CN102780154A - Frequency difference generation and assignment method for helium neon dual-frequency laser - Google Patents
Frequency difference generation and assignment method for helium neon dual-frequency laser Download PDFInfo
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- CN102780154A CN102780154A CN2012102752530A CN201210275253A CN102780154A CN 102780154 A CN102780154 A CN 102780154A CN 2012102752530 A CN2012102752530 A CN 2012102752530A CN 201210275253 A CN201210275253 A CN 201210275253A CN 102780154 A CN102780154 A CN 102780154A
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Abstract
The invention relates to a frequency difference generation and assignment method for a helium neon dual-frequency laser. The method comprises the following steps of: 1) setting a measuring system including a dual-frequency laser, a laser engraving machine and a computer, wherein an output mirror of the dual-frequency laser is a stress birefringence mirror; 2) adding a magnetic field in the vertical shaft direction of the dual-frequency laser before laser engraving is performed, starting the dual-frequency laser, testing and marking polarization directions of two beams of polarized light which is output by the dual-frequency laser, and determining that the direction of the frequency difference is correspondingly increased when the stress is increased; 3). adjusting a position between the laser engraving machine and the stress birefringence mirror so that incident light of the laser engraving machine is vertical to the stress birefringence mirror; and adjusting the direction of a light-emission point of the laser engraving machine so that the light-emission point is focused in the thickness center of the stress birefringence mirror; 4). inputting a pattern to be engraved into the computer; and 5) starting the laser engraving machine, controlling and adjusting relevant parameters, and controlling the laser engraving machine by the computer to engrave the pattern into the stress birefringence mirror. The method can be widely used for heterodyne dual-frequency laser interferometer and other laser technical fields.
Description
Technical field
The present invention relates to a kind of two-frequency laser frequency difference and produce and assignment method, particularly produce and assignment method about a kind of He-Ne two-frequency laser frequency difference.
Background technology
Because He-Ne (HeNe) laser has good frequency stability, have in fields such as range measurement, tachometric survey, vibration measurement and topography measurements very widely as the double frequency heterodyne ineterferometer of light source with the He-Ne two-frequency laser and to use.The He-Ne two-frequency laser is generally exported the pairwise orthogonal linearly polarized light: O light and E light; The difference of two linear polarization light frequencies is a longitudinal mode spacing (hundreds of～several thousand MHz); When adding the magnetic field about 200 Gausses perpendicular to the laser axis direction; Because transverse zeeman effect and " mode pulling ", every Shu Guanghui are split into two bundle orhtogonal linear polarizaiton light: the direction of vibration of П light is parallel to magnetic field, and the direction of vibration of σ light is then perpendicular to magnetic field.When being parallel to the laser axis direction and adding magnetic field, because longitudinal Zeeman effect, every Shu Guang will be split into the circularly polarized light of two bundle quadratures: left circularly polarized light and right-circularly polarized light.The difference of the pairwise orthogonal linear polarization light frequency that common helium neon laser is exported under transverse zeeman effect is generally less than 1MHz; The difference of the pairwise orthogonal circular polarization light frequency of exporting under the longitudinal Zeeman effect generally is not more than 3MHz.In addition, adopt the crystal birefringence element can produce the above large frequency-difference of 40MHz, but principle is limit the frequency difference that can not produce below the 40MHz, and high-frequency signal is also quite complicated when follow-up processing of circuit.
Available technology adopting stress birfringence mirror is as the outgoing mirror of He-Ne two-frequency laser; Be equivalent in the chamber, insert birefringence element; The two bunch polarised light П light of transverse zeeman effect output and the difference of σ light frequency generally do not wait at several MHz～tens MHz; But because the problem of technology, the difference of П light and σ light frequency has arbitrariness, can not control; Adopt the He-Ne two-frequency laser of stress birfringence mirror as outgoing mirror; Because the stress intensity of stress birfringence mirror itself has uncertainty; Can export the frequency difference of hundreds of KHz～tens MHz size accordingly, but can not accurately control and in the double frequency heterodyne ineterferometer.The light source frequency difference is that the application of 5～10MHz is optimum, optimal selection, and therefore the He-Ne two-frequency laser of 3～40MHz frequency difference was once becoming the blank in double-frequency laser field.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide a kind of according to the stress intensity in the demand adjustment outgoing mirror, for the He-Ne two-frequency laser frequency difference of frequency difference assignment in 3MHz～40MHz scope of He-Ne two-frequency laser output produces and assignment method.
