CN100365887C - Separation type Raman laser in full solid state - Google Patents
Separation type Raman laser in full solid state Download PDFInfo
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- CN100365887C CN100365887C CNB2005100945134A CN200510094513A CN100365887C CN 100365887 C CN100365887 C CN 100365887C CN B2005100945134 A CNB2005100945134 A CN B2005100945134A CN 200510094513 A CN200510094513 A CN 200510094513A CN 100365887 C CN100365887 C CN 100365887C
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Abstract
The present invention provides a full solid-state Raman laser device with a simple and compact structure, which comprises a pumping system of a diode laser end surface, a laser cavity composed of a laser input cavity mirror and an output cavity mirror with plated films, wherein an independent laser gain crystal, a Raman frequency shift crystal and a laser Q-switching device are placed inside the laser cavity, and Raman laser output is obtained inside a quasi-continuously operating laser device. A laser gain medium is an Nd: YVO< 4 > crystal and is doped with an Nd< 3+ > laser crystal or is doped with laser crystals of Yb< 3+ >: YAG, etc. so as to generate laser oscillation adjacent to the wave length of 1.34 micrometres or 1.06 micrometres. The Raman frequency shift crystal is a piece of single crystal so as to be used as a Raman active medium. The Raman frequency shift crystal is an undoped YVO< 4 > crystal, etc. The present invention adopts a divided type design and overcomes the problem that the further increase of a laser output power and beam quality is severely limited by a thermal effect when one piece of crystal is simultaneously used as the laser gain medium and the Raman frequency shift crystal.
Description
Technical field
The present invention relates to laser, relate in particular to a kind of separation type Raman laser in full solid state.
Background technology
People such as nineteen ninety-five Arizona, USA university optical research center J.T.Murray obtain the solid Roman laser near diffraction limit, utilize the solid state laser of flash lamp pumping to make pumping source, come pumping Raman active crystal Ba (NO
3)
2, obtain the raman laser of repetition rate 100Hz, wavelength 1.56 μ m.Though wavelength is started late at the eye-safe solid Roman laser of 1.5x μ m, but bigger advantage is arranged owing to compare with other eye-safe laser on high-power, high repetition frequency and beam quality, along with the maturation of solid Roman medium growing technology with provide, human eye safe Raman laser has more development prospect, its future thrust is to combine with the solid state laser technology of diode pumping, give full play to intrinsic advantage and develop, to satisfy the needs of eye-safe laser apparatus to the direction of high efficiency, high brightness, high power, high repetition frequency.
In September, 1999, the " Ba (NO of end pumping that on Appl.Phys.B, publishes an article such as J.Findeisen
3)
2Raman laser and NaBrO
3Raman laser (Diode-pumped Ba (NO
3)
2And NaBrO
3Ramanlasers) ", obtain the raman laser of 1197nm and 1163nm wavelength.
In October, 1999, A.S.Grabtchikov etc. publish an article on Appl.Phys.Lett. " all solid state Raman laser (All solid-state diode-pumped Raman laserwith self-frequency conversion) of changing certainly of diode laser end pumping ", utilize Nd
3+: KGd (WO
4)
2Be converted to the laser output of 1181nm wavelength from frequency.
The A.A.Kaminskii of calendar year 2001 Russia crystal research institute etc. has discovered two kinds of new Raman frequency displacement crystal YVO
4And GdVO
4Crystal, this provides more choices for the acquisition approach of eye-safe solid Raman laser.
In February calendar year 2001, " the passive Q-adjusted Nd of semiconductor laser pumping publishes an article on the Opt.Commun. such as Weibiao Chen
3+: PbWO
4From conversion Raman laser (Diode-pumped self-stimulating passivelyQ-switched Nd
3+: PbWO
4Raman laser) ", utilize Nd
3+: PbWO
4The Raman frequency shift of crystal self obtains the laser output of 1170nm wavelength.
In May, 2002, " eye-safe Ba (the NO of 20Hz running that on Appl.Phys.B, publishes an article such as N.TAKEI
3)
2Crystal cascade Raman laser (20-Hz operaion ofan eye-safe cascade Raman laserwith a Ba (NO
3)
2Crystal) ", utilize 1064nm to transfer the Nd:YAG laser pumping Ba (NO of Q
3)
2Crystal has obtained the laser output of eye-safe wavelength 1598nm through three rank Raman frequency shifts, but because the thermal effect that the low order Raman frequency shift causes is very strong, has made laser output energy level be subjected to great restriction.
