CN203747230U - High-efficient single-pump-source dual-end symmetric pump laser - Google Patents
High-efficient single-pump-source dual-end symmetric pump laser Download PDFInfo
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- CN203747230U CN203747230U CN201420112048.7U CN201420112048U CN203747230U CN 203747230 U CN203747230 U CN 203747230U CN 201420112048 U CN201420112048 U CN 201420112048U CN 203747230 U CN203747230 U CN 203747230U
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Abstract
The utility model provides a high-efficient single-pump-source dual-end symmetric pump laser comprising a semiconductor laser pump source, a pump light coupled fiber, a collimating lens, a first focusing lens, a first resonator reflector, a laser gain medium, a second resonator reflector, a second focusing lens, a pump light total reflector, a laser output coupling reflector, and an L-shaped laser resonator, wherein the pump light coupled fiber, the collimating lens, the first focusing lens, the first resonator reflector, the laser gain medium, the second resonator reflector, the second focusing lens, and the pump light total reflector are arranged successively along an optical axis, and the L-shaped laser resonator is formed by the first resonator reflector, the second resonator reflector, and the laser output coupling reflector. By means of reasonably-configured optical elements and optimized pump structural design, the high-efficient single-pump-source dual-end symmetric pump laser offsets the thermal effect of the laser gain medium. A recycle method is used for resolving a problem of incomplete single absorption of pump light so as to greatly increase the utilization rate of the pump light. An end-pumped laser with high efficiency, high power, and a high light beam quality is achieved. The high-efficient single-pump-source dual-end symmetric pump laser is simple and compact, greatly decreased in hardware cost, convenient in installing and debugging, and excellent in comprehensive performance, and can be widely used in the technical field of diode pumped solid state laser such as fundamental frequency laser, variable-frequency laser, and Q-adjusting mode-locking laser.
Description
Technical field
The utility model relates to laser technology application, particularly relates to a kind of efficient single pumping source both-end symmetrical expression pump laser.
Background technology
The practical advantages such as all solid state laser (DPSSL, Diode Pumped Solid State Laser) has that efficiency is high, dependable performance, lightweight, simple and compact for structure, output beam quality is good, and the higher and price of power stability is low.As the core component of all solid state laser, semiconductor laser pumping source is particularly important.Just because of the develop rapidly of semiconductor diode manufacturing technology, the performance of all solid state laser also constantly improves.At present, single semiconductor diode pump source of being exported by coupling fiber, its laser power can reach 75W, 100W, even several hectowatts.But, due to the restriction of laser crystal performance, improve simply pumping light power and cannot directly obtain the Laser output of high-power and high-lighting beam quality.In actual applications, the power output of existing typical single end face pump laser is mainly confined to two problems.The first, high-power pump light one way can not be completely absorbed by laser crystal; The second, single-ended pumping easily causes that a side of laser crystal is heated inhomogeneous and causes intracrystalline thermal effect, finally makes the beam quality of Output of laser that serious distortion occurs.Therefore, only have and effectively improve end pumping structure, could realize efficient Laser output.
So far, in prior art, the most typical pumping design remains the laser of single-ended pumping configuration.In order further to improve the power output of end-pumped laser, both-end pumping laser is put forward by people.Wherein, typical double-end pumping laser is to adopt the both sides (China Patent Publication No. CN102044837A and CN202695966U) of pumping laser crystal simultaneously, two identical semiconductor diode sources.Although this design can overcome the distortion of light beam, obtain higher good beam quality, this structure does not consider that pump light one way absorbs incomplete problem, and need to be made up of two diode pumping sources.Relatively single pumping source, process is more complicated, and equipment cost is high, and practical application is difficulty comparatively.Another kind of typical structure is single diode double-end pumping laser (China Patent Publication No. CN102570266A).This design is that the pump light of a diode pump source is divided into after two parts, injects respectively the two ends of laser crystal by pump light turning mirror.This structure can overcome the distortion of light beam, obtains higher good beam quality, but this structure does not consider that pump light one way absorbs incomplete problem yet.In addition, in this structure, utilized multiple pump light total reflective mirrors, not only made complex structure, and also decay waste in multiple reflections of pump light.For these problems, the utility model improves this, has proposed a kind of efficient single pumping source both-end symmetrical expression pump laser.
Utility model content
The purpose of this utility model is to provide a kind of efficient single pumping source both-end symmetrical expression pump laser, it can improve the utilance of pump light, overcome pump light one way and absorb the thermal effect that incomplete problem and laser crystal cause, obtain the Laser output of efficient high-power and high-lighting beam quality.
To achieve these goals, the utility model adopts following technical scheme:
A kind of efficient single pumping source both-end symmetrical expression pump laser, is characterized in that: the pump light coupled fiber, collimating lens, the first condenser lens, the first resonator mirror, gain medium, the second resonator mirror, the second condenser lens, the pump light total reflective mirror that comprise semiconductor laser pumping source and place successively along optical axis;
Also comprise Laser output coupling mirror, form L shaped laserresonator by the first resonator mirror, the second resonator mirror and Laser output coupling mirror;
The first condenser lens and the second condenser lens have identical focal length, the focus intersection that is centered close to the first condenser lens and the second condenser lens of gain medium; The output of pump light coupled fiber is positioned at the focus place of the corresponding side of collimating lens.
Above-mentioned gain medium adopts Nd:YVO4 crystal, Nd:YAG crystal, Yb:YAG crystal, Ho:YAG crystal, Tm:YAG crystal, Nd:YLF, Tm:YLF crystal and Er, the one in Yb:YAG crystal or pottery; Or adopt the laser cooling that bonding techniques obtains at its unadulterated crystal of two ends bonding that passes through in above-mentioned each crystal.
The shape of above-mentioned gain medium adopts lath shape or the microplate shape of the bulk of cuboid, cylindrical bulk, thickness 1-2mm.
Above-mentioned the first resonator mirror and the second resonator mirror have, and Double-color film high thoroughly to pump light, that fundamental frequency light is all-trans is.
In above-mentioned gain medium, there is specific activated ion concentration, make pump light one way by time absorption efficiency be about 50% left and right.
The minute surface of above-mentioned the second resonator mirror is placed perpendicular to the optical axis of described laserresonator, and the minute surface of above-mentioned the first resonator mirror becomes a certain angle folding with optical axis, and described Laser output coupling mirror is vertically positioned over light path end.
With the alternative Laser output coupling mirror of double-colored total reflective mirror, with alternative the first resonator mirror of 45 degree output coupling mirrors, form L shaped laserresonator by 45 degree output coupling mirrors, the second resonator mirror and double-colored total reflective mirror; And between double-colored total reflective mirror and 45 degree output coupling mirrors, insert nonlinear optical crystal or modulation element, form the frequency conversion laser device of modulation.
Adopt after such scheme, a kind of efficient single pumping source both-end symmetrical expression pump laser of the utility model, has the following advantages: the first, pump light completely reflecting mirror is set, and make residual pump light again by gain medium, reach recycling; The second, both-end pumping is designed with and is beneficial to the thermal effect of offsetting in pumping process, realizes high light beam quality; The 3rd, this is simple in structure and compact, greatly saves hardware cost, and adjustment and installation is convenient, practical.
The utility model, by reasonably configuring optical element, is optimized pumping configuration design and is offset the thermal effect of gain medium, has realized the end-pumped laser of high-efficiency high power high light beam quality.This laser excellent combination property, can be widely used in the all-solid state laser technical fields such as basic frequency laser, frequency conversion laser and Q-switch and mode-locking laser.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment mono-;
Fig. 2 is the structural representation of the utility model embodiment bis-;
Wherein, 1: semiconductor laser pumping source; 2: pump light coupled fiber; 3: collimating lens; 4: the first condenser lenses; 5: the first resonator mirrors; 6: the second resonator mirrors; 7: the second condenser lenses; 8: pump light total reflective mirror; 9: gain medium; 10: Laser output coupling mirror; 11: nonlinear optical crystal; 12: double-colored total reflective mirror; 13:45 degree output coupling mirror.
