CN102891431A - Solid laser oscillator capable of outputting annular laser distribution - Google Patents
Solid laser oscillator capable of outputting annular laser distribution Download PDFInfo
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- CN102891431A CN102891431A CN2012103519302A CN201210351930A CN102891431A CN 102891431 A CN102891431 A CN 102891431A CN 2012103519302 A CN2012103519302 A CN 2012103519302A CN 201210351930 A CN201210351930 A CN 201210351930A CN 102891431 A CN102891431 A CN 102891431A
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Abstract
The invention discloses a solid laser oscillator capable of outputting an annular laser distribution. The solid laser oscillator comprises two pumping sources, wherein pump light emitted by each pump source is reshaped through a coupling system and then input to both ends of a laser gain medium; the laser is emitted inside from one end of the laser gain medium and outside from the other end of the laser gain medium; an inward emitting end of the laser is provided with a rear cavity mirror, a thin film capable of highly reflecting the laser is plated on the rear cavity mirror; an outward emitting end of the laser is provided with an output mirror, and a thin film with a certain transmittance on the laser is plated on the output mirror. The space distribution of pump light and laser of the solid laser in the laser gain medium can be respectively controlled by the coupling system and the rear cavity mirror; under the condition that the beam waist of the pump light is larger than the beam waist of the laser base die, no extra optical element is needed, and the annularly distributed laser output can be obtained.
Description
Technical field
The invention belongs to the laser technique field, relate to a kind of laser, particularly a kind ofly can export the circular photodistributed solid laser oscillator that swashs.
Background technology
Circular laser is a kind of non-basic mode, and spatial distribution presents the laser that axial symmetry and central light strength are weak, the edge light intensity is strong.Near the distribution of circular laser power density focus is substantially even, can adopt the flight optical system of processing than large scale, and the digital control system that is equipped with five-axle linkage can be carried out three-dimensional laser cutting and welding etc. in a big way.
Solid state laser especially has very important application at industrial circles such as laser cutting, etching and welding and microelectronics processing because its compact conformation, efficient are high, steady performance in recent years.Yet the method that obtains at present circular laser mainly is based on CO
2Laser.In order to obtain axially symmetrical circular laser, usually will be at CO
2Insert axially symmetrical optical element, for example conical Effect of Back-Cavity Mirror or conical Brewster window in the resonant cavity of laser.But this method can be introduced problems such as decrease in efficiency and polarization selectivity deterioration.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide and a kind ofly can export the circular photodistributed solid laser oscillator that swashs, this laser has the circular laser of output, advantage simple in structure, practical.
To achieve these goals, the technical solution used in the present invention is:
A kind ofly can export the circular photodistributed solid laser oscillator that swashs, comprise two pumping sources 1, the pump light 6 that each pumping source 1 sends all carries out inputing to respectively after the shaping two ends of gain medium 5 again by a coupled system 3, laser 7 enters from an end-fire of gain medium 5, the other end penetrates, the end of injecting of laser 7 arranges Effect of Back-Cavity Mirror 8, be coated with the film to the high reflection of laser on the Effect of Back-Cavity Mirror 8, ejecting end at laser 7 arranges outgoing mirror 9, is coated with the film that laser is had certain transmitance on the outgoing mirror 9.
Described pumping source 1 is fiber coupled laser diode or collimation output semiconductor laser, and pump mode is end pumping or profile pump.
Also comprise tilting dichroic mirror 4 on pump light 6 and laser 7 light paths, the 6 high transmissions of 4 pairs of pump lights of dichroic mirror, to laser 7 high reflections, described pump light 6 is after coupled system 3 shapings, then be input to gain medium 5 through dichroic mirror 4 transmissions again, laser 7 is input to gain medium 5 after dichroic mirror 4 reflections.
The pump light 6 that 3 pairs of pumping sources 1 of described coupled system send carries out shaping makes pump light 6 spatially have the uniform angle of divergence and the distribution of axisymmetric hot spot.
The absorption spectra coupling of the emission spectra of described pumping source 1 and described gain medium 5.
Described gain medium 5 is comprised of at least one block of doping laser crystal, and described laser crystal comprises one or more doped regions.
Described gain medium 5 is the Nd:YVO4 crystal.
Described pump light 6 and laser 7 are rectangle at the plane of incidence of gain medium 5.
The chamber type of this solid laser oscillator is straight chamber, refrative cavity or annular chamber, perhaps at the chamber mirror of the direct plated film in the surface of laser crystal as resonant cavity.
Ejecting end at laser 7 arranges periodically loss modulation device 10, penetrates to reenter after light is exported by periodicity loss modulation device 10 acquisition pulse lasers to be incident upon outgoing mirror 9, and described periodicity loss modulation device 10 is active and passive Q-adjusted device.
The solid state laser that the present invention proposes, pump light and the laser spatial distribution in gain medium can be controlled respectively by coupled system and chamber mirror, satisfying under the pump light condition with a tight waist greater than the laser basic mode with a tight waist, need not to add extra optical element, just can obtain the Laser output of circular distribution.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the present of invention.
Fig. 2 is for embodiment, the schematic diagram that surperficial pump light and laser distribute in the gain medium the inside.
Fig. 3 is doped region structural representation behind the middle bonding of the present invention.
Fig. 4 is the rectangular cross section schematic diagram of B-B section among Fig. 3.
Fig. 5 is the circular cross section schematic diagram of B-B section among Fig. 3.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further details.
Fig. 1 is an embodiment that can export circular sharp photodistributed solid laser oscillator provided by the invention.The pump light 6 of pumping source 1 output conducts to coupled system 3 by tail optical fiber 2, the 6 high transmissions of 4 pairs of pump lights of dichroic mirror, to laser 7 high reflections, pump light 6 is by coupled system 3 shapings, coupled system 3 is formed by several lens combinations, pump light 6 can be shaped to and spatially have the uniform angle of divergence and axisymmetric hot spot and distribute, the pump light 6 after the shaping injects in the gain mediums 5 through dichroic mirror 4, and the center of gain medium 5 is part with a tight waist.The resonant cavity of laser oscillator is made of Effect of Back-Cavity Mirror 8 and outgoing mirror 9 and dichroic mirror 4, and the pulse modulation device 10 in the chamber is used for the periodically-varied cavity loss, produces pulse output.The gain medium 5 of oscillator is the Nd:YVO4 crystal, and it is subjected to absorption coefficient large, excites that to be excited to penetrate the cross section large, the upper laser level life-span is little, therefore larger gain can be arranged, and is easy to the high repetition frequency running, it is birefringece crystal simultaneously, can obtain polarization output.
For this embodiment, Fig. 2 represents the schematic diagram that pump light and basic mode laser distribute in the gain medium the inside.The basic mode greater than laser 7 with a tight waist of pump light 6 is with a tight waist, causes having a large amount of counter-rotating particles beams can't be extracted by laser the laser of the non-basic mode that vibrates at radius greater than laser 7 basic modes zone with a tight waist.Simultaneously, the pump light 6 of coupling fiber output is own axially symmetrical, and the laser 7 of vibration output also presents axially symmetrical.Thereby, can obtain non-basic mode, axially Laser output symmetrical and that the center is strong, the edge is strong.
In above-described embodiment, gain medium 5 is made of solid laser material, and its cross section adopts rectangle or square, the center that is positioned at gain medium 5 with a tight waist of endovenous laser 7.Gain medium 5 is comprised of at least one block of doping laser crystal, and laser crystal can comprise one or more doped regions, as shown in Figure 3, comprises a doped region 17 at the core of gain medium 5, is dopant material not all around.The cross section of doped region 17 can be rectangle (as shown in Figure 4), and perhaps circular (as shown in Figure 5) can also be other shape.Wherein the gain medium 5 of laser oscillator can also be optical fiber.
The center that is positioned at gain medium 5 with a tight waist of endovenous laser 7 of the present invention, and spot size with a tight waist is subject to Effect of Back-Cavity Mirror 8 and outgoing mirror 9 to the distance affects of gain medium 5, thereby by regulating Effect of Back-Cavity Mirror 8 and outgoing mirror 9, just can realize the size adjustment that endovenous laser is with a tight waist.
