CN104638506B - A kind of 1.9 microns of high-power prostate laser therapeutic apparantus - Google Patents
A kind of 1.9 microns of high-power prostate laser therapeutic apparantus Download PDFInfo
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- CN104638506B CN104638506B CN201510080083.4A CN201510080083A CN104638506B CN 104638506 B CN104638506 B CN 104638506B CN 201510080083 A CN201510080083 A CN 201510080083A CN 104638506 B CN104638506 B CN 104638506B
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Abstract
The invention discloses a kind of 1.9 microns of high-power medical apparatus for treating prostatic diseases, total reflective mirror, transmission compensation device, the first fiber coupling lens, gain fibre, polarization-maintaining Cladding Power Stripper, the second light coupled lens, electric-optically Q-switched device, the 3rd fiber coupling lens and fiber grating are disposed with its laser optical path, wherein, also welding has pump optical fiber combiner, pumping source to the head end of gain fibre successively；The transmission compensation device is also associated with power detection device.The present invention is due to special thermal depolarization compensation device, by by quarter wave plate and Faraday rotator precession or screw out laser optical path, the compensation that different operation power carry out different modes can be directed to, greatly reduce the hot depolarization loss of optical fiber laser, its light light efficiency is greatly improved, optimizes beam quality.
Description
Technical field
The present invention relates to medical instruments field.It is more particularly related to a kind of 1.9 microns of high-power prostates swash
Photo-therapeutic instrument.
Background technology
With the process of aging society, benign prostate hyperplasia (benign prostatic hyperplasia,
BPH) patient is increasing, and its incidence of disease gradually increases with advancing age.Reported according to Urology Surgery research institute of Peking University
Accuse display, the BPH incidences of disease are in the male of 61-70 year up to being more up to up to 57.1%, 81-90 year in 50%, 71-80 year male
83.3%.At present, Transurethral prostatic electroresection A is still considered as minimally-invasive treatment BPH goldstandard, but its postoperative is easily showed
The severe complications such as blood, Electrotomy syndrome.2 μm of laser systems are non-to the maximum absorption band 1.94um of laser due to its wavelength and water
Very close to its absorptivity to water is nearly 4 times of Bladder stone, therefore laser energy can be fully by the moisture absorption in tissue, shape
Into local peaks value energy, tissue can be vaporized, cuts moment.And 2um laser continuous waves mode of operation is better than the arteries and veins of Bladder stone
Ripple mode of operation is rushed, vaporization+cutting of smooth-going makes the surface of a wound after removal tissue smooth, so be considered as optimal prostate
Treat wave band.
Wherein, the laser of the exportable 1.65~2.1um wavelength of thulium-doped fiber laser, is most wide in all rare earth ions
, for its relative solid state laser, there is good simple in construction, efficiency high, heat dissipation characteristics, narrow linewidth, output laser beam matter
Measure the advantages that high, thus the thulium optical fiber laser of high peak power pulse output had obtained extensive research in recent years.But 2 μm attached
Near thulium-doped fiber laser cut to tissue, the operation such as vaporizes needs larger pulse energy, and its laser power is main
There is provided by the fibre core for mixing thulium.But with the notable reinforcement for mixing pumping optical power density in thulium gain fibre, it may appear that serious heat
Effect, phenomena such as causing thermally induced birefringence, phase distortion, hot focus, thermal lens, have a strong impact on the power output and light beam of laser
Quality.With the increase of draw power, the fuel factor of laser medium can be more and more significant, or even can turn into limitation laser performance
The lethal factor improved.
The content of the invention
It is an object of the invention to solve at least the above and/or defect, and provide at least will be described later it is excellent
Point.
It is a still further object of the present invention to provide a kind of 1.9 microns of high-power prostate laser therapeutic apparantus, it can be realized
The 1.9um output laser of narrow spaces, high-peak power, while the compensation that different operation power carry out different modes can be directed to,
Solve thulium-doped fiber laser and occur the problems such as efficiency decline and beam quality variation in order to increase power, so as to greatly improve
The light light efficiency of laser, optimizes beam quality.
