CN102064459B - Pump device with crystals having linear polarization absorption characteristic - Google Patents
Pump device with crystals having linear polarization absorption characteristic Download PDFInfo
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- CN102064459B CN102064459B CN 201010560686 CN201010560686A CN102064459B CN 102064459 B CN102064459 B CN 102064459B CN 201010560686 CN201010560686 CN 201010560686 CN 201010560686 A CN201010560686 A CN 201010560686A CN 102064459 B CN102064459 B CN 102064459B
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Abstract
The invention discloses a pump device with crystals having a linear polarization absorption characteristic. A polarization module and a polarization direction adjusting module are added in a traditional end surface pump structure in which crystals having a linear polarization absorption characteristic are used as working substances. The absorption efficiency of the crystals having a linear polarization absorption characteristic to pump light is improved, so that the effective utilization rate of a solid laser or an amplifier with the crystals having a linear polarization absorption characteristic for pump light is improved.
Description
Technical field
The present invention relates to the Solid State Laser technical field of end pumping, relate in particular to pump arrangement with linear polarization absorption characteristic crystal.
Background technology
Along with the development of laser diode techniques, laser diode is once tremendous revolution as the pumping source of laser at laser technology field.Inner laser diode, operation material absorption efficiency advantages of higher narrow and replaced the lamp pumping very on a large scale at present with spectral line, and laser diode as the pump mode that laser pumping source adopted in, the end pumping mode has that pumping configuration is simple, coupling efficiency is high, pump beam and advantage such as mould coupling in chamber is good, the output laser beam quality is good, threshold value is low.
The crystal that has a class to have the linear polarization absorption characteristic is as Nd:YVO
4Deng, have very strong polarization absorption and polarized radiation characteristic, be well suited for laser diode-pumped.The crystal that existing employing has a linear polarization absorption characteristic generally includes LD (LaserDiode as pumping source as the end-face pump solid laser of operation material, laser diode), optical fiber, coupled lens and crystal etc., Fig. 1 is the situation that solid state laser adopts single-ended pumping, Fig. 2 is the situation that solid state laser adopts both-end pumping, its working method all is the nature polarized pump, owing to have the crystal of linear polarization absorption characteristic natural polarized pump light had very strong polarization absorption, that is to say, in natural polarized pump light, what only some polarization direction was suitable can be by the high efficiency absorption of this crystalloid, the pump light of all the other polarization directions is effectively absorbed through crystal to lose, therefore, finally influenced the effective utilization of solid state laser to pump light.For the situation of both-end pumping among Fig. 2, this part pump light of missing may enter the LD inside on opposite and bring harm.
In order to improve the effective utilization of solid state laser, also has the solution of end-pumped solid-state laser being carried out optimal design at present, such as the doping concentration that passes through to optimize crystal, increase crystal absorption length etc. to pump light.Though these optimal design are effective, but the laser works material with linear polarization absorption characteristic is still on the low side to natural polarized pump efficiency of light absorption, promptly still some pump light sees through operation material and is not effectively absorbed, this not only can not effectively improve the effective utilization of solid state laser to pump light, and unabsorbed pump light also can influence the performance of laser.
Summary of the invention
The technical problem that the present invention solves is, a kind of pump arrangement with linear polarization absorption characteristic crystal is provided, and improves to have the absorption efficiency of the crystal of linear polarization absorption characteristic to pump light.
The technical solution used in the present invention is that described pump arrangement with linear polarization absorption characteristic crystal comprises: pumping source module, transport module, collimating module, an inclined to one side module, polarization direction adjusting module, convergence module and crystal, wherein,
The pump light that the pumping source module is sent incides collimating module after forming nature polarized pump light by transport module;
Collimating module has incided inclined to one side module after nature polarized pump optical alignment is become parallel natural polarized pump light;
Play two parts linear polarization pump light that inclined to one side module divides success rate to equate parallel natural polarized pump light, respectively by inciding convergence module after the adjusting module adjustment of polarization direction;
Convergence module will converge the end face that incides crystal through the adjusted linear polarization pump light of polarization direction adjusting module.
Further, described device comprises reflecting module, two polarization direction adjusting modules and two convergence modules;
What seen through inclined to one side module in two parts linear polarization pump light that described power equates that part ofly is directly incident on a polarization direction adjusting module, by that part of another polarization direction adjusting module that incides under the guiding of reflecting module that inclined to one side module reflects;
Inject two end faces of same crystal respectively in opposite directions through convergence module through two adjusted described linear polarization pump lights of polarization direction adjusting module.
Further, described device comprises reflecting module, two polarization direction adjusting modules and two convergence modules;
What seen through inclined to one side module in two parts linear polarization pump light that described power equates that part ofly is directly incident on a polarization direction adjusting module, by that part of another polarization direction adjusting module that under reflecting module, incides that plays inclined to one side module reflection, after passing through convergence module respectively, two adjusted described linear polarization pump lights of polarization direction adjusting module incide the end face of two crystal.
Further, described inclined to one side module is a pump light polarizer.
Further, described polarization direction adjusting module is the pump light half-wave plate, adjusts the polarization direction of linear polarization pump light.
Further, described transport module is a Transmission Fibers.
Further, described collimating module comprises one or several in convex lens, concave-convex lens and the concavees lens, and described convergence module comprises one or several in convex lens, concave-convex lens and the concavees lens.
Further, described pumping source module is a laser diode.
Adopt technique scheme, the present invention has following advantage at least:
Pump arrangement with linear polarization absorption characteristic crystal of the present invention, in having the end-face pump solid laser of crystal as operation material of linear polarization absorption characteristic, existing employing added inclined to one side module and polarization direction adjusting module, improve and to have the absorption efficiency of the crystal of linear polarization absorption characteristic, thereby improve solid state laser with linear polarization absorption characteristic crystal or amplifier utilization ratio pump light to natural polarized pump light.
Description of drawings
Fig. 1 is the pumping part light path schematic diagram of existing single ended pump pumping solid laser;
Fig. 2 is the pumping part light path schematic diagram of existing both-end pumping solid state laser;
Fig. 3 is the Pu pump unit schematic diagram that the present invention adopts monocrystal both-end pumping pump mode;
Fig. 4 is the Pu pump unit schematic diagram that the present invention adopts the single-ended pumping pump mode of bicrystal.
Embodiment
Reach technological means and the effect that predetermined purpose is taked for further setting forth the present invention,, technical solution of the present invention is described in detail as follows below in conjunction with drawings and Examples.
Have the absorption efficiency of the crystal of linear polarization absorption characteristic to pump light for improving in the solid state laser, the present invention has carried out detailed design to the pump arrangement of pump light.
As shown in Figure 3, have the pump arrangement of linear polarization absorption characteristic crystal, comprising: pumping source module 1, transport module 2, collimating module 3, an inclined to one side module 4, polarization direction adjusting module 5, convergence module 6, crystal 7 and reflecting module 8, wherein,
Transport module 2 can be Transmission Fibers, and its effect is the pump light that transmission pumping source module 1 sends, and forms nature polarized pump light after its transmission.
Collimating module 3 comprises one or several in convex lens, concave-convex lens and the concavees lens, and described convergence module comprises one or several in convex lens, concave-convex lens and the concavees lens.Can make up according to actual needs, as long as the effect that can reach collimation and converge.
Playing inclined to one side module 4 is a pump light polarizer.Polarizer adopts the Brewster's angle modes of emplacement just can reach inclined to one side effect.
The crystal of crystal 7 for having the linear polarization absorption characteristic, as: Nd:YVO
4, Nd:GaVO
4, Nd:YLF, YAP etc.
Polarization direction adjusting module 5 can be the pump light half-wave plate, its effect be will be adjusted into by the polarization direction of playing two parts linear polarization pump light that inclined to one side module 4 forms consistent with the highest polarization direction of crystal 7 absorption efficiencies.
The above-mentioned course of work with pump arrangement of linear polarization absorption characteristic crystal is:
At first, the pump light that pumping source module 1 is sent forms nature polarized pump light by transport module 2 transmission backs, incides collimating module 3.Collimating module 3 becomes parallel natural polarized pump light to incide inclined to one side module 4 the natural polarized pump optical alignment of incident, obtains two parts linear polarization pump light that power equates after having passed through inclined to one side module 4 transmissions and reflection, follow-uply incides in the crystal 7 after adjusting.
That part of linear polarization pump light that has seen through inclined to one side module 4 incides a polarization direction adjusting module 5, regulate the polarization direction of this part linear polarization pump light by polarization direction adjusting module 5, the polarization direction that the polarization direction that makes adjusted linear polarization pump light and crystal 7 absorption efficiencies are the highest is consistent, by convergence module 6 this part pump light is converged an end face that enters crystal 7 again and carries out pumping.
If adopt monocrystal both-end pumping mode, then as shown in Figure 3, be inducted into reflecting module 8 by a that part of linear polarization pump light that plays inclined to one side module 4 reflections and be mapped to another polarization direction adjusting module 5, regulate the polarization direction of this part linear polarization pump light by polarization direction adjusting module 5, the polarization direction that the polarization direction that makes adjusted linear polarization pump light and crystal 7 absorption efficiencies are the highest is consistent, by convergence module 6 the linear polarization pump light is converged another end face that enters same crystal 7 again and carries out pumping.
If adopt the single-ended pump mode of bicrystal, then as shown in Figure 4, by playing that part of linear polarization pump light that inclined to one side module 4 reflects, be inducted into reflecting module 8 and be mapped to another polarization direction adjusting module 5 and convergence module 6, finally an end face at another piece crystal 7 converges pumping.
The advantage that the present invention had:
One, this linear polarization pumping configuration to having the solid laser crystal of linear polarization absorption characteristic crystal, can fully effectively utilize pump light, thereby improves the delivery efficiency of solid state laser.
Two, this pump arrangement applied range is applicable to solid state laser and amplifier.
By the explanation of embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet appended diagram only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Claims (6)
1. pump arrangement with linear polarization absorption characteristic crystal comprises: pumping source module, transport module, collimating module, play inclined to one side module, two polarization direction adjusting modules, two convergence modules, reflecting module and crystal, wherein,
The pump light that the pumping source module is sent incides collimating module after forming nature polarized pump light by transport module;
Collimating module has incided inclined to one side module after nature polarized pump optical alignment is become parallel natural polarized pump light;
Play two parts linear polarization pump light that inclined to one side module divides success rate to equate parallel natural polarized pump light, what seen through inclined to one side module in two parts linear polarization pump light that described power equates that part ofly is directly incident on a polarization direction adjusting module, by that part of another polarization direction adjusting module that under reflecting module, incides that plays inclined to one side module reflection, after passing through convergence module respectively, two adjusted described linear polarization pump lights of polarization direction adjusting module incide two end faces of crystal.
2. according to the described pump arrangement of claim 1, it is characterized in that described inclined to one side module is a pump light polarizer with linear polarization absorption characteristic crystal.
3. according to the described pump arrangement of claim 1, it is characterized in that described polarization direction adjusting module is the pump light half-wave plate, adjust the polarization direction of linear polarization pump light with linear polarization absorption characteristic crystal.
4. according to the described pump arrangement of claim 1, it is characterized in that described transport module is a Transmission Fibers with linear polarization absorption characteristic crystal.
5. according to the described pump arrangement of claim 1 with linear polarization absorption characteristic crystal, it is characterized in that, described collimating module comprises one or several in convex lens, concave-convex lens and the concavees lens, and described convergence module comprises one or several in convex lens, concave-convex lens and the concavees lens.
6. according to the described pump arrangement of claim 1, it is characterized in that described pumping source module is a laser diode with linear polarization absorption characteristic crystal.
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| CN 201010560686 CN102064459B (en) | 2010-11-26 | 2010-11-26 | Pump device with crystals having linear polarization absorption characteristic |
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| CN 201010560686 CN102064459B (en) | 2010-11-26 | 2010-11-26 | Pump device with crystals having linear polarization absorption characteristic |
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| CN102064459B true CN102064459B (en) | 2013-07-24 |
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| CN104242038A (en) * | 2014-09-24 | 2014-12-24 | 福建福晶科技股份有限公司 | Optical fiber laser frequency doubling device |
| CN107306006A (en) * | 2016-04-18 | 2017-10-31 | 长春理工大学 | A kind of 1.9 1 μm of Tm of polarization both-end pumping in the same direction:YLF laser |
| CN113839296B (en) * | 2021-08-18 | 2024-04-05 | 大族激光科技产业集团股份有限公司 | Wavelength locking LD resonance pumping picosecond amplifier |
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| JPH04196376A (en) * | 1990-11-28 | 1992-07-16 | Hitachi Ltd | Laser excitation solid-state laser device |
| DE19603704B4 (en) * | 1995-02-15 | 2009-04-09 | Carl Zeiss | Optically pumped laser with polarization-dependent absorption |
| CN102136670A (en) * | 2011-01-27 | 2011-07-27 | 山西大学 | Double-end end-pumped solid laser based on polarization coupling |
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