CN107026387A - A kind of 1.5 μm of human eye safe waveband pulse lasers - Google Patents
A kind of 1.5 μm of human eye safe waveband pulse lasers Download PDFInfo
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- QWVYNEUUYROOSZ-UHFFFAOYSA-N trioxido(oxo)vanadium;yttrium(3+) Chemical compound [Y+3].[O-][V]([O-])([O-])=O QWVYNEUUYROOSZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- COQOFRFYIDPFFH-UHFFFAOYSA-N [K].[Gd] Chemical compound [K].[Gd] COQOFRFYIDPFFH-UHFFFAOYSA-N 0.000 claims description 3
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- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 claims description 2
- SJPVUFMOBDBTHQ-UHFFFAOYSA-N barium(2+);dioxido(dioxo)tungsten Chemical compound [Ba+2].[O-][W]([O-])(=O)=O SJPVUFMOBDBTHQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002223 garnet Substances 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims 1
- 229910019655 synthetic inorganic crystalline material Inorganic materials 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 6
- 229910017502 Nd:YVO4 Inorganic materials 0.000 description 4
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- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
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- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
Abstract
The invention discloses a kind of 1.5 μm of human eye safe waveband pulse lasers, including：Laser total reflective mirror plates pump light and 1.06 μm of anti-reflection, 1.3 μm of basic frequency lasers and 1.5 μm of stokes light high-reflecting films；Gain medium plating pump light, 1.06 μm, 1.3 μm, 1.5 μm of anti-reflection films；Raman gain medium plates 1.06 μm, 1.3 μm, 1.5 μm of anti-reflection films；Saturable absorber plates 1.06 μm, 1.3 μm, 1.5 μm of anti-reflection films；1.06 μm of laser output mirror plating is anti-reflection, high anti-, the 1.5 μm of stokes light parts of 1.3 μm of basic frequency lasers pass through film；1.3 μm of basic frequency lasers form passive Q-adjusted pulse operating under the laserresonator positive feedback effect and the modulating action of saturable absorber that laser total reflective mirror and laser output mirror are constituted；After Raman gain is more than the loss of resonator, occurs stimulated Raman scattering, 1.5 stable mu m waveband Stokes light generation are formed in Raman resonator；1.5 μm of Stokes light pulses are exported by laser output mirror.
Description
Technical field
The present invention relates to field of lasers, more particularly to a kind of 1.5 μm of human eye safe waveband pulse lasers.
Background technology
LASER Light Source near 1.5 μm of wavelength is in air and optical fiber transmission window, with to smoky environment penetration capacity
The characteristic such as by force, explorer response sensitivity is higher；It is simultaneously most of during wave band of laser irradiation human eye to be absorbed by crystalline lens, no
Easily focusing on retina causes human eye to burn, and is referred to as human eye safe waveband.
There is important application in terms of ranging, remote sensing, optic communication and medical treatment, volume structure is compact, operate stabilization
1.5 mu m waveband complete solid state pulse light source requirements are urgent.The solid state laser of the wave band of laser can directly be launched, Er ions are such as mixed
Crystal and glass and part Nd ionic mediums etc., be limited to the property of material in itself, its power and efficiency are all not satisfactory,
Semiconductor laser is also difficult to high peak power pulse operating.
Therefore, 1.5 μm of human eye safe waveband pulsed laser light sources of presently commercially available miniaturization are more based on passive Q-adjusted optics
Parametric oscillator (OPO) method is realized.However, OPO processes need to meet phase-matching condition, such miniaturized products application environment
It is often more complicated and many using conduction wind-cooling heat dissipating, it is difficult to keep constant temperature, thus in actual high and low temperature environment continuous firing
Often occur violent wave length shift, or even be unable to light extraction.
The rigors of phase-matching condition cause the small shape that laser is produced to casing by the factor such as temperature and vibration
Become also very sensitive, stability is difficult to ensure that.
