CN105305222A - Raman laser capable of outputting variable-obscuration-ratio annular beam - Google Patents
Raman laser capable of outputting variable-obscuration-ratio annular beam Download PDFInfo
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- CN105305222A CN105305222A CN201410363668.2A CN201410363668A CN105305222A CN 105305222 A CN105305222 A CN 105305222A CN 201410363668 A CN201410363668 A CN 201410363668A CN 105305222 A CN105305222 A CN 105305222A
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Abstract
The invention discloses a Raman laser capable of outputting a variable-obscuration-ratio annular beam. The Raman laser comprises a reflector 1, a laser crystal, a dichroscope, a Raman cell, a reflector 2, a reflector 3 and a scraper mirror, which form two negative-branch confocal unstable resonators, which are partially common and different in magnification. Pump laser is generated in the resonators through oscillation and is focused to a Raman medium pool to reach a Raman laser emission threshold; the Raman laser outputs the annular beam, of which the external diameter/ inner diameter ratio (obscuration ratio) can be adjusted based on ratio of curvature radius of a concave mirror 3 and a concave mirror 2, through the negative-branch confocal unstable resonators. The provided laser outputs the annular laser beam; the efficiency thereof is similar to that of the intra-cavity Raman laser, and the obscuration ratio thereof can be adjusted; and the Raman laser is very suitable for carrying out remote transmission through a transmitting telescope.
Description
Technical field
The invention belongs to laser technology field, more specifically relate to a kind of Raman laser.
Background technology
Laser crystal, such as Nd:YAG, Nd:YVO
4deng, and gaseous state operation material such as CO
2, N
2, the system such as Ar, He-Ne can be used for producing laser beam.Usual laser provides one or several fixing wavelength, when other wavelength of needs, just needs to use frequency shifting techniques.Raman laser is a kind of laser containing frequency shifting techniques, modal is solid Roman laser, such as laser crystal and Raman frequency shift crystal are together placed in laserresonator and form Raman laser in chamber, laser crystal and Raman frequency shift crystal also can be same crystal.Gas Raman active medium also can be used for making Raman laser, and it can have higher damage threshold to compare solid, but it is also higher to go out photo threshold, is therefore more suitable for the excited Raman frequency conversion of superlaser.
The light beam that common laser produces is Gaussian laser beam, has the spot intensity distribution that central bright edge is gradually dark.Such light distribution often comes from stable resonator.But such structure, has the generation of high-order transverse mode usually, has influence on the beam quality of laser, thus has influence on follow-up application.At this time need to take means to suppress high-order transverse mode.And for unstable laser resonant cavity, high-order transverse mode is difficult to existence usually.In addition, in some fields, annular laser beams instead of Gaussian laser beam is needed to play a role.
Summary of the invention
For above-mentioned technical barrier, target of the present invention is to provide a kind of Raman laser exporting variable the ratio of obstruction annular beam, and with solving gas, Raman laser goes out the high problem of photo threshold, provides the annular laser beams of high light beam quality to export simultaneously.
The present invention is made up of concave mirror one, laser crystal, dichroscope, Raman pond, concave mirror two and concave mirror three, and concave mirror one and concave mirror two are oppositely arranged, and forms a negative branch confocal unstable resonator; From the optical axis of concave mirror one to concave mirror two, laser crystal, dichroscope and Raman pond is placed with successively in confocal unstable resonator.
Concave mirror three is arranged at outside negative branch confocal unstable resonator, and the optical axis of dichroscope and negative branch confocal unstable resonator is that miter angle is put; Concave mirror three and the mirror image of concave mirror two in dichroscope form another confocal unstable resonator.
Further, laser crystal accepts side direction lamp pump to produce laser generation between concave mirror one and concave mirror two.
Further, Raman pond is placed in the real focus of concave mirror two optical axis front, and obviously laser intensity is the strongest herein.
Further, the optical axis diameter projected of dichroscope is identical with concave mirror two, and its laser-light transparent that laser crystal is produced, and to the raman laser total reflection that Raman medium in Raman pond produces.
Further, the focal length of concave mirror three is longer than concave mirror one, its focus obviously also with the overlapping of concave mirror two, and concrete focal length and minute surface size can unrestricted choice.
Further, the raman laser of generation is exported by the dichroscope edge ring pencil of forms, also can add 45 degree of scraper mirrors and export.
That these elements constitute 2 partial commons, that magnification ratio is different negative branch confocal unstable resonator, pumping laser vibrates generation in chamber, and is focused in Raman medium pool and launches threshold value to reach raman laser; Raman laser is by negative branch confocal unstable resonator output ring shaped light beam, and its external diameter internal diameter ratio (the ratio of obstruction) can be regulated with the ratio of the radius of curvature of concave mirror two by concave mirror three.Laser provided by the invention exports annular laser beams, and in efficiency and chamber, Raman laser is similar, and the ratio of obstruction can regulate, and is very beneficial for carrying out remote transmission by transmitter-telescope.