For realizing above-mentioned purpose; The present invention takes following technical scheme: a kind of He-Ne two-frequency laser frequency difference produces and assignment method; May further comprise the steps: 1) be provided with one and include He-Ne two-frequency laser, laser engraving machine and system for computer, the outgoing mirror of the resonant cavity of said He-Ne two-frequency laser is the stress birfringence mirror; 2) before the laser engraving, the vertical direction of principal axis of He-Ne two-frequency laser is added magnetic field, test and indicate the polarization direction of He-Ne two-frequency laser output two bundle polarised lights, and definite stress is when increasing, frequency difference is the direction of corresponding increase also; 3) position between adjustment laser engraving machine and the stress birfringence mirror makes the incident light of laser engraving machine vertical with the stress birfringence minute surface, and adjusts the direction that laser engraving machine goes out luminous point, makes it focus on the mid-depth place in the stress birfringence mirror; 4) pattern with required engraving is input in the computer; 5) start said laser engraving machine; According to the required He-Ne two-frequency laser frequency difference size of obtaining; The degree of size, volume and the gasification of the pumping current of control laser engraving machine, the fried point of pattern; And regulate the distance that the fried point of institute's depiction and said laser engraving machine center go out luminous point, said computer control swashs said smooth engraving machine pattern is carved in said stress birfringence mirror.
The adjustment laser engraving machine goes out the direction of luminous point in the said step 3); Will avoid the highly reflecting films layer of stress birfringence mirror when making it focus on the mid-depth in the stress birfringence mirror, the distance that laser engraving machine goes out the highly reflecting films layer center of circle of spot distance stress birfringence mirror is 2～5mm.
The shape of pattern or size are confirmed according to required generation frequency difference size in the said step 4).
Surpass predetermined value or during when the frequency difference that produces in the said step 5) less than predetermined value; Pumping current through reducing laser engraving machine, change method that depiction goes out the distance of luminous point apart from the laser engraving machine center or regulate the fried point of pattern and take off stress or append stress and control, the direction that takes off stress is vertical with the direction of appending stress.
The present invention is owing to take above technical scheme; It has the following advantages: 1, the present invention adopts laser engraving machine in the stress birfringence mirror of He-Ne two-frequency laser, to carve some pattern, makes the inner fried point of gasification that forms of stress birfringence mirror, owing to the fried point of these gasifications is fixed in the stress birfringence mirror; Thereby form more stable internal stress; Make the He-Ne two-frequency laser can export relatively more stable frequency difference, and these residual stresss can not disappear in time gradually, ageing strong.2, the present invention can be through the pumping current of control laser engraving machine, the degree that pattern explodes size, volume and the gasification of point; Fried point of depiction and laser go out the internal stress of the controlling factors stress birfringence mirrors such as distance between the luminous point; And then the frequency difference size of regulating the output of He-Ne two-frequency laser; And can revise adjustment through taking off stress and appending stress to frequency difference according to the frequency difference output result of He-Ne two-frequency laser; Can obtain the He-Ne two-frequency laser of frequency difference in 3MHz～40MHz scope, fill up the blank in double-frequency laser field, remedy that two-frequency laser output frequency difference can not be revised and shortcoming such as control.The present invention goes for full inner chamber helium neon laser, also applicable to half external cavity helium neon laser, is widely used in heterodyne system two-frequency laser interferometer and other laser technology field.
Description of drawings
Fig. 1 is that outgoing mirror of the present invention is the structural representation of the He-Ne two-frequency laser of stress birfringence mirror;
Fig. 2 is the sketch map that the present invention adopts laser engraving method depiction on outgoing mirror;
Fig. 3 is the schematic side view of Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
As shown in Figure 1, existing helium neon laser includes glass shell 1, cathode tube 2, capillary 3, completely reflecting mirror 4 and outgoing mirror 5, and outgoing mirror 5 adopts the stress birfringence mirror; Completely reflecting mirror 4 utilizes the high intermediate temperature sealing of glass powder with low melting point to be integral through cutting down material contiguous block 6 with glass shell 1 respectively with stress birfringence mirror 5.After the vertical direction of principal axis of He-Ne two-frequency laser adds suitable magnetic field; Because transverse zeeman effect and " mode pulling "; Each laser longitudinal module will split into two bundle orhtogonal linear polarizaiton laser outputs; The frequency difference of two bunch polarised lights is relevant with residual stress on the stress birfringence mirror, and therefore through the stress of adjustment stress birfringence mirror 5, the frequency difference of two bunch polarisations that can adjust the output of He-Ne two-frequency laser is to ideal value; The frequency difference scope that the present invention adopts the laser engraving method that the He-Ne two-frequency laser is produced is 3～40MHz, and detailed process may further comprise the steps:
1, be provided with one and include He-Ne two-frequency laser, laser engraving machine and system for computer, the outgoing mirror of the resonant cavity of He-Ne two-frequency laser adopts stress birfringence mirror 5.
