CN103022884B - Disc laser emitting 305nm continuous laser by pumping of Pr:KYF at 482.5nm - Google Patents
Disc laser emitting 305nm continuous laser by pumping of Pr:KYF at 482.5nm Download PDFInfo
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- CN103022884B CN103022884B CN201210574602.9A CN201210574602A CN103022884B CN 103022884 B CN103022884 B CN 103022884B CN 201210574602 A CN201210574602 A CN 201210574602A CN 103022884 B CN103022884 B CN 103022884B
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Abstract
The invention belongs to the technical field of laser and relates to a disc laser emitting 305nm continuous laser by pumping of Pr:KYF at 482.5nm. Heat effect of the prior art is high, energy utilization rate of pump light is low, and Pr:KYF is less effective in absorbing pump light. The disc laser is provided with a parabolic reflector located between Pr:KYF laser crystal and an output coupler. The parabolic reflector is provided with a through hole at the center. A parabolic reflector surface of the parabolic reflector faces to the Pr:KYF laser crystal. A total reflector is a metal heat sink, and one inner plane of a cavity of the total reflector is coated with a 482.5nm and 610nm highly-reflective film. The Pr:KYF laser crystal is sheeted and contacts with one inner mirror plane of the cavity of the total reflector. A start plane mirror axis, an end plane mirror axis and a resonant cavity axis are parallel and coplanar. A start plane mirror and a mirror surface of an end plane mirror face to the parabolic reflector surface of the parabolic reflector. The mirror surface and the parabolic reflector surface are coated with 482.5nm highly-reflective films. A pumping source provides 482.5nm pump light.
Description
Technical field
The present invention relates to the disc laser that a kind of 482.5nm pumping Pr:KYF obtains 305nm continuous laser, its pump light is 482.5nm laser, can obtain 305nm continuous laser through first overtone, and, the thermal effect of laser crystal is alleviated, pump energy utilance is improved, and the power that final effect is Output of laser is improved, and belongs to laser technology field.
Background technology
At present, the generation of Ultra-Violet Laser mainly contains two kinds of methods.Be to utilize non-linear frequency-doubling crystal to carry out a non-linear frequency multiplication near the fundamental frequency light 1 mum wavelength, recycle another piece frequency-doubling crystal the second harmonic obtaining is carried out to non-linear frequency multiplication, namely produce Ultra-Violet Laser by fundamental frequency light is carried out to quadruple; Another kind method is to utilize non-linear frequency-doubling crystal to carry out non-linear frequency multiplication near the fundamental frequency light 1 mum wavelength, recycle non-linear and frequently crystal fundamental frequency light and second harmonic are carried out non-linear and produce Ultra-Violet Laser frequently.Above-mentioned two kinds produce the methods of Ultra-Violet Lasers and all need nonlinear frequency transformation process twice, and because each conversion is all to have a certain proportion ofly, repeatedly conversion causes total conversion efficiency lower, is difficult to obtain high power ultraviolet continuous laser.
A kind of technology of passing through nonlinear frequency transformation and obtaining 305nm continuous laser so be born, paper " the All-solid-state blue laser pumped Pr:KY delivering as people such as Dong Yuan
3f
10-BBO ultraviolet laser at 305 nm " (Laser Phys. Lett. 9, No.2,116 ~ 119,2012) disclosed scheme.Full-solid-state blue pump laser is positioned at a side outside completely reflecting mirror chamber, and Pr:KYF laser crystal is positioned at the resonant cavity being made up of completely reflecting mirror and output coupling mirror, and the non-linear frequency-doubling crystal of BBO is positioned at resonant cavity and coaxial with Pr:KYF laser crystal.Under the excitation of the continuous pumping laser of 471nm, Pr:KYF laser crystal produces 610nm laser, by the non-linear frequency-doubling crystal intracavity frequency doubling of BBO, produces 305nm continuous laser.In this scheme, described Pr:KYF laser crystal long 5 mm, doping content 0.4 %, the non-linear frequency-doubling crystal of described BBO is of a size of 3 × 3 × 4 mm
3, cutting angle is θ=90 °, in output coupling mirror chamber, curvature mirror radius is 50 mm.The not enough first that this scheme exists is in the time that laser is in running order, its temperature of Pr:KYF laser crystal as gain media can obviously raise at short notice, there is very serious thermal effect, greatly reduced the performance of laser, be difficult to long-time steady operation; It two is that the utilance of energy is lower because pumping laser is single by gain media; Its three be at room temperature Pr:KYF laser crystal to 471 nm blue lasers absorb relatively a little less than, as shown in Figure 1, and Pr:KYF laser crystal to 482.5nm blue laser absorb stronger.These deficiencies make the light-light conversion efficiency of this laser lower.
