CN104092094A - 604nm orange light full-solid laser device for blue light pumping praseodymium-doped yttrium lithium fluoride - Google Patents
604nm orange light full-solid laser device for blue light pumping praseodymium-doped yttrium lithium fluoride Download PDFInfo
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- CN104092094A CN104092094A CN201410376433.7A CN201410376433A CN104092094A CN 104092094 A CN104092094 A CN 104092094A CN 201410376433 A CN201410376433 A CN 201410376433A CN 104092094 A CN104092094 A CN 104092094A
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Abstract
The invention provides a 604nm orange light full-solid laser device for blue light pumping praseodymium-doped yttrium lithium fluoride, and relates to a full-solid laser device. The 604nm orange light full-solid laser device is provided with a 444nm blue light semiconductor laser device, a shaping prism, a focusing prism, a plane input mirror, a Pr:YLF laser crystal, a glass thin sheet, a laser output mirror and a blue light optical filter, wherein the 444nm blue light semiconductor laser device is used as a pumping source of the 604nm orange light full-solid laser device; the shaping prism is located at the output end of the 444nm blue light semiconductor laser device; the focusing lens is arranged at the output end of the shaping prism; the plane input mirror is located at the output end of the focusing prism; the input end surface of the Pr:YLF laser crystal is close to the plane input mirror; the glass thin sheet is arranged at the output end of the Pr:YLF laser crystal; the laser output mirror is arranged at the output end of the glass thin sheet; the blue light optical filter is arranged at the output end of the laser output mirror and is used for filtering 444nm pumping light which is not completely absorbed, so that 604nm single-wavelength orange lasers can be output.
Description
Technical field
The present invention relates to a kind of all solid laser, especially relate to a kind of 444nm blue-light semiconductor laser pumping and mix the 604nm orange light all solid laser of praseodymium lithium yttrium fluoride (Pr:YLF).
Background technology
Visible ray solid state laser based on mixing praseodymium (Pr) material is the focus in Laser Study field in recent years.Pr:YLF laser crystal has the Laser emission spectral line of multiple wavelength such as 604nm, 607nm in orange optical band, although the stimulated emission cross section of 604nm is larger than the stimulated emission cross section of 607nm, but because the heavy absorption loss of 604nm is (referring to document B Xu et al., " Highly efficient InGaN-LD-pumped bulk Pr:YLF orange laser at 607nm ", Optics Communication Vol.305, pp.96 (2013)), cause 604nm in resonant cavity to be in the competition of 607nm in weak tendency, so be difficult at room temperature obtain 604nm.Carry out frequency-selecting for two adjacent wavelength, the different laser line in polarization direction, generally adopt and in chamber, insert polarization spectroscope PBS (referring to document Bo Wu et al., " Compact dual-wavelength Nd:GdVO
4laser working at 1063 and 1065 nm "; Optics Express Vol.17; pp.6004 (2009)); or in chamber, insert etalon method (referring to document Y.P.Huang et al., " Orthogonally polarized dual-wavelength Nd:LuVO
4laser at 1086 nm and 1089 nm "; Optics Express Vol.20; pp.5644 (2012)); the present invention adopts the glass flake that inserts 0.1mm with Brewster's angle in resonant cavity to carry out polarization frequency-selecting; suppressed π direction polarised light 607nm, makes σ direction polarised light 604nm form laser generation.
Rarely has in the world at present the report that obtains Pr:YLF crystal 604nm laser, and the method that obtains orange light is mainly by frequency multiplication and sum of fundamental frequencies technology at present, or by strengthening the method for pumping light power, the experimental design of frequency multiplication, sum of fundamental frequencies technology is comparatively complicated, and the 604nm laser that high power pump obtains exists great unsteadiness.
Summary of the invention
The object of the invention is to for the deficiency that rarely has at present the Pr:YLF all solid laser that obtains 604nm new wavelength, a kind of orange light all solid laser of 604nm that can stablize output, blue light pumping simple to operation and mix praseodymium lithium yttrium fluoride is provided.
