CN104638506A - 1.9-micron high-power prostate laser treatment instrument - Google Patents
1.9-micron high-power prostate laser treatment instrument Download PDFInfo
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- CN104638506A CN104638506A CN201510080083.4A CN201510080083A CN104638506A CN 104638506 A CN104638506 A CN 104638506A CN 201510080083 A CN201510080083 A CN 201510080083A CN 104638506 A CN104638506 A CN 104638506A
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Abstract
The invention discloses a 1.9-micron high-power prostate laser treatment instrument. A totally reflecting mirror, a transmission compensating device, a first optical fiber coupling lens, a gain fiber, a polarization-maintaining cladding power stripper, a second optical fiber coupling lens, an electro-optical modulation Q device, a third optical fiber coupling lens and an fiber grating are sequentially arranged on a laser path of the laser treatment instrument, wherein the head end of the gain fiber is sequentially fused with a pumping fiber optic combiner and a pumping source; the transmission compensating device is also connected to a power detecting device. Due to a special thermal depolarization compensating device, 1/4 wave plate and a Faraday rotator are screwed in or out of the laser path; the compensation can be implemented in different manners for different operation power, thereby greatly reducing the thermal depolarization loss of a fiber laser, greatly improving optical efficiency of the laser and optimizing the quality of laser beams.
Description
Technical field
The present invention relates to medical instruments field.More particularly, the present invention relates to a kind of 1.9 microns of high-power prostate laser therapeutic apparantus.
Background technology
Along with the process of aging society, patient is increasing for benign prostate hyperplasia (benign prostatic hyperplasia, BPH), and its incidence of disease increases with advancing age gradually.According to the report display of Urology Surgery research institute of Peking University, the BPH incidence of disease 61-70 year the male sex in reach in 50%, 71-80 years old male sex and reach 57.1%, 81-90 years old more up to 83.3%.At present, Transurethral prostatic electroresection A is still considered to the goldstandard of minimally-invasive treatment BPH, but the severe complications such as its postoperative easy appearance is hemorrhage, Electrotomy syndrome.2 μm of laser systems due to its wavelength and water to the maximum absorption band 1.94um of laser closely, it is nearly 4 times of Bladder stone to the absorptivity of water, therefore laser energy can fully by the moisture absorption in tissue, and form local peaks value energy, tissue can be vaporized instantaneously, cut.And 2um laser continuous wave mode of operation is better than the impulse wave mode of operation of Bladder stone, smooth-going vaporization+cutting makes the surface of a wound after removal tissue level and smooth, so be considered to optimal prostate treatment wave band.
Wherein, the laser of the exportable 1.65 ~ 2.1um wavelength of thulium-doped fiber laser, the widest in all rare earth ions, its relative solid state laser, have that structure is simple, efficiency is high, heat dissipation characteristics is good, narrow linewidth, quality for outputting laser beam advantages of higher, the thulium fiber laser that thus high peak power pulse exports obtained in recent years to be studied widely.But the operations such as the thulium-doped fiber laser near 2 μm cuts tissue, gasification need larger pulse energy, and its laser power provides primarily of the fibre core mixing thulium.But along with mixing the remarkable reinforcement of pumping optical power density in thulium gain fibre, there will be serious thermal effect, causing the phenomenons such as thermally induced birefringence, phase distortion, hot focus, thermal lens, having a strong impact on power output and the beam quality of laser.Along with the increase of draw power, the thermal effect of laser medium can be more and more significant, even can become the lethal factor that restriction laser performance improves.
Summary of the invention
An object of the present invention is to solve at least the problems referred to above and/or defect, and the advantage will illustrated at least is below provided.
A further object of the invention is to provide a kind of 1.9 microns of high-power prostate laser therapeutic apparantus, it can realize the 1.9um Output of laser of narrow spaces, high-peak power, the compensation of different modes can be carried out for different operate power simultaneously, solve thulium-doped fiber laser and occur the problem such as decrease in efficiency and beam quality variation in order to increase power, thus improve the light optical efficiency greatly improving laser, optimize beam quality.