In October, 2002, " the Efficientdiode-pumped passively Q-switched laser operation around 1900nm andself-frequency Raman conversion of Tm-doped KY (WO that on Appl.Phys.Lett., publishes an article such as L.E.Batay
4)
2", utilize Tm:KY (WO
4)
2Near the 1900nm of crystal Raman frequency shift obtains the laser of 2365nm wavelength.
In December, 2003, " (the Efficient1181nm self-stimulating Raman output from transversely diode-pumpedNd that on Opt.Commun., publish an article such as Takashige Omatsu
3+: KGd (WO
4)
2Laser) ", utilize Nd
3+: KGd (WO
4)
2The Raman frequency shift of crystal self obtains the raman laser output that 1067nm obtains 1181nm.
2004, Y.F.Chen reported at acousto-optic and has initiatively transferred in the laser of Q, utilized Nd:YVO
4(or Nd:GdVO
4) the Raman frequency displacement of laser gain crystal self, obtain the Raman laser output of human eye safe waveband (1.52 μ m).Because Nd:YVO
4(or Nd:GdVO
4) crystal is simultaneously as gain medium and Raman frequency shift crystal, thermal lensing effect has seriously limited laser output power level and beam quality.
In February, 2004, Chinese patent discloses CN1476131A number " multi-wavelength harmonic solid Raman laser " patent application, this utility model patent relates to the stimulated Raman scattering characteristic of gas and the humorous wave technology combination of Solid State Laser, realizes the output of single wavelength or multi-wavelength.
In June, 2005, Chinese patent discloses CN1624992A number " self-excited solid laman laser " patent application, and this patent relates to same crystal both to have been done gain medium and do the Raman frequency shift medium, obtained raman laser output.It comprises the laser input cavity sheet of laser pumping system, plated film and the laser cavity that the output cavity sheet constitutes, and places self-stimulated Raman crystal and laser Q-switching device in laser cavity.Device of the present invention has been expanded the laser wavelength range that present conventional solid state laser can reach.
The full-solid state Raman laser of the semiconductor laser end pumping in research in sum, technological approaches and the patent of invention all is to use crystal simultaneously as gain medium with from the Raman frequency shift crystal.Because thermal effect has seriously limited the further raising of laser output power and beam quality,, the split-type design scheme is proposed so we improve this.
Summary of the invention
The purpose of this invention is to provide a kind of full-solid state Raman laser simple and compact for structure, employing separates laser crystal with the Raman active medium technology path, overcome the restriction of thermal effect to laser output power and beam quality, thus the raman laser output of implementation efficiency height, the simpler compactness of structure, good beam quality, human eye safe waveband that peak power is high.
Purpose of the present invention realizes by following technical measures: separation type Raman laser in full solid state, comprise the laser input cavity mirror of diode laser end pumping system, plated film and the laser cavity that the output cavity mirror constitutes, in laser cavity, place independently laser gain crystal, Raman frequency shift crystal and laser Q-switching device, in the laser of quasi continuous operation, obtain raman laser output.Gain medium is Nd:YVO
4Crystal also comprises doping Nd
3+Laser crystal (as Nd:YAP, Nd:YAG, Nd:GdVO
4, Nd:GdYVO
4Deng) and other rare earth ion that mixes (as Yb
3+: YAG, Pr
3+: YVO
4Deng) laser crystal produce 1342nm or 1064nm laser generation.Use an independent crystal as the Raman active medium, realize frequency inverted, as undoped YVO
4Crystal, also comprise use other crystal with Raman active (as YAP, YAG, GdVO
4, PbWO
4, SrWO
4, GdYVO
4, CuAlS
2, NaClO
3Deng) realization single order Raman frequency shift.
The present invention improves: be provided with a chamber mirror between above-mentioned input cavity mirror and output cavity mirror, a is high saturating in the face of fundamental frequency light, and b is high saturating and high anti-to Raman frequency shift light in the face of fundamental frequency light, is equipped with the gain media that independent crystal is a laser between input cavity mirror and the chamber mirror; An acousto-optic Q-switch is provided with the Raman active medium that an independent crystal produces Raman frequency shift between output cavity mirror and the chamber mirror; The gain media of diode-pumped nd yag laser is to produce fundamental frequency light on the crystal, is that crystal produces Raman frequency shift by the Raman active medium again, and the resonant cavity of Raman frequency shift light is nested in the fundamental frequency optical cavity, obtains final raman laser output through the output cavity mirror.
Another separation type Raman laser in full solid state is, at the diode laser that is used for end face or profile pump, and gain media and an acousto-optic Q-switch that to be provided with an independent crystal between defeated people chamber mirror and the refrative cavity mirror be laser; The refrative cavity mirror is high anti-to fundamental frequency light and Raman frequency shift light; Be equipped with an independent crystal that produces Raman frequency shift between refrative cavity mirror and an output cavity mirror; Refrative cavity mirror and input cavity mirror, outgoing mirror constitute the three mirror cavity refrative cavity.
The present invention uses split-type design, and the laser gain crystal is separated with the Raman active medium, has overcome adverse effect that thermal lensing effect caused and restriction, comprises two mirrors and three mirror line chambers and refrative cavity structure.Can adopt similar cavity configuration that wavelength is realized the single order Raman frequency shift at the laser of 1342nm or 1064nm.
This all solid state laser is done pumping source with semiconductor laser, adopts the technology path with laser crystal and Raman active crystal separation, as utilizes Nd
3+: YVO
4Crystal is used undoped YVO as gain medium
4Crystal is as the Raman active medium.
The present invention can adopt the Nd that mixes of different substrates
3+Laser crystal (or the different rare earth ion that mixes), dissimilar Q-switch element (acousto-optic, electric light and saturable absorber etc.), design and select for use suitable Raman active crystal, first-harmonic is carried out frequency translation, obtain raman laser output efficient, high-quality.The present invention has very high using value in fields such as military affairs, medical treatment, meteorology, maritime affairs, aviation and scientific researches.
Characteristics of the present invention are:
Solid Roman laser small-sized, efficient, stable, long-lived, all solid state with it, start fast, high repetition frequency, numerous advantages such as portable and receive much concern in fields such as military affairs, medical science, meteorology, maritime affairs, aviations, has extraordinary application prospect, the invention provides a kind of small-sized full-solid state Raman laser and have the unexistent advantage of other lasers, can improve being applied to multiple occasion.
2. the split-type design that adopts of the present invention has overcome the restriction of thermal effect to power output and beam quality, can realize transformation efficiency height, good beam quality, the laser output that peak power is high.
3. the laser gain crystal Nd:YVO that example of the present invention adopts
4Have excellent laser activity, big as absorption coefficient, absorption band is wide, and stimulated emission cross section is big, is output as linearly polarized light etc.This crystal exists
4F
3/2→
4I
11/2With
4F
3/2→
4I
13/2Transition all have bigger emission cross section.The structural design that the present invention adopts is not only applicable to mix Nd
3+Laser crystal, and be applicable to much laser crystals of other doping, as long as the filming parameter of corresponding change pumping wavelength, chamber mirror just can be realized corresponding Raman frequency shift laser output.
4. the Raman frequency shift crystal YVO that example of the present invention adopts
4Have excellent laser activity, as simple Raman frequency shift medium, its gain height, loss is low, transformation efficiency height, and manufacture craft maturation, cost is lower, is desirable Raman active crystal.
The present invention can be used as a unit component, by selecting gain media and frequency displacement medium first-harmonic is carried out frequency inverted, just can obtain the raman laser output of other wavelength.In a word, the present invention is a full-solid state Raman laser simple and compact for structure, has overcome the restriction of thermal effect to laser output power and beam quality, good beam quality, peak power height, and raman laser output is in the scope of human eye safe waveband.
Description of drawings
Fig. 1 is a laser structure design diagram of the present invention
Fig. 2 is the another kind of laser structure design diagram of the present invention
Fig. 3 is another laser structure design diagram of the present invention
Fig. 4 is YVO of the present invention
4The Raman spectrogram of crystal
Fig. 5 obtains 1342nm fundamental frequency light and 1525nm Raman spectrogram for the present invention
Embodiment
The present invention is described further with reference to accompanying drawing:
The present invention can realize in the manner hereinafter described:
Full-solid state Raman laser provided by the present invention (Fig. 1), among Fig. 1: chamber mirror 1 is the input mirror of laser; The gain media 2 of laser; Raman active medium 5; Acousto-optic Q-switch 3; Chamber mirror 6 is the outgoing mirror of laser; The optical element and the material that use have: be used for the diode laser of side or end pumping, an input mirror (chamber mirror) 1; An independent crystal 2 is the gain media of laser; An independent crystal 5 produces the Raman active medium of Raman frequency shift; An acousto-optic Q-switch 3; An outgoing mirror (chamber mirror) 6.Laser diode-pumped gain medium is that crystal 2 produces fundamental frequency light, be that crystal 3 produces Raman frequency shift by the Raman active medium again, here be to use two mirror chambeies, fundamental frequency light and Raman frequency shift light vibrate in same resonant cavity, obtain final raman laser output by outgoing mirror 6.
The present invention can also realize in the manner hereinafter described:
Full-solid state Raman laser provided by the present invention (Fig. 2), chamber mirror 1 is the input mirror of laser; The gain media 2 of laser; Acousto-optic Q-switch 3; Chamber mirror 4; Raman active medium 5; Chamber mirror 6 is the outgoing mirror of laser; The optical element and the material that use have: be used for the diode laser of end face or profile pump, an input mirror (chamber mirror) 1; An independent crystal 2 is the gain media of laser; An acousto-optic Q-switch 3; A chamber mirror 4, a is high saturating in the face of fundamental frequency light, and b is high saturating and high anti-to Raman frequency shift light in the face of fundamental frequency light; An independent crystal 3 produces the Raman active medium of Raman frequency shift; An outgoing mirror.The gain media of diode-pumped nd yag laser is to produce fundamental frequency light on the crystal 2, be that crystal 5 produces Raman frequency shift by the Raman active medium again, here use three mirror cavity, the resonant cavity of Raman frequency shift light is nested in the fundamental frequency optical cavity, obtains final raman laser output through outgoing mirror (chamber mirror) 6.
The present invention can also realize in the manner hereinafter described:
Full-solid state Raman laser provided by the present invention (Fig. 3), chamber mirror 1 is the input mirror of laser; The gain media 2 of laser; Acousto-optic Q-switch 3; Refrative cavity mirror 7; Raman active medium 5; Chamber mirror 6 is the outgoing mirror of laser.
The optical element and the material that use have: be used for the diode laser of end face or profile pump, an input mirror (chamber mirror) 1; An independent crystal 2 is the gain media of laser; An acousto-optic Q-switch 3; A refrative cavity mirror 7, high anti-to fundamental frequency light and Raman frequency shift light; An independent crystal 5 produces the Raman active medium of Raman frequency shift; An outgoing mirror.The gain media of diode-pumped nd yag laser is to produce fundamental frequency light on the crystal 2, be that crystal 5 produces Raman frequency shift by the Raman active medium again, here use the three mirror cavity refrative cavity, can the hot spot on the Raman active medium that is to say to obtain higher power density to less.Obtain final raman laser output through outgoing mirror 6.
YVO
4The Raman spectrum of crystal is seen Fig. 4, the pumping source that uses in our experiment is the FAP system of Coherent company, output tail optical fiber core diameter is 800 μ m, is 808nm by 1: 1 coupled system from the centre wavelength of an end pumping laser crystal pumping light, and power output is adjustable between 1～30W; The acousto-optic crystal that adopts in our experiment is the LiNbO of cuboid
3Crystal, two sides all plate the high transmittance film to 1342nm, 1525nm wavelength, and repetition rate 1k to 40k is adjustable, radio frequency 28MH
z, acousto-optic crystal length 3cm.Test used YVO
4Shown in Raman spectrum Fig. 4 of crystal.
Make a full-solid state Raman laser simple and compact for structure according to Fig. 1.The diode laser that is used for side or end pumping, a radius of curvature 600mm, high saturating to 808nm wavelength pump light, to 1342nm and the high anti-chamber mirror 1 of 1525nm wavelength laser, this is an input mirror; Nd
3+: YVO
4Crystal 2 is a gain medium; Undoped YVO
4Crystal 5 is the Raman frequency shift medium; Acousto-optic Q-switch 3 is used for realizing quasi continuous operation; A flat mirror (chamber mirror), high anti-to the 1342nm wavelength laser, to the transmission of 1525nm wavelength laser part, be the outgoing mirror of laser.The laser diode-pumped Nd of 808nm
3+: YVO
4Crystal 2 produces the laser of 1342nm wavelength, again by undoped YVO
4Crystal 5 produces Raman frequency shift and is transformed into the raman laser of 1525nm wavelength from 1342nm fundamental frequency light, is to use two mirror chambeies here, and 1342nm and 1525nm obtain in same resonant cavity, are obtained the 1525nm laser output of eye-safe by outgoing mirror.The raman laser spectrum that produces as shown in Figure 5.
