CN101950917A - All solid-state 455nm pulsed laser based on neodymium-doped fluorinated lutetium lithium crystal - Google Patents
All solid-state 455nm pulsed laser based on neodymium-doped fluorinated lutetium lithium crystal Download PDFInfo
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Abstract
The invention relates to an all solid-state 455nm pulsed laser based on a neodymium-doped fluorinated lutetium lithium crystal, which is suitable for underwater laser communications. The all solid-state 455 nm pulsed laser is characterized by comprising a laser diode output with tail fibers, and a pump optical coupling system, a laser cavity and a multiple frequency crystal are sequentially arranged along the advanced direction of the laser diode outputting a laser, wherein the laser cavity comprises an Nd: LiLuF crystal and an electrooptic Q-crystal. The invention has the characteristics of compact structure, small size, long life and stable working.
Description
Technical field
The present invention relates to all solid state laser, particularly a kind of all solid state 455nm pulse laser based on neodymium-doped lithium lutetium fluoride (being designated hereinafter simply as Nd:LiLuF) crystal
Background technology
Blue light wavelength is in the low loss window of seawater, and transmission has more low loss characteristic in off-lying sea and deep-sea, uses the important light source that reaches in the resource detection under water so the bluish-green laser device of 455nm has become the ocean.Can rely on atmosphere, air/seawater interface and seawater as the communication between optical channel realization and the deep water by the bluish-green laser signal; The bluish-green laser device also can be installed under water on the carrier, realizes undersea detection.
Will obtain the output of 455nm laser at present, be to adopt ti sapphire laser to obtain the output of 910nm laser mostly, utilize frequency-doubling method to realize afterwards, but this kind method structure is comparatively complicated, and efficient is not high.Utilize laser diode-pumped Nd-doped crystal to realize
4F
3/2→
4I
9/2Energy level transition, thereby the laser output of acquisition 910nm utilize frequency-doubled effect to obtain the effective ways that the 455nm blue light is a kind of 455nm of acquisition blue light output afterwards.
Because faint Stark energy level splitting and negative lens effect, Nd:LiLuF crystal can be used as the acquisition 910nm laser output of laser crystal efficient stable.2000, M.Schmidt et al. reported and adopted the Nd:LiLuF crystal to obtain the laser output of 910nm as laser crystal, but the tuning ti sapphire laser that had adopted 792nm at that time is as pumping source, and output light is continuous light, structure is comparatively complicated, is not suitable for subsurface communication.
Summary of the invention
The objective of the invention is to fill up above-mentioned blank, a kind of all solid state 455nm pulse laser based on neodymium-doped lithium lutetium fluoride (Nd:LiLuF) crystal that is applicable to underwater laser communication is provided, and this laser has compact conformation, volume is little, the life-span is long, the characteristics of working stability.
Technical solution of the present invention is as follows:
A kind of all solid state 455nm pulse laser based on the neodymium-doped lithium lutetium fluoride crystal, characteristics are that its formation comprises the laser diode of the fine output of magnetic tape trailer, set gradually the pump light coupled system, include the laserresonator and the frequency-doubling crystal of Nd:LiLuF crystal and electric-optically Q-switched crystal along the direction of advance of this laser diode output laser.
Described laserresonator is by a level crossing and the hemispherical cavity that the plano-concave mirror with certain curvature radius constitutes, and is provided with the Nd:LiLuF crystal of water-cooled temperature control and the lithium columbate crystal of the electric-optically Q-switched mode of employing in this laserresonator.
The laser diode of the fine output of described magnetic tape trailer is made of laser diode and tail optical fiber, and described pump light coupled system is made up of two identical convex lens of focal length.
Described frequency-doubling crystal is three lithium borates (LBO) crystal.
The 792nm continuous laser of the laser diode output of the fine output of described magnetic tape trailer enters the laserresonator that includes Nd:LiLuF crystal and electric-optically Q-switched crystal by the pump light coupled system, obtain the pulse laser output of 910nm, the pulse laser of this 910nm is by producing the pulse laser output of 455nm behind the frequency-doubling crystal.
The present invention has the following advantages:
1, adopt the Nd:LiLuF crystal as laser crystal, volume is little, compact conformation, and stable performance, easy to use.
2, owing to the negative lens effect of Nd:LiLuF crystal, the hemispherical cavity structure that laserresonator of the present invention is made up of level crossing peace concave mirror has reduced because the unsteadiness in the chamber that thermal lensing effect is brought is exported to guarantee the laser that obtains high stability.
