CN104201551A - Laser and polarization compensating direct end pumping device thereof - Google Patents
Laser and polarization compensating direct end pumping device thereof Download PDFInfo
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- CN104201551A CN104201551A CN201410436660.4A CN201410436660A CN104201551A CN 104201551 A CN104201551 A CN 104201551A CN 201410436660 A CN201410436660 A CN 201410436660A CN 104201551 A CN104201551 A CN 104201551A
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Abstract
The invention relates to the field of the lasers and provides a laser and a polarization compensating direct end pumping device thereof. The polarization compensating direct end pumping device is used for the conversion of pump light and seed light, and comprises a pumping source, a first short-wave pass lens, a crystal, a second short-wave pass lens, a quarter-wave plate for polarization rotation of the pump light and a thermal focal length compensating reflector, all of which are located in the same optical axis and distributed in order. The pump light is output by the pump source and secondary polarization compensating pumping absorption of the pump light is realized in the optical axis; the seed light is incident correspondingly into the first short-wave pass lens in the optical axis and reflected to the second short-wave pass lens through the crystal; the seed light is reflected by the second short-wave pass lens. Due to the adopted laser and a polarization compensating direct end pumping device, the light-light conversion efficiency of a laser system can be greatly improved.
Description
Technical field
The present invention relates to field of lasers, relate in particular to a kind of laser and polarization compensation end face pump-coupling device thereof.
Background technology
Control effect for polarization of pumping beams will directly cause the absorbing state of laser crystal to pump light, thereby affects the stable output of laser.When adopting the pump light pumping Nd:YVO such as 808nm, 880nm, 888nm
4when crystal, crystal is parallel to the absorption of pump light of c-axis direction much larger than being parallel to the axial pump light of a to polarization direction, the pump light that so large absorption coefficient will cause being parallel to c-axis direction in very short several millimeters just by the strong absorption of crystal, but need just can be absorbed through very long transmission along a direction of principal axis polarised light; In addition, due to pump light in short distance very by absorption of crystal, can cause the temperature of crystal end-face sharply to raise, cause crystal thermal effect serious, whether damagedly directly have influence on crystal, and light light conversion efficiency is also lower.For example, the Nd:YVO that is 1at.% as Fig. 1 doping content
4the absorption spectra of crystal (a cutting), as can be seen from the figure, near 880nm wavelength, Nd:YVO
4crystal is the absorption coefficient difference to pump light on two axial directions, α
c=16cm
-1, α
a=5cm
-1; Near 808nm wavelength, Nd:YVO
4crystal is the absorption coefficient difference to pump light on two axial directions, α
c=35cm
-1, α
a=18cm
-1.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of laser and polarization compensation end face pump-coupling device thereof, for improving the light light conversion efficiency of Optical Maser System.
In order to solve above technical problem, the invention provides a kind of polarization compensation end face pump-coupling device, for the conversion of pump light and seed light, it comprises and is positioned at the pumping source that distributes successively on same optical axis, the first short-pass eyeglass, crystal, the second short-pass eyeglass, quarter-wave plate and thermal focal compensatory reflex mirror for the rotation of pump light polarization; Described pump light is exported by pumping source, and on described optical axis, realizes secondary polarization compensation pump absorption; The first short-pass eyeglass incident in the corresponding described optical axis of described seed light, and reflection is through crystal to the second short-pass eyeglass, by the second short-pass lens reflecting seed light.
Preferably, the two-sided of described first, second short-pass eyeglass is coated with pump light transmission film, and one side is coated with seed light reflectance coating, and it is for transmission pump light and reflection seed light.
Preferably, the two-sided of the first short-pass eyeglass of described seed light incident place is coated with pump light transmission film, and one side is coated with 45 ° of reflectance coatings of seed light; The two-sided pump light transmission film that is coated with of the second short-pass eyeglass of described seed light outgoing place, its one side is coated with seed light reflectance coating, described seed light reflection plated film is 45 ° or 0 °, when described plated film is 45 ° of films, the gain of seed light single is amplified, when described plated film is 0 ° of film, two gains of seed light are amplified.
Preferably, described pumping source is one of in the folded battle array of fiber coupling module, LD, BAR bar, and its pumping source wavelength is 808nm, 888nm, 880nm.
Preferably, the two-sided transmission film that is coated with pump light and seed light of described crystal, described crystal is crystal different to the absorption coefficient of pump light in two crystalline axis direction.
Preferably, the two-sided pump light anti-reflection film that is coated with of described quarter-wave plate, for realizing the rotation of pumping polarisation of light, twice process quarter-wave plate of described pump light, to realize the phase angle half-twist between pump light π polarization and σ polarization.
Preferably, described thermal focal compensatory reflex mirror is the speculum that convex surface is coated with 0 ° of reflectance coating of pump light.
In order to solve above technical problem, the invention provides a kind of laser, it has a kind of polarization compensation end face pump-coupling device.
