CN102074887A - Self frequency conversion solid state laser based on neodymium doped gadolinium calcium oxborate crystal - Google Patents
Self frequency conversion solid state laser based on neodymium doped gadolinium calcium oxborate crystal Download PDFInfo
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Abstract
The present invention relates to a self frequency conversion solid state laser based on neodymium doped gadolinium calcium oxborate crystal, compromising a self frequency conversion crystal composed of NdxGd1-xCa4O(BO3)3 wherein x is from 0.001 to 0.2, a pumping source, and a laser resonator. The self frequency conversion crystal is cut along a direction perpendicular to the frequency conversion phase match direction of the crystal, and two light-through end surfaces of the self frequency conversion crystal are polished; the pumping source is a laser with wave length from 802 to 815 nm, 830nm, or from 868 to 887 nm, and the laser resonator realizes a unity feedback of the fundamental frequency light and a unity output of the frequency conversion light; wherein the laser resonator is set in front of a pumping source output optical path, the self frequency conversion crystal is arranged in the laser resonator, and the pumping mode is an end surface pumping mode or a side surface pumping mode. The self multiplication frequency, self sum frequency, self slip frequency or self parameter oscillation laser output of different fundamental frequency light can be obtained through determining the optimal frequency conversion phase match direction of the crystal in different fundamental frequency wave lengths and designing the corresponding laser cavity mirror membrane transmittance. The solid state laser is small in size, compact in structure, and stable in performance.
Description
Technical field
The present invention relates to a kind of self frequency-changing's solid state laser, particularly relate to a kind of self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium (Nd:GdCOB) crystal.
Background technology
Along with the development of laser technology and in field application more and more widely such as information stores, biomedicine, laser display, optical researches, also more and more urgent to the demand of solid state laser with different output wavelengths.Visible wavelength lasers all is widely used at aspects such as panchromatic demonstration, medical treatment, printing, amusement and scientific researches.At present, the main path of acquisition green glow output is to adopt frequency-doubling crystal KTP, PPLN or LBO etc. to Nd
3+The 1.06 μ m laser that ion produces carry out the green glow output that frequency multiplication obtains 0.53 μ m.For the green glow output of middle low power, adopt Nd:YVO usually
4The mode of+KTP obtains.With Nd:YVO
4Glued together with ktp crystal, and directly plate chamber mirror film at the crystal two ends of gummed, form laserresonator.The efficient of this way acquisition green glow is higher, has realized commercialization.But this laser that comprises working-laser material and two kinds of crystal of double-frequency material, structure more complicated, stability are not very strong, and the gluing technique of two crystal has limited the cost and the development of this laser always.
Self frequency-changing's crystal is an ideal style that obtains visible laser output.Active ions are doped into a crystal with nonlinear optical properties, and making it is laser crystal, has nonlinear function again.When the cut direction of crystal during along the direction cutting of phase matched, just can directly carry out at the basic frequency laser that crystals produces ion from frequency multiplication, from and frequently, from difference frequency or from parametric oscillation, thereby the self frequency-changing's laser that obtains different wave length is exported.In principle, self frequency-changing's laser structure is simply compact, and stability is strong, and cost of manufacture is low.People are exploring efficiently always, are being fit to self frequency-changing's crystal of practicability in recent years, and that wherein mainly be studied is the self-frequency-doubling crystal, and self frequency-changing's phenomenon is fewer appears in the newspapers for other.Realize that at first the crystal from the output of frequency multiplication green glow is Nd:MgO:LiNbO
3But LiNbO
3The pumping threshold height of crystal, very low and have photorefractive effect from shg efficiency, can not obtain practical application.Nd
xY
1-xAl
3(BO
3)
4(NYAB) once be considered to be hopeful most to realize the crystal of green glow from frequency multiplication output, the green glow that can obtain 225mW with LD pumping NYAB crystal is exported, and the light light conversion efficiency is 14%.But because YAl (BO
3)
4(YAB) and NdAl (BO
3)
4(NAB) crystal structure difference causes the optical homogeneity of NYAB crystal relatively poor, makes the NYAB crystal of growing high-quality very difficult, can not satisfy commercial requirement.Because Nd:Mg:LiNbO
3With these shortcomings of NYAB crystal, hindered these two kinds of laser self frequency-doubling crystals and moved towards practical.
The appearance of new pattern laser self frequency-changing crystal neodymium-doped calcium oxygen gadolinium (Nd:GdCOB) has brought new hope for the research and the practicability of laser self frequency-changing crystal.Because this crystalloid can be used Czochralski grown, obtains large scale, high-quality monocrystalline easily.Is 225mW with ti sapphire laser pumping Nd:GdCOB crystal from frequency multiplication green glow power output; Is 114mW with LD (laser diode) pumping Nd:GdCOB crystal from frequency multiplication green glow power output; Average chamber laser self-frequency-doubling's green glow power output of LD pumping Nd:GdCOB crystal is 22mW, LD pumping Nd:GdCOB crystal micro-chip is output as 20mW from the frequency multiplication green laser, and (cut direction is θ=90 °, φ=35 °), and on its optimum frequency multiplication direction, it can reach 960mW (cut direction is θ=113 °, φ=36.4 °) from frequency multiplication green laser output.In addition, we in the experimentation of frequency multiplication, have also found oneself and frequency phenomenon of two fundamental frequency light at this crystal.Above result has fully showed research prospect and the using value of Nd:GdCOB aspect the self frequency-changing.At present, among some self frequency-changing's lasers that can obtain practical application are are designing and producing.
In view of these advantages more than the Nd:GdCOB, the present invention is directed to is the deficiency that operation material is made the green (light) laser of middle low power at present with Nd:YVO4+KTP, with crystal of Nd:GdCOB simultaneously as gain media and frequency converting element, two end faces of crystal are along the phase matched direction cutting perpendicular to the self frequency-changing, add the epicoele mirror at self frequency-changing's crystal two ends, perhaps end face is directly carried out Machining of Curved Surface and plated film, form laserresonator, employing can be by the effective laser that absorbs of this self frequency-changing's crystal as pumping source (near 800～885nm), obtain 936nm, 1060nm, 1090nm, and the fundamental frequency light of wave band turns round near the 1332nm, the nonlinear optical effect of utilizing laser crystal self to have again, realize above fundamental frequency light from frequency multiplication, from and frequently, from difference frequency, perhaps export from the laser of parametric oscillation.The present invention makes laser structure simple more compact, simplified the preparation technology of low-power laser, reduced cost of manufacture, and the reliability and stability of laser have been improved, help the application and the industrialization of self frequency-changing's laser, and promoted of the development of novel small-power from the frequency multiplication green (light) laser.
Summary of the invention
The objective of the invention is to utilize self frequency-changing Nd:GdCOB crystal as gain media and frequency converting element, employing can be by the effective laser that absorbs of this self frequency-changing's crystal as pumping source, by determining the frequency conversion optimum phase matching direction of this crystal in different fundamental light wave strong points, design corresponding rational laser resonant cavity mirror transmitance resonant cavity type, and can on self frequency-changing's crystal both ends of the surface, directly carry out Machining of Curved Surface and plated film and replace laser mirror, obtain a kind of simple and compact for structure, good stability, manufacture craft is simple, cost is low self frequency-changing's solid state laser.Utilize this self frequency-changing's crystal and corresponding self frequency-changing's laser technique, can implementation structure miniaturization, simple and compact for structure, the solid state laser of the indigo plant that stability is high, green, red, near-infrared even THz scope.
The object of the present invention is achieved like this:
Self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium (Nd:GdCOB) crystal provided by the invention comprises Nd:GdCOB self frequency-changing crystal, pumping source and laserresonator, it is characterized in that: described self frequency-changing's crystal is Nd
xGd
1-xCa
4O (BO
3)
3, x=0.001～0.2 wherein, the cut direction of this self frequency-changing's crystal is along perpendicular to this crystal frequency conversion phase matched direction cutting, the polishing of two logical light end faces; Described pumping source is the laser of wavelength at 802～815nm, 830nm or 868～887nm wave band; Described laserresonator is realized unity feedback to fundamental frequency light, and frequency conversion light is realized full output; Wherein, described pumping source output light path the place ahead is provided with laserresonator, settles described self frequency-changing's crystal in laserresonator, and pump mode is end pumping mode or profile pump mode.
In above-mentioned technical scheme, between described pumping source and described input cavity mirror, also comprise a coupling unit, improve the efficient that pump light is coupled into crystal, described coupling unit is single coupled lens, or the coupled lens group.
In above-mentioned technical scheme, described laserresonator has three types:
(1) described laserresonator is made of independently input cavity mirror and output cavity mirror, self-frequency-doubling crystal two ends plated film not wherein, or plate pump light, fundamental frequency light and all anti-reflection rete of frequency conversion light, to eliminate the Fresnel scattering loss;
(2) described laserresonator is by directly plating the laser mirror film as the input cavity mirror at self-frequency-doubling crystal's input end face, export with the self-frequency-doubling crystal and an output cavity mirror to be set on the light path of light to constitute, at self-frequency-doubling crystal's output end face plated film or plate not, to eliminate the Fresnel scattering loss to pump light, fundamental frequency light and all anti-reflection rete of frequency conversion light;
(3) described laserresonator all plates the laser mirror film by direct two end faces at laser crystal, constitutes a laser that does not have independent input cavity mirror and output cavity mirror, makes laser structure simple more compact.
In above-mentioned technical scheme, described input cavity mirror (perhaps crystal input end face plated film) is to pump light high saturating (HT), fundamental frequency light and frequency doubled light high anti-(HR); Described output cavity mirror (perhaps crystal output end face plated film) can be to fundamental frequency light high anti-(HR) and frequency doubled light high saturating (HT), also can be except that to fundamental frequency light high anti-(HR) and the frequency doubled light high (HT) thoroughly, also to pump light high anti-(HR), to improve the absorptivity of pump light, improve the laser delivery efficiency.
In above-mentioned technical scheme, described laserresonator can also be realized refrative cavity except that the ordinary lines die cavity, for example: L die cavity (accompanying drawing 8), v-shaped cavity (accompanying drawing 9) etc.
In above-mentioned technical scheme, described Nd
xGd
1-xCa
4O (BO
3)
3Self frequency-changing's crystal is along (for example: frequency multiplication and frequency, difference frequency or parametric oscillation) optimum phase matching direction cuts (being the direction of effective non-linear susceptibility χ eff maximum), and two logical light end faces perpendicular to this direction are carried out polishing perpendicular on the primary flat or space up-conversion.Its logical optical cross-section is circle, rectangle, ellipse etc., and optical direction thickness is 0.1～20mm.
In above-mentioned technical scheme, also comprise being used for Nd
xGd
1-xCa
4O (BO
3)
3The refrigeration temperature regulating device of self frequency-changing's crystal cooling, described refrigeration temperature regulating device are water-cooled or semiconductor TEC refrigeration etc.
In above-mentioned technical scheme, described self frequency-changing's solid state laser also comprises adopting transfers Q, the laser of general laser technology such as locked mode.
In above-mentioned technical scheme, described pumping source is semiconductor laser, fiber laser or the tunable ti sapphire laser of photoflash lamp, single tube or modular form; The output form of pumping source is output continuously or pulse output; Pump mode is end pumping mode or profile pump mode.
In above-mentioned technical scheme, laserresonator add the curvature of input and output chamber mirror or crystal input and output end face directly the curvature of processing can change between ± the 50mm at ± ∞, thereby realize multiple different cavity types such as average chamber, flat-concave cavity, plano-convex chamber, concavo-convex chamber, concavo-concave chamber, convexo-convex chamber.
In above-mentioned technical scheme, adopt described self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal, can obtain near the fundamental frequency light running of the wave band of 936nm, 1060nm, 1090nm and 1332nm, the nonlinear optical effect of utilizing this laser crystal self to have again, cooperate the cutting of crystal frequency conversion optimum phase matching direction, design corresponding laser mirror film transmitance, can realize following these laser outputs respectively:
(1) near exporting 468nm, 530nm, 545nm or the 666nm from the frequency multiplication visible laser;
(2) oneself and frequency laser output of certain two fundamental frequency light, for example: 1060nm and 1090nm are output as the 537nm green glow with frequency;
(3) certain fundamental frequency light and pump light from and output frequently, for example: 1060nm fundamental frequency light and 808nm pump light from and be output as the 458nm blue light frequently;
(4) the autodyne frequency laser of certain two fundamental frequency light output, for example: the difference frequency of 1060nm and 1090nm is output as 7.78THz;
(5) the laser output from parametric oscillation of certain fundamental frequency light.
Compared with the prior art self frequency-changing's solid state laser of the present invention has the following advantages:
Technical scheme of the present invention is to utilize self frequency-changing Nd:GdCOB crystal as gain media and frequency converting element, employing can be by the effective laser that absorbs of this self frequency-changing's crystal as pumping source, by determining the frequency conversion optimum phase matching direction of this crystal in different fundamental light wave strong points, designed rational laser resonant cavity mirror transmitance resonant cavity type, and can on self frequency-changing's crystal both ends of the surface, directly carry out Machining of Curved Surface, and plate pump light in self frequency-changing's crystal both ends of the surface, fundamental frequency light and all anti-reflection rete of frequency conversion light, replace laser mirror, obtain a kind of simple and compact for structure, good stability, manufacture craft is simple, the self frequency-changing's that cost is low solid state laser.Utilize this self frequency-changing's crystal and corresponding self frequency-changing's laser technique, can implementation structure miniaturization, simple and compact for structure, the solid state laser of the indigo plant that stability is high, green, red, near-infrared even THz scope.
1. the laser self frequency-changing crystal Nd:GdCOB of the present invention's employing can use Czochralski grown, obtains large scale, high-quality monocrystalline easily; Effective nonlinear coefficient is big, and additive mixing efficient height obtains high efficiency self frequency-changing's laser output easily;
2. the laser crystal that utilization of the present invention has a non-linear and optical property realize outside frequency multiplication from and frequently, from difference frequency, from self frequency-changing's laser operation of alternate manners such as parametric oscillation; Based on this thought, can realize the laser output of indigo plant, green, red, near-infrared even THz scope, and technology is simple, system compact is stable.
