CN2053386U - He-ne dual-frequency laser with quartz crystal tuning - Google Patents
He-ne dual-frequency laser with quartz crystal tuning Download PDFInfo
- Publication number
- CN2053386U CN2053386U CN 88221515 CN88221515U CN2053386U CN 2053386 U CN2053386 U CN 2053386U CN 88221515 CN88221515 CN 88221515 CN 88221515 U CN88221515 U CN 88221515U CN 2053386 U CN2053386 U CN 2053386U
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- China
- Prior art keywords
- laser
- frequency
- crystal
- frequency laser
- utility
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000010453 quartz Substances 0.000 title claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000013078 crystal Substances 0.000 title abstract description 10
- 238000007747 plating Methods 0.000 claims description 2
- 230000010287 polarization Effects 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
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- Lasers (AREA)
Abstract
The utility model relates to a He-Ne dual frequency laser with quartz crystal tuning, which belongs to the field of laser technique and devices. The utility model is characterized in that a crystal quartz sheet with two flat surfaces plated with anti-reflection films is arranged in a He-Ne laser cavity resonator. The crystal quartz sheet outputs a laser with two orthogonal polarization and different frequencies. The frequency difference is determined by an angle formed by a crystal shaft of the crystal quartz sheet and the direction of the laser. The upper limit can reach hundreds of MHz. The crystal quartz sheet can be used as a plane mirror of the laser when frequency stabilization is not needed. The inward surface is plated with the anti-reflection film, and the outward surface is provided with a laser reflecting film. The laser can be used as a light source of a dual frequency laser interferometer and can also be used for application occasions, such as Doppler speedometers.
Description
The utility model belongs to laser technology and device.
The He--Ne two-frequency laser that present two-frequency laser interferometer uses is to be made of He--Ne laser tube and the magnet that adds thereon.Because this two-frequency laser output is a branch of two kinds of circularly polarized lights that frequency is different that contain, and therefore in use needs to be converted to by optical element the linearly polarized light of pairwise orthogonal again, could obtain beat frequency.The frequency difference of two of this laser kinds of circularly polarized lights has only several megahertzes in addition.
The utility model is intended to make a kind of novel He--Ne two-frequency laser, makes its orhtogonal linear polarizaiton light that can produce two kinds of different frequencies, and its frequency difference upper limit can also can be given setting or tuning within the specific limits earlier to hundreds of megahertzes greatly as required.Therefore use the laser interferometer of this laser, simple in structure.This laser also can be used for testing the speed etc. such as dobla needs the occasion of large frequency-difference.
The utility model is characterized in that inserting the crystalline quartz sheet that one two logical light face all is coated with anti-reflection film in the He--Ne laser chamber, and this crystalline quartz sheet is placed as crystallographic axis and the laser beam direction is angled.
The principle that this laser produces two frequency laser is as follows:
Crystalline quartz sheet ［ 3 ］ is a birefringence element, and it has the principal direction of two quadratures.Run in the laserresonator, the light beam that the polarization direction is parallel to these two principal directions has different refractive indexes when passing ［ 3 ］.Though these two kinds of light move in same how much resonant cavitys, and different optical path lengths is arranged.By the laser condition of resonance, these two kinds of light will have different wavelength and frequency.When the crystallographic axis ［ C ］ of crystalline quartz ［ 3 ］ is parallel with beam direction, two kinds of degeneracys only, no frequency splitting takes place, and laser has only a frequency output.When the crystallographic axis ［ C ］ of crystalline quartz ［ 3 ］ and a beam direction angle of folder ［ α ］, laser is then exported the light (double-frequency laser) of two kinds of frequencies.［ α ］ big more two kinds of light frequency differences are also big more.
Brief Description Of Drawings:
Fig. 1 is one of the utility model example structure
Fig. 2 is two of the utility model example structure
Fig. 3 is three of the utility model example structure
Wherein ［ 1 ］ laser tube ［ 2 ］ plane reflection diaphragm ［ 3 ］ concave surface flat fire mirror ［ 4 ］ window ［ 5 ］ quartz wafer ［ 6 ］ rotates fixed mechanism ［ 7 ］ piezoelectric ceramic ［ 8 ］ quartz crystal window ［ 9 ］ quartz crystal diaphragm
The structure of one of the utility model embodiment as shown in Figure 1, by laser tube ［ 1 ］, plane mirror ［ 2 ］, window ［ 4 ］, insert the quartz wafer ［ 5 ］ that the two sides is coated with anti-reflection film in the half exocoel He--Ne laser that concave mirror ［ 3 ］ constitutes, this wafer is fixed on the rotatable fixed mechanism ［ 6 ］, fixes its position again after the crystallographic axis ［ C ］ that makes quartz wafer and the angle ［ α ］ of laser beam Cheng Yuding.Concave output mirror ［ 3 ］ external pasting one piezoelectric ceramic ［ 7 ］ makes output frequency stable.This design feature is that the position of quartz wafer is adjustable, can obtain different frequency difference amounts.