The content of the invention
The invention provides a kind of 1.5 μm of human eye safe waveband pulse lasers, the present invention passes through passive Q-adjusted inner chamber Raman
The method of laser realizes 1.5 μm of human eye safe waveband pulse lasers simple and compact for structure, overcomes existing product high/low temperature
The shortcoming of environmental work power swing and wave length shift, improves laser stability, described below：
A kind of 1.5 μm of human eye safe waveband pulse lasers, the pulse laser includes：
Laser total reflective mirror is coated with pump light and 1.06 μm of anti-reflection, 1.3 μm of basic frequency lasers and 1.5 μm of stokes lights are high anti-
Film；Gain medium plating pump light, 1.06 μm, 1.3 μm, 1.5 μm of anti-reflection films；Raman gain medium plate 1.06 μm, 1.3 μm,
1.5 μm of anti-reflection films；Saturable absorber plates 1.06 μm, 1.3 μm, 1.5 μm of anti-reflection films；Laser output mirror plate 1.06 μm it is anti-reflection, 1.3
High anti-, the 1.5 μm of stokes light parts of μm basic frequency laser pass through film；
Laserresonator positive feedback effect that 1.3 μm of basic frequency lasers are constituted in laser total reflective mirror and laser output mirror and
Passive Q-adjusted pulse operating is formed under the modulating action of saturable absorber；After Raman gain is more than the loss of resonator, hair
Raw stimulated Raman scattering, forms 1.5 stable mu m waveband Stokes light generation in Raman resonator；1.5 μm of Stokes
Light pulse is exported by laser output mirror.
When the gain medium is Raman active crystal, the gain medium plays raman gain medium work
With.
The gain medium is specially：Nd-doped yttrium vanadate, neodymium-doped yttrium-aluminum garnet, neodymium-doped potassium-gadolinium or neodymium glass
Glass.
The raman gain medium is specially：Yttrium vanadate crystal, barium tungstate crystal or diamond crystal.
The saturable absorber is specially：Doped-vanadium yttrium garnet, graphene or black phosphorus.
The beneficial effect for the technical scheme that the present invention is provided is：
1st, the present invention realizes 1.5 μm of eye-safes by the inner chamber stimulated Raman scattering to passive Q-adjusted 1.3 μm of fundamental frequency lights
The pulse laser output of wave band, SRS processes are not limited by phase-matching condition；
2nd, compared with existing band pulse light source realized by OPO technologies, the work output wavelength drift of its high/low temperature
Small, output power stability is good；
3rd, beam cleanup (beam clean up) characteristic of stimulated Raman scattering causes output beam quality preferable；
4th, the gain medium with Raman active can be selected to realize from Ramar laser, saves Raman gain Jie
Matter, effectively reduces device Insertion Loss, have compressed small product size, reduces overall cost.
Brief description of the drawings
1.5 μm of human eye safe waveband pulse laser one embodiment that Fig. 1 provides for the present invention；
1.5 μm of human eye safe waveband pulse laser another embodiments that Fig. 2 provides for the present invention.
In accompanying drawing, the list of parts representated by each label is as follows：
1：Laser diode pumping source； 2：Energy-transmission optic fibre；
3：Coupled lens group； 4：Laser total reflective mirror；
5：Gain medium； 6：Raman gain medium；
7：Saturable absorber 8：Laser output mirror.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, further is made to embodiment of the present invention below
It is described in detail on ground.
Stimulated Raman scattering (SRS) is the important nonlinear optical frequency conversion skill for expanding laser coherence radiated wavelength range
One of art, with neodymium-doped (Nd) solid state laser4F3/2→4I13/21.3 μm of laser that transition is produced are fundamental frequency light, by Raman frequency shift
900cm-1One-level stimulated Raman scattering can frequency displacement to 1.5 mu m wavebands, the single order stokes light for obtaining human eye safe waveband is defeated
Go out.By passive Q-adjusted method, it can be achieved and its compact miniaturized device.
Compared with OPO, SRS has the characteristic that automatic phase is matched, and is not limited by phase-matching condition, the temperature of wavelength
Drift also very little.The High-performance lasers crystal much commonly used, such as Nd-doped yttrium vanadate (Nd:YVO4), neodymium-doped gadolinium vanadate (Nd:
GdVO4), neodymium-doped potassium-gadolinium (Nd:KGW) etc., it may have good Raman active, it can realize that laser is sent out in same crystal
Penetrate and realized from Ramar laser, due to laser medium and non-thread with stimulated Raman scattering process, acquisition Stokes light output
Property medium unite two into one, reduce by one piece of crystal, device Insertion Loss, compressed products volume, the overall cost of reduction can be effectively reduced.
