CN105470805A - High-performance laser system based on doping concentration gradually-changed ceramics - Google Patents
High-performance laser system based on doping concentration gradually-changed ceramics Download PDFInfo
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- CN105470805A CN105470805A CN201610013072.9A CN201610013072A CN105470805A CN 105470805 A CN105470805 A CN 105470805A CN 201610013072 A CN201610013072 A CN 201610013072A CN 105470805 A CN105470805 A CN 105470805A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1685—Ceramics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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Abstract
The invention discloses a high-performance laser system based on doping concentration gradually-changed ceramics. The high-performance laser system is characterized in that the laser system comprises an LD pumping source, a transmission fiber, a lens coupling device and a resonant cavity which are connected in sequence, wherein the resonant cavity is internally provided with a ceramic gain medium, the ceramic gain medium is prepared and obtained by adopting a non-aqueous tape casting technology in combination with a vacuum sintering technology, and active ion concentration gradually-changed doping is realized. The high-performance laser system has the advantages that the self-absorption loss is reduced, the heat effect is weak, the service life is prolonged, and the system is high in power, high in damage threshold, high in light-light conversion efficiency, good in optical beam quality and stable in performance.
Description
Technical field
The invention belongs to solid state laser technical field, be specifically related to a kind of high-performance laser system based on doping content gradual change pottery.
Background technology
High power high-repetition-rate all solid state laser is increasingly extensive in the application in the fields such as industrial processes, military and national defense, medical operating, academic scientific research, require also more and more higher to laser output power, beam quality etc., but the thermal effect that the gain media quantum defect in solid state laser is brought is all the significant obstacle of its development of restriction all the time.The average power of solid state laser and the limited key of beam quality are exactly the thermal effect problem being laser material in solid state laser operation process.During the running of solid state laser high-average power, the temperature in medium is seriously uneven, and the thermal stress that this uneven Temperature Distribution causes is the major reason that restriction solid state laser power output improves.Say in a sense, the development process of high power solid state laser be exactly how to reduce the negative effect of laser medium thermal effect, overcome thermal lens, the unfavorable factor such as thermal stress, thermal distoftion, improve the process of power output and output beam quality.Transparent ceramic, as solid laser material the most popular in recent years, has the build-in attribute being much better than monocrystalline and glass, such as: preparation temperature is low, cycle is short, and size is large, controlled shape, active ions doping content can be high and evenly, low cost, capacity of heat transmission is strong.But single doping content laser ceramics still has obvious thermal effect as laser gain medium, how research is by inventing new forming method, and it is very important and significant for overcoming high power solid ceramic laser heat effect problem.
The thermal effect overcoming high power solid state laser depends on Materials, the tremendous expansion in laser material field will certainly promote the sustainable development of Solid State Laser, along with the progress of multi-layer compound structure forming process of ceramics and sintering process, composite structural ceramic shows in the laser and reduces the thermal effect of pottery and the advantage of better beam quality.
The shaping normal employing compression molding of traditional transparent ceramic, is also named dry-pressing formed, is that powder is added a small amount of bonding agent, then the powder after granulation is placed in punching block through granulation, and on forcing press, pressurization forms the base substrate of definite shape.Traditional die press technology for forming is simple, easy to operate, density is high, and size is more accurate, and sintering shrinkage is little.But blank internal density is uneven, have big and small soft-agglomerated, carry out multilayer dry compacting operation, compound interface easily bending, out-of-flatness affects beam quality, and formed precision is poor, and structure is simple, doping content is single, the solid state laser of compacting is strong by ceramic thermal effect, and the average power of restriction laser and beam quality, so traditional once molding formed method is unfavorable for preparing solid ceramic laser.
