CN102545015A - Dual-frequency laser - Google Patents
Dual-frequency laser Download PDFInfo
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- CN102545015A CN102545015A CN2010106192859A CN201010619285A CN102545015A CN 102545015 A CN102545015 A CN 102545015A CN 2010106192859 A CN2010106192859 A CN 2010106192859A CN 201010619285 A CN201010619285 A CN 201010619285A CN 102545015 A CN102545015 A CN 102545015A
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Abstract
The invention relates to a dual-frequency laser which comprises a single-frequency laser, a first polarized beam splitting prism, a first drive, a first acousto-optic device, a second polarized beam splitting prism, a second drive, a second acousto-optic device and a beam expanding lens; the first drive sends a first driving signal with the frequency being fs1 to the first acousto-optic device, the second drive sends a second driving signal with the frequency being fs2 to the second acousto-optic device, so that the first acousto-optic device and the second acousto-optic device respectively form a Bragg grating; the laser with the frequency being f0 which is sent by the single-frequency laser is divided into two polarized beams which are mutually vertical by the first polarized beam splitting prism, wherein a first beam enters the first acousto-optic device and outputs the light with the frequency being f0+fs1, and the second beam enters the second acousto-optic device and outputs the light with the frequency being f0+fs2; and the light which comes out from the first and the second acousto-optic devices is combined by the second polarized beam splitting prism and is output by the beam expanding lens, and the difference between the frequency of the output light is fs1-fs2.
Description
Technical field
The present invention relates to laser technology field, relate in particular to a kind of two-frequency laser.
Background technology
Two-frequency laser can be used for the double-frequency laser interferometry field, measures such as ultraprecise phase place and displacement measurement, optical element and blooming, the research that also can be used for forming the two-frequency laser array or be used for communication optical fiber etc.
The method that produces double-frequency laser at present mainly contains Zeeman splitting technology harmony light modulation techniques.
Adopt the two-frequency laser of Zeeman splitting technology very ripe, have ripe product.But adopt the two-frequency laser of Zeeman splitting technology all to have a common shortcoming: frequency difference generally is no more than 4.0MHz, and this can not satisfy the increasingly high ultraprecise displacement measurement of measuring speed.As everyone knows; The maximum detection amount speed of double-frequency laser interferometry system and the output frequency difference of two-frequency laser are directly proportional; Such as highest measurement speed is 1m/s, adopts the interferometer of 4 times of segmentations to measure, and requires two-frequency laser output frequency difference 6.3MHz at least.Therefore, adopt the two-frequency laser of Zeeman splitting technology can't satisfy measurement at a high speed.
Opposite with the two-frequency laser of Zeeman splitting, adopt the two-frequency laser of acoustooptic modulation technology, its output frequency difference is then too big, is generally tens MHz, and this mainly is that characteristic by the acousto-optic frequency shifter determines.This frequency difference up to tens MHz brings very big difficulty can for the processing of circuit system, needs special Circuits System to handle, and has increased the difficulty and the cost of Circuits System greatly.For the double-frequency laser interferometry system, only frequency difference will be 3MHz～15MHz, even according to the measurement demand, and it is adjustable to carry out frequency difference.
Summary of the invention
The object of the present invention is to provide a kind of two-frequency laser, wherein, used two acousto-optic frequency shifters parallel with one another, single-frequency laser is modulated, and the final orthogonal double-frequency laser of output polarization attitude, its frequency difference is adjustable within a large range.
A kind of two-frequency laser comprises single frequency laser, first polarization splitting prism, first driver, first acousto-optical device, second polarization splitting prism, second driver, rising tone optical device and beam expanding lens; Said first driver sends first drive signal that frequency is fs1 to said first acousto-optical device; Said second driver sends second drive signal that frequency is fs2 to said rising tone optical device, makes said first and second acousto-optical devices form a Bragg grating respectively; The frequency that said single frequency laser sends is that the laser of f0 is divided into orthogonal two bundles of polarization state via said first polarization splitting prism; First bundle is incident to said first acousto-optical device; Output frequency is the light of f0+fs1, and second bundle is incident to said rising tone optical device, and output frequency is the light of f0+fs2; Close Shu Houjing from the light of the said first and second acousto-optical device outgoing via said second polarization splitting prism and exported by said beam expanding lens, the difference of output light frequency is fs1-fs2.