Summary of the invention
For effective thermal effect that reduces Pr:KYF laser crystal, improve the utilance of pump energy, adopt Pr:KYF laser crystal to absorb stronger pump light, we have invented a kind of disc laser of 482.5nm pumping Pr:KYF acquisition 305nm continuous laser.
Obtain in the disc laser of 305nm continuous laser at the present invention's 482.5nm pumping Pr:KYF, completely reflecting mirror 1, Pr:KYF laser crystal 2, frequency-doubling crystal 3, output coupling mirror 4 arranged in co-axial alignment successively, as shown in Figure 2, it is characterized in that, the parabolic reflector 5 in addition of arranged in co-axial alignment, parabolic reflector 5 is between Pr:KYF laser crystal 2 and output coupling mirror 4, and parabolic reflector 5 cores have through hole, and its parabolic reflector is facing to Pr:KYF laser crystal 2; Completely reflecting mirror 1 is a kind of metal heat sink, and in chamber, a side plane minute surface is coated with the high-reflecting film of 482.5 nm, 610 nm; Pr:KYF laser crystal 2 is sheet, contacts with a side plane minute surface in completely reflecting mirror 1 chamber; Top plane mirror 6 axis, terminal plane mirror 7 axis, resonator axis three are parallel and be positioned at same plane, the reflective mirror of top plane mirror 6 and terminal plane mirror 7 is relative with the parabolic reflector minute surface of parabolic reflector 5, and described reflective mirror, parabolic reflector minute surface are coated with 482.5 nm high-reflecting films; Pumping source provides 482.5 nm pump lights.
Its technique effect of the present invention is, 482.5 nm pump light incident parabolic reflector minute surfaces, after reflection, be irradiated on Pr:KYF laser crystal 2, Pr:KYF laser crystal 2 produces 610 nm exciting lights, be transformed to 305 nm by wavelength after frequency-doubling crystal 3 frequencys multiplication, exciting light comes and goes by parabolic reflector 5 core through holes in resonant cavity, after resonance outside output coupling mirror 4 output cavities.See through the pump light of sheet Pr:KYF laser crystal 2 by a side plane mirror-reflection in completely reflecting mirror 1 chamber to parabolic reflector minute surface, through the secondary reflection again of terminal plane mirror 7 reflective mirrors, parabolic reflector minute surface, be again irradiated on Pr:KYF laser crystal 2 afterwards.This time see through the pump light of sheet Pr:KYF laser crystal 2 still successively by being finally irradiated on Pr:KYF laser crystal 2 after a side plane minute surface, parabolic reflector minute surface, top plane mirror 6 reflective mirrors, the reflection of parabolic reflector minute surface in completely reflecting mirror 1 chamber, and continue.Visible, pump light is propagated in the reflection space of a sealing, is repeatedly irradiated on Pr:KYF laser crystal 2, and pump energy utilance significantly improves.In addition, because Pr:KYF laser crystal 2 adopts sheet, and with completely reflecting mirror 1 good contact as a kind of metal heat sink, the temperature rise of Pr:KYF laser crystal 2 is effectively controlled, and significantly alleviates the thermal effect of Pr:KYF laser crystal.Have, the present invention adopts 482.5 nm wavelength lasers as pump light again, the 471 nm wavelength lasers that adopted compared to existing technology, and the pump light of Pr:KYF laser crystal absorbs to some extent and strengthens.Visible, the present invention's technical scheme round Realization goal of the invention.
Brief description of the drawings
Fig. 1 is KY
3f
10: 0.4%Pr
3+the abosrption spectrogram of laser crystal.Fig. 2 is the disc laser structural representation that the present invention's 482.5nm pumping Pr:KYF obtains 305nm continuous laser, and this figure is simultaneously as Figure of abstract.
