CN103779770A - Blue-light LD pimping praseodymium-doped yttrium lithium fluoride 915 nm near-infrared total-solid laser device - Google Patents
Blue-light LD pimping praseodymium-doped yttrium lithium fluoride 915 nm near-infrared total-solid laser device Download PDFInfo
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- CN103779770A CN103779770A CN201410045538.4A CN201410045538A CN103779770A CN 103779770 A CN103779770 A CN 103779770A CN 201410045538 A CN201410045538 A CN 201410045538A CN 103779770 A CN103779770 A CN 103779770A
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Abstract
The invention relates to total-solid laser devices, in particular to a blue-light LD pimping praseodymium-doped (Pr-doped) yttrium lithium fluoride (YLF) 915 nm near-infrared total-solid laser device. The near-infrared total-solid laser device is provided with a 444 nm blue-light semiconductor laser device, a shaping prism, a focusing lens, a planar input mirror, a Pr :YLF laser crystal, a laser output mirror and a blue-light optical filter. The shaping prism is located at the output end of the 444 nm blue-light semiconductor laser device; the focusing lens is arranged at the output end of the shaping prism and performs shaping and focusing on pumping light beams together with the shaping prism; the planar input mirror is arranged at the output end of the focusing lens, and the planar input mirror is plated with a 444 nm high-transmittance 915 nm high-reflection multi-layer dielectric film; the input end face of the Pr :YLF laser crystal is next to the planar input mirror; the laser output mirror is arranged at the output end of the Pr :YLF laser crystal, and a multi-layer dielectric film with 915 nm partial transmission and high transmission in a visible light wave band is adopted for the Pr :YLF laser crystal; the blue-light optical filter is arranged at the output end of the laser output mirror. Strong laser lines of the visible light wave band are effectively suppressed.
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 915nm near-infrared all solid laser of praseodymium lithium yttrium fluoride (Pr:YLF).
Background technology
The visible ray solid state laser of mixing praseodymium (Pr) material is the focus in Laser Study field in recent years, Pr:YLF laser crystal can produce the Laser emission spectral line of multiple wavelength such as 522nm, 607nm, 640nm, 698nm, 721nm, 915nm, wherein the laser gain of 640nm and 721nm strong (referring to document Teoman G ü n et al., " Power scaling of laser diode pumped Pr
3+: LiYF
4cw lasers:efficient laser operation at522.6nm, 545.9nm, 607.2nm, and639.5nm ", Optics Letters36,1002 (2011); T.Sandrock et al., " Efficient continuous wave-laser emission of Pr
3+-doped fluorides at room temperature ", Appl.Phys.B58,149-151 (1994)).
Summary of the invention
The object of the invention is to, for the deficiency that not yet obtains at present the Pr:YLF all solid laser of the new wavelength of 915nm, provides a kind of blue light LD pumping to mix praseodymium lithium yttrium fluoride 915nm near-infrared all solid laser.
The present invention is provided with:
444nm blue-light semiconductor laser (LD), described 444nm blue-light semiconductor laser (LD) is as the pumping source of 915nm near-infrared all solid laser;
Shaping prism, described shaping prism is positioned at the output of 444nm blue-light semiconductor laser, for realizing the shaping of pump light hot spot, makes the pump spot of strip be shaped as approaching square;
Condenser lens, described condenser lens is located at the output of shaping prism, for realizing the focusing of pump beam after shaping;
Plane input mirror, described plane input mirror is located at the output of condenser lens, as the near infrared laserresonator input of 915nm mirror.By special film system design, effectively suppress the laser generation of visible light wave range;
Pr:YLF laser crystal, the input end face of described Pr:YLF laser crystal is close to plane input mirror, as the gain media of 915nm laser;
Laser output mirror, described laser output mirror is located at the output of Pr:YLF laser crystal, as the outgoing mirror of 915nm near-infrared laser; Described laser output mirror is plano-concave mirror, and concave curvature radius is 100mm;
Blue filter, described 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 mono-wavelength near-infrared laser of 915nm.
The present invention utilizes special chamber mirror film system, adopts diode-end-pumped Pr:YLF to realize the continuous operation of new wavelength 915nm near-infrared laser, and this expands application by the Pr:YLF laser near infrared band and brings important academic significance and use value.Outstanding effect of the present invention will present in embodiment.The present invention adopts the laserresonator chamber mirror film system design of particular design, effectively suppresses the stronger laser line of visible light wave range, for the generation of near-infrared laser provides new method and approach, has important learning value and application prospect.
Accompanying drawing explanation
Fig. 1 is the structure composition schematic diagram of the embodiment of the present invention.
Fig. 2 is the energy level transition figure that mixes praseodymium lithium yttrium fluoride.