Embodiment
Embodiment mono-:
A kind of efficient single pumping source both-end symmetrical expression pump laser of the utility model, as shown in Figure 1, comprise semiconductor laser pumping source 1, pump light coupled fiber 2, collimating lens 3, the first condenser lens 4, the first resonator mirror 5, the second resonator mirrors 6, the second condenser lens 7, pump light total reflective mirror 8, gain medium 9, Laser output coupling mirror 10.
Pump light coupled fiber 2, collimating lens 3, the first condenser lens 4, the first resonator mirror 5, the second resonator mirror 6, the second condenser lens 7 and pump light total reflective mirror 8 are placed successively along optical axis.Form laserresonator by the first resonator mirror 5, the second resonator mirror 6 and Laser output coupling mirror 10, this resonant cavity is L shaped.Between the first resonator mirror 5 and the second resonator mirror 6, place gain medium 9.
The first condenser lens 4 and the second condenser lens 7 have identical focal length.The focus intersection that is centered close to the first condenser lens 4 and the second condenser lens 7 of gain medium 9.
The minute surface of the second resonator mirror 6 is placed perpendicular to the optical axis of laserresonator; The minute surface of the first resonator mirror 5 can become any angle folding with optical axis, in the present embodiment, and the minute surface of the first resonator mirror 5 and optical axis angle folding at 45 °; Laser output coupling mirror 10 is vertically positioned over light path end.
Wherein:
Semiconductor laser pumping source 1 adopts peak power output 75W, the laser diode module that emission center wavelength is 808nm.This laser diode module generally adopts water-cooling, to keep good pump power stability.It is furnished with coupled fiber and connects hole, exports by pumping coupled fiber 2.
It is 200 μ m that pump light coupled fiber 2 adopts optical fiber core diameter, the standard coupling optical fiber that numerical aperture is 0.22.The coupled fiber that the input of pump light coupled fiber 2 is connected in semiconductor laser pumping source 1 connects hole, and output is positioned at the focus place of the corresponding side of collimating lens 3.
It is the biconvex lens of 30mm and 60mm that collimating lens 3 and the first condenser lens 4 adopt respectively focal length, and the two-sided high transmittance film being coated with 808nm wavelength.Form by collimating lens 3 and the first condenser lens 4 set of lenses that coupling ratio is 1:2, after the set of lenses collimation focusing that pump light is 1:2 through this coupling ratio, converge to gain medium 9 centers by the first resonator mirror 5.
Gain medium 9 can adopt Nd:YVO4 crystal, Nd:YAG crystal, Yb:YAG crystal, Ho:YAG crystal, Tm:YAG crystal, Nd:YLF, Tm:YLF crystal and Er, the one in Yb:YAG crystal or pottery; Or adopt the laser cooling (as YAG/Nd:YAG/YAG) that bonding techniques obtains at its unadulterated crystal of two ends bonding that passes through in above-mentioned each crystal.In the present embodiment, select Nd-doped yttrium vanadate Nd:YVO4 crystal, be of a size of 3 × 3 × 10mm
3, Nd doping content is 0.3at.%, according to the absorption coefficient of crystal, its one way absorptivity to pump light is about 50% left and right.Two logical light end faces (corresponding to two end faces of optical axis) of gain medium 9 are all coated with the anti-reflection film (transmitance is greater than 99.8%) to pump light 808nm and 1000-1100nm wave band.When use, in order to reduce the thermal effect of laser crystal and to improve conversion efficiency, the side (surfaces beyond two logical light end faces) of gain medium 9 needs to adopt metal copper billet parcel, and by TEC semiconductor refrigerating or water cooling plant, its temperature is controlled to greenhouse scope.The shape of gain medium 9 can adopt lath shape or the microplate shape of the bulk of cuboid, cylindrical bulk, thickness 1-2mm.
The first resonator mirror 5 is coated with in 45 degree directions, and two look films anti-reflection to the pump light of 808nm wavelength, that 1000-1100nm wave band is all-trans are that minute surface normal becomes 45 degree to place with optical axis.
The second resonator mirror 6 is coated with in 0 degree direction, and two look films anti-reflection to the pump light of 808nm wavelength, that 1000-1100nm wave band is all-trans are that minute surface normal becomes 0 degree to place with optical axis.