To compare dry-pressing formed technology, the Ceramic optical transparency of the sandwich construction of the shaping preparation of non-aqueous tape-casting is good, microstructure is finer and close, bubble is little and less, very smooth, the Doped ions concentration in interface more evenly and the width of interface diffusion layer narrow, especially flow casting molding can obtain straight interface, this is very important to the transmission of light in composite construction laser ceramics, greatly can reduce the thermal gradient of medium scatters loss and media interior, improve absorption efficiency and the laser output power of pump light, improve beam quality.Non-aqueous tape-casting forming technique can be specified in preparation, there is micro-structural and the composite construction laser transparent ceramic field of accuracy controlling can have feasibility, good development prospect and using value.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of high-performance laser system based on doping content gradual change pottery is provided, this Optical Maser System makes the activated ion concentration in ceramic gain medium be gradient doping, by the capacity of heat transmission of the mechanism raising composite structural ceramic entirety that the conductive coefficient of material increases with the reduction of Doped ions concentration, thus reduction thermal effect, improve laser beam quality.
The object of the invention realizes being completed by following technical scheme:
A kind of high-performance laser system based on doping content gradual change pottery, it is characterized in that described Optical Maser System comprises LD pumping source, Transmission Fibers, Lens Coupling device and the resonant cavity connected successively, be provided with ceramic gain medium in described resonant cavity, the activated ion concentration in described ceramic gain medium is gradient doping.
Activated ion concentration in described ceramic gain medium also parabolically distributes about described ceramic gain medium center line is symmetrical.
Active ions in described ceramic gain medium can be one or more combinations in Yb, Tm, Nd, Er rare earth element ion.
The base material of described ceramic gain medium can be Y
2o
3, YAG, LuAG, AL
2o
3in one or more combination.
Be all-trans chamber mirror, ceramic gain medium, concave surface of the plane set gradually that comprises described resonant cavity is all-trans chamber mirror and output coupling mirror.
Be all-trans chamber mirror, ceramic gain medium, concave surface of the plane set gradually that comprises described resonant cavity is all-trans chamber mirror, dispersing prism and output coupling mirror, and described dispersing prism is that Brewster angle is arranged.
Be all-trans chamber mirror, ceramic gain medium, concave surface of the plane set gradually that comprises described resonant cavity is all-trans chamber mirror, output coupling mirror, concave mirror and SESAM.
Described Optical Maser System exports continuous laser or pulse laser, and locked mode mechanism can be non-linear reflector modulus-locking, initiatively modulate locked mode or passive Ke Er locked mode.
Advantage of the present invention is:
(1) the concentration gradient doped structure pottery that non-aqueous tape-casting moulding process is prepared in conjunction with vacuum sintering technique is adopted, interface is smooth, in pump light transmission direction, doping content gradual change or transition, effectively reduce the factors such as thermal lensing effect, thermal stress, thermal distoftion;
(2) non-aqueous tape-casting forming technique and vacuum sintering technique is adopted to prepare concentration gradient doped structure pottery, achieve ultrahigh concentration doping and graded concentration doped structure, relative to single-layer ceramic, improve the damage threshold of gain media, improve the capacity of heat transmission of ceramic gain medium, make the pumping efficiency of pump light higher, be beneficial to the more high-power laser of output;
(3) laser can realize exporting tunable wavelength continuous laser and the adjustable locked mode picosecond pulse laser of repetition rate;
(4) adopt concentration gradient doped structure pottery as gain media, obtain good laser beam quality and lower Laser output threshold value, good laser transverse mode pattern easily realizes mode-lock operation, and modelocking threshold is low;
(5) the transparent ceramic kind that can be used as gain media is a lot, and each pottery artificially can arrange the parameters such as doping function, Doped ions, doping content, the doping number of plies, doping thickness to realize different structure;
(6) adopt doping content gradual change pottery, greatly can reduce the reabsorption loss of pottery, improve the service efficiency of pump light, thus substantially increase the light-phototranstormation efficiency of laser;
(7) adopt doping content gradual change pottery, ceramic gain medium has excellent capacity of heat transmission, and ceramic doped interface is smooth, extend the useful life of laser, improve quality and the laser activity of laser beam, reduce the destructive power to pottery, be conducive to the application extension of laser.
Accompanying drawing explanation
Fig. 1 is with the three mirror resonant cavity continuous wave laser system schematic that concentration gradient doped ceramics is gain media in the present invention;
Fig. 2 is with the three mirror resonant cavity tuned laser system schematic that concentration gradient doped ceramics is gain media in the present invention;
Fig. 3 is with the five-mirror cavity mode locked laser system schematic diagram that concentration gradient doped ceramics is gain media in the present invention.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technical staff of the same trade:
Be respectively as marked 1-11 in Fig. 1-3, figure: be all-trans chamber mirror 5, ceramic gain medium 6, concave surface of LD pumping source 1, Transmission Fibers 2, Lens Coupling device 3, resonant cavity 4, plane is all-trans chamber mirror 7, output coupling mirror 8, dispersing prism 9, concave mirror 10, SESAM11.
Embodiment 1: as shown in Figure 1, the present embodiment is specifically related to a kind of three mirror resonant cavity continuous wave laser systems based on doping content gradual change pottery, this Optical Maser System is made up of the LD pumping source 1 connected successively, Transmission Fibers 2, Lens Coupling device 3 and resonant cavity 4, wherein:
Be all-trans chamber mirror 5, ceramic gain medium 6, concave surface of the plane set gradually that comprises resonant cavity 4 is all-trans chamber mirror 7 and output coupling mirror 8; Be all-trans chamber mirror 5 and concave surface of plane is all-trans and chamber mirror 7 is coated with the deielectric-coating that the thoroughly high and exciting light of pump light is all-trans; Output coupling mirror 8 is coated with and meets the deielectric-coating that pump light is thoroughly high and exciting light height is anti-, Laser output ratio can regulate; In ceramic gain medium 6 is be prepared from conjunction with vacuum sintering technique based on non-aqueous tape-casting forming technique, realize activated ion concentration gradient doping, and from left to right, doping content parabolically can distribute about ceramic gain medium 6 midline position symmetry, can also the doping in transition, and doping content, the doping number of plies, doped layer thickness can design according to actual needs; Active ions in ceramic gain medium 6 can be one or more in the rare earth element ions such as Yb, Tm, Nd, Er, and its base material can be then Y
2o
3, YAG, LuAG, AL
2o
3deng high compactness and the reasonable transparent ceramic of heat conduction ability.
As shown in Figure 1, the method for work of the three mirror resonant cavity continuous wave laser systems based on doping content gradual change pottery in the present embodiment is:
LD pumping source 1 adopts end pumping mode, and its pump light sent enters to inject resonant cavity 4 via Transmission Fibers 2 and Lens Coupling device 3, realizes gain media population inversion, Output of laser.Concrete: pump light converges enter the lower one end of ceramic gain medium 6 doping content via Transmission Fibers 2, Lens Coupling device 3 and the plane chamber mirror 5 that is all-trans, and in low doping concentration region, little pump energy is absorbed by pottery, and thermal effect is very weak, when described pump light enters doping content higher one end, now the energy of ceramic absorptive pumping light is more, but because pump light is absorbed most in transmitting procedure in pottery, its power density diminishes, thermal effect is still more weak, and the obviously reduction of Uniform Doped pottery is compared in ceramic self-absorption loss, the heat of pottery accumulated inside reduces, the heat that water cooling plant is enough to pottery is inner is taken away, ensure the not cracked and efficient gain of pottery, exciting light oscillate in three mirror cavity amplifies, continuous laser is exported from output coupling mirror 8, then to possess heat resistanceheat resistant damage threshold high for described high-performance laser, power is high, beam quality is high, light-phototranstormation efficiency is high, life-span is long, the performances such as stable performance.
