CN1182635C - Dual-frequency laser device with dual refractive films - Google Patents
Dual-frequency laser device with dual refractive films Download PDFInfo
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- CN1182635C CN1182635C CNB021207984A CN02120798A CN1182635C CN 1182635 C CN1182635 C CN 1182635C CN B021207984 A CNB021207984 A CN B021207984A CN 02120798 A CN02120798 A CN 02120798A CN 1182635 C CN1182635 C CN 1182635C
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- birefringent
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Abstract
The present invention relates to a dual-frequency laser device with dual refractive films, which belongs to the field of He-Ne lasers. The laser of the present invention is composed of a He-Ne laser discharge tube, a laser window sheet, a cavity mirror and a pair of permanent magnets. The present invention is characterized in that a base sheet is coated with an overlapping-layer type film structure containing dual refractive films. The dual refractive film is an anisotropic film which has the dual refractive character and has different refractivity to light of different states of polarization; when entering the dual refractive film, the light is changed into polarized light vibrating in two mutually perpendicular directions, and the transmission speed is different. The dual-frequency laser device with dual refractive films of the present invention has the advantages of simple structure of the inner part of a cavity, simple manufacturing technologies of a cavity mirror and the window sheet and easy operation of the manufacturing technologies.
Description
Technical field
A kind of dual-frequency laser device with dual refractive films belongs to the helium neon laser field, mainly is used as the light source of two-frequency laser interferometer and laser vibration measurer.
Background technology
Existing several HeNe two-frequency lasers: Zeemen effect birefringence double-frequency laser, crystalline quartz birefringence double-frequency laser and stress birefringence double-frequency laser.The double-frequency zeeman laser device is to add external magnetic field by Zeemen effect and the common effect of laser die pulling effect on helium neon laser, and makes laser form two frequencies, determines the difference of two frequencies to be not more than 3MHz by physical principle.Crystalline quartz or stress birefringence double-frequency laser are to cause two frequencies by the birefringence element in laser cavity.Owing to the latch-up phenomenon that the mode competition effect causes (latch-up phenomenon is a frequency difference during less than 40MHz, and a frequency is extinguished) is arranged, proposes two kinds of methods again.A kind of is to use horizontal external magnetic field simultaneously and put into birefringence element (photoelastic effect birefringence element or crystalline quartz birefringence element) outside the HeNe laser in laser, make birefringence double-frequency laser eliminate the frequency difference latch-up phenomenon, make birefringence double-frequency laser both can export the above frequency difference of 40MHz, also can export from approaching zero hertz little frequency difference to the frequency difference and tens of several megahertzes, tens megahertzes, the large frequency-difference of megahertzes up to a hundred.But this method element in laser cavity is more, complex structure.Another kind is when using magnetic field, utilizes " polarizing double reflecting film speculum " to make the following frequency difference of HeNe laser output 40MHz.The manufacture craft more complicated of this method.
Summary of the invention
It is simple that the purpose of invention provides a kind of laser cavity inner structure, and processing technology is than the two-frequency laser of simple possible.
Dual-frequency laser device with dual refractive films of the present invention is by the He-Ne Lasers discharge tube, the laser window, and the chamber mirror, pair of permanent magnets is formed, and it is characterized in that containing in laser inside the LAM type film structure of anti-reflection film, birefringent film, reflectance coating.LAM type film structure of the present invention is at the layered structure that once is coated with anti-reflection film, birefringent film, reflectance coating on the substrate of laser chamber mirror or is coated with the layered structure of anti-reflection film, birefringent film on the substrate of laser window.
The said birefringent film of the present invention is a kind of anisotropic deielectric-coating with birefringent characteristic, has different refractive indexes for the light of different polarization states.When light enters birefringent film, become the polarised light of two orthogonal directions vibrations, its transmission speed difference.Constituted the resonant cavity of laser between the reflectance coating of two chamber mirrors of laser.Birefringent film can be plated on the window of speculum or laser tube, is positioned within the laserresonator.
The present invention is said, and to be coated with the speculum of layered structure of anti-reflection film, birefringent film, total reflection or partial reflection film different with said polarizing double reflecting film speculum on the document that has.The polarizing double reflecting film speculum is meant " laminated reflective film of particular process fabrication ", " being to form by means of the overstrain on the rete ", " at first sheet glass is applied external force, plate highly reflecting films then, remove external force again, form residual stress ".This mirror polarization double reflecting film is that reflection and birefringence are realized in a film system simultaneously.Structure of the present invention then is a LAM type: function of reflecting is finished by reflectance coating, and the birefringence function is finished by birefringent film, and anti-reflection film is in order to protect birefringent film and to reduce birefringent film to reflection of light.LAM type structural advantages of the present invention is can be to rete reflection characteristic, birefringent characteristic respectively being coated with middle control, easy to implement.