2, before the laser engraving; The vertical direction of principal axis of He-Ne two-frequency laser is added suitable magnetic field to eliminate mode competition; Through experiment test and indicate the He-Ne two-frequency laser export two the bundle polarised lights the polarization direction; Detailed process is: slightly apply external force on a polarization direction therein, through observing the variation of frequency difference on the oscilloscope, the direction that frequency difference increases when increasing with definite stress; The direction that frequency difference increases when usually increasing stress is one of polarization direction of two polarised lights, and the direction that frequency difference reduces when increasing stress is the polarization direction of another polarised light just.
3, the position between the stress birfringence mirror 5 of adjustment laser engraving machine and He-Ne two-frequency laser; Make the incident light of laser engraving machine vertical with the stress birfringence minute surface; And adjust the direction that laser engraving machine goes out luminous point, make it focus on the position of mid-depth in the stress birfringence mirror.
4, the pattern with required engraving is input in the computer.
5, start laser engraving machine; According to the required frequency difference size of obtaining; The pumping current of control laser engraving machine, and regulate the distance that the fried point of institute's depiction and laser engraving machine center go out luminous point, carve in stress birfringence mirror 5 by the pattern that the computer control laser engraving machine will be made in advance; For example: when needing the He-Ne two-frequency laser to produce the frequency difference of 2MHz～10MHz; The power of selecting laser engraving machine for use is 2W; Pumping current is about 3.5A; Depiction is the hemisphere about diameter 1mm, and the resolution of depiction (distances between adjacent two points of composition pattern) is about 0.01mm.
Like Fig. 2, shown in Figure 3; Among above-mentioned each embodiment; Because highly reflecting films layer 7 is established in the plating of the outside of stress birfringence mirror 5, the diameter of highly reflecting films layer 7 is generally less than the diameter of stress birfringence mirror 5, and the adjustment laser engraving machine goes out the direction of luminous point in the step 3; Avoid the highly reflecting films layer 7 of stress birfringence mirror 5, the distance that laser engraving machine goes out spot distance highly reflecting films layer 7 center of circle is 2～5mm.
Among above-mentioned each embodiment; Use laser engraving machine at stress birfringence mirror 5 inner depiction or figures in the step 4; Can offset the residual stress of stress birfringence mirror 5 or produce new bigger stress; Can be through the fried point of control depiction and the distance that laser engraving machine goes out luminous point, pattern explodes the relevant parameters such as degree of size, volume and the gasification of point, can control the difference on the frequency of He-Ne two-frequency laser accurately.When the frequency difference that produces surpasses predetermined value or during less than predetermined value; Pumping current that can be through reducing laser engraving machine, change method that depiction go out the distance of luminous point apart from the laser engraving machine center or regulate the fried point of pattern and take off stress (reducing stress) or append stress (increase stress) and control, the direction that takes off stress is vertical with the direction of appending stress.
Among above-mentioned each embodiment; Depiction is a some cloud of in stress birfringence mirror 5, being got pattern by laser engraving machine, because the some cloud is the fried point of high-temperature gasification, the internal stress that therefore can change stress birfringence mirror 5 distributes; Thereby make output of He-Ne two-frequency laser and the corresponding frequency difference of internal stress; The shape of pattern or size can be selected and regulate according to actual, do not limit at this, regulate requirement as long as can satisfy stress intensity.
The frequency difference that produces with the He-Ne two-frequency laser below is that 20MHz is that specific embodiment further specifies the process that adopts method of the present invention to produce frequency difference, may further comprise the steps:
1, before the laser engraving, the vertical direction of principal axis of He-Ne two-frequency laser is added the magnetic field about 200 Gausses, when confirming that through testing stress increases, frequency difference is the direction of corresponding increase also.
2, the position between the stress birfringence mirror 5 of adjustment laser engraving machine and He-Ne two-frequency laser; The incident direction that makes laser engraving machine is perpendicular to the stress birfringence minute surface; And it is (as shown in Figure 2 for being about 5mm that the center goes out the distance in spot distance highly reflecting films layer 7 center of circle; The distance in the stain and highly reflecting films layer 7 center of circle is 5mm), and make the laser engraving machine focus be in mid-depth place in the stress birfringence mirror.
3, be 1mm with diameter, resolution is that the half sphere pattern file of 0.1mm is input in the computer.
4, start laser engraving machine, the pumping current of laser engraving machine is adjusted to 3.8A, by the computer control laser engraving machine preparatory half sphere pattern is carved in stress birfringence mirror 5, the output frequency difference that can obtain the He-Ne two-frequency laser is the frequency difference of required generation.
Above-mentioned each embodiment only is used to explain the present invention, and wherein implementation step of method etc. all can change to some extent, and every equivalents of on the basis of technical scheme of the present invention, carrying out and improvement all should not got rid of outside protection scope of the present invention.