Make a full-solid state Raman laser simple and compact for structure according to Fig. 2.The diode laser that is used for profile pump, a radius of curvature 600mm, high saturating to 808nm wavelength pump light, to the high anti-chamber mirror 1 of 1342nm wavelength laser, this is an input mirror; Nd
3+: YVO
4Crystal 2 is a gain medium; Undoped YVO
4Crystal 3 is the Raman frequency shift medium; Acousto-optic Q-switch 4 is used for realizing quasi continuous operation; A flat mirror (chamber mirror), a is high saturating in the face of 1342nm fundamental frequency light, and b is high saturating, high anti-to the 1525nm raman laser in the face of 1342nm fundamental frequency light; Undoped YVO
4Crystal is the Raman frequency shift medium; A flat mirror (chamber mirror), high anti-to the 1342nm wavelength laser, to the transmission of 1525nm wavelength laser part, be the outgoing mirror of laser.The laser diode-pumped Nd of 808nm
3+: YVO
4Crystal produces the laser of 1342nm wavelength, again by undoped YVO
4Crystal 5 produces Raman frequency shift, be transformed into the raman laser of 1525nm wavelength from 1342nm fundamental frequency light, here use three mirror cavity, the 1525nm resonant cavity is nested in ( chamber mirror 1 and 6 formation 1342nm fundamental frequency optical cavities in the 1342nm resonant cavity, chamber mirror 4 and 6 constitutes 1525nm raman laser chamber), obtain the 1525nm laser output of eye-safe through outgoing mirror 6.
Make the full-solid state Raman laser of one three mirror refrative cavity according to Fig. 3.The diode laser that is used for side or end pumping, a radius of curvature 600mm, high saturating to 808nm wavelength pump light, to 1342nm and the high anti-chamber mirror 1 of 1525nm wavelength laser, this is an input mirror; Nd
3+: YVO
4Crystal 2 is a gain medium; Undoped YVO
4Crystal is the Raman frequency shift medium; Acousto-optic Q-switch is used for realizing quasi continuous operation; A plano-concave mirror, high anti-to 1342nm fundamental frequency light and 1525nm raman laser; Undoped YVO
4Crystal 5 is the Raman frequency shift medium; A flat mirror (chamber mirror), high anti-to the 1342nm wavelength laser, to the transmission of 1525nm wavelength laser part, be the outgoing mirror of laser.The laser diode-pumped Nd of 808nm
3+: YVO
4Crystal 2 produces the laser of 1342nm wavelength, again by undoped YVO
4Crystal 5 produces Raman frequency shift and is transformed into the raman laser of 1525nm wavelength from 1342nm fundamental frequency light, uses three mirror refrative cavities (being in order to obtain higher power density on the Raman active crystal) to obtain the 1525nm laser output of eye-safes through outgoing mirror 6 here.
Make a split type full-solid state Raman laser according to Fig. 1 (or Fig. 2 or Fig. 3).Different with previous examples is, an end face of laser crystal 2 is as input mirror, and this end face is that 808nm is high saturating, and 1.06 μ m～1.53 μ m are all-trans, and obtain split type full-solid state Raman laser.
Make a split type full-solid state Raman laser according to Fig. 1 (or Fig. 2 or Fig. 3).Different with previous examples 1 (or 2 or 3) is that the Q-switch is selected electric light Q-switch or saturable absorber for use, obtains split type full-solid state Raman laser.
Make a split type full-solid state Raman laser according to Fig. 1 (or Fig. 2 or Fig. 3).With different in the example 1,2,3,4,5 be to use the other Nd that mixes
3+Laser crystal as (as Nd:YAP, Nd:YAG, Nd:GdVO
4, Nd:GdYVO
4, Nd:YAlO
3Deng) or other rare earth ion that mixes (as Yb
3+: YAG, Pr
3+: YVO
4Deng) laser crystal, obtain split type full-solid state Raman laser.