Wherein, the frequency adjustable of the drive signal of said first driver or the output of said second driver.
Wherein, the angle of acousto-optical device and incident light is a Bragg angle.
Wherein, when the single frequency laser polarization light output, put a quarter-wave plate in first polarization splitting prism the place ahead.
Wherein, said single frequency laser is a stabilized single-frequency laser.
Wherein, the light that sends of said single frequency laser transmits through light-conductive optic fibre.
Two polarization splitting prisms of the present invention, two acousto-optic frequency shifters and a beam expanding lens are formed modulation module jointly.The light beam of single frequency laser output can be transported to modulation module through light-conductive optic fibre.Therefore in use, can be placed on place by the single frequency laser that caloric value is big, only need all very little modulation module of quality of regulation and caloric value, have advantage easy to use away from measured zone.
Two-frequency laser of the present invention has the following advantages: 1. the output frequency difference is moderate, adjustable; 2. modulation module separates with laser, is convenient to regulate; 3. can the heat of laser not introduced measured zone, be convenient to improve the certainty of measurement of interferometer measuration system.Therefore can be used as the perfect light source of double-frequency laser interferometry system.
Description of drawings
Through the embodiment of the invention and combine the description of its accompanying drawing, can further understand purpose, specific structural features and the advantage of its invention.Wherein, accompanying drawing is:
Shown in Figure 1 is Prague acoustooptic diffraction principle;
Shown in Figure 2 is the structural representation of laser according to an embodiment of the invention;
Shown in Figure 3 is the distortion of Fig. 2.
Embodiment
Below, describe in detail according to a preferred embodiment of the invention in conjunction with accompanying drawing.For the ease of describing and the outstanding the present invention of demonstration, omitted existing associated components in the prior art in the accompanying drawing, and will omit description these well-known components.
As everyone knows, when ultrasonic wave passed medium, produce periodically elastic deformation within it, thereby make the refractive index of medium produce cyclic variation, be equivalent to a mobile phase grating, be called acoustooptical effect.If have light to pass medium simultaneously, light will be called acoustooptic diffraction by phase grating institute diffraction.The device that utilizes the acoustooptic diffraction effect to process is called acousto-optical device.Acousto-optical device can fast and effeciently be controlled intensity of laser beam, direction and frequency.
As shown in Figure 1, when incident light during, can produce Bragg diffraction with a special angle (being Bragg angle) incident, wherein the non-diffracted light frequency is constant, and 1 grade of (or-1 grade) diffraction light frequency drifts about, the frequency shift amount ω of diffraction light
sEqual frequency of ultrasonic.
The present invention just is based on above-mentioned Bragg diffraction effect, and the two-frequency laser by two acousto-optic frequency shifter parallel connections is provided.Shown in Figure 2ly be two-frequency laser according to an embodiment of the invention, this laser comprises devices such as single frequency laser 1, optical fiber collimator 2, light-conductive optic fibre 3, optical fiber collimator 4, quarter-wave plate 5, polarization splitting prism 6, driver 7, acousto-optical device 8, polarization splitting prism 9, speculum 10, acousto-optical device 11, driver 12, speculum 13 and beam expanding lens 14.Wherein driver 7 is formed a cover acousto-optic frequency shifter with acousto-optical device 8, and driver 12 is formed another set of acousto-optic frequency shifter with acousto-optical device 11, two cover acousto-optic frequency shifter parallel connections.Said single frequency laser 1 is used to produce single-frequency laser, according to user demand, this single frequency laser can frequency stabilization also can not frequency stabilization.
As shown in Figure 2, the laser frequency that single frequency laser 1 sends is f0, gets into light-conductive optic fibre 3 through fiber coupler 2, and through optical fiber collimator 4 outputs.If what single frequency laser 1 sent is linearly polarized light, then make it become circularly polarized light through quarter-wave plate 5, if single frequency laser 1 sends is random polarization, then need not use quarter-wave plate 5.The laser of f0 gets into polarization splitting prism 6 through after the quarter-wave plate, is divided into two bundles that energy equates: the direction of vibration P polarised light parallel with light splitting surface is by transmission, and the S polarised light that direction of vibration is vertical with light splitting surface is reflected.The P polarised light is incident to acousto-optical device 8 with Prague angle, and the S polarised light is through being incident to acousto-optical device 11 with Prague angle after the speculum 10.