The more practical embodiment of the utility model as shown in Figure 2, its characteristics be the window of half inner chamber He--Ne laser use instead quartz wafer ［ 8 ］ be affixed on the discharge mouth of pipe on, its angle ［ α ］ can frequency difference be as required given earlier and being provided, in the present embodiment if the distance of getting speculum ［ 2 ］ and ［ 3 ］ is 180mm, ［ α ］=5 ° obtain frequency difference and then are 130MHZ, and this design feature is economized out a window, reduce loss, and simple and stable structure.
The utility model also can adopt full inner-cavity structure, as shown in Figure 3.The plane mirror that it is characterized in that the He--Ne laser adopts quartz wafer ［ 9 ］, to inner face plating anti-reflection film, plate reflectance coating to the outside in these quartz wafer two logical light faces, the two sides normal direction becomes ［ α ］ angle with its crystallographic axis, this structure is compact more, makes its miniaturization.
Claims (4)
1, a kind of He--Ne two-frequency laser, comprise the half inner chamber He--Ne laser that laser tube, speculum, window are formed, it is characterized in that in said laser chamber, inserting a slice quartz wafer, two transparent surfaces of this quartz wafer all are coated with anti-reflection film, this wafer be placed as its crystallographic axis and beam direction angled.
2, He--Ne two-frequency laser as claimed in claim 1 it is characterized in that said quartz wafer inserts between window ［ 4 ］ and the concave mirror ［ 3 ］, but this wafer is fixed on the placement mechanism ［ 6 ］.
3, He--Ne two-frequency laser as claimed in claim 1 is characterized in that said quartz wafer is the window ［ 8 ］ of discharge tube, is affixed on the discharge mouth of pipe.
4, He--Ne two-frequency laser as claimed in claim 1 is characterized in that said quartz wafer is affixed on the discharge mouth of pipe for the plane mirror of this laser, and it plates speculum to the outside, to inner face plating anti-reflection film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88221515 CN2053386U (en) | 1988-12-31 | 1988-12-31 | He-ne dual-frequency laser with quartz crystal tuning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88221515 CN2053386U (en) | 1988-12-31 | 1988-12-31 | He-ne dual-frequency laser with quartz crystal tuning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2053386U true CN2053386U (en) | 1990-02-21 |
Family
ID=4853525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88221515 Expired - Lifetime CN2053386U (en) | 1988-12-31 | 1988-12-31 | He-ne dual-frequency laser with quartz crystal tuning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2053386U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1091317C (en) * | 1999-11-19 | 2002-09-18 | 清华大学 | Polarizing double reflecting film two-frequency laser |
| CN1299407C (en) * | 2004-10-22 | 2007-02-07 | 清华大学 | Cat's eye chamber helium neon laser |
| CN101943772A (en) * | 2010-08-26 | 2011-01-12 | 华中科技大学 | Tunable optical comb filter combining G-T resonant cavity and birefringence element |
| CN102403648A (en) * | 2011-12-02 | 2012-04-04 | 中国计量科学研究院 | Frequency stabilization He-Ne laser structure |
-
1988
- 1988-12-31 CN CN 88221515 patent/CN2053386U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1091317C (en) * | 1999-11-19 | 2002-09-18 | 清华大学 | Polarizing double reflecting film two-frequency laser |
| CN1299407C (en) * | 2004-10-22 | 2007-02-07 | 清华大学 | Cat's eye chamber helium neon laser |
| CN101943772A (en) * | 2010-08-26 | 2011-01-12 | 华中科技大学 | Tunable optical comb filter combining G-T resonant cavity and birefringence element |
| CN102403648A (en) * | 2011-12-02 | 2012-04-04 | 中国计量科学研究院 | Frequency stabilization He-Ne laser structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |