CN103326226B - A kind of laser pumping apparatus - Google Patents
A kind of laser pumping apparatus Download PDFInfo
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- CN103326226B CN103326226B CN201310230943.9A CN201310230943A CN103326226B CN 103326226 B CN103326226 B CN 103326226B CN 201310230943 A CN201310230943 A CN 201310230943A CN 103326226 B CN103326226 B CN 103326226B
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Abstract
The invention discloses a kind of laser pumping apparatus, the pump light that pump light source module produces is divided into the orthogonal two-way pump light in polarization direction through polarization separation module after transport module transmission, wherein the annular beam that obtains after light distortion resume module of a road pump light and another road pump light carry out in light beam synthesis module space close restraint after input convergence module, the pump light after closing bundle converges in laser crystal by convergence module.The present invention is applied to pump light source and adopts photoconduction transmission and will have linear polarization absorption characteristic crystal as in the end-face pump solid laser of working-laser material, a branch of natural light beam can be made to become a branch of linearly polarized light beam, regulated and light beam synthesis by polarization separation, polarization direction, under keeping the condition of pumping light power and uniform spatial distribution to the full extent, improve the laser crystal with linear polarization absorption characteristic to inject and homogenize the power of pump light, thus greatly optimize laser design.
Description
Technical field
The present invention relates to technical field of solid laser, particularly relates to a kind of laser pumping apparatus.
Background technology
The kind of laser has a variety of, and in the pump mode adopted as the pumping source of laser at laser diode, the advantages such as end pumping mode has that pumping configuration is simple, coupling efficiency is high, pump beam and cavity mode matching better, easily obtain better beam quality, threshold value is low, become a kind of pump mode that laser technology field comparatively generally adopts.Nineteen eighty-two K.Kubodera, J.Noda, Applied Optics the 21st volume describes one fibre coupled laser diode end-face pump solid laser, each light source is furnished with corresponding condenser lens and a light guide optical fiber transmits, each fiber-optic output is also furnished with lens and converges pump light, and these unit are arranged in taper pumping at a certain angle and enter a rod-shaped laser crystal.This structure becomes the main way adopted in end pumping, and this makes the laser diode module being with tail optical fiber to export become a kind of important pumping source.
As everyone knows, a class is had to have polarization absorption characteristic laser crystal as Nd:YVO to pump light
4, Nd:YLF, Nd:YAP etc., and the laser crystal in Chang Zuowei end-pumped laser.The laser diode module exported according to band tail optical fiber does pumping source, then will affect the efficiency of the Output of laser of laser.Photoconduction, especially light guide optical fiber and fiber bundle, although there is characteristic flexibly in use and geometry, more be conducive to the connection between pump light source and laser crystal, but for the laser crystal of above-mentioned characteristic, this transmission just has more meaning under then wanting to keep pump light polarization characteristic condition.
A kind of pumping configuration is also described in prior art, polarizing beam splitter is divided into two bunch polarised lights by the pump light that photoconduction exports, to wherein converge from two ends respectively after regulating 90 ° carry out pumping in laser crystal in a branch of polarization direction, although this makes laser crystal improve pump light absorption efficiency, but the power injecting a laser crystal end face is only a part for pump light source gross power, reduces the injection of laser crystal at an end face inside-pumping light; Same walking abreast backward is adjusted to enter a lens ethod of remittance two-beam separated although also adopt, achieve the gross power injected at an end face not reduce, but the distribution of pump light in laser crystal can not be mated very well with zlasing mode, do not reach comparatively ideal state in laser design.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of laser pumping apparatus, improves and has linear polarization absorption characteristic crystal to the injection of pump light and homogenize.
The technical solution used in the present invention is, described laser pumping apparatus, comprising: pump light source module, transport module, polarization separation module, polarization direction adjustment module, light distortion module, light beam synthesis module and convergence module, wherein,
The pump light that pump light source module produces is divided into the orthogonal two-way pump light in polarization direction through polarization separation module after transport module transmission, wherein the annular beam that obtains after light distortion resume module of a road pump light and another road pump light carry out in light beam synthesis module space close restraint after input convergence module, the pump light after closing bundle converges in laser crystal by convergence module;
For the two-way pump light that polarization separation module exports, before input convergence module, by polarization direction adjustment module, two-way pumping polarisation of light direction is adjusted to consistent with the polarization absorption direction of laser crystal.
Further, described device also comprises: optical path direction adjusting module, for changing the transmission direction of light path as required, makes the light beam after adjustment enter light beam synthesis module.
Further, described device also comprises: collimating module; The pump light that pump light source module produces is transferred to collimating module through transport module, then by collimating module, pump light is collimated into a branch of directional light and is input to polarization separation module.
Further, described transport module is light guide optical fiber or fiber bundle.
Further, described collimating module and described convergence module all adopt one or several the combination in convex lens, concave-convex lens and concavees lens.
Further, described polarization separation module is the polarizer of a pump wavelength or is the polarization splitting prism of a pump wavelength.
Further, described polarization direction adjustment module comprises a pump light half-wave plate between polarization separation module and light beam synthesis module and a pump light half-wave plate between light beam synthesis module and convergence module; Or described polarization direction adjustment module comprises the pump light half-wave plate laid respectively between polarization separation module and light beam synthesis module in two light paths.
Further, described light distortion module comprises: the taper type concave mirror that cone angle is placed in the same way and be arranged in a taper convex reflecting mirror of this taper type concave mirror; Or a bottom surface is provided with the taper type prism of conical indentation; Or,
Described light distortion module comprises: the taper type concave mirror that cone angle is staggered relatively and be positioned at the taper concave mirror at this back side; Or a bottom surface is provided with the taper type prism of pyramidal projections; Or,
Described light distortion module comprises: the cone prism that cone angle is staggered relatively and a taper type concave mirror; Or,
Described light distortion module comprises: two cone prism that cone angle is staggered relatively;
The hollow area of the annular beam obtained after described light distortion resume module is equal with incident beam cross section area and shape is identical.
Further, described light beam synthesis module carries out transmission in tunnel to optic path direction Na mono-consistent with laser crystal incident direction in the two-way pump light of incidence, another road is reflected, propagate in the same direction after making two-way pump light space combination, incide in laser crystal through convergence module.
Further, described light beam synthesis module is an oval angled mirrors, or a hollow position is oval angled mirrors, or the Partial angle transmissive portion angled mirrors adopting plated film mode to realize.
Adopt technique scheme, the present invention at least has following advantages:
Laser pumping apparatus of the present invention, be applied to pump light source adopt photoconduction transmission and will there is linear polarization absorption characteristic crystal as in the end-face pump solid laser of working-laser material, a branch of natural light beam can be made to become a branch of linearly polarized light beam, regulated and light beam space combination by polarization separation, polarization direction, under keeping the condition of pumping light power and uniform spatial distribution to the full extent, improve the laser crystal with linear polarization absorption characteristic to inject and homogenize the power of pump light, thus greatly optimize laser design.
Accompanying drawing explanation
Fig. 1 is the light path schematic diagram of the polarization regulative mode one of the laser pumping apparatus of the embodiment of the present invention;
Fig. 2 is the light path schematic diagram of the polarization regulative mode two of the laser pumping apparatus of the embodiment of the present invention;
Fig. 3 is the light path schematic diagram of the first composition of light distortion module of the laser pumping apparatus of the embodiment of the present invention;
Fig. 4 (a) and (b) are respectively end view and the stereogram effect schematic diagram of light distortion module the second composition structure of the laser pumping apparatus of the embodiment of the present invention;
Fig. 5 is the light path schematic diagram of the third composition of light distortion module of the laser pumping apparatus of the embodiment of the present invention;
Fig. 6 (a) and (b) are respectively end view and the stereogram effect schematic diagram of light distortion module the 4th kind composition structure of the laser pumping apparatus of the embodiment of the present invention;
Fig. 7 is the light path schematic diagram of light distortion module the 5th kind composition of the laser pumping apparatus of the embodiment of the present invention;
Fig. 8 is the light path schematic diagram of light distortion module the 6th kind composition of the laser pumping apparatus of the embodiment of the present invention;
Fig. 9 is the light path schematic diagram of the first structure of light beam synthesis module of the laser pumping apparatus of the embodiment of the present invention;
Figure 10 is the light beam synthesis module of the embodiment of the present invention is a kind of Partial angle transmissive portion angled mirrors schematic diagram adopting plated film mode to realize;
Figure 11 is the light path schematic diagram of light beam synthesis module the second structure of the laser pumping apparatus of the embodiment of the present invention;
Figure 12 is the another kind of light path schematic diagram of the laser pumping apparatus of the embodiment of the present invention;
Figure 13 is the light beam synthesis module of the embodiment of the present invention is the another kind of Partial angle transmissive portion angled mirrors schematic diagram adopting plated film mode to realize.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in detail as after.
Have in the solid state laser of the laser crystal of polarization absorption characteristic in use, in order to the effective utilization to pump light, the embodiment of the present invention has carried out detailed design to the laser pumping apparatus sending pump light.
The laser pumping apparatus of the embodiment of the present invention, as shown in Figure 1, comprising: pump light source module 1, transport module 2, collimating module 3, polarization separation module 4, polarization direction adjustment module, light distortion module 6, light beam synthesis module 7 and convergence module 9, wherein:
The pump light that pump light source module 1 produces is transferred to collimating module 3 through transport module 2, pump light is collimated into a branch of directional light and is input to polarization separation module 4 by collimating module 3, the orthogonal two-way pump light in polarization direction is divided into through polarization separation module 4, as shown in Figure 1, two-way pump light is respectively p polarised light and s polarised light, two-way pump light is circular light beam, one road pump light (the p polarised light namely in Fig. 1) annular beam that obtains and another road pump light (the s polarised light namely in Fig. 1) after light distortion module 6 processes carry out space and close to restraint and input convergence module 9 afterwards in light beam synthesis module 7, convergence module 9 converges in laser crystal 10 by closing the pump light after restrainting,
For the two-way pump light that polarization separation module 4 exports, before input convergence module 9, by polarization direction adjustment module, two-way pumping polarisation of light direction is adjusted to consistent with the polarization absorption direction of laser crystal 10.
Concrete, this laser pumping apparatus also comprises: optical path direction adjusting module 11, a road pump light for exporting polarization separation module 4 carries out optical path direction adjustment, it is made to incide in light beam synthesis module 7, optical path direction adjusting module 11 is the angled mirrors for changing optical path direction, itself and the beam exit direction of polarization separation module 4 and the reflection angle of light beam synthesis module 7 pairs of light beams match, such as: as shown in Figure 1, the beam exit direction of polarization separation module 4 is orthogonal two-beam, optical path direction adjusting module 11 is 45 ° of speculums, light beam synthesis module 7 is also the speculum of 45 °.
Pump light source module 1 is laser diode.
Transport module 2 can be light guide optical fiber or fiber bundle, is used for transmitting the pump light that pumping light source module 1 sends.
Collimating module 3 and convergence module 9 all can adopt one or several the combination in convex lens, concave-convex lens and concavees lens.Collimating module 3 is that the diverging light that transport module 2 exports is collimated into a branch of directional light; Convergence module 9 is converged in laser crystal 10 by collimated light beam.
Polarization separation module 4 is the polarizer of a pump wavelength or is the polarization splitting prism of a pump wavelength, natural polarised light is divided into two parts light of polarized orthogonal.
Be used for regulating the polarization direction adjustment module of polarization direction of polarised light, comprise a first pump light half-wave plate 5 between polarization separation module and light beam synthesis module in arbitrary light path and a second pump light half-wave plate 8 between light beam synthesis module and convergence module; Or as shown in Figure 2, polarization direction adjustment module comprises two pump light half-wave plates (5,8), lays respectively in two light paths between polarization separation module and light beam synthesis module.