In order to realize according to these objects of the present invention and other advantage, provide a kind of 1.9 microns of high-power prostate laser therapeutic apparantus, it is characterized in that, its laser optical path is disposed with: total reflective mirror, its surface is coated with the film that is all-trans of 1940nm; Transmission compensation arrangement, it comprises quarter wave plate, Faraday rotator and transmission device; First fiber coupling lens; Gain fibre, it comprises Uniform Doped has the fibre core of thulium, inner cladding, surrounding layer and strengthens coat, and the focus of described first fiber coupling lens is positioned at the first end of described gain fibre; Protect inclined covering power stripper, it is coated on the tail end of described gain fibre; Second coupling light lens, its focus is positioned at the breech face place of described gain fibre; Electric-optically Q-switched device, it comprises the polarizer and electro-optic Q-switched crystal, in order to the huge pulse wave of Output of laser; 3rd fiber coupling lens; And fiber grating, the wavelength of its reflection kernel is 1940nm, and the focus of described 3rd fiber coupling lens is positioned at the left side of described fiber grating;
Wherein, the head end of gain fibre also successively welding have pump optical fiber combiner, pumping source, described pump optical fiber combiner is conducive to high-power coupling pump light and enters gain fibre, reduces the heat that device produces, thus can complete powerful pumping.Described pumping source adopts output wavelength to be the semiconductor laser array of 798nm, in order to the light exciting described gain fibre to send 1940nm;
Wherein, described transmission compensation arrangement is also connected with power detection device, and described power detection device is in order to the power output of detection laser.
Preferably, wherein, the centre wavelength of described quarter wave plate is 1940nm, its orientation plays folk prescription to consistent with the described polarizer, passed through repeatedly to come and go by after quarter wave plate by the depolarization loss component polarization light compensated, major part energy can be converted into the polarised light that vibrates in main road and become effective Laser output, improves 2um Laser output efficiency, optimizes beam quality.
Preferably, wherein, the centre wavelength of described Faraday rotator is 1940nm, and it forces polarisation of light face is changed by external magnetic field, improves 2um Laser output efficiency, optimizes beam quality.
Preferably, wherein, described transmission device one end connects described quarter wave plate, the other end connects described Faraday rotator, described quarter wave plate can be shifted out laser optical path by described transmission device, described Faraday rotator is moved into laser optical path, described Faraday rotator can also be shifted out laser optical path by described transmission device simultaneously, described quarter wave plate is moved into laser optical path simultaneously.
Because quarter wave plate is to the compensation of hot depolarization, belong to non-fully and compensate, when laser output power is not too large, compensation effect is good, and laser power promotes obviously, but is increasing along with laser power, and it promotes effect and weakens gradually.And Faraday rotator is to the compensation of hot depolarization, belong to full remuneration, but be limited by the material behavior of current 2 mu m waveband Faraday rotators, its transmitance is lower, therefore its compensation effect not obvious at lower power, but in the process that laser power promotes gradually, its compensation effect promotes gradually.A critical power point is had in the process that laser power is changed from small to big, under different laser parameters, this critical power point is different, by to quarter wave plate and Faraday rotator, the compensation effect to hot depolarization measures respectively, the consistent power points of both compensation effects is critical power point.Described power detection device detection laser power output also judges, when power output is lower than critical power point, controlling transmission device moves in light path by quarter wave plate, when power output is higher than critical power point, controls transmission device and is moved in light path by Faraday rotator.The wherein said compensation effect to hot depolarization refers in light path to be put into before and after compensating device, the degree that laser output power promotes.
Preferably, wherein, the doping content of described thulium is 4 × 10
24~ 6 × 10
24m
-3, wherein m
-3be population density also known as volume number of particles, through 798nm wavelength pump light irradiate after, ground state
3h
6on thulium ion transit to
3h
4on energy level, when the concentration of thulium ion reach a certain height, close on may to occur between thulium ion cross relaxation (
3h
4→
3f
4,
3h
6→
3f
4), two thulium ions can be energized into by a pumping source photon
3f
4level, finally
3f
4thulium ion in level transits to the photon that ground state sends about 2um.Cross relaxation phenomenon can realize the reduction of laser threshold and the increase of the laser gain factor, effectively improves the efficiency of laser.The increase of thulium ion can strengthen this cross relaxation phenomenon, but the too high appearance that can cause again ion cluster of thulium ion, adulterate 4 × 10 in gain fibre of the present invention
24~ 6 × 10
24m
-3thulium can obtain higher lasing efficiency.