Embodiment 1
In order to solve existing 1.5 μm of human eye safe waveband light-pulse generators based on OPO, the power when high and low temperature environment works
Fluctuation and the shortcoming of wave length shift, realize 1.5 μm of good human eye safe waveband arteries and veins of simple and compact for structure, cost economy, stability
Wash source off, it is as detailed below to retouch referring to Fig. 1 the embodiments of the invention provide a kind of 1.5 μm of human eye safe waveband pulse lasers
State：
1.5 μm of human eye safe waveband pulse lasers, including：Laser diode pumping source 1, energy-transmission optic fibre 2, coupling are saturating
Microscope group 3, laser total reflective mirror 4, gain medium 5, raman gain medium 6, saturable absorber 7 and laser output mirror 8,
Wherein, gain media 5 selects Nd:YAG crystal, crystal specification is 3 × 3 × 10mm3, doping concentration 0.5-at.%
(concentration values are only a preferred value, and the embodiment of the present invention is without limitation), its fundamental laser wavelength is 1319nm,
Two ends are coated with 808nm, 1064nm, 1319nm, 1503nm anti-reflection film system；Raman gain medium 6 selects BaWO4Crystal, 1319nm
Fundamental frequency light corresponds to its 926cm-1The single order Stokes optical wavelength of Raman frequency shift main peak be 1503nm, crystal specification be 3 × 3 ×
20mm3, two ends are coated with 1064nm, 1319nm, 1503nm anti-reflection film system；Saturable absorber 7 is V:YAG crystal, to 1319nm
Fundamental frequency light initial transmission 95%, two ends are coated with 1064nm, 1319nm, 1503nm anti-reflection film system；Laser total reflective mirror 4 is flat mirror,
Plate 808nm, 1064nm anti-reflection, 1319nm, 1503nm high reflectivity film stack；Laser output mirror 8 is concave mirror, radius of curvature 100mm, plating
1064nm is anti-reflection, 1319nm high anti-, 1503nm transmitance T=5-10% membrane systems, Resonant Intake System 40mm.
Laser diode pumping source 1 launches gain medium 5, i.e. Nd:808nm pump lights in YAG absorption of crystal bands,
Exported by energy-transmission optic fibre 2, coupled lens group 3 enters gain medium 5, i.e. Nd after focusing on through laser total reflective mirror 4:
YAG crystals；The Nd under pumping effect:YAG Crystallization population inversion, forms population inversion, occurs spontaneous radiation.
Due to saturable absorber 7, i.e. V:The absorption loss of YAG crystal, laser can not starting of oscillation.As pump power increases, Nd:YAG
The spontaneous radiation enhancing of crystal, V:YAG crystal is bleached.
Because each device is coated with 1064nm anti-reflection films, the higher 1064nm laser of gain can not starting of oscillation, and 1319nm swashs
Light forms pulse operating under the 1319nm laserresonator positive feedback effects that laser total reflective mirror 4 and laser output mirror 8 are constituted；
1319nm basic frequency lasers pass through raman gain medium 6, i.e. BaWO4Produce Raman gain during crystal, 1319nm basic frequency lasers it is strong
Degree is raised with the increase of pump power, and Raman gain is also increased, after Raman gain is more than the cavity loss of resonator,
Generation stimulated Raman scattering, forms stable 1503nm wave band Stokes light generation in Raman resonator；1503nm Si is held in the palm
Ke Si light is exported by laser output mirror 8, and mean power 200-300mW, arteries and veins can be produced under structure laser 10W pump powers
Rush repetition rate 20-40kHz 1.5 μm of laser output.
Wherein, gain medium 5 can be Nd:YAG, can also select Nd:GdVO4、Nd:YVO4Produced etc. other
1.3 mu m waveband lasers mix Nd gain medias, and different basic frequency laser and Stokes optical wavelength are corresponded to respectively, is implemented
When, the embodiment of the present invention is without limitation.