The present invention is provided with:
444nm blue-light semiconductor laser, as the pumping source of 604nm orange light all solid laser;
Shaping prism, shaping prism is positioned at the output of 444nm blue-light semiconductor laser, and shaping prism is triangle and is coated with blue light anti-reflection film system; Shaping prism, for realizing the shaping of pump light hot spot, makes the pump spot of strip be shaped as approaching square;
Condenser lens, condenser lens is located at the output of shaping prism; Condenser lens is for realizing the focusing of pump beam after shaping;
Plane input mirror, plane input mirror is positioned at the output of condenser lens, as the input mirror of 604nm orange light all solid laser;
Pr:YLF laser crystal, the input end face of Pr:YLF laser crystal is close to plane input mirror;
Glass flake, glass flake is located at the output of Pr:YLF laser crystal, and the thickness of glass flake is 0.1mm;
Laser output mirror, laser output mirror is located at the output of glass flake, as the outgoing mirror of 604nm orange light all solid laser;
Blue filter, blue filter is located at the output of laser output mirror, for filtering the 444nm pump light not being completely absorbed, thereby makes to be output as the orange laser of the mono-wavelength of 604nm.
The plated film rete of described plane input mirror is saturating at 444nm place height, simultaneously thoroughly high at 640nm place, at 607nm, 604nm place height instead, i.e. and the multilayer dielectric film of reflectivity R>99.5%.
The plated film rete of described laser output mirror is at 607nm, the part transmission of 604nm place, the i.e. multilayer dielectric film of transmissivity T<10%.
Described glass flake has etalon effect: if insert in resonant cavity with Brewster's angle, the loss that can strengthen the 607nm laser of π direction polarization on the one hand, make the threshold value of 604nm laser of σ direction polarization lower than the 607nm laser threshold on π polarization direction, make the preferential starting of oscillation of 604nm laser; The 607nm laser of π direction polarization with keen competition and the 604nm laser of σ direction polarization can be separated on the other hand, thereby effectively sharp the penetrating of 607nm be restrained, obtain the sharp of 604nm and penetrate.
Beneficial effect of the present invention is as follows:
The present invention inserts the glass flake that can be used as etalon in chamber and carries out polarization frequency-selecting, in Pr:YLF laser crystal, realize the continuous operation of the 604nm laser with new wavelength of 444nm blue light LD pumping Pr:YLF, this expands application by the Pr:YLF laser for orange optical band and brings important academic significance and use value.As can be seen here, the present invention utilizes the etalon effect of glass flake to realize frequency-selecting, point polarization, adopts blue-light semiconductor laser pumping Pr:YLF crystal to realize the output of new wavelength 604nm orange light.New wavelength 604nm orange light all solid laser of the present invention can be stablized output, and method is simple, bring important academic significance for the Pr:YLF laser of orange optical band expands application, widened application prospect and the use value of visible laser in fields such as environmental monitoring, laser radar, spectrum analyses simultaneously.
Brief description of the drawings
Fig. 1 is the structure composition schematic diagram of the embodiment of the present invention.Arrow in Fig. 1 represents optical axis direction.
Fig. 2 is the 0.1mm heavy sheet glass sheet transmissivity of the embodiment of the present invention and the comparison diagram of Pr:YLF emission spectra.In Fig. 2, abscissa represents wavelength (nm); The ordinate in left side represents the transmissivity of this glass flake; Right side ordinate represents stimulated emission cross section long-pending (10
-21cm
2).
Fig. 3 is embodiment of the present invention Output of laser spectrogram.In Fig. 3, abscissa represents wavelength (nm); Ordinate is the luminous intensity that a certain wavelength is corresponding (a.u.).
Fig. 4 is embodiment of the present invention input-output characteristic curve.In Fig. 4, abscissa represents the absorbed power (mW) of crystal; Ordinate is the power (mW) of output light.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Referring to Fig. 1, the present embodiment is provided with 444nm blue-light semiconductor laser 1, shaping prism 2, condenser lens 3, plane input mirror 4, Pr:YLF laser crystal 5, glass flake 6, laser output mirror 7 and blue filter 8 that 0.1mm is thick.