3. the present invention proposes and can directly carry out Machining of Curved Surface and plated film to self frequency-changing's crystal end-face, not only can realize the average chamber of microchip, can also realize other various different microchips chamber types such as flat-concave cavity, plano-convex chamber, concavo-convex chamber, concavo-concave chamber, convexo-convex chamber; Do not add the chamber mirror, when making laser structure more simply compact, can change the chamber type, improving the laser delivery efficiency.
4. the present invention also proposes described self frequency-changing's solid state laser and can adopt accent Q, and the laser technology that locked mode etc. are general has further enlarged self frequency-changing's Study on Technology and range of application.
Description of drawings
Fig. 1 is a kind of natural cooling self frequency-changing solid state laser structural representation of the present invention.
Fig. 2 is a kind of temperature control cooling self frequency-changing solid state laser structural representation of the present invention.
Fig. 3 is a kind of continuous output self frequency-changing microchip solid state laser structural representation of the present invention.
Fig. 4 is a kind of flat-concave cavity microchip pulse output self frequency-changing solid state laser structural representation of the present invention.
Fig. 5 is a kind of concave-concave of the present invention chamber microchip self frequency-changing solid state laser structural representation.
Fig. 6 is a kind of plano-convex of the present invention chamber self frequency-changing's solid state laser structural representation.
Fig. 7 is a kind of profile pump self frequency-changing solid state laser structural representation of the present invention.
Fig. 8 is a kind of L die cavity self frequency-changing solid state laser structural representation of the present invention.
Fig. 9 is a kind of v-shaped cavity self frequency-changing solid state laser structural representation of the present invention.
Figure 10 is a kind of self frequency-changing's Q-switch solid laser structural representation of the present invention.
The drawing explanation:
1-pumping source 2-self frequency-changing crystal 3-input cavity mirror
The cooling heat radiator of 4-output coupling mirror 5-pumping source
6-coupling unit 7-shoot laser
The 8-anti-reflection film is to the film of pump light wavelength, fundamental frequency light and frequency conversion light high saturating (HT)
9-input cavity mirror film is to pump light wavelength high saturating (HT), to fundamental frequency light and the high anti-film of (HR) of frequency conversion light
10-output cavity mirror film is to the film of fundamental frequency light high anti-(HR), frequency conversion light high saturating (HT)
The cooling heat radiator of 11-laser pump cavity 12-acoustooptic Q-switching 13-crystal
The cooling heat radiator 15-refrative cavity mirror of 14-Q switch
Embodiment
Below in conjunction with drawings and Examples the present invention is done in further detail explanation.
With reference to figure 1, make a kind of self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium (Nd:GdCOB) crystal.
Present embodiment uses the Nd:GdCOB self frequency-changing crystal 2 of doping content as 5at.%, presses θ=90 °, φ=47.5 ° direction cutting, and two end faces of optical direction carry out polishing according to the glossing of laser crystal.The logical light face of self frequency-changing's crystal 2 is a square, and self frequency-changing's crystal 2 is of a size of 3 * 3 * 5mm, and the end face of self frequency-changing's crystal 2 plated film not.Self frequency-changing's crystal 2 does not add cooling heat radiator, adopts the natural cooling mode.
It is the continuous output semiconductor laser diode of 808nm that pumping source 1 adopts emission wavelength, and pump mode is an end pumping.(can buy on the market) that pumping source 1 adopts the cooling heat radiator of being furnished with pumping source.
Output coupling mirror 4 is flat mirror, and filming parameter is: to high anti-(HR) film of 1061nm and high saturating (HT) film of 530.5nm.
The light path of present embodiment is formed: set gradually light path coupling device 6, input cavity mirror 3, self frequency-changing's crystal 2 and output coupling mirror 4 in light path the place ahead of pumping source 1.
Because the end face of the self frequency-changing's crystal 2 that adopts is plated film not, so adopting, laser mirror adds input cavity mirror 3 and the average chamber of output coupling mirror 4 formations, self frequency-changing's crystal 2 is arranged in this average chamber; As shown in Figure 1, pumping source 1 output light the place ahead is provided with self frequency-changing's crystal 2, the output coupling cavity mirror 4 of coupling optical path 6, input cavity mirror 3, Nd:GdCOB in proper order; Pump light is incident on the incident end face of self frequency-changing's crystal 2 in the mode of end pumping, and when pump light reached threshold value, experiment obtained shoot laser 7, promptly obtains 530.5nm and exports from the frequency multiplication green laser.
This example basic structure can be applied to the Nd:GdCOB crystal equally certainly with frequently, from difference frequency with on parameter oscillation laser, only need be according to concrete target wavelength, the cut direction of change crystal and the parameter designing of chamber mirror film, this is that those skilled in the art can be realized.