Wherein, raman gain medium 6 can be BaWO4Crystal, or BaNO3, KGW, diamond etc. is in 900cm-1
Nearby there are other conventional nonlinear crystals of higher Raman gain, when implementing, the embodiment of the present invention is without limitation.
Embodiment 2
Offer of the embodiment of the present invention is a kind of to realize self-stimulated Raman scattering using the gain medium with Raman active
Scheme, i.e. gain medium 5 plays a part of raman gain medium simultaneously, without single raman gain medium, reduces
The use of one piece of crystal, can further compress laser volume, and reduce cost, described below referring to Fig. 2：
Wherein, gain media 5 cuts Nd from a:YVO4Crystal, crystal specification is 3 × 3 × 20mm3, doping concentration 0.3-
At.% (concentration values are only a preferred value, and the embodiment of the present invention is without limitation), its fundamental laser wavelength is
1342nm, corresponds to its 890cm-1The single order Stokes optical wavelength of Raman frequency shift main peak is 1525nm, and crystal two ends are coated with
880nm, 1064nm, 1342nm, 1525nm anti-reflection film system；Saturable absorber 6 is V:YAG crystal, at the beginning of 1342nm fundamental frequency lights
Beginning transmitance 95%, two ends are coated with 1064nm, 1342nm, 1525nm anti-reflection film system；Laser total reflective mirror 4 be flat mirror, plating 880nm,
1064nm is anti-reflection, 1342nm, 1525nm high reflectivity film stack；Laser output mirror 8 is concave mirror, and radius of curvature 100mm, plating 1064nm increases
Thoroughly, high anti-, the 1525nm transmitance T=5-10% membrane systems of 1342nm.
880nm pump lights in the transmitting absorption band of gain medium 5 of laser diode pumping source 1, by energy-transmission optic fibre 2
Output, coupled lens group 3 enters gain medium 5, i.e. Nd after focusing on through laser total reflective mirror 4:YVO4Crystals；
The lower Nd of pumping effect:YVO4Crystallization population inversion, forms population inversion, occurs spontaneous radiation.Because saturable is inhaled
Acceptor 7, i.e. V:The absorption loss of YAG crystal, laser can not starting of oscillation.
As pump power increases, Nd:YVO4The spontaneous radiation enhancing of crystal, V:YAG crystal is bleached.Due to each device
Be coated with 1064nm anti-reflection films, the higher 1064nm laser of gain can not starting of oscillation, and 1342nm laser is in laser total reflective mirror 4 and swashs
Pulse operating is formed under the 1342nm laserresonator positive feedback effects that light output mirror 8 is constituted；1342nm basic frequency lasers pass through Nd:
YVO4Raman gain is produced during crystal, the intensity of 1342nm basic frequency lasers is raised with the increase of pump power, Raman gain
Also increase, after Raman gain is more than the cavity loss of resonator, occurs stimulated Raman scattering, formed in Raman resonator
Stable 1525nm wave band Stokes light generation；1525nm stokes lights are exported by laser output mirror 8, the structure laser
Mean power 300-400mW, pulse recurrence frequency 30-50kHz 1.5 μm of laser output can be produced under device 10W pump powers.
Wherein, gain medium 5 can be Nd:YVO4, Nd can also be selected:GdVO4、Nd:KGW etc. is other to be produced
1.3 mu m waveband lasers and in 900cm-1Nearby have higher Raman gain other it is conventional mix Nd gain medias, correspond to respectively not
Same basic frequency laser and Stokes optical wavelength, when implementing, the embodiment of the present invention is without limitation.
To sum up, it is an object of the invention to overcome current 1.5 μm of human eye safe waveband pulse lasers, in high and low temperature environment
The serious shortcoming of lower power and wave length shift, realizes 1.5 μm of good eye-safes of simple and compact for structure, cost economy, stability
Band pulse light source.By using the method for passive Q-adjusted inner chamber Ramar laser, by the automatic phase of stimulated Raman scattering
Matching properties, are prevented effectively from temperature and wave length shift caused by device working environment and thermal accumlation, so as to obtain compact, stably
The output of 1.5 μm of human eye safe waveband pulse lasers, SRS beam cleanup characteristic also contributes to improve the light beam matter of output laser
Amount.Particularly when from the gain medium with Raman active, it can realize from Ramar laser, without individually drawing
Graceful gain media, can further compress laser volume, reduce cost.
