CN2772074Y - Intracavity frequency doubling micro plate laser - Google Patents
Intracavity frequency doubling micro plate laser Download PDFInfo
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- CN2772074Y CN2772074Y CN 200520068583 CN200520068583U CN2772074Y CN 2772074 Y CN2772074 Y CN 2772074Y CN 200520068583 CN200520068583 CN 200520068583 CN 200520068583 U CN200520068583 U CN 200520068583U CN 2772074 Y CN2772074 Y CN 2772074Y
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- frequency
- crystal
- gain medium
- frequency doubling
- wave plate
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Abstract
The utility model discloses an intra-cavity frequency doubling microplate laser device, which comprises an LD, a collimating focusing lens, a laser gain medium and an intra-cavity frequency doubling crystal, wherein a wave plate is arranged between the laser gain medium and the intra-cavity frequency doubling crystal. The wavelength of the wave plate corresponding to the wavelength of frequency doubling light is 1/2 wave plate. The laser gain medium is a double refraction type laser gain medium crystal, and the intra-cavity frequency doubling crystal is a secondary class phase matching frequency doubling crystal. When the structure is adopted, because the addition of the wave plate, the polarization of the output light of the intra-cavity frequency doubling laser device is enhanced. Thereby, the output of polarized light which has a higher extinction ratio can be obtained.
Description
Affiliated technical field
The utility model relates to a kind of laser, especially a kind of micro-slice laser of High Extinction Ratio polarization output frequency doubled light.
Background technology
In semiconductor pump laser, the intracavity frequency doubling laser of micro sheet structure is a kind of high efficiency, the laser of compact conformation.Typical a kind of micro-slice laser is as shown in Figure 1: 101 is semiconductor laser (LD) among the figure, and 102,103 are the collimation condenser lens, and 104 is birefringence mode gain medium crystal, and 105 is two class phase matched frequency-doubling crystals.S
1', S
2' be two plated film chamber faces of micro-slice laser.λ wherein
1Be LD pump light wavelength, λ
2Be microchip laser fundamental wavelength, λ
2/ 2 is micro-slice laser frequency multiplication light wavelength.Common S
1' face plates λ
1Anti-reflection, to λ
2High anti-reaching to λ
2/ 2 also high anti-retes; S
2' face plates λ
2High anti-, to λ
2/ 2 anti-reflection retes.Because on two class phase matched frequency-doubling crystals 105, produce two rightabout frequency doubled lights, to reverse λ
2/ 2 have two kinds of processing methods usually: the one, and at S
1' on the face plating to λ
2/ 2 is anti-reflection, and its shortcoming is to lose half frequency doubled light, in addition from S
1' frequency doubled light that sees through of face shines on the LD and can produce strong diffuse reflection, have a strong impact on from S
2' face output light beam quality; So adopt second kind of way usually, promptly at S
1' on the face plating to λ
2/ 2 high-reflecting films.Because birefringence mode gain medium crystal 104 and two class phase matched frequency-doubling crystals, 105 optical axises are mutually in angle of 45 degrees on the common position, birefringence mode gain medium crystal 104 is a wave plate from two class phase matched frequency-doubling crystals, 105 reverse frequency doubled lights relatively, the reverse frequency doubled light of 105 outgoing passes birefringence mode gain medium crystal 104 for twice and makes two class phase matched frequency-doubling crystals, 105 backlight polarization directions be in nondeterministic statement through reflecting, like this from S
2' face output frequency doubled light polarization extinction ratio will change with various lasers, different ambient temperature, and the application scenario of a lot of laser needs the output of High Extinction Ratio polarization laser.
The utility model content
The purpose of this utility model is to provide a kind of intracavity frequency doubling micro-chip laser device of High Extinction Ratio polarization output.
For achieving the above object, the utility model adopts following structure: a kind of micro-slice laser of intracavity frequency doubling, comprise LD, collimation condenser lens, gain medium and intracavity frequency doubling crystal, wherein, be provided with a wave plate between described gain medium and the intracavity frequency doubling crystal, the relative frequency doubled light wavelength of the wavelength of described wave plate is 1/2 wave plate.
Described gain medium is a birefringence mode gain medium crystal, and the intracavity frequency doubling crystal is two class phase matched frequency-doubling crystals.
Described wave plate optical axis is θ/2 or 45 °+θ/2 with the angle of the birefringence mode gain medium optical axis of crystal on optical direction, and wherein θ is the angle of the birefringence mode gain medium optical axis of crystal and frequency doubled light polarization direction on the optical direction.
Birefringence mode gain medium crystal front end face is coated with pump light anti-reflection, and to fundamental frequency light and the high anti-film of frequency doubled light, two class phase matched frequency-doubling crystal rear end faces are coated with fundamental frequency light high anti-, to the anti-reflection film of frequency doubled light.
Adopt said structure,, thereby can obtain polarised light output than High Extinction Ratio because the adding of wave plate makes intracavity frequency doubling laser export the polarisation of light raising.
Description of drawings
Fig. 1 is the existing structure schematic diagram.
Fig. 2 is the utility model structural representation.
Fig. 3 (a) is the optical axis direction schematic diagram of the utility model crystal and wave plate.
Fig. 3 (b) is second kind of optical axis direction schematic diagram of the utility model crystal and wave plate.