The invention provides a kind of laser and polarization compensation end face pump-coupling device thereof, by adopting polarization compensation end face pump-coupling technology, can greatly improve the light light conversion efficiency of Optical Maser System.
Brief description of the drawings
Fig. 1 is the Nd:YVO that in prior art, doping content is 1at.%
4the absorption spectra of a cutting in crystal;
Fig. 2 is the one way enlarged diagram of polarization compensation end face pump-coupling device of the present invention;
Fig. 3 is the round trip enlarged diagram of polarization compensation end face pump-coupling device of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail.
Please refer to Fig. 2 and Fig. 3, the invention provides a kind of polarization compensation end face pump-coupling device, for the conversion of pump light and seed light, it comprises and is positioned at the pumping source 10 that distributes successively on same optical axis, the first short-pass eyeglass 20, crystal 30, the second short-pass eyeglass 40, quarter-wave plate 50 and thermal focal compensatory reflex mirror 60 for the rotation of pump light polarization.Described pump light is exported by pumping source 10, and on described optical axis, realizes secondary polarization compensation pump absorption; The first short-pass eyeglass 20 incidents in the corresponding described optical axis of described seed light, and reflection is through crystal 30 to second short-pass eyeglasses 40, reflects seed light by the second short-pass eyeglass 40.
In above device, can realize pump light optical path and seed light optical path.
Wherein, in described pump light optical path, pump light is through the first short-pass eyeglass 20, crystal 30, the second short-pass eyeglass 40, quarter-wave plate 50, reflect through thermal focal compensatory reflex mirror 60, again pass through quarter-wave plate 50, the second short-pass eyeglass 40, crystal 30, the first short-pass eyeglass 20, to realize the secondary polarization compensation pump absorption of pump light.
Wherein, described seed light optical path be seed light through the first short-pass eyeglass 20 reflect, through crystal 30 transmissions, through the second short-pass eyeglass 40 reflection outputs.
In the present invention, with a-cut Nd:YVO
4crystal is that example describes, and adopts LD fiber coupling module pumping crystal 30, and pump light is circularly polarized light, is made up of π polarization and σ polarization.When pump light incident crystal 30 for the first time from left to right, because absorption of crystal π polarised light is much larger than σ polarization, cause π polarised light to be absorbed in a large number, in residual pump light, π polarization is much smaller than σ polarization; Residual pump light is through thermal focal compensatory reflex mirror 60, twice through quarter-wave plate 50, σ polarization is rotated as π polarization passes through crystal 30 again, realizes secondary polarization compensation pump light and absorbs, and realizes polarization compensation pump technology and be the secondary pumping key problem in technology of raising the efficiency that is coupled.And in the present embodiment, the two-sided of described first, second short-pass eyeglass 20,40 is coated with pump light transmission film, and one side is coated with seed light reflectance coating, and it is for transmission pump light and reflection seed light.Specifically, the two-sided of the first short-pass eyeglass 20 of described seed light incident place is coated with pump light transmission film, and one side is coated with 45 ° of reflectance coatings of seed light; The two-sided pump light transmission film that is coated with of the second short-pass eyeglass 40 of described seed light outgoing place, its one side is coated with seed light reflectance coating, described seed light reflection plated film is 45 ° or 0 °, when described plated film is 45 ° of films, the gain of seed light single is amplified, when described plated film is 0 ° of film, two gains of seed light are amplified.
For above device, in general, described pumping source 10 is one of in the folded battle array of fiber coupling module, LD, BAR bar, realizes pump light output, and for pumping pumping crystal 30, its wavelength is preferably 808nm, 888nm, 880nm, but is not limited to this wavelength; Described crystal 30 is crystal 30 different to the absorption coefficient of pump light in two crystalline axis direction, its two-sided transmission film that is coated with pump light and seed light, and by the energy of absorptive pumping light, the energy of realizing seed light amplifies; The two-sided pump light anti-reflection film that is coated with of described quarter-wave plate 30, for realizing the rotation of pumping polarisation of light, twice process quarter-wave plate 50 of pump light, realizes the conversion between pump light π polarization and σ polarization, i.e. phase angle half-twist; Described thermal focal compensatory reflex mirror 60 is speculums that convex surface is coated with 0 ° of reflectance coating of pump light, realizes for crystal 30 absorptive pumping light the thermal focal that causes thermal effect to produce.
The invention provides a kind of polarization compensation end face pump-coupling device, by adopting polarization compensation end face pump-coupling technology, can greatly improve the light light conversion efficiency of system.In addition, polarization compensation end face pump-coupling device of the present invention can be in any laser, as laser oscillator, power amplifier etc.
Be understandable that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion by technical conceive according to the present invention, and all these change the protection range that all should belong to the claims in the present invention with distortion.
