CN202770409U - High efficiency laser interference light path system - Google Patents
High efficiency laser interference light path system Download PDFInfo
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- CN202770409U CN202770409U CN 201220470815 CN201220470815U CN202770409U CN 202770409 U CN202770409 U CN 202770409U CN 201220470815 CN201220470815 CN 201220470815 CN 201220470815 U CN201220470815 U CN 201220470815U CN 202770409 U CN202770409 U CN 202770409U
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Abstract
The utility model provides a high efficiency laser interference light path system. Linearly polarized light generated by a narrow linewidth linear polarized laser is divided into measuring light and reference light after passing through a polarized light splitting prism I, the measuring light becomes circularly polarized light after passing through a 1/4 wave plate I, the circularly polarized light is reflected back by a reflection plane I, the reflected circularly polarized light becomes linearly polarized light I after passing through the 1/4 wave plate I a second time, the reference light becomes circularly polarized light after passing through a 1/4 wave plate II, the circularly polarized light is reflected back by a reflection plane II, the reflected circularly polarized light becomes linearly polarized light II after passing through the 1/4 wave plate II a second time, the linearly polarized light I and the linearly polarized light II are integrated into one beam of linearly polarized light III at the polarized light splitting prism I, the linearly polarized light III is perpendicular to the linearly polarized light I and the linearly polarized light II, the linearly polarized light III is divided into linearly polarized light IV and linearly polarized light V after passing through a polarized light splitting prism II, the linearly polarized light IV becomes linearly polarized light VI after passing through a 1/2 wave plate, the linearly polarized light VI and the linearly polarized light V have a same vibration direction, and the linearly polarized light VI and the linearly polarized light V are mixed to form one beam to generate interference.
Description
Technical field
The utility model relates to and belongs to the laser interferometry field, is specifically related to a kind of high-level efficiency laser interference light path system based on Doppler effect.
Background technology
Up to the present, the laser interferometry technology based on Doppler effect is the measuring technique of the highest displacement of precision, speed, acceleration.This measuring technique is to utilize the two-beam principle of interference to measure, and its measurement unit is optical wavelength, therefore can reach very high precision.In addition, laser measurement is non-cpntact measurement, can not destroy the primary characteristic of testee, is a kind of measurement with biological protection characteristic.But the laser that power density is larger is influential to life entity, for fear of the injury that this high power brings, improves the utilization ratio of interference light as far as possible, is a kind of feasible effective method thereby reduce laser power.
In existing optical interference circuit system, because light source does not have the characteristic of narrow linewidth and linear polarization, in the process of measuring light and reference light light splitting, reciprocal characteristics according to light, light utilization efficiency will lose the luminous power of half at least, therefore for reaching a good interference effect, certainly will to make laser power reach certain performance number.In addition, owing to not adopting linearly polarized light and polarization optical element, so that the measurement light when interfering no longer is single reference reflecting surface and the reflected light of measurement reflecting surface with reference light, therefore interference light intensity changes the interferometry characteristic that does not have maximum, is unfavorable for guaranteeing improving laser power under the enough prerequisites of interference light signal intensity.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of high-level efficiency laser interference light path system.
In order to solve the problems of the technologies described above, the technical solution of the utility model is:
A kind of high-level efficiency laser interference light path system, the linearly polarized light that narrow linewidth linearly polarized laser device produces is divided into after the polarization splitting prism I measures light and reference light, measurement light is reflected by the reflecting surface I through formation circularly polarized light after the quarter wave plate I and again form the linearly polarized light I after the quarter wave plate I, reference light is reflected by the reflecting surface II through formation circularly polarized light after the quarter wave plate II and again form the linearly polarized light II after the quarter wave plate II, the linearly polarized light I is closed on the polarization splitting prism I with the linearly polarized light II and is restrainted into a branch of two orthogonal linearly polarized light III, the linearly polarized light III is divided into linearly polarized light IV and linearly polarized light V after the polarization splitting prism II, the linearly polarized light IV becomes the linearly polarized light VI identical with linearly polarized light V direction of vibration through 1/2 wave plate, and the linearly polarized light VI is joined mutually to restraint to produce with the linearly polarized light V and interfered.
