2007-09-05 | 2007-09-05 | Same medium two-dimensional acousto-optic Q switch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311795A (en) * | 2013-06-18 | 2013-09-18 | 中国电子科技集团公司第二十六研究所 | Two-dimensional acousto-optic q-switch |
| CN103500918A (en) * | 2013-10-21 | 2014-01-08 | 中国电子科技集团公司第二十六研究所 | Multi-channel acousto-optic Q-Switch |
-
2007
- 2007-09-05 CN CNU2007200868236U patent/CN201118091Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311795A (en) * | 2013-06-18 | 2013-09-18 | 中国电子科技集团公司第二十六研究所 | Two-dimensional acousto-optic q-switch |
| CN103311795B (en) * | 2013-06-18 | 2015-05-13 | 中国电子科技集团公司第二十六研究所 | Two-dimensional acousto-optic q-switch |
| CN103500918A (en) * | 2013-10-21 | 2014-01-08 | 中国电子科技集团公司第二十六研究所 | Multi-channel acousto-optic Q-Switch |
| CN103500918B (en) * | 2013-10-21 | 2016-02-17 | 中国电子科技集团公司第二十六研究所 | A kind of multi-channel acousto-optic Q-Switch |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080917 |
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| CX01 | Expiry of patent term |