In order to realize according to object of the present invention and further advantage, there is provided a kind of 1.9 microns of high-power prostates
Laser therapeutic apparantus, it is characterised in that be disposed with its laser optical path：Total reflective mirror, its surface are coated with the 1940nm film that is all-trans；
Compensation device is driven, it includes quarter wave plate, Faraday rotator and transmission device；First fiber coupling lens；Gain fibre,
It includes fibre core, inner cladding, surrounding layer and the enhancing coat that Uniform Doped has thulium, the focus of first fiber coupling lens
Positioned at the first end of the gain fibre；Polarization-maintaining Cladding Power Stripper, it is coated on the tail end of the gain fibre；Second
Light coupled lens, its focus are located at the breech face of the gain fibre；Electric-optically Q-switched device, it includes the polarizer and electric light
Adjusting Q crystal, to export the huge pulse wave of laser；3rd fiber coupling lens；And fiber grating, the wavelength of its reflection kernel are
1940nm, the focus of the 3rd fiber coupling lens are located at the left side of the fiber grating；
Wherein, also welding has pump optical fiber combiner, pumping source to the head end of gain fibre successively, and the pumping optical fiber closes beam
Device is advantageous to high-power coupling pump light and enters gain fibre, reduces heat caused by device, high-power so as to complete
Pumping.The pumping source uses semiconductor laser array of the output wavelength for 798nm, to excite the gain fibre to send
1940nm light；
Wherein, the transmission compensation device is also associated with power detection device, and the power detection device is sharp to detect
The power output of light.
Preferably, wherein, the centre wavelength of the quarter wave plate is 1940nm, and its orientation is polarized with the polarizer
Direction is consistent, and the depolarization loss component polarization light compensated is by the way that after repeatedly coming and going and passing through quarter wave plate, most of energy can be by
It is converted into the polarised light that is vibrated in main road and is exported as effective laser, improves 2um laser delivery efficiencies, optimize light beam matter
Amount.
Preferably, wherein, the centre wavelength of the Faraday rotator is 1940nm, and it is forced by external magnetic field
The plane of polarization of light is changed, improve 2um laser delivery efficiencies, optimize beam quality.
Preferably, wherein, described transmission device one end connects the quarter wave plate, and the other end connects faraday's rotation
Turn device, the transmission device can remove the quarter wave plate laser optical path, while the Faraday rotator is moved into laser light
Road, the transmission device can also remove the Faraday rotator laser optical path, while the quarter wave plate is moved into laser
Light path.
Due to compensation of the quarter wave plate to hot depolarization, belong to and non-fully compensate, in the case where laser output power is less big
Compensation effect is good, and laser power lifting is obvious, but increases with laser power, and it lifts effect and gradually weakened.And farad
Compensation of the circulator to hot depolarization, belong to full remuneration, but the material for being limited by current 2 mu m waveband Faraday rotator is special
Property, its transmitance is relatively low, therefore its compensation effect and unobvious, but the process lifted gradually in laser power at lower power
In, its compensation effect is gradually lifted.There are a critical power point, different laser ginseng during laser power is changed from small to big
Several lower critical power points are different, can be by being carried out respectively to quarter wave plate and Faraday rotator to the compensation effect of hot depolarization
Measure, the consistent power points of both compensation effects is critical power point.The power detection device detects laser output power
And judge, when power output is less than critical power point, control transmission device moves into quarter wave plate in light path, works as output
When power is higher than critical power point, control transmission device moves into Faraday rotator in light path.It is wherein described to hot depolarization
Compensation effect refers to be put into before and after compensating device in light path, the degree of laser output power lifting.
Preferably, wherein, the doping concentration of the thulium is 4 × 1024~6 × 1024m-3, wherein m-3It is population density
Also known as volume number of particles, after the pumping light irradiation of 798nm wavelength, ground state3H6On thulium ion transit to3H4On energy level, work as thulium
When the concentration of ion reach a certain height, close between thulium ion may occur cross relaxation (3H4→3F4,3H6→3F4), one
Two thulium ions can be energized into by individual pumping source photon3F4Level, finally3F4Thulium ion in level transits to ground state and sends a 2um left sides
Right photon.Cross relaxation phenomenon can realize the reduction of laser threshold and the increase of the laser gain factor, effectively improve
The efficiency of laser.The increase of thulium ion can strengthen this cross relaxation phenomenon, but thulium ion is too high and can cause ion cluster
Appearance, 4 × 10 are adulterated in gain fibre of the present invention24~6 × 1024m-3The available higher lasing efficiency of thulium.