With reference to figure 2, make a kind of self frequency-changing's solid state laser based on the Nd:GdCOB crystal.
Pumping source 1, coupling unit 6, self frequency-changing's crystal 2, input cavity mirror 3 and output coupling mirror 4 that present embodiment adopts, the composition light path of making self frequency-changing's solid state laser is identical with embodiment 1.
Difference is:
(1) this self frequency-changing's solid state laser existing independently input cavity mirror and output coupling cavity mirror plate at self frequency-changing's crystal 2 two ends again all anti-reflection rete 8 of pump light, fundamental frequency light and frequency conversion light, to eliminate the Fresnel scattering loss.
(2) self frequency-changing's crystal 2 being positioned in the crystal refrigeration temperature regulating device 13, is the cooling heat dissipation mode with the water-cooled, is the heat conduction media with the heat sink crystal frame of contact red copper, simultaneously fixed crystal.
, described coupling unit is arranged between described pumping source and the described input cavity mirror, and described coupling unit is single coupled lens, or the coupled lens group,
With reference to figure 3, make a kind of self frequency-changing's microchip solid state laser based on the Nd:GdCOB crystal.
The pumping source 1 that present embodiment adopts, self frequency-changing's crystal 2, crystal refrigeration temperature regulating device 13, and self frequency-changing's crystal 2 is installed in the refrigeration temperature regulating device 13, the composition light path of its solid state laser is identical with embodiment 1.
Difference is:
(1) remove independently input cavity mirror 3, high saturating to pump light in the plating of self frequency-changing's crystal 2 input end face, the high anti-rete 9 of fundamental frequency light and frequency doubled light is as the input cavity mirror;
(2) remove independently output coupling cavity mirror 4, at the film 10 that the plating of self frequency-changing's crystal 2 output end face is anti-to fundamental frequency light height and the frequency doubled light height is saturating, as the output cavity mirror.
Present embodiment removes and adds the chamber mirror, directly chamber mirror film is plated in the crystal two ends, has simplified laser structure greatly, can be referred to as " microchip " solid state laser.This laser structure is simple more, compact, performance is more stable.This example basic structure can be applied to the Nd:GdCOB crystal equally certainly with frequently, from difference frequency with on parameter oscillation laser, only need be according to concrete target wavelength, the cut direction of change crystal and the parameter designing of chamber mirror film, this is that those skilled in the art can be realized.
Embodiment 4
With reference to figure 4, make a kind of flat-concave cavity microchip pulse output self frequency-changing solid state laser based on the Nd:GdCOB crystal.
Self frequency-changing's crystal 2, laserresonator output cavity mirror film 10 that present embodiment adopts, the composition light path of pump mode and self frequency-changing's solid state laser is identical with embodiment 3.
Difference is:
(1) pumping source 1 is a semiconductor laser still, but emission wavelength changes 885nm into, and output form is an impulse form, and duty ratio is 50%.
(2) the rete parameter of the input cavity mirror film 9 of Nd:GdCOB crystal is: to high anti-(HR) film of saturating (HT) film of the height of pump light wavelength (885nm), 1061nm and 530.5nm.
(3) circle is processed in the cross section of logical light face of the self-frequency-doubling crystal 2, two end face diameters are 3mm, length is 5mm, wherein the outgoing end face is processed to the sphere of certain curvature (R=200mm), and directly plate output cavity mirror film at this sphere, make two end faces of self-frequency-doubling crystal form the platycelous laserresonator, can improve laser output power.
After pumping light power reaches threshold value, can obtain shoot laser 7, promptly obtain near exporting of the impulse form of 530.5nm from the frequency multiplication green laser.This example basic structure can be applied to the Nd:GdCOB crystal equally certainly with frequently, from difference frequency with on parameter oscillation laser, only need be according to concrete target wavelength, the cut direction of change crystal and the parameter designing of chamber mirror film, this is that those skilled in the art can be realized.
With reference to figure 5, make a kind of concave-concave chamber microchip self frequency-changing solid state laser based on the Nd:GdCOB crystal.
Self frequency-changing's crystal 2, laserresonator chamber mirror film 9,10 that present embodiment adopts, self frequency-changing's crystal 2 of pump mode and present embodiment are installed in the refrigeration temperature regulating device 13, and the composition light path of its solid state laser is identical with embodiment 3
Difference is:
What (1) pumping source 1 adopted is tunable ti sapphire laser, and emission wavelength is adjusted to 808nm.
(2) the logical light face of crystal is processed into circle, end face diameter is 3mm, length is 5mm, two end faces of the incident of crystal and outgoing all are processed to the sphere of certain curvature (R=200mm), and then plate chamber mirror coating 9,10, make former and later two end faces of crystal form the double concave type laserresonator, can improve laser output power.
