CN101345390A - Ultraviolet frequency double laser - Google Patents
Ultraviolet frequency double laser Download PDFInfo
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- CN101345390A CN101345390A CNA2008100713408A CN200810071340A CN101345390A CN 101345390 A CN101345390 A CN 101345390A CN A2008100713408 A CNA2008100713408 A CN A2008100713408A CN 200810071340 A CN200810071340 A CN 200810071340A CN 101345390 A CN101345390 A CN 101345390A
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Abstract
The invention relates to an ultraviolet frequency-doubling laser comprising a semiconductor laser, an optical coupling system and a laser cavity. The laser cavity includes a laser gain medium, a frequency-doubling crystal and an ultraviolet frequency-doubling crystal, wherein a transparent Walk-off crystal for ultraviolet changes the polarization direction of the frequency-doubling light and isolates the optical component such as laser gain medium which is easy to damage by ultraviolet in one end of the transparent Walk-off crystal for ultraviolet, thereby preventing the whole laser from ultraviolet damage and achieving frequency-doubling in the ultraviolet cavity.
Description
Technical field
The present invention relates to laser field, relate in particular to the ultraviolet frequency double laser of higher-wattage ultraviolet intracavity frequency doubling.
Background technology
In semiconductor pump laser, the intracavity frequency doubling of visible light can obtain extensive use, but intracavity frequency doubling produces ultraviolet band light seldom.Usually adopt V-type refrative cavity structure, enter the opaque gain medium of ultraviolet to avoid ultraviolet light.The patent No. is " laser of quadruple device " patent of 200520073932.5, proposed to utilize the polarization characteristic of frequency doubled light, adopt the ultraviolet devating prism, prevent the optical element that ultraviolet light damage gain medium, frequency-doubling crystal etc. are easily damaged by ultraviolet light, to form the laser of intracavity frequency doubling ultraviolet light output.
Summary of the invention
The object of the invention provides a kind of simple in structure, the ultraviolet frequency double laser of stable performance.
The present invention adopts following structure: ultraviolet frequency double laser comprises semiconductor laser, optical coupling system and laser cavity, laser cavity comprises gain medium, frequency-doubling crystal and ultraviolet frequency double crystal, the Walk-off crystal of UV transparent wherein is set at gain medium and ultraviolet frequency double crystal, the Walk-off crystal of UV transparent is higher than other optical element in the laser cavity, gain medium one end of laser cavity is coated with the ante-chamber film, it is to first-harmonic λ, frequency doubled light λ/2 are high anti-, the ultraviolet frequency double crystal other end of laser cavity is coated with the back cavity film, it is to first-harmonic λ, frequency doubled light λ/2 are high anti-, simultaneously to ultraviolet λ/4 transmissions, the Walk-off crystal of UV transparent exceeds other optical element, the face of back cavity film is coated with the chamber film relatively, and it is to λ/4, λ/2, λ/3 or λ/5 frequency doubled lights are high anti-.
Above-mentioned ultraviolet frequency double crystal is frequency tripling, quadruple, five frequency-doubling crystals.
Above-mentioned frequency-doubling crystal or frequency tripling, quadruple, five frequency-doubling crystals are Type I or Type II frequency-doubling crystal.
Above-mentioned frequency-doubling crystal is arranged between gain medium and the ultraviolet frequency double crystal, and the Walk-off crystal front and back position that is located at UV transparent is not limit.
When above-mentioned ultraviolet frequency double crystal is Type II type ultraviolet frequency double crystal, at the Walk-off of UV transparent crystal output wave plate is set, it is 1/2 wave plate, is full-wave plate to first-harmonic λ ultraviolet light λ/4, perhaps at the Walk-off of UV transparent crystal input wave plate is set, it is 1/2 wave plate, is full-wave plate to first-harmonic λ two frequency doubled light λ/2.
The output of above-mentioned laser cavity is provided with planoconvex spotlight.