It is signal to the acousto-optical device 8 of fs1 that driver 7 produces frequencies, and the transducer through acousto-optical device 8 produces frequency and is the ultrasonic wave of fs1 and passes acousto-optic crystal, forms Bragg grating.The P polarised light is through after the acousto-optical device 8, and its first-order diffraction light frequency becomes f0+fs1.
It is signal to the acousto-optical device 11 of fs2 that driver 12 produces frequencies, and the transducer through acousto-optical device 11 produces frequency and is the ultrasonic wave of fs2 and passes acousto-optic crystal, forms Bragg grating.The S polarised light is through after the acousto-optical device 11, and its first-order diffraction light frequency becomes f0+fs2.
Frequency is that the laser of f0+fs2 is that the laser of f0+fs1 converges through getting into polarization splitting prism 9 and frequency after the speculum 13.Accommodation reflex mirror 13, making frequency is that f0+fs2 and frequency are that the laser of f0+fs1 overlaps and to be a branch of light output, and polarization state is vertical each other.For the ease of using, can adopt 14 pairs of laser beams of beam expanding lens to carry out beam-expanding collimation usually.The difference of two frequencies of final output laser is:
Δf＝(f
0+f
s1)-(f
0+f
s2)＝f
s1-f
s2
Through selecting two different driving frequencies, can obtain suitable output frequency difference f
S1-f
S2Perhaps select adjustable driver for use, make the output frequency of one of them driver adjustable, thereby realize output frequency difference f
S1-f
S2Adjustable.The concrete data of following substitution are carried out example.
Stabilizing He Ne laser 1 is sent the linearly polarized light that wavelength is 632.8nm, and its frequency is 4.74 * 10
8MHz gets into light-conductive optic fibre 3 through fiber coupler 2, and through optical fiber collimator 4 outputs, makes it become circularly polarized light through quarter-wave plate 5.Get into polarization splitting prism 6 then, be divided into two bundles that energy equates: the direction of vibration P polarised light parallel with light splitting surface is by transmission, and the S polarised light that direction of vibration is vertical with light splitting surface is reflected.The P polarised light is incident to acousto-optical device 8 with Prague angle α=0.5 °, and the S polarised light is through being incident to acousto-optical device 11 with negative Prague angle-α=-0.5 ° after the speculum 10.
It is signal to the acousto-optical device 8 of 100MHz that driver 7 produces frequencies, and the transducer through acousto-optical device 8 produces frequency and is the ultrasonic wave of 100MHz and passes acousto-optic crystal, forms Bragg grating.The P polarised light is through after the acousto-optical device 8, and its first-order diffraction light frequency becomes (4.74 * 10
8+ 100) MHz.
It is signal to the acousto-optical device 11 of 108MHz that driver 12 produces frequencies, and the transducer through acousto-optical device 11 produces frequency and is the ultrasonic wave of 108MHz and passes acousto-optic crystal, forms Bragg grating.The S polarised light is through after the acousto-optical device 11, and its first-order diffraction light frequency becomes (4.74 * 10
8+ 108) MHz.
Frequency is (4.74 * 10
8+ 108) laser of MHz is (4.74 * 10 through getting into polarization splitting prism 9 after the speculum 13 with frequency
8+ 100) laser of MHz converges.Through accommodation reflex mirror 13, can make frequency is (4.74 * 10
8+ 108) MHz and frequency are (4.74 * 10
8+ 100) laser of MHz overlaps and is a branch of light output, and polarization state is vertical each other.The difference of two frequencies of output laser is:
Δf＝(4.74×10
8+108)-(4.74×10
8+100)＝8MHz
Under situation without departing from the spirit and scope of the present invention, can also constitute many very structures of big difference that have, be exactly one of them like Fig. 3.Wherein, through changing the position of speculum 13, make the angle of outgoing beam change 90 °.