In this example, the pumping source wavelength can also be selected to be adjusted near 802～815nm, 830nm, the 868～887nm wave band, and the Nd:GdCOB crystal all has absorption in above wavelength location, can realize that crystal is to the absorption of pump light and the emission of self frequency-changing's laser.In addition, the parameter designing of incident end chamber mirror coating will be made corresponding change simultaneously.
With reference to figure 6, make a kind of plano-convex chamber self frequency-changing's solid state laser based on the Nd:GdCOB crystal.
The composition light path of pumping source 1, self frequency-changing's crystal 2, pump mode and self frequency-changing's solid state laser that present embodiment adopts is identical with embodiment 3.
Difference is:
(1) parameter of crystal incident end chamber mirror film 9 changes near high anti-(HR) film high saturating (HT) film, 1060～1090nm and the 537.5nm of pump light wavelength (808nm)
(2) plating of the outgoing end face of crystal sees through the film 8 of (HT) near the height pump light wavelength (808nm), 1060～1090nm and the 537.5nm, then the coaxial placement radius of curvature of output for-1000mm, be coated with to 808nm and 1060～1090nm high anti-(HR), to 537.5nm near the output coupling mirror 4 of high saturating (HT) rete, form chamber, plano-convex chamber type.
(3) crystal heat abstractor 13 is taked TEC refrigeration temperature control, is the heat conduction media by the heat sink crystal frame of contact red copper still, simultaneously fixed crystal.
After pumping light power reaches threshold value, can obtain exporting with frequency 537.5nm green laser certainly of fundamental frequency light 1060nm and 1090nm.This example basic structure can be applied to the Nd:GdCOB crystal equally from frequency multiplication, from difference frequency with on parameter oscillation laser, only need be according to concrete target wavelength, the cut direction of change crystal and the parameter designing of chamber mirror film, this is that those skilled in the art can be realized.
With reference to figure 7, make a kind of profile pump self frequency-changing solid state laser based on the Nd:GdCOB crystal.
Self frequency-changing's crystal 2, resonant cavity two chamber mirror design and implementation examples 2 that present embodiment adopts are identical.
Difference is: pumping source 1 has adopted photoflash lamp, and pump mode is a profile pump, adds that laser pump cavity 11 is high efficiency to reflex to pump light on the laser crystal, and this is that those skilled in the art can be implemented.
With reference to figure 8, make a kind of L die cavity self frequency-changing solid state laser based on the Nd:GdCOB crystal.
Self frequency-changing's crystal 2, output cavity mirror design and implementation example 2 that present embodiment adopts are identical.
Difference is:
(1) adopts two identical pumping sources 1, adopt semiconductor laser here, carry out both-end pumping.
(2) two identical input cavity mirrors 3, two identical coupling units 6 and output coupling mirrors 4; Two identical pumping sources 1 are symmetricly set on the line, and two coupling units 6 are set respectively on the middle light path of two pumping sources 1, in two identical coupling unit 6 output light paths, vertically be provided with successively an input cavity mirror 3,
The composition light path of pumping source 1, self frequency-changing's crystal 2, pump mode and self frequency-changing's solid state laser that present embodiment adopts is identical with embodiment 3.
Difference is:
(1) parameter of crystal incident end chamber mirror film 9 changes near high anti-(HR) film high saturating (HT) film, 1060～1090nm and the 537.5nm of pump light wavelength (808nm)
(2) plating of the outgoing end face of crystal sees through the film 8 of (HT) near the height pump light wavelength (808nm), 1060～1090nm and the 537.5nm, then the coaxial placement radius of curvature of output for-1000mm, be coated with to 808nm and 1060～1090nm high anti-(HR), to 537.5nm near the output coupling mirror 4 of high saturating (HT) rete, form chamber, plano-convex chamber type.
(3) crystal heat abstractor 13 is taked TEC refrigeration temperature control, is the heat conduction media by the heat sink crystal frame of contact red copper still, simultaneously fixed crystal.
After pumping light power reaches threshold value, can obtain exporting with frequency 537.5nm green laser certainly of fundamental frequency light 1060nm and 1090nm.This example basic structure can be applied to the Nd:GdCOB crystal equally from frequency multiplication, from difference frequency with on parameter oscillation laser, only need be according to concrete target wavelength, the cut direction of change crystal and the parameter designing of chamber mirror film, this is that those skilled in the art can be realized.
With reference to figure 7, make a kind of profile pump self frequency-changing solid state laser based on the Nd:GdCOB crystal.
Self frequency-changing's crystal 2, resonant cavity two chamber mirror design and implementation examples 2 that present embodiment adopts are identical.
Difference is: pumping source 1 has adopted photoflash lamp, and pump mode is a profile pump, adds that laser pump cavity 11 is high efficiency to reflex to pump light on the laser crystal, and this is that those skilled in the art can be implemented.