Preferably, wherein, the polarizer is Glan prism, has dichroism crystal or placed in Brewster angle
White stone eyeglass heap in one kind, to obtain polarised light.The electro-optic Q-switched crystal is High-doped Magnesium LiNbO_3 Crystal or silicic acid
One kind in gallium lanthanum crystal.
Preferably, wherein, the doping concentration of magnesia is 5.1 weight % in the High-doped Magnesium LiNbO_3 Crystal, can be with
Greatly improve lithium columbate crystal optic damage threshold value, up to 200MW/cm2More than, while it is dense to it also avoid too high magnesia
Light transmittance caused by degree declines.
Preferably, wherein, the polarization-maintaining Cladding Power Stripper is 20 to the dough softening of transmission light in the inner cladding
~30db, extinction ratio are more than 18db, so as to remove the pump light that is remained in covering and be leaked to what is transmitted in inner cladding from fibre core
ASE, reduce the damage to subsequent device.
The wavelength of the fiber grating reflection kernel is 1940nm, and the fiber grating is saturating in the range of 1940 ± 60nm
It is 20~40% to penetrate rate, and the reflection bandwidth of the fiber grating is 0.5nm, and the fiber grating and total reflective mirror form resonator,
By adjusting the transmissivity of fiber grating pair 1940nm laser, the feedback to laser beam and acquisition laser output can be formed, so as to
Obtain optimal power output.
The present invention comprises at least following beneficial effect：
(1) present invention is due to special thermal depolarization compensation device, by by quarter wave plate and Faraday rotator precession
Or laser optical path is screwed out, the compensation that different operation power carry out different modes can be directed to, greatly reduces optical fiber laser
Hot depolarization loss, greatly improves its light light efficiency, optimizes beam quality；
(2) present invention is provided with polarization-maintaining Cladding Power Stripper in gain fibre output end, and it can ensure that fibre core is defeated
On the basis of the degree of polarization of light extraction, power, beam quality, the residual pump light transmitted in covering is dispelled significantly and is let out from fibre core
Reveal the amplified spontaneous emission light of covering, so as to greatly reduce the infringement to subsequent device；
(3) present invention uses the doping concentration of thulium in optical fiber as 4 × 1024~6 × 1024m-3, fiber grating 1940 ±
Transmissivity in the range of 60nm is 20~40%, and the doping of suitable concn thulium can strengthen the cross relaxation phenomenon between energy level, and have
Effect shortens the length of gain fibre in laser, weakens the loss because using long optical fibers matrix to laser, improves the amount of laser
Sub- efficiency, then coordinate the fiber grating of suitable parameters to swash to obtain optimal laser output power so as to significantly improve optical fiber
The performance of light device, the soft tissue of more efficient vaporization photocoagulation, improve the efficiency of laser surgey.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the structural representation of the high-power prostate laser therapeutic apparantus in described 1.9 micron of the present invention；
Fig. 2 is the structural representation that compensation device is driven in one embodiment of the present of invention；
Fig. 3 is the structural representation of gain fibre of the present invention；
Fig. 4 is not compensated under different pumping energies in one embodiment of the present of invention and carry out hot depolarization using the present invention
Output laser pulse energy under compensation condition.
In figure：1st, total reflective mirror, 2, transmission compensation device, 3, power detection device, the 4, first fiber coupling lens, 5, pumping
Source, 6, pump optical fiber combiner, 7, gain fibre, 8, polarization-maintaining Cladding Power Stripper, the 9, second fiber coupling lens, 10, rise
Inclined device, 11, electro-optic Q-switched crystal, the 12, the 3rd fiber coupling lens, 13, fiber grating, 21, quarter wave plate, the 22, first adjustment frame,
23rd, Faraday rotator, the 24, second adjustment frame, 25, transmission device, 71, fibre core, 72, inner cladding, 73 surrounding layers, 74, enhancing
Coat.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of individual other elements or its combination.