Claims (5)
1. a He-Ne two-frequency laser frequency difference produces and assignment method, may further comprise the steps:
1) be provided with one and include He-Ne two-frequency laser, laser engraving machine and system for computer, the outgoing mirror of the resonant cavity of said He-Ne two-frequency laser is the stress birfringence mirror;
2) before the laser engraving, the vertical direction of principal axis of He-Ne two-frequency laser is added magnetic field, test and indicate the polarization direction of He-Ne two-frequency laser output two bundle polarised lights, and definite stress is when increasing, frequency difference is the direction of corresponding increase also;
3) position between adjustment laser engraving machine and the stress birfringence mirror makes the incident light of laser engraving machine vertical with the stress birfringence minute surface, and adjusts the direction that laser engraving machine goes out luminous point, makes it focus on the mid-depth place in the stress birfringence mirror;
4) pattern with required engraving is input in the computer;
5) start said laser engraving machine; According to the required He-Ne two-frequency laser frequency difference size of obtaining; The degree of size, volume and the gasification of the pumping current of control laser engraving machine, the fried point of pattern; And regulate the distance that the fried point of institute's depiction and said laser engraving machine center go out luminous point, said computer control swashs said smooth engraving machine pattern is carved in said stress birfringence mirror.
2. a kind of He-Ne two-frequency laser frequency difference as claimed in claim 1 produces and assignment method; It is characterized in that: the adjustment laser engraving machine goes out the direction of luminous point in the said step 3); Will avoid the highly reflecting films layer of stress birfringence mirror when making it focus on the mid-depth in the stress birfringence mirror, the distance that laser engraving machine goes out the highly reflecting films layer center of circle of spot distance stress birfringence mirror is 2～5mm.
3. a kind of He-Ne two-frequency laser frequency difference as claimed in claim 1 produces and assignment method, it is characterized in that: the shape of pattern or size are confirmed according to required generation frequency difference size in the said step 4).
4. a kind of He-Ne two-frequency laser frequency difference as claimed in claim 2 produces and assignment method, it is characterized in that: the shape of pattern or size are confirmed according to required generation frequency difference size in the said step 4).
5. produce and assignment method like claim 1 or 2 or 3 or 4 described a kind of He-Ne two-frequency laser frequency differences; It is characterized in that: surpass predetermined value or during when the frequency difference that produces in the said step 5) less than predetermined value; Pumping current through reducing laser engraving machine, change method that depiction goes out the distance of luminous point apart from the laser engraving machine center or regulate the fried point of pattern and take off stress or append stress and control, the direction that takes off stress is vertical with the direction of appending stress.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5091913A (en) * | 1990-04-10 | 1992-02-25 | Tsinghua Unversity | Quartz crystal tuning he-ne double frequency laser |
| RU2086059C1 (en) * | 1994-01-19 | 1997-07-27 | Анатолий Васильевич Еньшин | Tuned laser |
| JP2000221556A (en) * | 1999-02-03 | 2000-08-11 | Atr Adaptive Communications Res Lab | Two-optical signal generator |
| CN1773789A (en) * | 2005-11-04 | 2006-05-17 | 清华大学 | Elastic stressing stress birefringence double-frequency laser |
| CN100570967C (en) * | 2008-04-18 | 2009-12-16 | 清华大学 | Birefringence double-frequency laser based on the drilling stress adjusting |
-
2012
- 2012-08-03 CN CN201210275253.0A patent/CN102780154B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5091913A (en) * | 1990-04-10 | 1992-02-25 | Tsinghua Unversity | Quartz crystal tuning he-ne double frequency laser |
| RU2086059C1 (en) * | 1994-01-19 | 1997-07-27 | Анатолий Васильевич Еньшин | Tuned laser |
| JP2000221556A (en) * | 1999-02-03 | 2000-08-11 | Atr Adaptive Communications Res Lab | Two-optical signal generator |
| CN1773789A (en) * | 2005-11-04 | 2006-05-17 | 清华大学 | Elastic stressing stress birefringence double-frequency laser |
| CN100570967C (en) * | 2008-04-18 | 2009-12-16 | 清华大学 | Birefringence double-frequency laser based on the drilling stress adjusting |
Non-Patent Citations (2)
| Title |
|---|
| LIU CUI,ET AL: "optical feedback effects in orthogonally polarized dual frequency he-ne lasr", 《OPTICS COMMUNICATIONS》, no. 275, 31 December 2007 (2007-12-31), pages 201 - 205 * |
| 黄春宁，等: "新型大频差可调谐双频激光器", 《光电子.激光》, vol. 13, no. 3, 31 March 2002 (2002-03-31), pages 230 - 231 * |
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