The Raman laser of output provided by the invention variable the ratio of obstruction annular beam can produce raman laser under relatively low injection pumping optical condition; Intracavity wavelength beam splitter employs dichroscope, and present deielectric-coating dichroscope has larger damage threshold, usually at 100MW/cm
2the order of magnitude.And raman laser vibrates and exports in confocal unstable resonator, its good beam quality, and the outer internal diameter ratio (the ratio of obstruction) of the annular laser beams exported and outgoing laser beam direction also can regulate.If increase endovenous laser power, export pulse laser, Q-switch can be used in pumping light path, not draw here.
Accompanying drawing explanation
Fig. 1: a kind of Raman laser exporting variable the ratio of obstruction annular beam:
1. concave mirror 1 laser crystal 3. dichroscope 4. Raman pond 5. concave mirror 2 6. concave mirrors, 3 7.45 degree of scraper mirrors in figure.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
As shown in Figure 1, a kind of Raman laser exporting variable the ratio of obstruction annular beam, comprise concave mirror 1, laser crystal 2, dichroscope 3, Raman pond 4, concave mirror 25 and concave mirror 36, it is characterized in that: concave mirror 1 and concave mirror 25 are oppositely arranged, form a negative branch confocal unstable resonator; From the optical axis of concave mirror 11 to concave mirror 25, laser crystal 2, dichroscope 3 and Raman pond 4 is placed with successively in confocal unstable resonator;
Concave mirror 36 is arranged at outside negative branch confocal unstable resonator, and dichroscope 3 is that miter angle is put with the optical axis of negative branch confocal unstable resonator; Concave mirror 36 and the mirror image of concave mirror 25 in dichroscope 3 form another confocal unstable resonator.
Its concrete operational detail is, laser crystal 2 can be the laser crystal of Nd:YAG or other types, also can be the laser medium of gaseous state.When light source such as use photoflash lamp or laser etc. carrys out pumped laser crvstal 2, laser generation can be produced between concave mirror 1 and concave mirror 25.Confocal unstable resonator oscillation mode is basic mode, good beam quality; And real focus is formed in Raman pond, when not reaching excited Raman threshold value, due to the vibration amplification of pump light, the pumping light power density of the real focus in Raman pond constantly increases, and realizes transforming until reach excited Raman threshold value.The magnification ratio of the confocal unstable resonator at pump light place as far as possible close to 1, should can reduce the geometry loss of confocal unstable resonator like this, improves the power density at focus place, thus improves Raman conversion ratio.Although this geometry loss can be written as 1-1/M
1 2but the active loss in this chamber is much larger than this value, and main cause is that pump light constantly realizes excited Raman and transforms while vibration diffusion, when expanding limit bore, has had the pump light of significant proportion to be converted into Raman light.
Further, containing Raman medium in Raman pond 4, it can be gas, such as hydrogen, deuterium, oxygen, alkane or mist etc.; The wavelength of Raman light and the endovenous laser in pumping Raman pond 4 have different wavelength, by select suitable plated film high thoroughly by the dichroscope 3 pairs of pump lights, to Raman light high reflectance, like this, Raman light forms to bear in branch confocal unstable resonator with dichroscope 3 at concave mirror 36, concave mirror 25 and vibrates; Ensure that pump light overlaps as best one can with the region of Raman light between concave mirror 25 with dichroscope 3 simultaneously.Pump light vibrates between concave mirror 1 and concave mirror 25, and power density improves constantly, when reaching excited Raman threshold value, the excited Raman light produced vibrates in concave mirror 36, the chamber that formed between concave mirror 25 and dichroscope 3, and expand, finally scraped by 45 degree of scraper mirrors 7.The shape of output facula is ring-shaped light spot.
The annular of different the ratio of obstruction external diameter/internal diameter may be needed in the application of reality, by arranging concave mirror 36 flexibly, change its focal length and position, just can change the ratio of obstruction exporting annular laser beams, to facilitate follow-up application.
In order to increase the intensity of optical cavity inside-pumping laser, can use Q-switch, not draw in the accompanying drawings, actual making can be arranged near laser crystal.
The present embodiment is only used to allow those skilled in the art understand the content of this patent more in detail particularly, can not limit the right of this patent with this.