Fig. 1 shows a kind of way of realization according to the present invention, is disposed with its laser optical path：
Total reflective mirror 1, its surface are coated with the 1940nm film that is all-trans, and the component is improving the power output of laser；
Compensation device 2 is driven, it includes quarter wave plate 21, Faraday rotator 23 and transmission device 25, and the component is entering
Row thermal depolarization compensation, the light light efficiency of laser is improved, ensure that the beam quality of laser；
First fiber coupling lens 4；
Gain fibre 7, it includes fibre core 71, inner cladding 72, surrounding layer 73 and the enhancing coat 74 that Uniform Doped has thulium,
The focus of first fiber coupling lens 4 is located at the first end of gain fibre 7, the refractive index of fibre core 71 to surrounding layer 73 according to
Secondary reduction, the pump light that fibre core 71 is absorbed into, radiation laser is limited in fibre core 71 and transmitted, inner cladding 72 wraps fibre core
71, laser emission is limited in fibre core 71, pump light is limited in inner cladding 72 by surrounding layer 73, is coupled in inner cladding 72
Pump light roundtrip is carried out between inner cladding 72 and surrounding layer 73, through repeatedly through fibre core 71 and be absorbed, gain
Outermost layer of the coat 74 coated in gain fibre 7 increases the machinery of optical fiber 7 to protect optical fiber not weather, abrade
Intensity and flexible；
Polarization-maintaining Cladding Power Stripper 8, it is coated on the tail end of the gain fibre 7；
Second light coupled lens 4, its focus are located at the breech face of gain fibre 7；
Electric-optically Q-switched device, it includes the polarizer 10 and electro-optic Q-switched crystal 11, to export laser giant-pulse；
3rd fiber coupling lens 12；And
Fiber grating 13, the wavelength of its reflection kernel is 1940nm, and the focus of the 3rd fiber coupling lens 12 is located at
The left side of the fiber grating 13；
Wherein, also welding has pump optical fiber combiner 6, pumping source 5 to the head end of gain fibre 7 successively, to ensure big work(
The progress of rate pumping.The pumping source 5 uses out semiconductor laser array of the wavelength for 798nm, is adulterated in the gain fibre 7
Thulium ion can effectively absorb 798nm pumping light, from ground state3H6Energy level transition arrives3H4On energy level.High level particle is present very
Strong spontaneous radiation, when the concentration of thulium ion reach a certain height, close between thulium ion may occur cross relaxation (3H4
→3F4,3H6→3F4), two thulium ions can be energized into by a pumping source photon3F4Level, finally3F4Thulium ion jump in level
Adjourn the photon that ground state releases 2um or so；
Wherein, the transmission compensation device 2 is also associated with power detection device 3, and the power detection device 3 is detecting
The power output of laser.
One kind of quarter wave plate 21 in such scheme is achieved in that：The centre wavelength of quarter wave plate 21 is 1940nm,
It is orientated is polarized that direction is consistent with the polarizer 10, and the piece loss component polarization light that moves back compensated passed through by repeatedly round
After quarter wave plate 21, most of energy can be converted into the polarised light vibrated in main road and be exported as effective laser, improve
2um laser beam qualities.
One kind of Faraday rotator 23 in such scheme is achieved in that：The middle cardiac wave of the Faraday rotator 23
A length of 1940nm, it forces to make the plane of polarization of light change by external magnetic field, improves 2um laser delivery efficiency.
One kind of transmission compensation device 2 in such scheme is achieved in that：Described one end of transmission device 25 passes through first
Adjustment frame 22 is fixed with the quarter wave plate 21, and the other end is fixed with the Faraday rotator 23, institute by the second adjustment frame 24
The quarter wave plate 21 can be removed laser optical path by stating transmission device 25, while the Faraday rotator 23 is moved into laser light
Road, the transmission device 25 can also remove the Faraday rotator 23 laser optical path, while the quarter wave plate 21 is moved
Enter laser optical path.
Due to compensation of the quarter wave plate 21 to hot depolarization, belong to and non-fully compensate, in the less big situation of laser output power
Lower compensation effect is good, and laser power lifting is obvious, but increases with laser power, and it lifts effect and gradually weakened.And method
Compensation of the circulator 23 to hot depolarization is drawn, belongs to full remuneration, but is limited by the material of current 2 mu m waveband Faraday rotator
Expect characteristic, its transmitance is relatively low, therefore its compensation effect and unobvious, but the mistake lifted gradually in laser power at lower power
Cheng Zhong, its compensation effect are gradually lifted.There are a critical power point, different laser during laser power is changed from small to big
The critical power point is different under parameter, can be by entering respectively to quarter wave plate and Faraday rotator to the compensation effect of hot depolarization
Row measure, the consistent power points of both compensation effects is critical power point.The power detection device 3 detects laser output work
Rate simultaneously judges, and when power output is less than critical power point, control transmission device 25 moves into quarter wave plate 21 in light path,
When power output is higher than critical power point, control transmission device 25 moves into Faraday rotator 23 in light path.It is wherein described
The compensation effect of hot depolarization is referred to before and after being put into compensating device in light path, the degree of laser output power lifting.