It is the biconvex lens of 60mm that the second condenser lens 7 adopts focal length, and the two-sided high transmittance film being coated with 808nm wavelength.The centre distance of it and gain medium 9 is 60mm, and unabsorbed pump light reflects and again converges at gain medium 9 centers through pump light total reflective mirror 8, reaches the effect of symmetric pump.
Laser output coupling mirror 10 is coated with the part of 1064nm fundamental wavelength is seen through to film, the general eyeglass that is 15%-30% to 1064nm transmitance that adopts, and its minute surface normal becomes 0 degree to place with optical axis.
When work, the pump light that launch in semiconductor laser pumping source 1 is after 2 outputs of pump light coupled fiber, and entering collimating lens 3 collimations is directional light, then converges at the center of gain medium 9 and be absorbed through the first condenser lens 4 and the first resonator mirror 5; Remaining pump light is through the second resonator mirror 6 and the second condenser lens 7 is reduced to directional light and adopt pump light total reflective mirror 8 to be focused at Ta center from the other end of gain medium 9.Fundamental frequency light is being formed in laserresonator and vibrated by the first resonator mirror 5, the second resonator mirror 6 and Laser output coupling mirror 10, and exports by Laser output coupling mirror 10.In the present embodiment, for fear of the full phenomenon of closing of laser gain, it is compact that the distance between the each optical element in laserresonator should keep, and is conducive to realize high-power output.
Embodiment bis-:
Embodiment bis-of the present utility model as shown in Figure 2, its is different from embodiment 1: with the alternative Laser output coupling mirror 10 of double-colored total reflective mirror 12, with alternative the first resonator mirror 5 of 45 degree output coupling mirrors 13, form L shaped laserresonator by 45 degree output coupling mirrors 13, the second resonator mirror 6 and double-colored total reflective mirror 12; And insert nonlinear optical crystal 11 between double-colored total reflective mirror 12 and 45 degree output coupling mirrors 13.Specific as follows:
Nonlinear optical crystal 11 is three lithium borate lbo crystals, is of a size of 3 × 3 × 15mm
3, its phase matching angle can be selected according to the actual temperature of temperature control, and for example 25 when spend, and matching angle is θ=90 °, Φ=11.4 °.Two logical light end faces (corresponding to two end faces of optical axis) of nonlinear optical crystal 11 are all coated with the anti-reflection film (transmitance is greater than 99.8%) to frequency doubled light 532nm and 1000-1100nm wave band.Nonlinear optical crystal 11 also can adopt the one in BIBO crystal, bbo crystal, ktp crystal, or adopts the one in period polarized PPLN crystal, PPLT crystal, PPKTP crystal.The nonlinear optical process that these crystal occur in optical resonator is frequency-doubled effect.
The minute surface of double-colored total reflective mirror 12 is placed perpendicular to light path.Double-colored total reflective mirror 12 is coated with the two anti-reflection films (reflectivity is greater than 99.8%) to frequency doubled light 532nm and fundamental frequency light 1064nm.
It is that minute surface normal becomes 45 degree to place with optical axis that 45 degree output coupling mirrors 13 are coated with two look films anti-reflection to the light of 532nm and 808nm wavelength, that 1000-1100nm wave band is all-trans in 45 degree directions.Fundamental frequency light vibrates in the L shaped laserresonator being made up of the second resonator mirror 6,45 degree output coupling mirrors 13 and double-colored total reflective mirror 12; Double-frequency laser is exported by 45 degree output coupling mirrors 13.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. an efficient single pumping source both-end symmetrical expression pump laser, is characterized in that: the pump light coupled fiber, collimating lens, the first condenser lens, the first resonator mirror, gain medium, the second resonator mirror, the second condenser lens, the pump light total reflective mirror that comprise semiconductor laser pumping source and place successively along optical axis;
Also comprise Laser output coupling mirror, form L shaped laserresonator by the first resonator mirror, the second resonator mirror and Laser output coupling mirror;
The first condenser lens and the second condenser lens have identical focal length, the focus intersection that is centered close to the first condenser lens and the second condenser lens of gain medium; The output of pump light coupled fiber is positioned at the focus place of the corresponding side of collimating lens.