Preferably, wherein, the described polarizer is Glan prism, the one had in the white stone eyeglass heap of dichroism crystal or the placement in Brewster angle, in order to obtain polarised light.Described electro-optic Q-switched crystal is the one in High-doped Magnesium LiNbO_3 Crystal or callium-lanthanum silicate crystal.
Preferably, wherein, in described High-doped Magnesium LiNbO_3 Crystal, magnesian doping content is 5.1 % by weight, lithium columbate crystal optic damage threshold value can be made greatly to improve, can reach 200MW/cm
2above, it also avoid the light transmittance decline that too high magnesium oxide concentration causes simultaneously.
Preferably, wherein, described guarantor inclined covering power stripper is 20 ~ 30db to the degree of decay of transmission light in described inner cladding, and extinction ratio is greater than 18db, thus pump light residual in removal covering and be leaked to the ASE transmitted inner cladding from fibre core, reduce the damage to subsequent device.
The wavelength of described fiber grating reflection kernel is 1940nm, the transmissivity of described fiber grating within the scope of 1940 ± 60nm is 20 ~ 40%, the reflection bandwidth of described fiber grating is 0.5nm, described fiber grating and total reflective mirror form resonant cavity, by regulating the transmissivity of fiber grating pair 1940nm laser, the feedback to laser beam and acquisition Laser output can be formed, thus obtain optimum power output.
The present invention at least comprises following beneficial effect:
(1) the present invention is owing to having special thermal depolarization compensation device, by by quarter wave plate and Faraday rotator precession or screw out laser optical path, the compensation of different modes can be carried out for different operate power, greatly reduce the hot depolarization loss of fiber laser, significantly improve its light optical efficiency, optimize beam quality;
(2) the present invention is provided with at gain fibre output and protects inclined covering power stripper, it can ensure that fibre core exports on the basis of polarisation of light degree, power, beam quality, greatly dispel the residual pump light transmitted in covering and the amplified spontaneous emission light being leaked to covering from fibre core, thus greatly reduce the infringement to subsequent device;
(3) the present invention adopts the doping content of thulium in optical fiber to be 4 × 10
24~ 6 × 10
24m
-3the transmissivity of fiber grating within the scope of 1940 ± 60nm is 20 ~ 40%, the doping of suitable concn thulium can strengthen the cross relaxation phenomenon of energy inter-stage, and effectively shorten the length of gain fibre in laser, weaken because adopting long optical fibers matrix to the loss of laser, improve the quantum efficiency of laser, coordinate the fiber grating of suitable parameters to obtain optimum laser output power again, thus the performance of fiber laser can be significantly improved, to vaporize more efficiently the soft tissue of photocoagulation, improve the efficiency of laser surgey.
Part is embodied by explanation below by other advantage of the present invention, target and feature, part also will by research and practice of the present invention by those skilled in the art is understood.
Accompanying drawing explanation
Fig. 1 is the structural representation of 1.9 microns of described high-power prostate laser therapeutic apparantus of the present invention;
Fig. 2 is the structural representation of transmission compensation arrangement in one embodiment of the present of invention;
Fig. 3 is the structural representation of gain fibre of the present invention;
Fig. 4 is the output laser pulse energy under not compensating and adopt the present invention to carry out thermal depolarization compensation condition in one embodiment of the present of invention under different pumping energy.
In figure: 1, total reflective mirror, 2, transmission compensation arrangement, 3, power detection device, 4, the first fiber coupling lens, 5, pumping source, 6, pump optical fiber combiner, 7, gain fibre, 8, inclined covering power stripper is protected, the 9, second fiber coupling lens, 10, the polarizer, 11, electro-optic Q-switched crystal, 12, the 3rd fiber coupling lens, 13, fiber grating, 21, quarter wave plate, 22, the first adjustment rack, 23, Faraday rotator, the 24, second adjustment rack, 25, transmission device, 71, fibre core, 72, inner cladding, 73 surrounding layers, 74, strengthen coat.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to specification word to make those skilled in the art.
Should be appreciated that used hereinly such as " to have ", other element one or more do not allotted in " comprising " and " comprising " term or the existence of its combination or interpolation.