With reference to figure 8, make a kind of L die cavity self frequency-changing solid state laser based on the Nd:GdCOB crystal.
Self frequency-changing's crystal 2, output cavity mirror design and implementation example 2 that present embodiment adopts are identical.
Difference is:
(1) adopts two identical pumping sources 1, adopt semiconductor laser here, carry out both-end pumping.
(2) two identical input cavity mirrors 3, two identical coupling units 6 and output coupling mirrors 4; Two identical pumping sources 1 are symmetricly set on the line, two coupling units 6 are set respectively on the middle light path of two pumping sources 1, an input cavity mirror 3, self frequency-changing's crystal 2 and another piece input cavity mirror 3 vertically are set successively, 45 ° of settings of these input cavity mirror 3 inclinations in two identical coupling unit 6 output light paths; Input cavity mirror 3 is identical with embodiment 2, and right-hand member input cavity mirror 3 is high saturating, fundamental frequency light of 45 ° of pump lights and frequency doubled light high reflective mirror, forms L chamber type.
With reference to figure 9, make a kind of v-shaped cavity self frequency-changing solid state laser based on the Nd:GdCOB crystal.
Pumping source 1, coupling unit 6, self frequency-changing's crystal 2, crystal temperature-controlling system 13, input cavity mirror 3 that present embodiment adopts are identical with embodiment 2 with output coupling mirror 4 filming parameters.
Difference is: it is the concave mirror of 200mm that input cavity mirror 3 and output coupling mirror 4 all adopt radius of curvature, and increases refrative cavity mirror 15 in addition, places with input cavity mirror 3 and output coupling mirror 4 and forms the V-type laserresonator.
With reference to Figure 10, make a kind of self frequency-changing's Q-switch solid laser based on the Nd:GdCOB crystal.
Pumping source 1, coupling unit 6, self frequency-changing's crystal 2, crystal temperature-controlling system 13, input cavity mirror 3 and the output coupling mirror 4 that present embodiment adopts, whole optical path are formed identical with embodiment 2.
Difference is: move behind output coupling mirror 4 placement locations, it is long to increase the laserresonator chamber, adds acoustooptic Q-switching 12 in the laserresonator and transfers Q.Can obtain the laser output of impulse form, thereby realize improving the purpose of peak power.
Claims (9)
1. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal comprises self frequency-changing's crystal, pumping source and laserresonator, it is characterized in that: described self frequency-changing's crystal is Nd
xGd
1-xCa
4O (BO
3)
3, x=0.001～0.2 wherein, the cut direction of this self frequency-changing's crystal is along perpendicular to this crystal frequency conversion phase matched direction cutting, the polishing of two logical light end faces; Described pumping source is the laser of wavelength at 802～815nm, 830nm or 868～887nm wave band; Described laserresonator is realized unity feedback to fundamental frequency light, and frequency conversion light is realized full output; Wherein, described pumping source output light path the place ahead is provided with laserresonator, settles described self frequency-changing's crystal in laserresonator, and pump mode is end pumping mode or profile pump mode.
2. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 1, it is characterized in that: also comprise a coupling unit, described coupling unit is arranged between described pumping source and the described input cavity mirror, described coupling unit is single coupled lens, or the coupled lens group.
3. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 1 is characterized in that: comprise that also one is used for Nd
xGd
1-xCa
4O (BO
3)
3The refrigeration temperature regulating device of self frequency-changing's crystal cooling, described refrigeration temperature regulating device is water-cooled or semiconductor TEC refrigerating system.
4. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 1 is characterized in that: described laserresonator has three types:
(1) described laserresonator is made of independently input cavity mirror and output cavity mirror, and wherein the self-frequency-doubling crystal two ends are not plated or plated pump light, fundamental frequency light and all anti-reflection rete of frequency conversion light;
(2) described laserresonator is exported as input cavity mirror and self-frequency-doubling crystal and on the light path of light an output cavity mirror is set and constitutes by directly plate the laser mirror film at self-frequency-doubling crystal's input end face; Or plate pump light, fundamental frequency light and all anti-reflection rete of frequency conversion light at self-frequency-doubling crystal's output end face;
(3) described laserresonator constitutes by directly all plating the laser mirror film at two end faces of laser crystal.
5. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 4, it is characterized in that: it is high saturating to pump light that described input cavity mirror or described self-frequency-doubling crystal's input end face plate anti-reflection rete, and fundamental frequency light and frequency doubled light are high anti-; Described output cavity mirror or described self-frequency-doubling crystal's output end face plated film are the high anti-and high saturating rete of frequency doubled light to fundamental frequency light, perhaps except that to the high anti-and frequency doubled light of fundamental frequency light high thoroughly, also to the anti-rete of pump light height.
6. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 4, it is characterized in that: described laserresonator also comprises refrative cavity, described refrative cavity is L die cavity or v-shaped cavity.
7. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 1 is characterized in that: described Nd
xGd
1-xCa
4O (BO
3)
3Self frequency-changing's crystal cuts along the optimum phase matching direction perpendicular on the primary flat or space up-conversion, and two logical light end faces perpendicular to this direction are carried out polishing; Wherein, the cross section of described logical light end face is circle, rectangle or ellipse, and optical direction thickness is 0.1～20mm.
8. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 1 is characterized in that: described pumping source is semiconductor laser, fiber laser or the tunable ti sapphire laser of photoflash lamp, single tube or modular form; Also comprise adopting and transfer Q, the laser that the general laser technology of locked mode realizes; The output form of pumping source is output continuously or pulse output; Pump mode is end pumping mode or profile pump mode.
9. the self frequency-changing's solid state laser based on neodymium-doped calcium oxygen gadolinium crystal as claimed in claim 1, it is characterized in that: the input cavity mirror of described laserresonator and the curvature of output cavity mirror or crystal input end face and output end face directly the curvature of processing at ± ∞ between ± the 50mm, thereby realize the different cavity type in average chamber, flat-concave cavity, plano-convex chamber, concavo-convex chamber, concavo-concave chamber or convexo-convex chamber.
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| Publication number | Priority date | Publication date | Assignee | Title |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1237655A (en) * | 1999-06-11 | 1999-12-08 | 山东大学 | Specially angle-cut boric acid oxygen calcium rare earth salt laser frequency doubling crystal |
| CN1320723A (en) * | 2001-02-23 | 2001-11-07 | 中国科学院上海硅酸盐研究所 | Technique for growing Nd-doped gadolinium calcium borate crystal by crucible lowering-down method |
| CN1566415A (en) * | 2003-07-10 | 2005-01-19 | 中国科学院福建物质结构研究所 | Neodymium-doped strontium-lanthanum borate ( Sr3La(BO3)3 ) laser crystal and its preparation method |
| CN1566414A (en) * | 2003-07-10 | 2005-01-19 | 中国科学院福建物质结构研究所 | Neodymium-doped strontium-yttrium borate ( Sr3Y(BO3)3 ) laser crystal and its preparation method |
| EP1067426B1 (en) * | 1998-03-27 | 2006-08-30 | Japan Science and Technology Agency | Wavelength conversion crystal and method for generating laser beam, and apparatus for generating laser beam |
| EP1709714A2 (en) * | 2004-01-20 | 2006-10-11 | Spectra-Physics, Inc. | Low-gain regenerative amplifier system |
| CN101237119A (en) * | 2008-01-23 | 2008-08-06 | 山东大学 | Nd YCOB crystal micro lens self-doubled frequency green laser |
-
2010
- 2010-04-09 CN CN 201010144564 patent/CN102074887A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1067426B1 (en) * | 1998-03-27 | 2006-08-30 | Japan Science and Technology Agency | Wavelength conversion crystal and method for generating laser beam, and apparatus for generating laser beam |
| CN1237655A (en) * | 1999-06-11 | 1999-12-08 | 山东大学 | Specially angle-cut boric acid oxygen calcium rare earth salt laser frequency doubling crystal |
| CN1320723A (en) * | 2001-02-23 | 2001-11-07 | 中国科学院上海硅酸盐研究所 | Technique for growing Nd-doped gadolinium calcium borate crystal by crucible lowering-down method |
| CN1566415A (en) * | 2003-07-10 | 2005-01-19 | 中国科学院福建物质结构研究所 | Neodymium-doped strontium-lanthanum borate ( Sr3La(BO3)3 ) laser crystal and its preparation method |
| CN1566414A (en) * | 2003-07-10 | 2005-01-19 | 中国科学院福建物质结构研究所 | Neodymium-doped strontium-yttrium borate ( Sr3Y(BO3)3 ) laser crystal and its preparation method |
| EP1709714A2 (en) * | 2004-01-20 | 2006-10-11 | Spectra-Physics, Inc. | Low-gain regenerative amplifier system |
| CN101237119A (en) * | 2008-01-23 | 2008-08-06 | 山东大学 | Nd YCOB crystal micro lens self-doubled frequency green laser |
Non-Patent Citations (1)
| Title |
|---|
| 《Optics Communications》 20010901 Xueyuan Chen, etc. Determination of the optimum phase-matching directions for the self-frequency conversion of Nd:GdCOB and Nd:YCOB crystals 1-9 第196卷, 第1-6期 * |
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| CN102593703A (en) * | 2012-01-16 | 2012-07-18 | 中国科学院理化技术研究所 | Device for judging optimal thermal balance running condition of self frequency conversion crystal |
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| CN102856786A (en) * | 2012-10-15 | 2013-01-02 | 青岛镭视光电科技有限公司 | Green laser based on calcium oxide borate salt crystal |
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Application publication date: 20110525 |