In the present invention, the frequency difference of the generation of two frequencies and two frequencies is determined by birefringent film, and the effect in magnetic field is to eliminate laser two frequency intervals strong mode competition hour each other, makes two all stable oscillation stationary vibrations of frequency, and laser becomes the two-frequency laser of no frequency difference locking.
Description of drawings
Fig. 1 is the full inner-cavity structure schematic diagram of dual-frequency laser device with dual refractive films of the present invention.
Fig. 2 is the first kind of structural representation that has the laser mirror of birefringent film.
Fig. 3 is the second kind of structural representation that has the laser mirror of birefringent film.
Fig. 4 is the structural representation that has the laser window of birefringent film.
Among Fig. 1, the 1st, the He-Ne Lasers discharge tube.2 is speculums, the 5th, and another speculum is formed laserresonator.3, the 4th, magnetic direction in the middle of a pair of bar permanent magnet, two magnet and 1 axis normal.In Fig. 1, as 2 being completely reflecting mirrors, then 5 being partially reflecting mirror (laser output mirrors), as 2 being partially reflecting mirrors (laser output mirror), then 5 being completely reflecting mirrors.Have birefringent film in one the rete in 2 and 5 these two speculums.
Embodiment one Fig. 2 is the first kind of structure that has the laser mirror of birefringent film.The 20th, mirror substrate, the 6th, total reflection film or partial reflection film, the 7th, anti-reflection film, the 8th, birefringent film.In fact, 6,7,8 only have several micron thickness, for clarity, have amplified a lot among the figure.20 left surface is encapsulated on the He-Ne Lasers discharge tube mouth of pipe.
Embodiment two Fig. 3 are the second kind of structures that has the laser mirror of birefringent film.The 20th, mirror substrate, the 6th, total reflection (or part) reflectance coating, the 8th, birefringent film, the 7th, anti-reflection film.20 left surface is encapsulated on the mouth of pipe.
Embodiment three Fig. 4 are the structures that have the laser window of birefringent film, are used for half intracavity laser.The 20th, the substrate of window, the 8th, birefringent film, the 7th, anti-reflection film.
Claims (3)
1. one kind by the He-Ne Lasers discharge tube, the laser window, the chamber mirror, the dual-frequency laser device with dual refractive films that the pair of permanent magnets piece is formed, it is characterized in that containing in laser inside the LAM type film structure of anti-reflection film, birefringent film, reflectance coating, said birefringent film is a kind of anisotropic film with birefringent characteristic, has different refractive indexes for the light of different polarization states, when entering birefringent film, light becomes the polarised light of two orthogonal directions vibrations, its transmission speed difference.
2. according to the said birefringence double-frequency laser of claim 1, it is characterized in that said LAM type film system is coated with in two laser mirrors one from being the LAM type structure of anti-reflection film, birefringent film, highly reflecting films in turn to glass substrate outward.
3. according to the said birefringence double-frequency laser of claim 1, it is characterized in that said LAM type film system is that on two surfaces of laser tube window one is coated with anti-reflection film, birefringent film, and another surface is coated with the structure of anti-reflection film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021207984A CN1182635C (en) | 2002-05-31 | 2002-05-31 | Dual-frequency laser device with dual refractive films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021207984A CN1182635C (en) | 2002-05-31 | 2002-05-31 | Dual-frequency laser device with dual refractive films |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1379514A CN1379514A (en) | 2002-11-13 |
| CN1182635C true CN1182635C (en) | 2004-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021207984A Expired - Fee Related CN1182635C (en) | 2002-05-31 | 2002-05-31 | Dual-frequency laser device with dual refractive films |
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| CN (1) | CN1182635C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333258C (en) * | 2004-06-25 | 2007-08-22 | 清华大学 | Self-mixed intervention Doppler velometer based on two-frequency laser |
| CN108029673A (en) * | 2017-12-22 | 2018-05-15 | 武汉多谱多勒科技有限公司 | A kind of laser bird expelling equipment |
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2002
- 2002-05-31 CN CNB021207984A patent/CN1182635C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1379514A (en) | 2002-11-13 |
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Granted publication date: 20041229 Termination date: 20100531 |