Fig. 1 shows according to a kind of way of realization of the present invention, and its laser optical path is disposed with:
Total reflective mirror 1, its surface is coated with the film that is all-trans of 1940nm, and this component is in order to improve the power output of laser;
Transmission compensation arrangement 2, it comprises quarter wave plate 21, Faraday rotator 23 and transmission device 25, and this component, in order to carry out thermal depolarization compensation, improves the light optical efficiency of laser, ensure that the beam quality of laser;
First fiber coupling lens 4;
Gain fibre 7, it comprises the fibre core 71 that Uniform Doped has thulium, inner cladding 72, surrounding layer 73 and enhancing coat 74, the focus of described first fiber coupling lens 4 is positioned at the first end of gain fibre 7, fibre core 71 reduces successively to the refractive index of surrounding layer 73, fibre core 71 absorbs the pump light entered, radiation laser is limited in transmission in fibre core 71, inner cladding 72 holds fibre core 71, laser emission is limited in fibre core 71, pump light is limited in inner cladding 72 by surrounding layer 73, the pump light be coupled in inner cladding 72 carries out roundtrip between inner cladding 72 and surrounding layer 73, through being repeatedly absorbed through fibre core 71, the outermost layer that gain coat 74 is coated in gain fibre 7 does not weather in order to protect optical fiber, scratch etc., and increase mechanical strength and the flexible of optical fiber 7,
Protect inclined covering power stripper 8, it is coated on the tail end of described gain fibre 7;
Second coupling light lens 4, its focus is positioned at the breech face place of gain fibre 7;
Electric-optically Q-switched device, it comprises the polarizer 10 and electro-optic Q-switched crystal 11, in order to Output of laser giant pulse;
3rd fiber coupling lens 12; And
Fiber grating 13, the wavelength of its reflection kernel is 1940nm, and the focus of described 3rd fiber coupling lens 12 is positioned at the left side of described fiber grating 13;
Wherein, the head end of gain fibre 7 also successively welding have pump optical fiber combiner 6, pumping source 5, in order to ensure the carrying out of high power pumping.Described pumping source 5 adopts out wavelength to be the semiconductor laser array of 798nm, and in described gain fibre 7, the thulium ion of doping effectively can absorb the pumping light of 798nm, from ground state
3h
6energy level transition arrives
3h
4on energy level.There is very strong spontaneous radiation in high level particle, when the concentration of thulium ion reach a certain height, close on may to occur between thulium ion cross relaxation (
3h
4→
3f
4,
3h
6→
3f
4), two thulium ions can be energized into by a pumping source photon
3f
4level, finally
3f
4thulium ion in level transits to the photon that ground state releases about 2um;
Wherein, described transmission compensation arrangement 2 is also connected with power detection device 3, and described power detection device 3 is in order to the power output of detection laser.
A kind of implementation of the quarter wave plate 21 in such scheme is: described quarter wave plate 21 centre wavelength is 1940nm, its orientation plays folk prescription to consistent with the described polarizer 10, sheet loss component polarization light is moved back by repeatedly coming and going by after quarter wave plate 21 by what compensate, major part energy can be converted into the polarised light that vibrates in main road and become effective Laser output, the 2um laser beam quality of raising.
A kind of implementation of the Faraday rotator 23 in such scheme is: the centre wavelength of described Faraday rotator 23 is 1940nm, and it forces polarisation of light face is changed by external magnetic field, improves the Laser output efficiency of 2um.
A kind of implementation of the transmission compensation arrangement 2 in such scheme is: described transmission device 25 one end is fixed with described quarter wave plate 21 by the first adjustment rack 22, the other end is fixed with described Faraday rotator 23 by the second adjustment rack 24, described quarter wave plate 21 can be shifted out laser optical path by described transmission device 25, described Faraday rotator 23 is moved into laser optical path simultaneously, described Faraday rotator 23 can also be shifted out laser optical path by described transmission device 25, described quarter wave plate 21 is moved into laser optical path simultaneously.
Because quarter wave plate 21 is to the compensation of hot depolarization, belong to non-fully and compensate, when laser output power is not too large, compensation effect is good, and laser power promotes obviously, but is increasing along with laser power, and it promotes effect and weakens gradually.And Faraday rotator 23 is to the compensation of hot depolarization, belong to full remuneration, but be limited by the material behavior of current 2 mu m waveband Faraday rotators, its transmitance is lower, therefore its compensation effect not obvious at lower power, but in the process that laser power promotes gradually, its compensation effect promotes gradually.A critical power point is had in the process that laser power is changed from small to big, under different laser parameters, this critical power point is different, by to quarter wave plate and Faraday rotator, the compensation effect to hot depolarization measures respectively, the consistent power points of both compensation effects is critical power point.Described power detection device 3 detection laser power output also judges, when power output is lower than critical power point, controlling transmission device 25 moves in light path by quarter wave plate 21, when power output is higher than critical power point, controls transmission device 25 and is moved in light path by Faraday rotator 23.The wherein said compensation effect to hot depolarization refers in light path to be put into before and after compensating device, the degree that laser output power promotes.