Claims (9)
1. one kind exports the Raman laser of variable the ratio of obstruction annular beam, comprise concave mirror one (1), laser crystal (2), dichroscope (3), Raman pond (4), concave mirror two (5) and concave mirror three (6), it is characterized in that: concave mirror one (1) and concave mirror two (5) are oppositely arranged, form a negative branch confocal unstable resonator; To the optical axis of concave mirror two (5), laser crystal (2), dichroscope (3) and Raman pond (4) is placed with from concave mirror one (1) successively in confocal unstable resonator;
Concave mirror three (6) is arranged at outside negative branch confocal unstable resonator, and dichroscope (3) is that miter angle is put with the optical axis of negative branch confocal unstable resonator; Concave mirror three (6) and the mirror image of concave mirror two (5) in dichroscope (3) form another confocal unstable resonator.
2. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 1, it is characterized in that: between concave mirror three (6) and dichroscope (3), be provided with 45 degree of scraper mirrors (7), the raman laser that confocal unstable resonator produces is exported by 45 degree of scraper mirrors (7).
3. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 1, it is characterized in that, laser crystal (2) is placed between concave mirror one (1) and dichroscope (3), its bore is D, and its distance dichroscope (3) focal length is more farther than dichroscope (3).
4. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 1, it is characterized in that: Raman pond (4) is placed in the real focus of concave mirror two (5) optical axis front.
5. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 1, it is characterized in that: dichroscope (3) is for being that miter angle is placed with optical axis, its effective district optical axis is projected as circle, diameter is identical with concave mirror two (5), and its laser-light transparent that laser crystal (2) is produced, and to the raman laser total reflection that the interior Raman medium of Raman pond (4) produces.
6. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 1, it is characterized in that: the focal length of concave mirror one (1) is longer than concave mirror two (5), its focus also with the overlapping of concave mirror two (5), the magnification ratio of formation is the confocal unstable resonator of M1; And magnification ratio M1 value is between 1.05-1.2.
7. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 1, it is characterized in that: the focal length of concave mirror three (6) is longer than concave mirror one (1), its focus also with the overlapping of concave mirror two (5), forming magnification ratio is the confocal unstable resonator of M2.
8. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 7, it is characterized in that: the light path of 45 degree of described scraper mirror (7) distance focal point is less than the light path of concave mirror two (5) to focus.
9. according to the Raman laser of the variable the ratio of obstruction annular beam of output according to claim 7, it is characterized in that: the clear aperture of 45 degree of described scraper mirrors (7) is (for D) identical with the diameter of laser crystal, the external diameter exporting ring-shaped light spot is D × M2, and hollow parts diameter is D.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363668.2A CN105305222A (en) | 2014-07-28 | 2014-07-28 | Raman laser capable of outputting variable-obscuration-ratio annular beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410363668.2A CN105305222A (en) | 2014-07-28 | 2014-07-28 | Raman laser capable of outputting variable-obscuration-ratio annular beam |
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| CN105305222A true CN105305222A (en) | 2016-02-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880672A (en) * | 2018-09-05 | 2020-03-13 | 中国科学院大连化学物理研究所 | High repetition frequency large energy nanosecond pulse laser and use method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3921096A (en) * | 1974-12-16 | 1975-11-18 | United Technologies Corp | Unstable split mode laser resonator |
| US3969685A (en) * | 1974-12-06 | 1976-07-13 | United Technologies Corporation | Enhanced radiation coupling from unstable laser resonators |
| US4126381A (en) * | 1977-06-24 | 1978-11-21 | The United States Of America As Represented By The Secretary Of The Air Force | Converging wave unstable resonator |
| CN102684052A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Laser unstable resonator capable of outputting solid light beam and application of laser unstable resonator |
| CN103872576A (en) * | 2012-12-10 | 2014-06-18 | 中国科学院大连化学物理研究所 | Gas Raman laser with nearly-concentric stable cavity |
-
2014
- 2014-07-28 CN CN201410363668.2A patent/CN105305222A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3969685A (en) * | 1974-12-06 | 1976-07-13 | United Technologies Corporation | Enhanced radiation coupling from unstable laser resonators |
| US3921096A (en) * | 1974-12-16 | 1975-11-18 | United Technologies Corp | Unstable split mode laser resonator |
| US4126381A (en) * | 1977-06-24 | 1978-11-21 | The United States Of America As Represented By The Secretary Of The Air Force | Converging wave unstable resonator |
| CN102684052A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Laser unstable resonator capable of outputting solid light beam and application of laser unstable resonator |
| CN103872576A (en) * | 2012-12-10 | 2014-06-18 | 中国科学院大连化学物理研究所 | Gas Raman laser with nearly-concentric stable cavity |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880672A (en) * | 2018-09-05 | 2020-03-13 | 中国科学院大连化学物理研究所 | High repetition frequency large energy nanosecond pulse laser and use method thereof |
| CN110880672B (en) * | 2018-09-05 | 2021-02-12 | 中国科学院大连化学物理研究所 | High repetition frequency large energy nanosecond pulse laser and use method thereof |
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