Described in this specification is several kinds of preferred embodiment of the present invention, and above embodiment is only in order to explain technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within scope of the present invention under this invention's idea through the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (6)
1. a two-frequency laser comprises single frequency laser, first polarization splitting prism, first driver, first acousto-optical device, second polarization splitting prism, second driver, rising tone optical device and beam expanding lens; Said first driver sends first drive signal that frequency is fs1 to said first acousto-optical device; Said second driver sends second drive signal that frequency is fs2 to said rising tone optical device, makes said first and second acousto-optical devices form a Bragg grating respectively; The frequency that said single frequency laser sends is that the laser of f0 is divided into orthogonal two bundles of polarization state via said first polarization splitting prism; First bundle is incident to said first acousto-optical device; Output frequency is the light of f0+fs1, and second bundle is incident to said rising tone optical device, and output frequency is the light of f0+fs2; Close Shu Houjing from the light of the said first and second acousto-optical device outgoing via said second polarization splitting prism and exported by said beam expanding lens, the difference of output light frequency is fs1-fs2.
2. two-frequency laser according to claim 1 is characterized in that, the frequency adjustable of the drive signal of said first driver or the output of said second driver.
3. two-frequency laser according to claim 2 is characterized in that, the angle of acousto-optical device and incident light is a Bragg angle.
4. two-frequency laser according to claim 3 is characterized in that, when the single frequency laser polarization light output, puts a quarter-wave plate in first polarization splitting prism the place ahead.
5. two-frequency laser according to claim 4 is characterized in that, said single frequency laser is a stabilized single-frequency laser.
6. according to any described two-frequency laser among the claim 1-5, it is characterized in that the light that said single frequency laser sends transmits through light-conductive optic fibre.
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| CN2010106192859A CN102545015A (en) | 2010-12-31 | 2010-12-31 | Dual-frequency laser |
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|---|---|---|---|
| CN2010106192859A CN102545015A (en) | 2010-12-31 | 2010-12-31 | Dual-frequency laser |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928836A (en) * | 2014-04-08 | 2014-07-16 | 中国科学院武汉物理与数学研究所 | All-solid-state laser capable of outputting three kinds of frequencies |
| CN105783949A (en) * | 2016-05-28 | 2016-07-20 | 中国航空工业集团公司北京长城计量测试技术研究所 | Common-light-path heterodyne laser interference measuring system |
| WO2016151373A1 (en) * | 2015-03-21 | 2016-09-29 | Uniwersytet Jagielloński | Process for controlling the state of light polarization and system for its implementation |
| CN115621826A (en) * | 2022-12-19 | 2023-01-17 | 中国工程物理研究院应用电子学研究所 | Power ratio adjustable double-frequency laser and use method |
| CN116111434A (en) * | 2023-04-13 | 2023-05-12 | 山东科技大学 | Green light double-frequency laser system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533096A (en) * | 2009-04-23 | 2009-09-16 | 哈尔滨工业大学 | Dual-frequency laser ranging method and device based on polarization state regulation and wavelength synthesis |
-
2010
- 2010-12-31 CN CN2010106192859A patent/CN102545015A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533096A (en) * | 2009-04-23 | 2009-09-16 | 哈尔滨工业大学 | Dual-frequency laser ranging method and device based on polarization state regulation and wavelength synthesis |
Non-Patent Citations (1)
| Title |
|---|
| 刘唤唤: "布拉格声光衍射场光强空间分布不均匀的研究", 《电子科技》, vol. 23, no. 3, 15 March 2010 (2010-03-15) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928836A (en) * | 2014-04-08 | 2014-07-16 | 中国科学院武汉物理与数学研究所 | All-solid-state laser capable of outputting three kinds of frequencies |
| CN103928836B (en) * | 2014-04-08 | 2016-07-27 | 中国科学院武汉物理与数学研究所 | The all solid state laser of exportable three kinds of frequencies |
| WO2016151373A1 (en) * | 2015-03-21 | 2016-09-29 | Uniwersytet Jagielloński | Process for controlling the state of light polarization and system for its implementation |
| CN105783949A (en) * | 2016-05-28 | 2016-07-20 | 中国航空工业集团公司北京长城计量测试技术研究所 | Common-light-path heterodyne laser interference measuring system |
| CN115621826A (en) * | 2022-12-19 | 2023-01-17 | 中国工程物理研究院应用电子学研究所 | Power ratio adjustable double-frequency laser and use method |
| CN116111434A (en) * | 2023-04-13 | 2023-05-12 | 山东科技大学 | Green light double-frequency laser system |
| CN116111434B (en) * | 2023-04-13 | 2023-08-18 | 山东科技大学 | Green light double-frequency laser system |
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Application publication date: 20120704 |