Utilize the present invention to obtain to be two kinds of approach of the Laser output of circular distribution:
Adjust size with a tight waist and beam waist position in the gain medium 5 by adjusting described coupled system 3 control pump lights 6, make the basic mode greater than laser 7 with a tight waist of pump light 6 described in the described gain medium 5 with a tight waist, to obtain a kind of Laser output that is circular distribution.
By adjusting described chamber mirror, can control the basic mode of described laser 7 in described gain medium 5 size with a tight waist and basic mode beam waist position, make the basic mode of laser 7 described in the described gain medium 5 with a tight waist less than described pump light 6 with a tight waist, to obtain a kind of Laser output that is circular distribution.
Laser oscillator can adopt the laser of various chambeies type in above-described embodiment, such as straight chamber, refrative cavity, annular chamber etc., can adopt various pumping sources and the various pump modes such as semiconductor laser, photoflash lamp.Here select straight chamber and semiconductor laser end pumping mode just as a convenient embodiment who illustrates of the present invention.
Claims (10)
1. can export the circular photodistributed solid laser oscillator that swashs for one kind, it is characterized in that, comprise two pumping sources (1), the pump light (6) that each pumping source (1) sends all carries out inputing to respectively after the shaping two ends of gain medium (5) again by a coupled system (3), laser (7) enters from an end-fire of gain medium (5), the other end penetrates, the end of injecting of laser (7) arranges Effect of Back-Cavity Mirror (8), be coated with the film to the high reflection of laser on the Effect of Back-Cavity Mirror (8), ejecting end at laser (7) arranges outgoing mirror (9), and outgoing mirror is coated with the film that laser is had certain transmitance on (9).
2. solid laser oscillator according to claim 1 is characterized in that, described pumping source (1) is fiber coupled laser diode or collimation output semiconductor laser, and pump mode is end pumping or profile pump.
3. solid laser oscillator according to claim 1, it is characterized in that, also comprise tilting dichroic mirror (4) on pump light (6) and laser (7) light path, dichroic mirror (4) is to the high transmission of pump light (6), to the high reflection of laser (7), described pump light (6) then is input to gain medium (5) through dichroic mirror (4) transmission again after coupled system (3) shaping, laser (7) is input to gain medium (5) after dichroic mirror (4) reflection.
4. according to claim 1 or 3 described solid laser oscillators, it is characterized in that, the pump light (6) that described coupled system (3) sends pumping source (1) carries out shaping makes pump light (6) spatially have the uniform angle of divergence and the distribution of axisymmetric hot spot.
5. solid laser oscillator according to claim 1 is characterized in that, the absorption spectra coupling of the emission spectra of described pumping source (1) and described gain medium (5).
6. solid laser oscillator according to claim 1 is characterized in that, described gain medium (5) is comprised of at least one block of doping laser crystal, and described laser crystal comprises one or more doped regions.
7. solid laser oscillator according to claim 1 is characterized in that, described gain medium (5) is Nd:YVO
4Crystal.
8. solid laser oscillator according to claim 1 is characterized in that, described pump light (6) and laser (7) are rectangle at the plane of incidence of gain medium (5).
9. solid laser oscillator according to claim 1 is characterized in that, the chamber type of this solid laser oscillator is straight chamber, refrative cavity or annular chamber, perhaps at the chamber mirror of the direct plated film in the surface of laser crystal as resonant cavity.