Embodiment
Its concrete scheme of disc laser of the present invention's 482.5nm pumping Pr:KYF acquisition 305nm continuous laser is as follows.Completely reflecting mirror 1, Pr:KYF laser crystal 2, frequency-doubling crystal 3, output coupling mirror 4 arranged in co-axial alignment successively, as shown in Figure 2.Two end faces of Pr:KYF laser crystal 2 are coated with 610 nm anti-reflection films, and transmitance is greater than 99.9 %.Frequency-doubling crystal 3 adopts the non-linear frequency-doubling crystal of BBO, and two end faces are coated with 305nm anti-reflection film, and transmitance is greater than 99.9%.In output coupling mirror 4 chambeies, minute surface is concave spherical surface, the radius of curvature R of concave spherical surface
1be 100 mm, this concave spherical surface minute surface is coated with 610 nm high-reflecting films, 305 nm anti-reflection films, and transmitance is greater than 99.9 %.The parabolic reflector 5 in addition of arranged in co-axial alignment, parabolic reflector 5 is between Pr:KYF laser crystal 2 and output coupling mirror 4, and parabolic reflector 5 cores have through hole, and its parabolic reflector is facing to Pr:KYF laser crystal 2.Completely reflecting mirror 1 is a kind of metal heat sink, and material is red copper; In chamber, a side plane minute surface is coated with the high-reflecting film of 482.5 nm, 610 nm, and to the reflectivity of these two kinds of wavelength all higher than 99.9%.Pr:KYF laser crystal 2 is sheet, and as disk, its thickness is 0.5 ~ 1 mm, and sheet Pr:KYF laser crystal 2 contacts with a side plane minute surface in completely reflecting mirror 1 chamber.Top plane mirror 6 axis, terminal plane mirror 7 axis, resonator axis three are parallel and be positioned at same plane, the reflective mirror of top plane mirror 6 and terminal plane mirror 7 is relative with the parabolic reflector minute surface of parabolic reflector 5, and described reflective mirror, parabolic reflector minute surface are coated with 482.5 nm high-reflecting films.Pumping source provides 482.5 nm pump lights.
Completely reflecting mirror 1 has three effects, the one, dispel the heat for Pr:KYF laser crystal 2 as heat sink, the 2nd, form resonant cavity together with output coupling mirror 4, the 3rd, form a pump light sealing reflection space together with top plane mirror 6, parabolic reflector 5, terminal plane mirror 7.
The pumping source of the present invention's laser 482.5 nm pump lights is characterized in that, as shown in Figure 2, forms 908 nm resonance optical cavities by the first resonator mirror 8, Nd:YLF laser crystal 9, top plane mirror 6; Form 1030 nm resonance optical cavities by the second resonator mirror 10, Yb:YAG laser crystal 11, top plane mirror 6; 908 nm harmonic light cavity axis are vertical with 1030 nm harmonic light cavity axis and crossing, intersection point overlaps with plane coupling mirror 12 geometric centers, plane coupling mirror 12 and 908 nm harmonic light cavity axis and 1030 nm harmonic light cavity axis are all 45° angle relation, and plane coupling mirror 12 is simultaneously adjacent with Nd:YLF laser crystal 9 and Yb:YAG laser crystal 11; And frequency crystal 13 is on the resonant optical path between Yb:YAG laser crystal 11 and top plane mirror 6; 1030 nm harmonic light cavity axis and 6 deads in line of top plane mirror.In the first resonator mirror 8 chambeies, a side mirror face is concave spherical surface, the radius of curvature R of this concave spherical surface
2be 100 mm, this concave spherical surface is coated with 908 nm high-reflecting films, and reflectivity is greater than 99.9 %; The chamber outerplanar minute surface of this concave spherical surface and the first resonator mirror 8 is also all coated with 808 nm anti-reflection films, and transmitance is greater than 99.5 %.The plane minute surface of plane coupling mirror 12 both sides is all coated with 1030 nm anti-reflection films, and transmitance is greater than 99.5 %; Plane coupling mirror 12 is also coated with 908 nm high-reflecting films towards the plane minute surface of Nd:YLF laser crystal 9 one sides, and reflectivity is greater than 99.9 %.In the second resonator mirror 10 chambeies, a side mirror face is concave spherical surface, the radius of curvature R of this concave spherical surface
3be 100 mm, this concave spherical surface is coated with 1030 nm high-reflecting films, and reflectivity is greater than 99.9 %.In top plane mirror 6 chambeies, a side mirror face is coated with the high-reflecting film of 1030 nm, 908 nm, and reflectivity is greater than 99.9 %, be coated with 482.5 nm anti-reflection films, and transmitance is greater than 99.9 % simultaneously.Two end faces of Nd:YLF laser crystal 9 are coated with 908 nm anti-reflection films, and transmitance is greater than 99.9 %.Two end faces of Yb:YAG laser crystal 11 are coated with 1030 nm anti-reflection films, and transmitance is greater than 99.9 %.Adopt the non-linear and crystal frequently of LBO with frequency crystal 13, two end face is coated with 482.5 nm anti-reflection films, and transmitance is greater than 99.9 %.