Fig. 3 is that the 915nm near-infrared all solid laser power output of praseodymium lithium yttrium fluoride and the relation curve of pump absorption power are mixed in the pumping of embodiment of the present invention blue light.Wherein abscissa is absorption of crystal power, and unit is mW, and ordinate is power output, and unit is mW.T is the output coupled transmittance of laser output mirror at 915nm place, and η is the oblique efficiency of 915nm near-infrared laser, the data point recording in figure mid point representative experiment, and the straight line that solid black lines is matching, its slope represents the oblique efficiency of laser.
Fig. 4 is the laser light spectrogram that the 915nm ruddiness all solid laser of praseodymium lithium yttrium fluoride is mixed in the pumping of embodiment of the present invention blue light.Wherein abscissa is wavelength, and unit is nm, and ordinate is intensity.
Embodiment
The invention will be further described in connection with accompanying drawing for following examples.
As shown in Figure 1, the embodiment of the present invention is provided with: 444nm blue-light semiconductor laser 1, shaping prism 2, condenser lens 3, plane input mirror 4, Pr:YLF laser crystal 5, laser output mirror 6, blue filter 7.
Described 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, adopts the multilayer dielectric film of plating 444nm high (T>90%) thoroughly, 915nm high anti-(R>99%), as the input mirror of laser; Pr:YLF laser crystal 5, crystal doping concentration is 0.2a.t.%, and length is 8mm, and its input end face is plane input mirror 4 and then.Described laser output mirror 6 is located at the output of Pr:YLF crystal 5, adopts the multilayer dielectric film of the transmission of 915nm part, visible light wave range high transmission, has suppressed the laser generation of visible light wave range, and as the outgoing mirror of 915nm near-infrared laser.Blue filter 7 is located at the output of laser output mirror 6, for filtering the 444nm pump light not being completely absorbed, thereby makes to be output as the mono-wavelength near-infrared laser of 915nm.
The concrete plated film index of laserresonator chamber mirror is as follows:
Plane input mirror adopts plating 444nm height thoroughly and the multilayer dielectric film of 915nm high anti-(R>99%), as pump light input mirror.Laser output mirror adopts the multilayer dielectric film of plating 915nm part transmission (transmissivity is T=1.8%), as the outgoing mirror of 915nm ruddiness.
In the design process of laser, in order to make pump light emission spectra and Pr:YLF laser crystal absorption spectra realize optimum Match, improve the absorption efficiency of pump light, therefore adopt 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.
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%) of 915nm of 444nm, laser output mirror adopts the multilayer dielectric film of 915nm part transmission (transmissivity is T=1.8%), the transmissivity of visible light wave range input mirror and outgoing mirror is all greater than 50%, make the loss ratio 915nm place at visible light wave range place much larger, cause their laser starting of oscillation threshold value larger than 915nm, thereby effectively suppressed the laser generation of visible light wave range spectral line.The present invention inputs the special plated film rete design of mirror and laser output mirror by plane, suppressed the more laser generation of intense line of visible light wave range, 915nm can be vibrated in resonant cavity and form continuous laser 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.
Fig. 2 provides the energy level transition figure that mixes praseodymium lithium yttrium fluoride.
Fig. 3 provides blue light pumping and mixes the power output of 915nm near-infrared all solid laser and the relation curve of pump absorption power of praseodymium lithium yttrium fluoride, wherein, and output coupled transmittance T=1.8%.As can be seen from Figure 3: the threshold value of this laser is higher, be 323.2mW, tiltedly efficiency is 14.9%, maximum Output of laser power reaches 39mW.
Fig. 4 provides blue light pumping and mixes the spectrogram of the 915nm near-infrared all solid laser of praseodymium lithium yttrium fluoride, and centre wavelength is 914.6nm, and live width is 1.8nm.
The present invention has realized 444nm blue-light semiconductor laser pumping and mixes praseodymium lithium yttrium fluoride (Pr:YLF) laser crystal and realize the continuous operation of 915nm laser with new wavelength first, increase a kind of Pr:YLF solid state laser of near infrared band, for bringing important academic significance and use value in enlarged proximal infrared application field.In addition, to mix the concrete implementation result of the 915nm near-infrared all solid laser of praseodymium lithium yttrium fluoride be significant, reproducible in blue light pumping.