2. the efficient single pumping source both-end symmetrical expression pump laser of one according to claim 1, it is characterized in that: above-mentioned gain medium adopts Nd:YVO4 crystal, Nd:YAG crystal, Yb:YAG crystal, Ho:YAG crystal, Tm:YAG crystal, Nd:YLF, Tm:YLF crystal and Er, the one in Yb:YAG crystal or pottery; Or adopt the laser cooling that bonding techniques obtains at its unadulterated crystal of two ends bonding that passes through in above-mentioned each crystal.
3. the efficient single pumping source both-end symmetrical expression pump laser of one according to claim 1 and 2, is characterized in that: the shape of above-mentioned gain medium adopts lath shape or the microplate shape of the bulk of cuboid, cylindrical bulk, thickness 1-2mm.
4. the efficient single pumping source both-end symmetrical expression pump laser of one according to claim 1, is characterized in that: above-mentioned the first resonator mirror and the second resonator mirror have Double-color film high thoroughly to pump light, that fundamental frequency light is all-trans and be.
5. the efficient single pumping source both-end symmetrical expression pump laser of one according to claim 1 and 2, is characterized in that: in above-mentioned gain medium, there is specific activated ion concentration, make pump light one way by time absorption efficiency be about 50% left and right.
6. the efficient single pumping source both-end symmetrical expression pump laser of one according to claim 1, it is characterized in that: the minute surface of above-mentioned the second resonator mirror is placed perpendicular to the optical axis of described laserresonator, the minute surface of above-mentioned the first resonator mirror becomes a certain angle folding with optical axis, described Laser output coupling mirror is vertically positioned over light path end.
7. the efficient single pumping source both-end symmetrical expression pump laser of one according to claim 1, it is characterized in that: with the alternative Laser output coupling mirror of double-colored total reflective mirror, with alternative the first resonator mirror of 45 degree output coupling mirrors, form L shaped laserresonator by 45 degree output coupling mirrors, the second resonator mirror and double-colored total reflective mirror; And between double-colored total reflective mirror and 45 degree output coupling mirrors, insert nonlinear optical crystal or modulation element, form the frequency conversion laser device of modulation.
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| CN201420112048.7U CN203747230U (en) | 2014-03-12 | 2014-03-12 | High-efficient single-pump-source dual-end symmetric pump laser |
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| CN201420112048.7U CN203747230U (en) | 2014-03-12 | 2014-03-12 | High-efficient single-pump-source dual-end symmetric pump laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565353A (en) * | 2017-10-17 | 2018-01-09 | 金陵科技学院 | A kind of semiconductor light source pumping multi-resonant chamber solid laser device |
| CN107946888A (en) * | 2018-01-05 | 2018-04-20 | 深圳大学 | A kind of mid-infrared fiber laser |
| CN113078534A (en) * | 2021-03-30 | 2021-07-06 | 北京工业大学 | Intracavity cascade pump laser based on composite structure gain medium |
| CN113131323A (en) * | 2021-03-30 | 2021-07-16 | 山东大学 | Yb-YAG laser amplifier based on dual-wavelength double-end pumping structure |
-
2014
- 2014-03-12 CN CN201420112048.7U patent/CN203747230U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565353A (en) * | 2017-10-17 | 2018-01-09 | 金陵科技学院 | A kind of semiconductor light source pumping multi-resonant chamber solid laser device |
| CN107565353B (en) * | 2017-10-17 | 2023-04-25 | 金陵科技学院 | Semiconductor light source pumping multi-resonant cavity solid laser device |
| CN107946888A (en) * | 2018-01-05 | 2018-04-20 | 深圳大学 | A kind of mid-infrared fiber laser |
| CN113078534A (en) * | 2021-03-30 | 2021-07-06 | 北京工业大学 | Intracavity cascade pump laser based on composite structure gain medium |
| CN113131323A (en) * | 2021-03-30 | 2021-07-16 | 山东大学 | Yb-YAG laser amplifier based on dual-wavelength double-end pumping structure |
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Granted publication date: 20140730 Effective date of abandoning: 20141215 |
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