Above-mentioned high-level efficiency laser interference light path system, described linearly polarized light VI are parallel with the linearly polarized light V and inject symmetrically convex lens and assemble to intersect to produce and interfere through 90 ° of reflecting surface II break-ins.
Above-mentioned high-level efficiency laser interference light path system, described linearly polarized light V are parallel with the linearly polarized light VI and inject symmetrically convex lens and assemble to intersect to produce and interfere through 90 ° of reflecting surface II break-ins.
Above-mentioned high-level efficiency laser interference light path system, the light intensity variable signal of described interference is caught by photodetector.
Above-mentioned high-level efficiency laser interference light path system, described reflecting surface I is level crossing, reflecting prism or medal polish face, described reflecting surface II is level crossing, reflecting prism or medal polish face.
Above-mentioned high-level efficiency laser interference light path system, the direction of vibration of described linearly polarized light VI and linearly polarized light V is all identical with frequency.
Measure light and reference light and be linearly polarized light, and the polarization direction is mutually vertical, therefore can independently propagate, not only be conducive to improve the degree of isolation of light but also be conducive to improve light utilization efficiency.Improve the utilization ratio of interference light, can obtain stronger interferometry signal, reduce laser power, can avoid larger laser power density to the injury that life entity brings, play a protective role.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:
Fig. 1 is fundamental diagram of the present utility model.
Among the figure: 1 linearly polarized laser device, 2 polarization splitting prisms, 3 catoptron II, 4 quarter wave plate II, 5 quarter wave plate I, 6 catoptron I, 7 polarization splitting prism II, 8 convex lens, 9 photodetectors, 10 1/2 wave plates, 11 catoptrons.
Embodiment
As shown in Figure 1, a kind of high-level efficiency laser interference light path system, its principle of work is as follows: the linearly polarized light that narrow linewidth linearly polarized laser device 1 produces is divided into after polarization splitting prism I 2 measures light and reference light, and the direction of propagation of measuring light and reference light is vertical.Measurement light is reflected by reflecting surface I 6 through formation circularly polarized light after the quarter wave plate I 5 and again form the linearly polarized light I after quarter wave plate I 5, reference light is reflected by reflecting surface II 3 through formation circularly polarized light after the quarter wave plate II 4 and again form the linearly polarized light II after quarter wave plate II 4, the linearly polarized light I is closed on polarization splitting prism I 2 with the linearly polarized light II and is restrainted into a branch of two orthogonal linearly polarized light III, the linearly polarized light III is divided into linearly polarized light IV and linearly polarized light V after polarization splitting prism II 7, the linearly polarized light IV becomes the linearly polarized light VI identical with linearly polarized light V direction of vibration through 1/2 wave plate 10, and the linearly polarized light VI is joined mutually to restraint to produce with the linearly polarized light V and interfered.
In above-mentioned, linearly polarized light I and linearly polarized light II are closed bundle on polarization splitting prism I 2, are in order to play the effect of light path isolation.
Those skilled in the art as can be known, the mode of linearly polarized light VI and linearly polarized light V intersection interference is a lot, any device that they can be closed bundle all can, now enumerate following dual mode:
First kind of way: described linearly polarized light VI is parallel with the linearly polarized light V and inject symmetrically convex lens and assemble to intersect to produce and interfere through 90 ° of reflecting surface II break-ins.
The second way: described linearly polarized light V and linearly polarized light VI produce through the optical fibre device coupling interferes.
The light intensity variable signal of above-mentioned interference is caught by photodetector 9, the typical metering system of interference light can be by photodetector 9 Direct Acquisition interference light intensity variable signals, thereby utilize Doppler effect signal to be processed the measurement that realizes displacement, speed, acceleration.
Particularly, described reflecting surface I is level crossing, reflecting prism or medal polish face, and described reflecting surface II is level crossing, reflecting prism or medal polish face.The selection of reflecting surface should be able to guarantee that larger variation does not occur the light signal polarization characteristic.
The polarized light VI produces the condition of interfering with the linearly polarized light V: the direction of vibration of described linearly polarized light VI and linearly polarized light V is all identical with frequency.