Beam-expanding collimation lens 14 are coaxial and between top plane mirror 6 and parabolic reflector 5 with top plane mirror 6.
The 808 nm pump lights from semiconductor laser enter in Nd:YLF laser crystal 9 as it provides pump energy through the first resonator mirror 8, make quasi-three-level 908 nm spectral line transition in Nd:YLF laser crystal 9, and then form in chamber and vibrate in 908 nm resonance optical cavities, produce 908 nm quasi-three-level endovenous lasers, its part is used for Yb:YAG laser crystal 11 to carry out intracavity pump, make four-level 1030 nm spectral line transition in Yb:YAG laser crystal 11, and then form in chamber and vibrate in 1030 nm resonance optical cavities, produce 1030 nm four-level endovenous lasers, the remainder of it and 908 nm quasi-three-level endovenous lasers is by carrying out non-linear and frequently with frequency crystal 13, produce 482.5 nm laser, and ad initio transverse plane reflective mirror 6 is exported, after beam-expanding collimation lens 14, become the pump light of the present invention's laser.
Because Yb:YAG laser crystal 11 is positioned at 908 nm resonance optical cavities, the 908 nm quasi-three-level endovenous lasers that its pump energy is produced by Nd:YLF laser crystal 9 provide, this mode belongs to pump-coupling mode in chamber, which not only can provide sufficiently high pump energy for Yb:YAG laser crystal 11, can also effectively reduce the used heat of Yb:YAG laser crystal 11, reduce the Stokes shift between pump light photon and laser photon, improve Stokes efficiency.
Claims (6)
1. the disc laser of a 482.5nm pumping Pr:KYF acquisition 305nm continuous laser, in described disc laser, completely reflecting mirror (1), Pr:KYF laser crystal (2), frequency-doubling crystal (3), output coupling mirror (4) arranged in co-axial alignment successively, it is characterized in that, the parabolic reflector (5) in addition of arranged in co-axial alignment, parabolic reflector (5) is positioned between Pr:KYF laser crystal (2) and output coupling mirror (4), parabolic reflector (5) core has through hole, and its parabolic reflector is facing to Pr:KYF laser crystal (2); Completely reflecting mirror (1) is a kind of metal heat sink, and in chamber, a side plane minute surface is coated with the high-reflecting film of 482.5nm, 610nm; Pr:KYF laser crystal (2) is sheet, contacts with a side plane minute surface in completely reflecting mirror (1) chamber; Top plane mirror (6) axis, terminal plane mirror (7) axis, resonator axis three are parallel and be positioned at same plane, the reflective mirror of top plane mirror (6) and terminal plane mirror (7) is relative with the parabolic reflector minute surface of parabolic reflector (5), and described reflective mirror, parabolic reflector minute surface are coated with 482.5nm high-reflecting film; Pumping source provides 482.5nm pump light.
2. 482.5nm pumping Pr:KYF according to claim 1 obtains the disc laser of 305nm continuous laser, it is characterized in that, completely reflecting mirror (1) material is red copper.
3. 482.5nm pumping Pr:KYF according to claim 1 obtains the disc laser of 305nm continuous laser, it is characterized in that, its thickness of Pr:KYF laser crystal (2) is 0.5～1mm.