As shown in Figure 3, light distortion module 6 comprises: the taper type concave mirror that cone angle is placed in the same way and be arranged in a taper convex reflecting mirror of this taper type concave mirror; Or as shown in Figure 4, a bottom surface based on the light path principle of reflection similar with Fig. 3 is provided with the taper type prism of conical indentation; Or,
As shown in Figure 5, light distortion module 6 comprises: the taper type concave mirror that cone angle is staggered relatively and be positioned at the taper concave mirror at this back side; Or, as shown in Figure 6, be provided with the taper type prism of pyramidal projections based on light path principle of reflection bottom surface similar with Fig. 5, or,
As shown in Figure 7, light distortion module 6 comprises: the cone prism that cone angle is staggered relatively and a taper type concave mirror;
As shown in Figure 8, light distortion module 6 comprises: two cone prism that cone angle is staggered relatively.
The effect of light distortion module 6 is under keeping incident beam polarization state condition, the circular light beam of incidence is changed into the annular beam of hollow, the hollow area of the annular beam obtained after light distortion module 6 processes is equal with incident circular light beam cross-sectional area and shape is identical.
Light beam synthesis module 7 carries out transmission to optic path direction in the two-way pump light of incidence with laser crystal 10 incident direction consistent Na mono-tunnel, reflects another road, makes two-way pump light spatially close Shu Houjing and crosses convergence crystal and converge in laser crystal.As shown in Fig. 1,2,9, light beam synthesis module 7 can be an oval angled mirrors, in addition, light beam synthesis module 7 can also be the Partial angle transmissive portion angled mirrors adopting plated film mode to realize, such as shown in Figure 10, left side and right side edge plating angle anti-reflection film 12, right center plating angle reflection film 13, when not affecting annular beam (by annular beam directly through) by another road pump light reflection, and in the same way coaxial with annular beam.Or, as shown in Figure 11,12, light beam synthesis module 7 also can be a hollow position is oval angled mirrors, in addition, light beam synthesis module 7 can also be the Partial angle transmissive portion angled mirrors adopting plated film mode to realize, such as shown in Figure 13, left side and right center place plating angle anti-reflection film 12, right side edge plating angle reflection film 13, when not affecting circular light beam (by circular light beam directly through) another part annular beam is reflected, and in the same way coaxial with circular light beam.
Laser crystal 10 for having the laser crystal of linear polarization absorption characteristic, as Nd:YVO
4, Nd:YLF, Nd:YAP etc.
Described in the present embodiment, the course of work of laser pumping apparatus is:
Shown in Fig. 1, first, after the pump light that pump light source module 1 sends is transmitted by transport module 2, incide collimating module 3 and be collimated into collimated light beam, incide two parts light that polarization separation module 4 is divided into cross-polarization: p polarised light (i.e. p light) and s polarised light (i.e. s light), p light through the first pump light half-wave plate 5 by polarization direction half-twist, incide light distortion module 6 and be deformed into the annular beam that hollow area is former spot size, s light regulates after optical path direction through optical path direction adjusting module 11 and enters light beam synthesis module 7 with the p light after change of polarized direction and deformation along different directions, p light after change of polarized direction and deformation passes through around oval angled mirrors, s light is in the same way coaxial with the p light after change of polarized direction and deformation by oval angled mirrors reflection, this two parts light regulates through the second pump light half-wave plate 8 and enters convergence module 9 behind polarization direction (adjustment of this polarization direction require according to laser crystal and determine) and converge, then incide in laser crystal 10, so far pumping is completed.
The advantage that the present invention has:
One, the structure of this laser pumping apparatus, to the solid laser crystal with linear polarization absorption characteristic crystal, improves laser crystal to Pumping light absorption, thus improves the delivery efficiency of solid state laser.
Two, the structure of this laser pumping apparatus is while raising laser crystal is to effective utilization of pump light, can keep the uniformity of spatial distribution.
Three, this laser pumping apparatus applied range, is applicable to the end pumping structure in solid state laser and amplifier.