Embodiment 2: as shown in Figure 2, the present embodiment is specifically related to a kind of three mirror resonant cavity tunable Optical Maser Systems based on doping content gradual change pottery, this Optical Maser System is made up of the LD pumping source 1 connected successively, Transmission Fibers 2, Lens Coupling device 3 and resonant cavity 4, wherein:
Be all-trans chamber mirror 5, ceramic gain medium 6, concave surface of the plane set gradually that comprises resonant cavity 4 to be all-trans chamber mirror 7, dispersing prism 9 and output coupling mirror 8, to form tunable three mirror resonant cavitys 4; Be all-trans chamber mirror 5 and concave surface of plane is all-trans and chamber mirror 7 is coated with the deielectric-coating that the thoroughly high and exciting light of pump light is all-trans; Output coupling mirror 8 is coated with and meets the deielectric-coating that pump light is thoroughly high and exciting light height is anti-, Laser output ratio can regulate; Dispersing prism 9 is arranged with Brewster's angle, and its model can be quartz prism, SF10, SF57 etc.; In ceramic gain medium 6 is be prepared from conjunction with vacuum sintering technique based on non-aqueous tape-casting forming technique, realize activated ion concentration gradient doping, and from left to right, doping content parabolically can distribute about ceramic gain medium 6 midline position symmetry, can also the doping in transition, and doping content, the doping number of plies, doped layer thickness can design according to actual needs; Active ions in ceramic gain medium 6 can be one or more in the rare earth element ions such as Yb, Tm, Nd, Er, and its base material can be then Y
2o
3, YAG, LuAG, AL
2o
3deng high compactness and the reasonable transparent ceramic of heat conduction ability.
As shown in Figure 2, the method for work of the three mirror resonant cavity tunable Optical Maser Systems based on doping content gradual change pottery in the present embodiment is:
LD pumping source 1 adopts end pumping mode, its pump light sent enters to inject resonant cavity 4 via Transmission Fibers 2 and Lens Coupling device 3, realize gain media population inversion, Output of laser, concrete: pump light converges enter the lower one end of ceramic gain medium 6 doping content via Transmission Fibers 2, Lens Coupling device 3 and the plane chamber mirror 5 that is all-trans, in low doping concentration region, little pump energy is absorbed by pottery, and thermal effect is very weak, when described pump light enters doping content higher one end, now the energy of ceramic absorptive pumping light is more, but because pump light is absorbed most in transmitting procedure in pottery, its power density diminishes, thermal effect is still more weak, and the obviously reduction of Uniform Doped pottery is compared in ceramic self-absorption loss, the heat of pottery accumulated inside reduces, the heat that water cooling plant is enough to pottery is inner is taken away, ensure the not cracked and efficient gain of pottery, insert the Output of laser wavelength of dispersing prism 9 for tuned laser system of setting with Brewster's angle in chamber, exciting light oscillate in three mirror cavity amplifies, continuous laser is exported from output coupling mirror 8, then to possess heat resistanceheat resistant damage threshold high for described high-performance laser, power is high, beam quality is high, light-phototranstormation efficiency is high, life-span is long, the performances such as stable performance.
Embodiment 3: as shown in Figure 3, the present embodiment is specifically related to a kind of five-mirror cavity SESAM passive mode locking pulsed laser system based on doping content gradual change pottery, this Optical Maser System is made up of the LD pumping source 1 connected successively, Transmission Fibers 2, Lens Coupling device 3 and resonant cavity 4, wherein:
Be all-trans chamber mirror 5, ceramic gain medium 6, concave surface of the plane that comprises resonant cavity 4 is all-trans chamber mirror 7, output coupling mirror 8, concave mirror 10 and SESAM11; Be all-trans chamber mirror 5 and concave surface of plane is all-trans and chamber mirror 7,10 is coated with the deielectric-coating that the thoroughly high and exciting light of pump light is all-trans; Output coupling mirror 8 is coated with and meets the deielectric-coating that pump light is thoroughly high and exciting light height is anti-, Laser output ratio can regulate; In ceramic gain medium 6 is be prepared from conjunction with vacuum sintering technique based on non-aqueous tape-casting forming technique, realize activated ion concentration gradient doping, and from left to right, doping content parabolically can distribute about ceramic gain medium 6 midline position symmetry, can also the doping in transition, and doping content, the doping number of plies, doped layer thickness can design according to actual needs; Active ions in ceramic gain medium 6 can be one or more in the rare earth element ions such as Yb, Tm, Nd, Er, and its base material can be then Y
2o
3, YAG, LuAG, AL
2o
3deng high compactness and the reasonable transparent ceramic of heat conduction ability.