4. 482.5nm pumping Pr:KYF according to claim 1 obtains the disc laser of 305nm continuous laser, it is characterized in that, the pumping source structure of 482.5nm pump light is: form 908nm resonance optical cavity by the first resonator mirror (8), Nd:YLF laser crystal (9), top plane mirror (6); Form 1030nm resonance optical cavity by the second resonator mirror (10), Yb:YAG laser crystal (11), top plane mirror (6); 908nm harmonic light cavity axis is vertical with 1030nm harmonic light cavity axis and crossing, intersection point overlaps with plane coupling mirror (12) geometric center, plane coupling mirror (12) is all 45° angle relation with 908nm harmonic light cavity axis and 1030nm harmonic light cavity axis, and plane coupling mirror (12) is simultaneously adjacent with Nd:YLF laser crystal (9) and Yb:YAG laser crystal (11); And frequency crystal (13) is positioned on the resonant optical path between Yb:YAG laser crystal (11) and top plane mirror (6); 1030nm harmonic light cavity axis and top plane mirror (6) dead in line.
5. 482.5nm pumping Pr:KYF according to claim 4 obtains the disc laser of 305nm continuous laser, it is characterized in that, in the first resonator mirror (8) chamber, a side mirror face is concave spherical surface, this concave spherical surface is coated with 908nm high-reflecting film, and the chamber outerplanar minute surface of this concave spherical surface and the first resonator mirror (8) is also all coated with 808nm anti-reflection film; The plane minute surface of plane coupling mirror (12) both sides is all coated with 1030nm anti-reflection film, and plane coupling mirror 12 is also coated with 908nm high-reflecting film towards the plane minute surface of Nd:YLF laser crystal (9) one sides; In the second resonator mirror (10) chamber, a side mirror face is concave spherical surface, and this concave spherical surface is coated with 1030nm high-reflecting film; In top plane mirror (6) chamber, a side mirror face is coated with the high-reflecting film of 1030nm, 908nm, is coated with 482.5nm anti-reflection film simultaneously; Two end faces of Nd:YLF laser crystal (9) are coated with 908nm anti-reflection film; Two end faces of Yb:YAG laser crystal (11) are coated with 1030nm anti-reflection film; Non-linear and the frequency crystal with frequency crystal (13) employing LBO, two end face is coated with 482.5nm anti-reflection film.
6. 482.5nm pumping Pr:KYF according to claim 1 obtains the disc laser of 305nm continuous laser, it is characterized in that, beam-expanding collimation lens (14) are coaxial and be positioned between top plane mirror (6) and parabolic reflector (5) with top plane mirror (6).
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| CN103368050A (en) * | 2013-07-05 | 2013-10-23 | 中国人民解放军国防科学技术大学 | Optical pumping device for weakly adsorbing gain medium |
| CN105742945A (en) * | 2016-04-29 | 2016-07-06 | 长春理工大学 | Microchip laser device |
| CN107845948A (en) * | 2017-11-06 | 2018-03-27 | 华中科技大学 | A kind of disc laser of resonance intracavity pump |
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| US6724486B1 (en) * | 1999-04-28 | 2004-04-20 | Zygo Corporation | Helium- Neon laser light source generating two harmonically related, single- frequency wavelengths for use in displacement and dispersion measuring interferometry |
| US7197059B2 (en) * | 2002-05-08 | 2007-03-27 | Melles Griot, Inc. | Short wavelength diode-pumped solid-state laser |
| US20050169326A1 (en) * | 2004-01-30 | 2005-08-04 | Jacob James J. | Laser architectures for coherent short-wavelength light generation |
| WO2006087650A2 (en) * | 2005-02-17 | 2006-08-24 | Philips Intellectual Property & Standards Gmbh | All-solid-state uv laser system |
| GB0609599D0 (en) * | 2006-05-15 | 2006-06-21 | Fundaci Privada Inst De Ci Nci | Optical parametric oscillator |
| CN1870361A (en) * | 2006-07-11 | 2006-11-29 | 长春理工大学 | Semiconductor laser pumping double-channel passive Q regulation pulse sum frequency laser |
| CN101202405A (en) * | 2007-12-05 | 2008-06-18 | 山东大学 | Method for obtaining 192 nm ultraviolet laser by 1342 nm laser 7 frequency multiplication |
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Non-Patent Citations (1)
| Title |
|---|
| Y Dong，et al.All-solid-state blue laser pumped Pr:KY3F10-BBO ultraviolet laser at 305 nm.《Laser Physics Letters》.2011,第9卷(第2期),116-119. * |
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