Claims (8)
1. a polarization compensation end face pump-coupling device, for pump light and seed light conversion, it is characterized in that, comprise and be positioned on same optical axis the pumping source that distributes successively, the first short-pass eyeglass, crystal, the second short-pass eyeglass, quarter-wave plate and thermal focal compensatory reflex mirror for the rotation of pump light polarization; Described pump light is exported by pumping source, and on described optical axis, realizes secondary polarization compensation pump absorption; The first short-pass eyeglass incident in the corresponding described optical axis of described seed light, and reflection is through crystal to the second short-pass eyeglass, by the second short-pass lens reflecting seed light.
2. device according to claim 1, is characterized in that, the two-sided of described first, second short-pass eyeglass is coated with pump light transmission film, and one side is coated with seed light reflectance coating, and it is for transmission pump light and reflection seed light.
3. device according to claim 2, is characterized in that, the two-sided of the first short-pass eyeglass of described seed light incident place is coated with pump light transmission film, and one side is coated with 45 ° of reflectance coatings of seed light; The two-sided pump light transmission film that is coated with of the second short-pass eyeglass of described seed light outgoing place, its one side is coated with seed light reflectance coating, described seed light reflection plated film is 45 ° or 0 °, when described plated film is 45 ° of films, the gain of seed light single is amplified, when described plated film is 0 ° of film, two gains of seed light are amplified.
4. device according to claim 1, is characterized in that, described pumping source is one of in the folded battle array of fiber coupling module, LD, BAR bar.
5. device according to claim 1, is characterized in that: the two-sided transmission film that is coated with pump light and seed light of described crystal, described crystal is crystal different to the absorption coefficient of pump light in two crystalline axis direction.
6. device according to claim 1, it is characterized in that, the two-sided pump light anti-reflection film that is coated with of described quarter-wave plate, be used for realizing the rotation of pumping polarisation of light, twice process quarter-wave plate of described pump light, to realize the phase angle half-twist between pump light π polarization and σ polarization.
7. device according to claim 1, is characterized in that, described thermal focal compensatory reflex mirror is the speculum that convex surface is coated with 0 ° of reflectance coating of pump light.
8. a laser, is characterized in that, has the polarization compensation end face pump-coupling device as described in claim 1 to 7.
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| CN201410436660.4A CN104201551A (en) | 2014-08-28 | 2014-08-28 | Laser and polarization compensating direct end pumping device thereof |
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| CN201410436660.4A CN104201551A (en) | 2014-08-28 | 2014-08-28 | Laser and polarization compensating direct end pumping device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129800A (en) * | 2016-08-23 | 2016-11-16 | 天水师范学院 | A kind of based on single pumping or the dual wavelength tunable laser of double pumping action |
| WO2019109235A1 (en) * | 2017-12-05 | 2019-06-13 | 大族激光科技产业集团股份有限公司 | All solid-state laser light source device |
| CN110521070A (en) * | 2017-04-19 | 2019-11-29 | Eo 科技股份有限公司 | Laser amplification device |
| CN116929724A (en) * | 2023-09-13 | 2023-10-24 | 武汉鑫岳光电科技有限公司 | Device and method for measuring thermal focal length of laser medium |
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| US20080095210A1 (en) * | 2006-10-20 | 2008-04-24 | Murdoch Keith M | Optical pumping method for gain-media with polarization sensitive absorption |
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| US6141143A (en) * | 1998-05-01 | 2000-10-31 | Light Solutions Corporation | CW laser amplifier |
| US20080095210A1 (en) * | 2006-10-20 | 2008-04-24 | Murdoch Keith M | Optical pumping method for gain-media with polarization sensitive absorption |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129800A (en) * | 2016-08-23 | 2016-11-16 | 天水师范学院 | A kind of based on single pumping or the dual wavelength tunable laser of double pumping action |
| CN106129800B (en) * | 2016-08-23 | 2022-11-15 | 天水师范学院 | Dual-wavelength tunable laser based on single pump or double pumps |
| CN110521070A (en) * | 2017-04-19 | 2019-11-29 | Eo 科技股份有限公司 | Laser amplification device |
| WO2019109235A1 (en) * | 2017-12-05 | 2019-06-13 | 大族激光科技产业集团股份有限公司 | All solid-state laser light source device |
| CN110663145A (en) * | 2017-12-05 | 2020-01-07 | 大族激光科技产业集团股份有限公司 | All-solid-state laser light source device |
| US11005229B2 (en) | 2017-12-05 | 2021-05-11 | Han's Laser Technology Industry Group Co., Ltd. | All solid-state laser light source device |
| CN110663145B (en) * | 2017-12-05 | 2021-10-12 | 大族激光科技产业集团股份有限公司 | All-solid-state laser light source device |
| CN116929724A (en) * | 2023-09-13 | 2023-10-24 | 武汉鑫岳光电科技有限公司 | Device and method for measuring thermal focal length of laser medium |
| CN116929724B (en) * | 2023-09-13 | 2023-12-08 | 武汉鑫岳光电科技有限公司 | Device and method for measuring thermal focal length of laser medium |
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