3, adopt the laser diode pump-coupling of 792nm, laser diode-pumped than 808nm, the absorption efficiency of Nd:LiLuF crystal is higher, thereby guarantees to obtain high efficiency laser output.
4, adopt lithium niobate as electric-optically Q-switched crystal, half-wave voltage is lower, and is difficult for deliquescence, is fit to subsurface communication.
5, adopt three lithium borates (LBO) crystal as frequency-doubling crystal, the crystal acceptance angle is bigger, shg efficiency height, working stability.
Description of drawings
Fig. 1 is the structural representation of specific embodiment that the present invention is based on all solid state 455nm pulse laser of neodymium-doped lithium lutetium fluoride crystal
Embodiment
See also Fig. 1, Fig. 1 is the structural representation that the present invention is based on all solid state 455nm pulse laser embodiment of neodymium-doped lithium lutetium fluoride crystal.As seen from the figure, the present invention is based on all solid state 455nm pulse laser of neodymium-doped lithium lutetium fluoride crystal, its formation comprises the laser diode 1 of the fine output of magnetic tape trailer, and the direction of advance of exporting laser along this laser diode 1 sets gradually pump light coupled system 2, includes the laserresonator 3 and the frequency-doubling crystal 4 of Nd:LiLuF crystal and electric-optically Q-switched crystal
Described laserresonator 3 is hemispherical cavities that the plano-concave mirror 302 by a level crossing 301 and certain curvature radius constitutes, and has the Nd:LiLuF crystal 3 03 of water-cooled temperature control and adopt the lithium columbate crystal 304 of electric-optically Q-switched mode in described laserresonator 3.
The laser diode 1 of the fine output of described magnetic tape trailer is made of laser diode 101 and tail optical fiber 102, and described pump light coupled system 2 is made up of two identical convex lens of focal length.
The 792nm continuous laser of laser diode 1 output of the fine output of described magnetic tape trailer enters the laserresonator 3 that includes Nd:LiLuF crystal and electric-optically Q-switched crystal by pump light coupled system 2, obtain the pulse laser output of 910nm, the pulse laser of this 910nm produces the pulse laser output of 455nm by frequency-doubling crystal 4 backs.
In the present embodiment, described laserresonator 3 is the hemispherical cavities that are made of the plano-concave mirror 302 that a level crossing 301 and radius of curvature are 100mm, the chamber is long to be 100mm, has used in described laserresonator 3 by the Nd:LiLuF crystal 3 03 of water cooling plant temperature control and the lithium columbate crystal 304 of the electric-optically Q-switched mode of employing.Adopt lbo crystal as frequency-doubling crystal, the crystal acceptance angle is bigger, shg efficiency height, working stability.
Be the concrete parameter of implementing of the present invention below:
The 792nm laser diode of running is continuously adopted in pumping, and peak power output is 50W.One block specifications is that the Nd:LiLuF crystal of 3mm * 3mm * 4mm is placed near Effect of Back-Cavity Mirror, and its doping content is
The upper laser level life-span is 508us, and absorption coefficient is α=1.3/cm.The hemispherical cavity that resonant cavity adopts is that the plano-concave mirror of 100mm is formed by a level crossing and radius of curvature, and the chamber is long to be 100mm.It is electric-optically Q-switched to adopt lithium columbate crystal to carry out, and can obtain repetition rate is 100Hz, and pulse duration is 20ns, and single pulse energy is the 910nm laser output of 16mJ.By the cavity external frequency multiplication of lbo crystal, can obtain single pulse energy is the 455nm blue light output of 8mJ.Experiment shows, the present invention has compact conformation, volume is little, the life-span is long, the characteristics of working stability and good beam quality, and the present invention is fit to use under water, to realize underwater laser communication and undersea detection.
Claims (4)
1. all solid state 455nm pulse laser based on the neodymium-doped lithium lutetium fluoride crystal, be characterised in that its formation comprises the laser diode (1) of the fine output of magnetic tape trailer, set gradually pump light coupled system (2), include the laserresonator (3) and the frequency-doubling crystal (4) of Nd:LiLuF crystal and electric-optically Q-switched crystal along the direction of advance of this laser diode (1) output laser.
2. all solid state 455nm pulse laser according to claim 1, it is characterized in that described laserresonator (3) is by a level crossing (301) and has the hemispherical cavity that the plano-concave mirror (302) of certain curvature radius constitutes, and is provided with the Nd:LiLuF crystal (303) of water-cooled temperature control and the lithium columbate crystal (304) of the electric-optically Q-switched mode of employing in described laserresonator (3).