The present invention adopts above structure; utilize the Walk-off crystal and the wave plate of UV transparent to change the frequency doubled light polarization direction; the optical element of ultraviolet light damage such as Walk-off crystal one end that gain medium is isolated in UV transparent will be subject to; thereby protect whole laser to avoid it and produce the ultraviolet light damage, realize the ultraviolet intracavity frequency doubling.
Description of drawings
Now in conjunction with the accompanying drawings the present invention is further elaborated:
Fig. 1 is the structural representation of ultraviolet frequency double laser of the present invention;
Fig. 2 is the structural representation of one of laser cavity of the present invention;
Fig. 3 is two a structural representation of laser cavity of the present invention;
Fig. 4 is three a structural representation of laser cavity of the present invention;
Fig. 5 is four a structural representation of laser cavity of the present invention.
Concrete aforesaid way
See also Fig. 1, shown in 2 or 3, the present invention includes semiconductor laser 1, optical coupling system 2 and laser cavity 3, laser cavity 3 comprises gain medium 31, frequency-doubling crystal 32 and ultraviolet frequency double crystal 34, ultraviolet frequency double crystal 34 is a frequency tripling, quadruple, five frequency-doubling crystals, the Walk-off crystal 33 of UV transparent wherein is set between gain medium 31 and ultraviolet frequency double crystal 34, the Walk-off crystal 33 of UV transparent is higher than other optical element in the laser cavity 3, gain medium 31 1 ends of laser cavity 3 are coated with ante-chamber film S1, it is to first-harmonic λ, frequency doubled light λ/2 are high anti-, ultraviolet frequency double crystal 34 other ends of laser cavity are coated with back cavity film S2, it is to first-harmonic λ, frequency doubled light λ/2 are high anti-, simultaneously to ultraviolet light λ/4 transmissions, the Walk-off crystal 33 of UV transparent exceeds other optical element, the face of back cavity film S2 is coated with chamber film S3 relatively, and it is to λ/4, λ/3 or λ/5 are high anti-.Frequency-doubling crystal 32 or frequency tripling, quadruple, five frequency-doubling crystals can adopt Type I or Type II frequency-doubling crystal, are arranged between gain medium 31 and the ultraviolet frequency double crystal 34, and Walk-off crystal 33 front and back positions that are located at UV transparent are not limit.Can also be provided with planoconvex spotlight 4 at the output of laser cavity 3, be applicable to the long intracavity frequency doubling in longer chamber under the higher-power state.
Said structure produces frequency doubled light vibration back and forth between ante-chamber film S1 and back cavity film S2 by Type I frequency-doubling crystal 32, produce frequency tripling, quadruple or five frequency doubled lights of ultraviolet frequency double by ultraviolet frequency double crystal 34, and the relative Walk-off crystal of frequency tripling, quadruple or five frequency doubled lights is an e light, reverse frequency tripling, quadruple or five frequency multiplication ultraviolet lights that ultraviolet frequency double crystal 34 produces reflect from chamber film S3 transmission or through S3 by walk-off, again from the S2 outgoing, because ultraviolet light no longer by gain medium, then avoids ultraviolet light that laser system is damaged.
See also shown in Fig. 4 or 5 again, when ultraviolet frequency double crystal 34 is Type II type ultraviolet frequency double crystal, at the Walk-off of UV transparent crystal 33 outputs wave plate 8 is set, it is 1/2 wave plate, is full-wave plate to first-harmonic λ ultraviolet λ/4; Perhaps at the Walk-off of UV transparent crystal input wave plate 9 is set, it is 1/2 wave plate, is full-wave plate to first-harmonic λ frequency doubled light λ/2. Wave plate 8 or 9 effect are rotation ultraviolet light polarization directions, make ultraviolet light be the e polarization state, do not enter gain medium 31, frequency-doubling crystal 32.
Each element can be the one-tenth separate type resonant cavity that separates in the above-mentioned laser cavity, also can compose micro-piece type laser cavity.