In such scheme, the doping content of thulium is 4 × 10
24~ 6 × 10
24m
-3, cross relaxation (
3h
4→
3f
4,
3h
6→
3f
4) probability that occurs increases with the increase of thulium ion doping content, thus can realize the reduction of laser threshold and the increase of the laser gain factor, effectively can improve the efficiency of laser.In addition, the increase of thulium concentration effectively can shorten the length of gain fibre, reduces the absorption of matrix to pump light and flashlight, improves efficiency of laser, but the too high appearance that can cause again ion cluster of thulium ion simultaneously.In the present invention, verify by experiment, in optical fiber, adulterate 4 × 10
24~ 6 × 10
24m
-3thulium can obtain higher lasing efficiency.
In such scheme, the described polarizer 10 comprises multiple way of realization, and such as the polarizer 10 can be Glan prism, the one had in the white stone eyeglass heap of dichroism crystal or the placement in Brewster angle, in order to obtain polarised light.Described electro-optic Q-switched crystal 11 also comprises multiple way of realization, and such as electro-optic Q-switched crystal 11 can be the one in High-doped Magnesium LiNbO_3 Crystal or callium-lanthanum silicate crystal.Wherein, in described High-doped Magnesium LiNbO_3 Crystal, magnesian doping content is 5.1 % by weight, lithium columbate crystal optic damage threshold value can be made greatly to improve, can reach 200MW/cm
2above, its light transmission rate can reach 98% after plated film simultaneously, also can satisfy the demand, can adapt to high-power 2 μm of Laser outputs.
In such scheme, described guarantor inclined covering power stripper 8 is 20 ~ 30db to the degree of decay of transmission light in described inner cladding 72, extinction ratio is greater than 18db, the light of inner cladding numerical aperture 0.46 large in gain fibre 7 described in Absorbable rod and little fibre core numerical aperture 0.09 waveguide, and in fibre core 71, the light of the 1.94um of transmission can well be kept.Described guarantor inclined covering power stripper 8 is under heat sink heat radiation, and its power handling capability is greater than 200W, thus realizes, to pump light residual in covering and the decay being leaked to the ASE inner cladding from fibre core, reducing the damage to subsequent device.
In such scheme, the wavelength of described fiber grating 13 reflection kernel is 1940nm, and the transmissivity of described fiber grating 13 within the scope of 1940 ± 60nm is 20 ~ 40%, and the reflection bandwidth of described fiber grating 13 is 0.5nm.Described fiber grating 13 and total reflective mirror 1 form resonant cavity, by regulating the transmissivity of fiber grating 13 pairs of 1940nm laser, can form the feedback to laser beam and acquisition Laser output, thus obtaining optimum power output.
Fig. 4 shows under different pump pulse energy, laser is not compensating and the pulsed laser energy that exports in compensation method situation of the present invention respectively, can find out and adopt method of the present invention to carry out to laser machine the loss that thermal depolarization compensation significantly reduces laser, improve the output energy of laser.When pump power is 600w, before and after compensating, Laser output pulse energy is respectively 342uJ and 472uJ, improves 38.01%.
Here the number of devices illustrated and treatment scale are used to simplify explanation of the present invention.The application of 1.9 microns of high-power prostate laser therapeutic apparantus of the present invention, modifications and variations be will be readily apparent to persons skilled in the art.