Embodiment
Consult accompanying drawing, among Fig. 2,201 is LD, and 202,203 are the collimation condenser lens, and 204 is birefringence mode gain media crystal, and 205 is wave plate, and 206 is two class phase matched frequency-doubling crystals.λ
1Be LD pump light wavelength, λ
2Be laser fundamental wavelength, λ
2/ 2 is the frequency doubled light wavelength.S
1For front facet is birefringence mode gain medium crystal 2 04 front end face, S
2For rear facet is two class phase matched frequency-doubling crystals, 206 rear end faces.S
1Face of pumped light λ
1Anti-reflection, to fundamental frequency light λ
2With frequency doubled light λ
2/ 2 is high anti-, S
2In the face of first-harmonic λ
2High anti-, to frequency doubled light λ
2/ 2 is anti-reflection.
Fig. 3 (a), Fig. 3 (b) are the optical axis direction schematic diagram on 204,205,206 optical directions, its arrow representation element optical axis direction.Common two class phase matched frequency-doubling crystals 206 are 45 degree with wave plate 205 angles.205 is 1/2 wave plate of relative frequency doubled light.Usually frequency doubled light polarization direction relative two class phase matched frequency-doubling crystals 206 optical axis directions are parallel or vertical, so when 205 optical axis directions and birefringence mode gain medium crystal 2 04 optical axis direction are 22.5 degree or 67.5 and spend, the reverse frequency doubled light that comes out from two class phase matched frequency-doubling crystals 206 is for the first time by behind the birefringence mode gain medium crystal 2 04, frequency doubled light polarization direction perpendicular or parallel birefringence mode gain medium crystal 2 04 optical axis, birefringence mode gain medium crystal 2 04 relative frequency doubled light no longer has wave-plate effect, frequency doubled light λ like this
2/ 2 when reflecting back into wave plate 205 surface, its polarization direction will remain unchanged, will parallel or vertical birefringence mode gain medium crystal 2 04 optical axis, when frequency doubled light passes through wave plate 205 once more, enter wave plate polarization direction before with returning to, thereby guarantee that its direction is consistent with two class phase matched frequency-doubling crystals, 206 forward frequency doubled light polarization directions, thereby realize the frequency doubled light of High Extinction Ratio linear polarization output.
When birefringence mode gain medium crystal 2 04 optical axis and frequency doubled light polarization direction are when departing from any angle θ of 45 degree, then wave plate optical axis and birefringence mode gain medium crystal 2 04 optical axis are θ/2 jiao, or
Perpendicular or parallel 204 optical axises in frequency doubled light polarization direction are promptly realized making in the angle, obtain the polarization frequency doubled light output of High Extinction Ratio.
Birefringence mode gain medium crystal described in the utility model can be Nd:YVO
4, Nd:YLF, Nd:GdVO
4In crystal, two class phase matched frequency-doubling crystals can be KTP, BBO, LBO, LiNbO
3, non-linear frequency-doubling crystal such as BIBO.
Claims (4)
1, a kind of micro-slice laser of intracavity frequency doubling, comprise LD, collimation condenser lens, gain medium and intracavity frequency doubling crystal, it is characterized in that: be provided with a wave plate between described gain medium and the intracavity frequency doubling crystal, the relative frequency doubled light wavelength of the wavelength of described wave plate is 1/2 wave plate.
2, the micro-slice laser of a kind of intracavity frequency doubling as claimed in claim 1 is characterized in that: described gain medium is a birefringence mode gain medium crystal, and the intracavity frequency doubling crystal is two class phase matched frequency-doubling crystals.
3, the micro-slice laser of a kind of intracavity frequency doubling as claimed in claim 2, it is characterized in that: described wave plate optical axis is θ/2 or 45 °+θ/2 with the angle of the birefringence mode gain medium optical axis of crystal on optical direction, and wherein θ is the angle of the birefringence mode gain medium optical axis of crystal and return frequency doubled light polarization direction on the optical direction.
4, the micro-slice laser of a kind of intracavity frequency doubling as claimed in claim 2, it is characterized in that: birefringence mode gain medium crystal front end face is coated with pump light anti-reflection, to fundamental frequency light and the high anti-film of frequency doubled light, two class phase matched frequency-doubling crystal rear end faces are coated with fundamental frequency light high anti-, to the anti-reflection film of frequency doubled light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068583 CN2772074Y (en) | 2005-01-21 | 2005-01-21 | Intracavity frequency doubling micro plate laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068583 CN2772074Y (en) | 2005-01-21 | 2005-01-21 | Intracavity frequency doubling micro plate laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2772074Y true CN2772074Y (en) | 2006-04-12 |
Family
ID=36705858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520068583 Expired - Lifetime CN2772074Y (en) | 2005-01-21 | 2005-01-21 | Intracavity frequency doubling micro plate laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2772074Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427875C (en) * | 2006-10-27 | 2008-10-22 | 清华大学 | Laser confocal feedback micro measuring device |
| CN102112903B (en) * | 2008-06-10 | 2013-11-06 | 康宁股份有限公司 | Folded adjustable optical path in a frequency doubled semiconductor laser |
-
2005
- 2005-01-21 CN CN 200520068583 patent/CN2772074Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427875C (en) * | 2006-10-27 | 2008-10-22 | 清华大学 | Laser confocal feedback micro measuring device |
| CN102112903B (en) * | 2008-06-10 | 2013-11-06 | 康宁股份有限公司 | Folded adjustable optical path in a frequency doubled semiconductor laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150121 Granted publication date: 20060412 |