Can add other optical element in the above-mentioned laser cavity, be subject to ultraviolet light and damage Walk-off crystal one end that the optical element frequency multiplication is isolated in UV transparent, be not subject to the Walk-off crystal other end that ultraviolet light damage optical element frequency multiplication is arranged on UV transparent.
Claims (7)
1, a kind of ultraviolet frequency double laser, comprise semiconductor laser, optical coupling system and laser cavity, laser cavity comprises gain medium, frequency-doubling crystal or frequency tripling, quadruple, five frequency-doubling crystals and ultraviolet frequency double crystal, it is characterized in that: the Walk-off crystal that UV transparent is set at gain medium and ultraviolet frequency double crystal, the Walk-off crystal of UV transparent is higher than other optical element in the laser cavity, gain medium one end of laser cavity is coated with the ante-chamber film, it is to first-harmonic λ, frequency doubled light λ/2 are high anti-, the ultraviolet frequency double crystal other end of laser cavity is coated with the back cavity film, it is to first-harmonic λ, frequency doubled light λ/2 are high anti-, simultaneously to ultraviolet λ/4 transmissions, the Walk-off crystal of UV transparent exceeds other optical element, the face of back cavity film is coated with the chamber film relatively, and it is to λ/4, λ/2, λ/3 or λ/5 frequency doubled lights are high anti-.
2, a kind of ultraviolet frequency double laser according to claim 1 is characterized in that: its ultraviolet frequency double crystal is frequency tripling, quadruple, five frequency-doubling crystals.
3, a kind of ultraviolet frequency double laser according to claim 1 and 2 is characterized in that: its frequency-doubling crystal or frequency tripling, quadruple, five frequency-doubling crystals are Type I or Type II frequency-doubling crystal.
4, a kind of ultraviolet frequency double laser according to claim 1 is characterized in that: its frequency-doubling crystal is arranged between gain medium and the ultraviolet frequency double crystal, and the Walk-off crystal front and back position that is located at UV transparent is not limit.
5, a kind of ultraviolet frequency double laser according to claim 1, it is characterized in that: when the ultraviolet frequency double crystal is Type II type ultraviolet frequency double crystal, at the Walk-off of UV transparent crystal output wave plate is set, it is 1/2 wave plate, is full-wave plate to first-harmonic λ ultraviolet λ/4, perhaps at the Walk-off of UV transparent crystal input wave plate is set, it is 1/2 wave plate, is full-wave plate to first-harmonic λ frequency doubled light λ/2.
6, according to claim 1,2,4 or 5 described a kind of ultraviolet frequency double lasers, it is characterized in that: the output of its laser cavity is provided with planoconvex spotlight.
7, according to claim 1,2,4 or 5 described a kind of ultraviolet frequency double lasers, it is characterized in that: its laser cavity is separate type resonant cavity or micro-piece type laser cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100713408A CN101345390A (en) | 2008-07-03 | 2008-07-03 | Ultraviolet frequency double laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100713408A CN101345390A (en) | 2008-07-03 | 2008-07-03 | Ultraviolet frequency double laser |
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| Publication Number | Publication Date |
|---|---|
| CN101345390A true CN101345390A (en) | 2009-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100713408A Pending CN101345390A (en) | 2008-07-03 | 2008-07-03 | Ultraviolet frequency double laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326227A (en) * | 2013-05-20 | 2013-09-25 | 中国电子科技集团公司第四十一研究所 | 266nm ultraviolet laser generator |
-
2008
- 2008-07-03 CN CNA2008100713408A patent/CN101345390A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326227A (en) * | 2013-05-20 | 2013-09-25 | 中国电子科技集团公司第四十一研究所 | 266nm ultraviolet laser generator |
| CN103326227B (en) * | 2013-05-20 | 2016-03-02 | 中国电子科技集团公司第四十一研究所 | A kind of 266nm uv laser generator |
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Open date: 20090114 |