444nm blue-light semiconductor laser 1 is as the pumping source of 604nm orange light all solid laser;
Shaping prism 2 is positioned at the output of 444nm blue-light semiconductor laser 1;
Condenser lens 3 is located at the output of shaping prism 2, together with shaping prism 2, pump beam is carried out to shaping and focusing, makes the abundant absorptive pumping light of gain media, improves the absorption efficiency of pump light, makes focal beam spot enough little simultaneously;
Plane input mirror 4 is located at the output of condenser lens 3, adopt and plate 444nm, 640nm height thoroughly and the multilayer dielectric film of 607nm, 604nm high anti-(R>99.5%), as the input mirror of laser, suppress the laser generation of 640nm wavelength;
Pr:YLF laser crystal 5, crystal doping concentration is 0.2.at.%, and length is 8mm, and its input end face is plane input mirror 4 and then;
The glass flake 6 that 0.1mm is thick, is located at the output of Pr:YLF laser crystal 5, for suppressing the laser generation of 607nm;
Laser output mirror 7 is located at the output of the glass flake 6 that 0.1mm is thick, adopts the multilayer dielectric film of plating 607nm, the transmission of 604nm part, has suppressed the laser generation of 640nm wavelength, and as the outgoing mirror of 604nm laser.
Blue filter 8 is located at the output of laser output mirror 7, for filtering the 444nm pump light not being completely absorbed, thereby makes to be output as the orange laser of the mono-wavelength of 604nm.
Described plane input mirror adopts plating 444nm, 604nm height thoroughly and the multilayer dielectric film of 607nm, 604nm high anti-(R>99.5%), as pump light input mirror.
Described laser output mirror adopts the multilayer dielectric film of plating 604nm, 607nm part transmission (transmissivity is respectively T=3.38%, T=3.45%), as the outgoing mirror of 604nm orange light.
The present embodiment, in order to make pump light emission spectra and Pr:YLF laser crystal absorption spectra realize optimum Match, improves the absorption efficiency of pump light, adopts 444nm blue light LD as pumping source.By being coated with the adjusting of shaping prism and condenser lens of the anti-reflection deielectric-coating of 444nm, optimize the pattern of pump light in laser crystal, further improve the utilization ratio of pump light.Utilize the characteristic of etalon effect and the Brewster's angle of 0.1mm glass flake, in experiment, realized the polarization selection effect stable to 607nm, 604nm, make the laser starting of oscillation threshold value of 607nm larger than 604nm, effectively suppressed the laser generation of 607nm.Meanwhile, the present invention is chosen in and on the chamber mirror of laserresonator, plates the effect that specific rete is selected to reach wavelength.Plane input mirror is coated with the high saturating and high anti-deielectric-coating of (R>99.5%) of 607nm, 604nm of 444nm, 640nm, and laser output mirror adopts the multilayer dielectric film of 604nm, 607nm part transmission (transmissivity is respectively T=3.38%, T=3.45%).The present invention inputs the special plated film rete design of mirror and laser output mirror by plane and to insert 0.1mm glass flake in chamber, Brewster's angle angle, suppress the more laser generation of intense line 607nm, 640nm, 607nm can have been vibrated in resonant cavity and form continuous light output.In addition, for cavity, choose more insensitive to thermal effect, to have large mode-controller volume plano-concave stable cavity structure, improved the output stability of laser.
Referring to Fig. 2, sheet glass (inserting with the Brewster's angle) transmissivity that Fig. 2 is 0.1mm and the simulation comparison diagram of Pr:YLF emission spectra.As seen from Figure 2, the strongest in the transmissivity of the glass flake at 604.2nm place, the most weak in the transmissivity at 607.2nm and 639.5nm place, therefore use this glass flake can well suppress 607nm to obtain the output of 604nm.
Referring to Fig. 3, Fig. 3 is the laser light spectrogram that the 604nm orange light all solid laser output of praseodymium lithium yttrium fluoride is mixed in blue light pumping, and centre wavelength is 604.2nm.
Referring to Fig. 4, Fig. 4 is the 604nm orange light all solid laser input-output characteristic curve that praseodymium lithium yttrium fluoride is mixed in the pumping of embodiment of the present invention blue light.Output is coupled as T=3.38%, threshold value Pth=318mW, power output Pmax=60.6mW.