As mentioned above, according to the present invention, owing to having special thermal depolarization compensation device, by by quarter wave plate and Faraday rotator precession or screw out laser optical path, the compensation of different modes can be carried out for different operate power, greatly reduce the hot depolarization loss of fiber laser, significantly improve its light optical efficiency, optimize beam quality;
In addition, the present invention is provided with at gain fibre output and protects inclined covering power stripper, it can ensure that fibre core exports on the basis of polarisation of light degree, power, beam quality, greatly dispel the residual pump light transmitted in covering and the amplified spontaneous emission light being leaked to covering from fibre core, thus greatly reduce the infringement to subsequent device;
In addition the present invention adopts the doping content of thulium in optical fiber to be 4 × 10
24~ 6 × 10
24m
-3the transmissivity of fiber grating within the scope of 1940 ± 60nm is 20 ~ 40%, the doping of suitable concn thulium can strengthen the cross relaxation phenomenon of energy inter-stage, and effectively shorten the length of gain fibre in laser, weaken because adopting long optical fibers matrix to the loss of laser, improve the quantum efficiency of laser, coordinate the fiber grating of suitable parameters can obtain the 1.9um laser output power of 120 ~ 150W again, thus the performance of fiber laser can be significantly improved, to vaporize more efficiently the soft tissue of photocoagulation, improve the efficiency of laser surgey.
Although embodiment of the present invention are open as above, it is not restricted to listed in specification and execution mode utilization.It can be applied to various applicable the field of the invention completely.For those skilled in the art, can easily realize other amendment.Therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (9)
1. 9 microns of high-power prostate laser therapeutic apparantus, is characterized in that, its laser optical path is disposed with:
Total reflective mirror, its surface is coated with the film that is all-trans of 1940nm;
Transmission compensation arrangement, it comprises quarter wave plate, Faraday rotator and transmission device;
First fiber coupling lens;
Gain fibre, it comprises Uniform Doped has the fibre core of thulium, inner cladding, surrounding layer and strengthens coat, and the focus of described first fiber coupling lens is positioned at the first end of described gain fibre;
Protect inclined covering power stripper, it is coated on the tail end of described gain fibre;
Second coupling light lens, its focus is positioned at the breech face place of described gain fibre;
Electric-optically Q-switched device, it comprises the polarizer and electro-optic Q-switched crystal, in order to Output of laser giant pulse;
3rd fiber coupling lens; And
Fiber grating, the wavelength of its reflection kernel is 1940nm, and the focus of described 3rd fiber coupling lens is positioned at the left side of described fiber grating;
Wherein, the head end of gain fibre also successively welding have pump optical fiber combiner, pumping source, described pumping source adopts output wavelength to be the semiconductor laser array of 798nm, in order to the light exciting described gain fibre to send 1940nm;
Wherein, described transmission compensation arrangement is also connected with power detection device, and described power detection device is in order to the power output of detection laser.
2. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, is characterized in that, the centre wavelength of described quarter wave plate is 1940nm, and its orientation plays folk prescription to consistent with the described polarizer.
3. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, is characterized in that, the centre wavelength of described Faraday rotator is 1940nm.
4. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterized in that, described transmission device one end connects described quarter wave plate, the other end connects described Faraday rotator, described quarter wave plate can be shifted out laser optical path by described transmission device, described Faraday rotator is moved into laser optical path, described Faraday rotator can also be shifted out laser optical path by described transmission device simultaneously, described quarter wave plate is moved into laser optical path simultaneously.
5. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, is characterized in that, the thulium concentration of mixing of described fibre core is 4 × 10
24~ 6 × 10
24m
-3.
6. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterized in that, the described polarizer is Glan prism, have dichroism crystal or one in the white stone eyeglass heap placed in Brewster angle, and described electro-optic Q-switched crystal is the one in High-doped Magnesium LiNbO_3 Crystal or callium-lanthanum silicate crystal.
7. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 6, it is characterized in that, in described High-doped Magnesium LiNbO_3 Crystal, magnesian doping content is 5.1 % by weight.
8. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, is characterized in that, described guarantor inclined covering power stripper is 20 ~ 30db to the degree of decay of transmission light in described inner cladding, and extinction ratio is greater than 18db.
9. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterized in that, the wavelength of described fiber grating reflection kernel is 1940nm, and the transmissivity of described fiber grating within the scope of 1940 ± 60nm is 20 ~ 40%, and the reflection bandwidth of described fiber grating is 0.5nm.
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| CN105435374A (en) * | 2015-12-18 | 2016-03-30 | 西安炬光科技股份有限公司 | Semiconductor laser medical device based on optical fiber coupling module |
| CN114256725A (en) * | 2021-12-23 | 2022-03-29 | 湖北久之洋信息科技有限公司 | External cavity feedback type all-fiber cavity emptying laser |
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