Claims (6)
1. praseodymium lithium yttrium fluoride 915nm near-infrared all solid laser is mixed in blue light LD pumping, it is characterized in that being provided with:
444nm blue-light semiconductor laser, described 444nm blue-light semiconductor laser is as the pumping source of 915nm near-infrared all solid laser;
Shaping prism, described shaping prism is positioned at the output of 444nm blue-light semiconductor laser, for realizing the shaping of pump light hot spot, makes the pump spot of strip be shaped as approaching square;
Condenser lens, described condenser lens is located at the output of shaping prism, for realizing the focusing of pump beam after shaping;
Plane input mirror, described plane input mirror is located at the output of condenser lens, as the near infrared laserresonator input of 915nm mirror;
Pr:YLF laser crystal, the input end face of described Pr:YLF laser crystal is close to plane input mirror, as the gain media of 915nm laser;
Laser output mirror, described laser output mirror is located at the output of Pr:YLF laser crystal, as the outgoing mirror of 915nm near-infrared laser;
Blue filter, described 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 mono-wavelength near-infrared laser of 915nm.
2. praseodymium lithium yttrium fluoride 915nm near-infrared all solid laser is mixed in blue light LD pumping as claimed in claim 1, it is characterized in that described laser output mirror is plano-concave mirror.
3. praseodymium lithium yttrium fluoride 915nm near-infrared all solid laser is mixed in blue light LD pumping as claimed in claim 2, and the concave curvature radius that it is characterized in that described plano-concave mirror is 100mm.
4. praseodymium lithium yttrium fluoride 915nm near-infrared all solid laser is mixed in blue light LD pumping as claimed in claim 1, it is characterized in that described plane input mirror adopts the multilayer dielectric film of plating 444nm high (T>90%) thoroughly, 915nm high anti-(R>99%), the T>90% that described height is saturating, the R>99% that described height is anti-.
5. praseodymium lithium yttrium fluoride 915nm near-infrared all solid laser is mixed in blue light LD pumping as claimed in claim 1, and the crystal doping concentration that it is characterized in that described Pr:YLF laser crystal is 0.2a.t.%, and length is 8mm.
6. praseodymium lithium yttrium fluoride 915nm near-infrared all solid laser is mixed in blue light LD pumping as claimed in claim 1, it is characterized in that described laser output mirror adopts the multilayer dielectric film of the transmission of 915nm part, visible light wave range high transmission.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124608A (en) * | 2014-08-01 | 2014-10-29 | 厦门大学 | Blu-ray-pumped praseodymium-doped yttrium lithium fluoride all-solid-state 670nm red laser |
| CN105762639A (en) * | 2016-05-11 | 2016-07-13 | 哈尔滨医科大学 | High cutting laser |
| CN114447758A (en) * | 2022-01-11 | 2022-05-06 | 厦门大学 | All-solid-state praseodymium-doped annular cavity single-frequency laser device |
Citations (4)
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| US5805631A (en) * | 1994-09-08 | 1998-09-08 | The Regents Of The University Of California | Blue, green, orange, and red upconversion laser |
| JP2010141283A (en) * | 2008-07-08 | 2010-06-24 | Central Glass Co Ltd | Wide-band wavelength-variable laser device |
| CN102832535A (en) * | 2012-09-21 | 2012-12-19 | 厦门大学 | Solid-state 698nm deep red laser device with blue laser light-emitting diode (LED) pump |
| CN103117509A (en) * | 2013-03-08 | 2013-05-22 | 厦门大学 | 696nm red light total-solid laser of Blu-ray pump praseodymium-doped yttrium lithium fluoride |
-
2014
- 2014-02-08 CN CN201410045538.4A patent/CN103779770A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5805631A (en) * | 1994-09-08 | 1998-09-08 | The Regents Of The University Of California | Blue, green, orange, and red upconversion laser |
| JP2010141283A (en) * | 2008-07-08 | 2010-06-24 | Central Glass Co Ltd | Wide-band wavelength-variable laser device |
| CN102832535A (en) * | 2012-09-21 | 2012-12-19 | 厦门大学 | Solid-state 698nm deep red laser device with blue laser light-emitting diode (LED) pump |
| CN103117509A (en) * | 2013-03-08 | 2013-05-22 | 厦门大学 | 696nm red light total-solid laser of Blu-ray pump praseodymium-doped yttrium lithium fluoride |
Non-Patent Citations (1)
| Title |
|---|
| B. XU: "Highly efficient InGaN-LD-pumped bulk Pr:YLF orange laser at 607 nm", 《OPTICS COMMUNICATION》, vol. 305, 18 May 2013 (2013-05-18), pages 96 - 99 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124608A (en) * | 2014-08-01 | 2014-10-29 | 厦门大学 | Blu-ray-pumped praseodymium-doped yttrium lithium fluoride all-solid-state 670nm red laser |
| CN105762639A (en) * | 2016-05-11 | 2016-07-13 | 哈尔滨医科大学 | High cutting laser |
| CN114447758A (en) * | 2022-01-11 | 2022-05-06 | 厦门大学 | All-solid-state praseodymium-doped annular cavity single-frequency laser device |
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Application publication date: 20140507 |