Claims (4)
1. the 604nm orange light all solid laser of praseodymium lithium yttrium fluoride is mixed in blue light pumping, it is characterized in that being provided with:
444nm blue-light semiconductor laser, as the pumping source of 604nm orange light all solid laser;
Shaping prism, shaping prism is positioned at the output of 444nm blue-light semiconductor laser, and shaping prism is triangle and is coated with blue light anti-reflection film system;
Condenser lens, condenser lens is located at the output of shaping prism;
Plane input mirror, plane input mirror is positioned at the output of condenser lens, as the input mirror of 604nm orange light all solid laser;
Pr:YLF laser crystal, the input end face of Pr:YLF laser crystal is close to plane input mirror;
Glass flake, glass flake is located at the output of Pr:YLF laser crystal, and the thickness of glass flake is 0.1mm;
Laser output mirror, laser output mirror is located at the output of glass flake, as the outgoing mirror of 604nm orange light all solid laser;
Blue filter, blue filter is located at the output of laser output mirror, for filtering the 444nm pump light not being completely absorbed, thereby makes to be output as the orange laser of the mono-wavelength of 604nm.
2. the 604nm orange light all solid laser of praseodymium lithium yttrium fluoride is mixed in blue light pumping as claimed in claim 1, it is characterized in that: the plated film rete of described plane input mirror is for thoroughly high at 444nm place, simultaneously thoroughly high at 640nm place, at 607nm, 604nm place height instead, i.e. the multilayer dielectric film of reflectivity R>99.5%.
3. the 604nm orange light all solid laser of praseodymium lithium yttrium fluoride is mixed in blue light pumping as claimed in claim 1, it is characterized in that: the plated film rete of described laser output mirror is in 607nm, the part transmission of 604nm place, i.e. the multilayer dielectric film of transmissivity T<10%.
4. the 604nm orange light all solid laser of praseodymium lithium yttrium fluoride is mixed in blue light pumping as claimed in claim 1, it is characterized in that, described glass flake has etalon effect: if insert in resonant cavity with Brewster's angle, strengthen the loss of the 607nm laser of π direction polarization, make the threshold value of 604nm laser of σ direction polarization lower than the 607nm laser threshold on π polarization direction, make the preferential starting of oscillation of 604nm laser; Separately the 607nm laser of π direction polarization with keen competition and the 604nm laser of σ direction polarization are separated, thereby sharp the penetrating of 607nm restrained, obtain the sharp of 604nm and penetrate.
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|---|---|---|---|
| CN201410376433.7A CN104092094A (en) | 2014-08-01 | 2014-08-01 | 604nm orange light full-solid laser device for blue light pumping praseodymium-doped yttrium lithium fluoride |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071214A (en) * | 2015-09-22 | 2015-11-18 | 山东大学 | Method for producing deep ultraviolet laser light through visible laser direct frequency conversion and all-solid-state deep ultraviolet laser |
| CN105762639A (en) * | 2016-05-11 | 2016-07-13 | 哈尔滨医科大学 | High cutting laser |
-
2014
- 2014-08-01 CN CN201410376433.7A patent/CN104092094A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| B. XU ET AL: ""Highly efficient InGaN-LD-pumped bulk Pr:YLF orange laser at 607nm"", 《OPTICS COMMUNICATIONS》 * |
| Y. P. HUANG ET AL.: ""Orthogonally polarized dual-wavelength Nd:LuVO4 laser at 1086 nm and 1089 nm"", 《OPTICS EXPRESS》 * |
| 闫宇 等: ""蓝光抽运掺镨氟化钇锂橙光激光器"", 《中国激光》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071214A (en) * | 2015-09-22 | 2015-11-18 | 山东大学 | Method for producing deep ultraviolet laser light through visible laser direct frequency conversion and all-solid-state deep ultraviolet laser |
| CN105762639A (en) * | 2016-05-11 | 2016-07-13 | 哈尔滨医科大学 | High cutting laser |
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Application publication date: 20141008 |