Claims (6)
1. high-level efficiency laser interference light path system, it is characterized in that: the linearly polarized light that narrow linewidth linearly polarized laser device produces is divided into after the polarization splitting prism I measures light and reference light, measurement light is reflected by the reflecting surface I through formation circularly polarized light after the quarter wave plate I and again form the linearly polarized light I after the quarter wave plate I, reference light is reflected by the reflecting surface II through formation circularly polarized light after the quarter wave plate II and again form the linearly polarized light II after the quarter wave plate II, the linearly polarized light I is closed on the polarization splitting prism I with the linearly polarized light II and is restrainted into a branch of two orthogonal linearly polarized light III, the linearly polarized light III is divided into linearly polarized light IV and linearly polarized light V after the polarization splitting prism II, the linearly polarized light IV becomes the linearly polarized light VI identical with linearly polarized light V direction of vibration through 1/2 wave plate, and the linearly polarized light VI is joined mutually to restraint to produce with the linearly polarized light V and interfered.
2. high-level efficiency laser interference light path according to claim 1 system is characterized in that: described linearly polarized light VI is parallel with the linearly polarized light V and inject symmetrically convex lens and assemble to intersect to produce and interfere through 90 ° of reflecting surface II break-ins.
3. high-level efficiency laser interference light path according to claim 1 system is characterized in that: described linearly polarized light V is parallel with the linearly polarized light VI and inject symmetrically convex lens and assemble to intersect to produce and interfere through 90 ° of reflecting surface II break-ins.
4. according to claim 2 or 3 described high-level efficiency laser interference light path systems, it is characterized in that: the light intensity variable signal of described interference is caught by photodetector.
5. according to claim 2 or 3 described high-level efficiency laser interference light path systems, it is characterized in that: described reflecting surface I is level crossing, reflecting prism or medal polish face, and described reflecting surface II is level crossing, reflecting prism or medal polish face.
6. according to claim 1,2 or 3 described high-level efficiency laser interference light path systems, it is characterized in that: the direction of vibration of described linearly polarized light VI and linearly polarized light V is all identical with frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470815 CN202770409U (en) | 2012-09-17 | 2012-09-17 | High efficiency laser interference light path system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470815 CN202770409U (en) | 2012-09-17 | 2012-09-17 | High efficiency laser interference light path system |
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| CN202770409U true CN202770409U (en) | 2013-03-06 |
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| CN 201220470815 Expired - Fee Related CN202770409U (en) | 2012-09-17 | 2012-09-17 | High efficiency laser interference light path system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785779A (en) * | 2015-03-20 | 2015-07-22 | 南京奕宇光电科技有限公司 | Laser scanning head, three-dimensional printing device and printing method |
| CN106290299A (en) * | 2016-08-04 | 2017-01-04 | 北京华泰诺安探测技术有限公司 | A kind of polarization diversity polarization Raman probe and optical spectrum detecting method |
| CN109709685A (en) * | 2019-03-14 | 2019-05-03 | 曲阜师范大学 | A kind of non-polarized Raman laser turns the device of linearly polarized laser |
| CN113959358A (en) * | 2021-10-27 | 2022-01-21 | 中国计量科学研究院 | Four-quadrant interferometric measurement system based on integrated array wave plate |
-
2012
- 2012-09-17 CN CN 201220470815 patent/CN202770409U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785779A (en) * | 2015-03-20 | 2015-07-22 | 南京奕宇光电科技有限公司 | Laser scanning head, three-dimensional printing device and printing method |
| CN106290299A (en) * | 2016-08-04 | 2017-01-04 | 北京华泰诺安探测技术有限公司 | A kind of polarization diversity polarization Raman probe and optical spectrum detecting method |
| CN109709685A (en) * | 2019-03-14 | 2019-05-03 | 曲阜师范大学 | A kind of non-polarized Raman laser turns the device of linearly polarized laser |
| CN113959358A (en) * | 2021-10-27 | 2022-01-21 | 中国计量科学研究院 | Four-quadrant interferometric measurement system based on integrated array wave plate |
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Legal Events
| 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 |
Granted publication date: 20130306 Termination date: 20150917 |
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| EXPY | Termination of patent right or utility model |