3. all solid state 455nm pulse laser according to claim 1, the laser diode (1) that it is characterized in that the fine output of described magnetic tape trailer is made of laser diode (101) and tail optical fiber (102), and described pump light coupled system (2) is made up of two identical convex lens of focal length.
4. according to each described all solid state 455nm pulse laser of claim 1 to 3, it is characterized in that described frequency-doubling crystal (4) is a lithium triborate crystal.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208746A (en) * | 2011-05-06 | 2011-10-05 | 中国科学院上海光学精密机械研究所 | All-solid-state 914nm pulse laser |
| CN102227045A (en) * | 2011-05-13 | 2011-10-26 | 中国科学院上海光学精密机械研究所 | Laser diode pumped full-solid-state 2mu m single frequency laser |
| CN102263356A (en) * | 2011-06-03 | 2011-11-30 | 中国科学院上海光学精密机械研究所 | Single-frequency narrow line width polarization maintaining full-optical fiber pulse laser device |
| CN103820855A (en) * | 2014-02-20 | 2014-05-28 | 宁波大学 | Tb<3+>/Sm<3+> doped LiLuF4 monocrystal used for white light LED, and preparation method thereof |
| CN104701728A (en) * | 2015-03-13 | 2015-06-10 | 李斌 | Flat concave cavity passive q-switched laser and laser generation method thereof |
| CN104701720A (en) * | 2015-03-13 | 2015-06-10 | 李斌 | Split type passively Q-switched UV-light laser device and laser generation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04296073A (en) * | 1991-03-25 | 1992-10-20 | Brother Ind Ltd | Blue light laser |
| CN2917036Y (en) * | 2006-06-30 | 2007-06-27 | 中国科学院上海光学精密机械研究所 | High-power narrow line-width full solid state 455nm pulse laser |
| CN101308991A (en) * | 2008-06-30 | 2008-11-19 | 山东大学 | Coupling cavity Raman frequency doubling completely solid yellow laser |
-
2010
- 2010-08-25 CN CN 201010265228 patent/CN101950917A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04296073A (en) * | 1991-03-25 | 1992-10-20 | Brother Ind Ltd | Blue light laser |
| CN2917036Y (en) * | 2006-06-30 | 2007-06-27 | 中国科学院上海光学精密机械研究所 | High-power narrow line-width full solid state 455nm pulse laser |
| CN101308991A (en) * | 2008-06-30 | 2008-11-19 | 山东大学 | Coupling cavity Raman frequency doubling completely solid yellow laser |
Non-Patent Citations (2)
| Title |
|---|
| 《CLEO》 20011231 M. Schmidt 等 Generation of 455nm radiation by intracavity doubling of a Nd:LiLuF4 laser 387-388 1-4 , 2 * |
| 《Journal of alloys and compounds》 20011231 Y.Guyot 等 Efficient 4f3(4F3/2)->4f25d excited-state absorption in Nd3+ doped fluofide crystals 722-725 1-4 , 2 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208746A (en) * | 2011-05-06 | 2011-10-05 | 中国科学院上海光学精密机械研究所 | All-solid-state 914nm pulse laser |
| CN102227045A (en) * | 2011-05-13 | 2011-10-26 | 中国科学院上海光学精密机械研究所 | Laser diode pumped full-solid-state 2mu m single frequency laser |
| CN102263356A (en) * | 2011-06-03 | 2011-11-30 | 中国科学院上海光学精密机械研究所 | Single-frequency narrow line width polarization maintaining full-optical fiber pulse laser device |
| CN103820855A (en) * | 2014-02-20 | 2014-05-28 | 宁波大学 | Tb<3+>/Sm<3+> doped LiLuF4 monocrystal used for white light LED, and preparation method thereof |
| CN103820855B (en) * | 2014-02-20 | 2016-11-16 | 宁波大学 | A kind of Tb for white light LEDs3+/ Sm3+doping LiLuF4monocrystal and preparation method thereof |
| CN104701728A (en) * | 2015-03-13 | 2015-06-10 | 李斌 | Flat concave cavity passive q-switched laser and laser generation method thereof |
| CN104701720A (en) * | 2015-03-13 | 2015-06-10 | 李斌 | Split type passively Q-switched UV-light laser device and laser generation method thereof |
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