10. solid laser oscillator according to claim 1, it is characterized in that, ejecting end at laser (7) arranges periodically loss modulation device (10), penetrate light and be incident upon outgoing mirror (9) by reentering after periodically loss modulation device (10) acquisition pulse laser is exported, described periodicity loss modulation device (10) is active and passive Q-adjusted device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103519302A CN102891431A (en) | 2012-02-09 | 2012-09-20 | Solid laser oscillator capable of outputting annular laser distribution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100288293A CN102593707A (en) | 2012-02-09 | 2012-02-09 | Solid laser oscillator capable of outputting laser distributed in circular ring-shaped |
| CN201210028829.3 | 2012-02-09 | ||
| CN2012103519302A CN102891431A (en) | 2012-02-09 | 2012-09-20 | Solid laser oscillator capable of outputting annular laser distribution |
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| CN2012103519302A Pending CN102891431A (en) | 2012-02-09 | 2012-09-20 | Solid laser oscillator capable of outputting annular laser distribution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224288A (en) * | 2019-07-04 | 2019-09-10 | 南京信息工程大学 | A kind of 2 based on pyramid chamber μm Gao Zhongying tunable single frequency solid state laser device |
| CN112928587A (en) * | 2021-01-25 | 2021-06-08 | 中国科学院上海光学精密机械研究所 | Laser oscillator for generating light spots in any shapes |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593707A (en) * | 2012-02-09 | 2012-07-18 | 清华大学 | Solid laser oscillator capable of outputting laser distributed in circular ring-shaped |
| CN107221832A (en) * | 2017-08-01 | 2017-09-29 | 南京先进激光技术研究院 | A kind of U-shaped cavity laser that can efficiently debug and its adjustment method |
| CN111884031B (en) * | 2020-07-07 | 2021-06-15 | 深圳市海目星激光智能装备股份有限公司 | Optimization method and optimization system for roundness of laser spot |
| CN117277038A (en) * | 2023-11-21 | 2023-12-22 | 武汉光谷航天三江激光产业技术研究院有限公司 | Single-end pumping airborne pulse laser based on double-crystal serial connection and control method |
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| DE10226280A1 (en) * | 2002-06-13 | 2004-01-08 | Joachim Franek | Beam guidance element has reflective surfaces for generating hollow beam from solid beam (or vice-versa) has odd number of reflective surfaces used for beam deflection |
| CN1905295A (en) * | 2005-07-29 | 2007-01-31 | 深圳市大族激光科技股份有限公司 | Semiconductor double end face pumping Nd:YV04 high power single-mode solid laser |
| CN101950915A (en) * | 2010-09-07 | 2011-01-19 | 长春理工大学 | Resonant cavity capable of obtaining hollow laser beams |
| CN102570262A (en) * | 2012-02-29 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Hollow ring-shaped light beam output solid laser and using method therefor |
| CN102593707A (en) * | 2012-02-09 | 2012-07-18 | 清华大学 | Solid laser oscillator capable of outputting laser distributed in circular ring-shaped |
-
2012
- 2012-02-09 CN CN2012100288293A patent/CN102593707A/en active Pending
- 2012-09-20 CN CN2012103519302A patent/CN102891431A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10226280A1 (en) * | 2002-06-13 | 2004-01-08 | Joachim Franek | Beam guidance element has reflective surfaces for generating hollow beam from solid beam (or vice-versa) has odd number of reflective surfaces used for beam deflection |
| CN1905295A (en) * | 2005-07-29 | 2007-01-31 | 深圳市大族激光科技股份有限公司 | Semiconductor double end face pumping Nd:YV04 high power single-mode solid laser |
| CN101950915A (en) * | 2010-09-07 | 2011-01-19 | 长春理工大学 | Resonant cavity capable of obtaining hollow laser beams |
| CN102593707A (en) * | 2012-02-09 | 2012-07-18 | 清华大学 | Solid laser oscillator capable of outputting laser distributed in circular ring-shaped |
| CN102570262A (en) * | 2012-02-29 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Hollow ring-shaped light beam output solid laser and using method therefor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224288A (en) * | 2019-07-04 | 2019-09-10 | 南京信息工程大学 | A kind of 2 based on pyramid chamber μm Gao Zhongying tunable single frequency solid state laser device |
| CN112928587A (en) * | 2021-01-25 | 2021-06-08 | 中国科学院上海光学精密机械研究所 | Laser oscillator for generating light spots in any shapes |
| CN112928587B (en) * | 2021-01-25 | 2022-09-02 | 中国科学院上海光学精密机械研究所 | Laser oscillator for generating light spot with any shape |
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| CN102593707A (en) | 2012-07-18 |
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