By the explanation of embodiment, should to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, but appended diagram be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
Claims (10)
1. a laser pumping apparatus, is characterized in that, comprising: pump light source module, transport module, polarization separation module, polarization direction adjustment module, light distortion module, light beam synthesis module and convergence module, wherein,
The pump light that pump light source module produces is divided into the orthogonal two-way pump light in polarization direction through polarization separation module after transport module transmission, wherein a road pump light is changed into the annular beam of hollow after light distortion resume module by circular light beam, the hollow area of this annular beam is equal with the cross-sectional area of this incident circular light beam and shape is identical, this annular beam and another road pump light carry out in light beam synthesis module space close restraint after input convergence module, convergence module by close bundle after pump light converge in laser crystal;
For the two-way pump light that polarization separation module exports, before input convergence module, by polarization direction adjustment module, two-way pumping polarisation of light direction is adjusted to consistent with the polarization absorption direction of laser crystal.
2. laser pumping apparatus according to claim 1, is characterized in that, described device also comprises: optical path direction adjusting module, for changing the transmission direction of light path as required, makes the light beam after adjustment enter light beam synthesis module.
3. laser pumping apparatus according to claim 1, is characterized in that, described device also comprises: collimating module; The pump light that pump light source module produces is transferred to collimating module through transport module, then by collimating module, pump light is collimated into a branch of directional light and is input to polarization separation module.
4. laser pumping apparatus according to claim 3, is characterized in that, described transport module is light guide optical fiber or fiber bundle.
5. laser pumping apparatus according to claim 3, is characterized in that, described collimating module and described convergence module all adopt one or several the combination in convex lens, concave-convex lens and concavees lens.
6. laser pumping apparatus according to claim 1, is characterized in that, described polarization separation module is the polarizer of a pump wavelength or is the polarization splitting prism of a pump wavelength.
7. laser pumping apparatus according to claim 1, it is characterized in that, described polarization direction adjustment module comprises a pump light half-wave plate between polarization separation module and light beam synthesis module and a pump light half-wave plate between light beam synthesis module and convergence module; Or,
Described polarization direction adjustment module comprises two pump light half-wave plates, lays respectively in two light paths between polarization separation module and light beam synthesis module.
8. laser pumping apparatus according to claim 1, is characterized in that, described light distortion module comprises: the taper type concave mirror that cone angle is placed in the same way and be arranged in a taper convex reflecting mirror of this taper type concave mirror; Or a bottom surface is provided with the taper type prism of conical indentation; Or,
Described light distortion module comprises: the taper type concave mirror that cone angle is staggered relatively and be positioned at the taper concave mirror at the back side; Or a bottom surface is provided with the taper type prism of pyramidal projections, or,
Described light distortion module comprises: the cone prism that cone angle is staggered relatively and a taper type concave mirror, or,
Described light distortion module comprises: two cone prism that cone angle is staggered relatively.
9. the laser pumping apparatus according to any one of claim 1 ~ 8, it is characterized in that, described light beam synthesis module carries out transmission in tunnel to light path Na mono-consistent with laser crystal incident direction in the two-way pump light of incidence, another road is reflected, propagate in the same direction after making two-way pump light space combination, incide in laser crystal through convergence module.
10. laser pumping apparatus according to claim 9, it is characterized in that, described light beam synthesis module is an oval angled mirrors, or a hollow position is oval angled mirrors, or the Partial angle transmissive portion angled mirrors adopting plated film mode to realize.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103594910A (en) * | 2013-11-28 | 2014-02-19 | 长春理工大学 | Solid laser for end face pumping through annular light |
| US11258230B2 (en) * | 2017-11-08 | 2022-02-22 | Lumentum Operations Llc | Pump isolation by polarization splitting |
| JP7354060B2 (en) * | 2019-06-20 | 2023-10-02 | ルーメンタム オペレーションズ エルエルシー | Rotating beam symmetrizer |
| CN113325592A (en) * | 2021-06-03 | 2021-08-31 | 广东省科学院半导体研究所 | Light beam converging device and light emitting system |
| CN114279346B (en) * | 2021-12-18 | 2024-04-16 | 上海精测半导体技术有限公司 | Optical measurement device, optical measurement method, and photoacoustic film thickness measurement system |
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| US8130800B2 (en) * | 2006-05-17 | 2012-03-06 | Battelle Memorial Institute | Mode-locked solid state lasers using diode laser excitation |
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| 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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