Make a split type full-solid state Raman laser according to Fig. 1 (or Fig. 2 or Fig. 3).With different in the example 1,2,3,4,5,6 be, other have Raman active crystal (as YAP, YAG, GdVO
4, PbWO
4, SrWO
4, GdYVO
4, CuAlS
2, NaClO
3Deng) realization single order Raman frequency shift.Obtain split type full-solid state Raman laser.
Claims (1)
1. separation type Raman laser in full solid state, comprise the laser input cavity mirror (1) of diode laser end pumping system, plated film and the laser cavity that output cavity mirror (6) constitutes, in laser cavity, place independently laser gain crystal (2), Raman frequency shift crystal (5) and acousto-optic Q-switch (3), in the laser of quasi continuous operation, obtain raman laser output; It is characterized in that described laser gain crystal is Nd:YVO
4Crystal, Yb
3+: YAG or Pr
3+: YVO
4Laser crystal, laser crystal produces near the laser generation 1.34 μ m or 1.06 mum wavelengths; Described Raman frequency shift crystal be an independent crystal as the Raman active medium, described Raman frequency shift crystal is undoped YVO
4Crystal is realized the single order Raman frequency shift; In diode laser end pumping system, be provided with a refrative cavity mirror, be provided with a laser gain crystal (2) and an acousto-optic Q modulation switch (3) between input cavity mirror (1) and the refrative cavity mirror (7); Refrative cavity mirror (7) is high anti-to fundamental frequency light and Raman frequency shift light; Be equipped with a Raman frequency shift crystal (5) between refrative cavity mirror (7) and the output cavity mirror (6); Refrative cavity mirror and input cavity mirror, output cavity mirror (6) constitute the three mirror cavity refrative cavity.
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|---|---|---|---|
| CNB2005100945134A CN100365887C (en) | 2005-09-23 | 2005-09-23 | Separation type Raman laser in full solid state |
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|---|---|---|---|
| CNB2005100945134A CN100365887C (en) | 2005-09-23 | 2005-09-23 | Separation type Raman laser in full solid state |
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|---|---|
| CN1761111A CN1761111A (en) | 2006-04-19 |
| CN100365887C true CN100365887C (en) | 2008-01-30 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761051A (en) * | 2011-04-28 | 2012-10-31 | 山东大学 | Small continuous wave safety raman laser for human eye |
| CN103872576B (en) * | 2012-12-10 | 2017-03-08 | 中国科学院大连化学物理研究所 | The closely homocentric stable cavity gas Raman laser instrument of one kind |
| CN103872575A (en) * | 2012-12-10 | 2014-06-18 | 中国科学院大连化学物理研究所 | Confocal unsteady cavity gas Raman laser of YAG pump |
| CN103928838A (en) * | 2014-04-21 | 2014-07-16 | 中国科学院上海光学精密机械研究所 | 1216-nm all-solid Raman laser |
| CN105140775A (en) * | 2015-07-16 | 2015-12-09 | 山东大学 | 1.2 micron wavelength all-solid-state Raman laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214068U (en) * | 1987-10-10 | 1988-09-07 | 清华大学 | Miniature internal chamber raman frequency-shift laser |
| CN2104516U (en) * | 1991-08-29 | 1992-05-13 | 清华大学 | Small low-divergence factor raman shift frequency laser |
| US5251221A (en) * | 1992-08-10 | 1993-10-05 | Hughes Aircraft Company | Self aligning intracavity Raman laser |
| US5566195A (en) * | 1994-07-02 | 1996-10-15 | Carl-Zeiss-Stiftung | Intracavity raman laser |
-
2005
- 2005-09-23 CN CNB2005100945134A patent/CN100365887C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214068U (en) * | 1987-10-10 | 1988-09-07 | 清华大学 | Miniature internal chamber raman frequency-shift laser |
| CN2104516U (en) * | 1991-08-29 | 1992-05-13 | 清华大学 | Small low-divergence factor raman shift frequency laser |
| US5251221A (en) * | 1992-08-10 | 1993-10-05 | Hughes Aircraft Company | Self aligning intracavity Raman laser |
| US5566195A (en) * | 1994-07-02 | 1996-10-15 | Carl-Zeiss-Stiftung | Intracavity raman laser |
Non-Patent Citations (1)
| Title |
|---|
| 固体拉曼激光器. 陈慧挺等.激光与光电子学进展，第42卷第7期. 2005 * |
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