The doping concentration of thulium is 4 × 10 in such scheme24~6 × 1024m-3, cross relaxation (3H4→3F4,3H6→3F4) go out
Existing probability increases with the increase of thulium ion doping concentration, so as to realize the reduction of laser threshold and laser gain
The increase of the factor, the efficiency of laser can be effectively improved.In addition, the increase of thulium concentration can effectively shorten the length of gain fibre,
Absorption of the matrix to pump light and flashlight is reduced, improves efficiency of laser, but thulium ion is too high simultaneously and can cause ion cluster
The appearance of cluster.In the present invention, by experimental verification, 4 × 10 are adulterated in optical fiber24~6 × 1024m-3Thulium it is available higher
Lasing efficiency.
In such scheme, the polarizer 10 includes a variety of ways of realization, for example, the polarizer 10 can be Glan prism,
With dichroism crystal or in one kind in the white stone eyeglass heap of Brewster angle placement, to obtain polarised light.It is described
Electro-optic Q-switched crystal 11 also includes a variety of ways of realization, such as electro-optic Q-switched crystal 11 can be High-doped Magnesium LiNbO_3 Crystal or silicic acid
One kind in gallium lanthanum crystal.Wherein, the doping concentration of magnesia is 5.1 weight % in the High-doped Magnesium LiNbO_3 Crystal, can be with
Greatly improve lithium columbate crystal optic damage threshold value, up to 200MW/cm2More than, while its light transmission rate is reachable after plated film
98%, it can also meet needs, can adapt to high-power 2 μm of laser output.
In such scheme, the polarization-maintaining Cladding Power Stripper 8 is 20 to the dough softening of transmission light in the inner cladding 72
~30db, extinction ratio are more than 18db, can absorb big inner cladding numerical aperture 0.46 and small fibre core number in the gain fibre 7
It is worth the light of the waveguide transmission of aperture 0.09, and the 1.94um transmitted in fibre core 71 light can be kept well.The polarization-maintaining covering
For power stripper 8 under heat sink radiating, its power handling capability is more than 200W, so as to realizing to the pump light that is remained in covering and
The decay for the ASE being leaked to from fibre core in inner cladding, reduce the damage to subsequent device.
In such scheme, the wavelength of the reflection kernel of fiber grating 13 is 1940nm, and the fiber grating 13 is 1940
Transmissivity in the range of ± 60nm is 20~40%, and the reflection bandwidth of the fiber grating 13 is 0.5nm.The fiber grating 13
Resonator is formed with total reflective mirror 1, by adjusting transmissivity of the fiber grating 13 to 1940nm laser, can be formed to the anti-of laser beam
Feedback and acquisition laser output, so as to obtain optimal power output.
Fig. 4 shows that under different pump pulse energy laser is not compensating and compensation method situation of the present invention respectively
The pulsed laser energy of lower output, it can be seen that thermal depolarization compensation is carried out to laser machine using the method for the present invention and significantly reduced
The loss of laser, improve the output energy of laser.In the case where pump power is 600w, laser exports arteries and veins before and after compensation
It is respectively 342uJ and 472uJ to rush energy, improves 38.01%.
Number of devices and treatment scale described herein are the explanations for simplifying the present invention.It is micro- to the 1.9 of the present invention
The application of the high-power prostate laser therapeutic apparantus of rice, modifications and variations will be readily apparent to persons skilled in the art.
As described above, according to the present invention, due to special thermal depolarization compensation device, by by quarter wave plate and farad
Circulator precession screws out laser optical path, can be directed to the compensation that different operation power carry out different modes, greatly reduce
The hot depolarization loss of optical fiber laser, greatly improves its light light efficiency, optimizes beam quality；
In addition, the present invention is provided with polarization-maintaining Cladding Power Stripper in gain fibre output end, it can ensure fibre core
On the basis of the degree of polarization of output light, power, beam quality, the residual pump light that is transmitted in covering is dispelled significantly and from fibre core
The amplified spontaneous emission light of covering is leaked to, so as to greatly reduce the infringement to subsequent device；
In addition the present invention uses the doping concentration of thulium in optical fiber as 4 × 1024~6 × 1024m-3, fiber grating 1940 ±
Transmissivity in the range of 60nm is 20~40%, and the doping of suitable concn thulium can strengthen the cross relaxation phenomenon between energy level, and have
Effect shortens the length of gain fibre in laser, weakens the loss because using long optical fibers matrix to laser, improves the amount of laser
Sub- efficiency, then coordinate the fiber grating of suitable parameters to obtain 120~150W 1.9um laser output powers, so as to obvious
Improve the performance of optical fiber laser, the soft tissue of more efficient vaporization photocoagulation, improve the efficiency of laser surgey.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With.It can be applied to various suitable the field of the invention completely., can be easily for those skilled in the art
Realize other modification.Therefore it is of the invention and unlimited under the universal limited without departing substantially from claim and equivalency range
In specific details and shown here as the legend with description.