As shown in Figure 3, the method for work of the five-mirror cavity SESAM passive mode locking pulsed laser system based on doping content gradual change pottery in the present embodiment is:
LD pumping source 1 adopts end pumping mode, its pump light sent enters to inject resonant cavity 4 via Transmission Fibers 2 and Lens Coupling device 3, realize gain media population inversion, Output of laser, concrete: pump light converges enter the lower one end of ceramic gain medium 6 doping content via Transmission Fibers 2, Lens Coupling device 3 and the plane chamber mirror 5 that is all-trans, in low doping concentration region, little pump energy is absorbed by pottery, and thermal effect is very weak, when described pump light enters doping content higher one end, now the energy of ceramic absorptive pumping light is more, but because pump light is absorbed most in transmitting procedure in pottery, its power density diminishes, thermal effect is still more weak, and the obviously reduction of Uniform Doped pottery is compared in ceramic self-absorption loss, the heat of pottery accumulated inside reduces, the heat that water cooling plant is enough to pottery is inner is taken away, ensure the not cracked and efficient gain of pottery, exciting light vibrates amplification in five mirror chambeies, optimal cavity 4, passive mode locking is realized by SESAM11, the high power pulsed laser of two bundles separation is exported from output coupling mirror 8, then to possess heat resistanceheat resistant damage threshold low for described high-performance laser, peak power is high, narrow spaces, beam quality is high, life-span is long, the performances such as stable performance.
Claims (8)
1. the high-performance laser system based on doping content gradual change pottery, it is characterized in that described Optical Maser System comprises LD pumping source, Transmission Fibers, Lens Coupling device and the resonant cavity connected successively, be provided with ceramic gain medium in described resonant cavity, the activated ion concentration in described ceramic gain medium is gradient doping.
2. a kind of high-performance laser system based on doping content gradual change pottery according to claim 1, is characterized in that the activated ion concentration in described ceramic gain medium also parabolically distributes about described ceramic gain medium center line is symmetrical.
3. a kind of high-performance laser system based on doping content gradual change pottery according to claim 1 and 2, the active ions that it is characterized in that in described ceramic gain medium can be one or more combinations in Yb, Tm, Nd, Er rare earth element ion.
4. a kind of high-performance laser system based on doping content gradual change pottery according to claim 1 and 2, is characterized in that the base material of described ceramic gain medium can be Y
2o
3, YAG, LuAG, AL
2o
3in one or more combination.
5. a kind of high-performance laser system based on doping content gradual change pottery according to claim 1, is characterized in that described resonant cavity comprises be all-trans chamber mirror, ceramic gain medium, concave surface of the plane set gradually and to be all-trans chamber mirror and output coupling mirror.
6. a kind of high-performance laser system based on doping content gradual change pottery according to claim 1, it is characterized in that described resonant cavity comprises be all-trans chamber mirror, ceramic gain medium, concave surface of the plane set gradually and to be all-trans chamber mirror, dispersing prism and output coupling mirror, described dispersing prism is that Brewster angle is arranged.
7. a kind of high-performance laser system based on doping content gradual change pottery according to claim 1, is characterized in that described resonant cavity comprises be all-trans chamber mirror, ceramic gain medium, concave surface of the plane set gradually and to be all-trans chamber mirror, output coupling mirror, concave mirror and SESAM.
8. a kind of high-performance laser system based on doping content gradual change pottery according to claim 1; it is characterized in that described Optical Maser System exports continuous laser or pulse laser, locked mode mechanism can be non-linear reflector modulus-locking, initiatively modulate locked mode or passive Ke Er locked mode.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109567932A (en) * | 2018-12-07 | 2019-04-05 | 中聚科技股份有限公司 | A kind of laser therapeutic system using thulium doped fiber |
| CN109962402A (en) * | 2017-12-25 | 2019-07-02 | 中国建筑材料科学研究总院有限公司 | A kind of laser medium and laser |
| CN110216383A (en) * | 2019-03-27 | 2019-09-10 | 上海大学 | A method of spherical concave mirror is prepared in optical waveguide based on laser cold working |
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| CN110216383A (en) * | 2019-03-27 | 2019-09-10 | 上海大学 | A method of spherical concave mirror is prepared in optical waveguide based on laser cold working |
| CN110216383B (en) * | 2019-03-27 | 2021-08-10 | 上海大学 | Method for preparing spherical concave mirror on optical waveguide based on laser cold machining |
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Application publication date: 20160406 |