The embodiment of the present invention is to the model of each device in addition to specified otherwise is done, and the model of other devices is not limited,
As long as the device of above-mentioned functions can be completed.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, and the quality of embodiment is not represented.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (4)
1. a kind of 1.5 μm of human eye safe waveband pulse lasers, it is characterised in that the pulse laser includes：
Laser total reflective mirror is coated with pump light and 1.06 μm of anti-reflection, 1.3 μm of basic frequency lasers and 1.5 μm of stokes light high-reflecting films；Swash
Optical gain medium plating pump light, 1.06 μm, 1.3 μm, 1.5 μm of anti-reflection films；Raman gain medium plates 1.06 μm, 1.3 μm, 1.5 μm
Anti-reflection film；Saturable absorber plates 1.06 μm, 1.3 μm, 1.5 μm of anti-reflection films；Laser output mirror plates 1.06 μm of anti-reflection, 1.3 μm of bases
High anti-, the 1.5 μm of stokes light parts of frequency laser pass through film；
Laserresonator positive feedback effect and can satisfy that 1.3 μm of basic frequency lasers are constituted in laser total reflective mirror and laser output mirror
Operated with passive Q-adjusted pulse is formed under the modulating action of absorber；When Raman gain be more than resonator loss after, occur by
Swash Raman scattering, 1.5 stable mu m waveband Stokes light generation are formed in Raman resonator；1.5 μm of stokes light arteries and veins
Punching is by laser output mirror output；
When the gain medium is Raman active crystal, the gain medium plays raman gain medium effect.
2. a kind of 1.5 μm of human eye safe waveband pulse lasers according to claim 1, it is characterised in that the laser
Gain media is specially：Nd-doped yttrium vanadate, neodymium-doped yttrium-aluminum garnet, neodymium-doped potassium-gadolinium or neodymium glass.
3. a kind of 1.5 μm of human eye safe waveband pulse lasers according to claim 1 or 2, it is characterised in that the drawing
Graceful gain media is specially：Yttrium vanadate crystal, barium tungstate crystal or diamond crystal.
4. a kind of 1.5 μm of human eye safe waveband pulse lasers according to claim 1, it is characterised in that described to satisfy
It is specially with absorber：Doped-vanadium yttrium garnet, graphene or black phosphorus.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109346915A (en) * | 2018-09-28 | 2019-02-15 | 天津大学 | A kind of single longitudinal mode solid state laser based on inner cavity stimulated Raman scattering |
| CN109742648A (en) * | 2019-01-28 | 2019-05-10 | 河海大学 | Infrared solid laser based on exocoel optical parametric oscillation and stimulated raman scattering |
| CN110265863A (en) * | 2018-03-12 | 2019-09-20 | 中国科学院大连化学物理研究所 | A kind of intracavitary anti-Stokes Raman laser and excited Raman blue shift wavelength maximize output method |
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|---|---|---|---|---|
| CN101319397A (en) * | 2008-06-30 | 2008-12-10 | 山东大学 | Double-tungstate self-raman crystal and preparation and application thereof |
| CN102104231A (en) * | 2011-01-06 | 2011-06-22 | 中国科学院上海光学精密机械研究所 | Graphite Raman locked mode laser |
| CN103996968A (en) * | 2014-05-27 | 2014-08-20 | 天津大学 | Self Raman yellow light laser of composite cavity structure |
| CN104319614A (en) * | 2014-11-05 | 2015-01-28 | 天津大学 | 1.5-micron human eye safety wave band ultrashort pulse laser |
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| CN110265863B (en) * | 2018-03-12 | 2020-09-01 | 中国科学院大连化学物理研究所 | Intracavity anti-Stokes Raman laser and stimulated Raman blue shift wavelength maximum output method |
| CN109346915A (en) * | 2018-09-28 | 2019-02-15 | 天津大学 | A kind of single longitudinal mode solid state laser based on inner cavity stimulated Raman scattering |
| CN109346915B (en) * | 2018-09-28 | 2020-07-31 | 天津大学 | Single longitudinal mode solid laser based on inner cavity stimulated Raman scattering |
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