Claims (9)
1. a kind of 1.9 microns of high-power prostate laser therapeutic apparantus, it is characterised in that be disposed with its laser optical path：
Total reflective mirror, its surface are coated with the 1940nm film that is all-trans；
Compensation device is driven, it includes quarter wave plate, Faraday rotator and transmission device；
First fiber coupling lens；
Gain fibre, it includes fibre core, inner cladding, surrounding layer and the enhancing coat that Uniform Doped has thulium, first optical fiber
The focus of coupled lens is located at the first end of the gain fibre；
Polarization-maintaining Cladding Power Stripper, it is coated on the tail end of the gain fibre；
Second fiber coupling lens, its focus are located at the breech face of the gain fibre；
Electric-optically Q-switched device, it includes the polarizer and electro-optic Q-switched crystal, to export laser giant-pulse；
3rd fiber coupling lens；And
Fiber grating, the wavelength of its reflection kernel is 1940nm, and the focus of the 3rd fiber coupling lens is located at the optical fiber
The left side of grating；
Wherein, also welding has pump optical fiber combiner, pumping source to the head end of gain fibre successively, and the pumping source uses output wave
A length of 798nm semiconductor laser array, to excite the gain fibre to send 1940nm light；
Wherein, the transmission compensation device is also associated with power detection device, and the power detection device is detecting laser
Power output.
2. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterised in that the quarter wave plate
Centre wavelength is 1940nm, its be orientated with the polarizer to be polarized direction consistent.
3. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterised in that faraday's rotation
The centre wavelength for turning device is 1940nm.
4. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterised in that the transmission device
One end connects the quarter wave plate, and the other end connects the Faraday rotator, and the transmission device can move the quarter wave plate
Go out laser optical path, while the Faraday rotator is moved into laser optical path, the transmission device can also be by the faraday
Circulator removes laser optical path, while the quarter wave plate is moved into laser optical path.
5. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterised in that the fibre core is mixed
Thulium concentration is 4 × 1024~6 × 1024m-3。
6. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterised in that the polarizer is
Glan prism, there is dichroism crystal or in one kind in the white stone eyeglass heap of Brewster angle placement, it is described electric-optically Q-switched
Crystal is one kind 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 characterised in that the highly magnesium-doped niobium
The doping concentration of magnesia is 5.1 weight % in sour crystalline lithium.
8. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterised in that the polarization-maintaining covering
Power stripper is 20~30db to the dough softening of transmission light in the inner cladding, and extinction ratio is more than 18db.
9. 1.9 microns of high-power prostate laser therapeutic apparantus as claimed in claim 1, it is characterised in that the fiber grating
The wavelength of reflection kernel is 1940nm, and transmissivity of the fiber grating in the range of 1940 ± 60nm is 20~40%, described
The reflection bandwidth of fiber grating is 0.5nm.
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| 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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| EP0577295A1 (en) * | 1992-06-29 | 1994-01-05 | AT&T Corp. | Resonantly enhanced optical second harmonic generator |
| CN101051164A (en) * | 2006-04-06 | 2007-10-10 | 杨爱萍 | Circular chamber regulating Q optical fiber laser regenerating amplifier |
| CN101071931A (en) * | 2007-05-23 | 2007-11-14 | 上海瑞柯恩激光技术有限公司 | High power thulium laser |
| CN101257179A (en) * | 2008-04-02 | 2008-09-03 | 中国科学院上海光学精密机械研究所 | Tunable thulium-doped fiber laser |
| CN204517143U (en) * | 2015-02-14 | 2015-07-29 | 中国科学院苏州生物医学工程技术研究所 | A kind of 1.9 microns of high-power prostate laser therapeutic apparantus |
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