CN104934849A - Confocal unstable resonator Raman laser with seed light - Google Patents
Confocal unstable resonator Raman laser with seed light Download PDFInfo
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- CN104934849A CN104934849A CN201410103060.6A CN201410103060A CN104934849A CN 104934849 A CN104934849 A CN 104934849A CN 201410103060 A CN201410103060 A CN 201410103060A CN 104934849 A CN104934849 A CN 104934849A
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Abstract
The invention discloses a confocal unstable resonator Raman laser with seed light. The confocal unstable resonator Raman laser comprises confocal unstable resonators I and II which share a part of light path on the side of a short-focus reflector, and respectively and correspondingly generate pumped wavelength [lambda]1 oscillation and Raman wavelength[lambda]2 oscillation; and a dichroscope is utilized to realize resonance of pumped light and Raman light in respective optical cavities. The two optical cavities are provided with a common focus. A Raman cell is arranged on the common focus and fully receives the pumped light whose wavelength is [lambda]1 to generate the Raman light whose wavelength is [lambda]2. In addition, the working characteristics of the confocal unstable resonators are simultaneously utilized, a scraper mirror is used to send the seed light into the confocal unstable resonator II corresponding to the Raman light, and a lower excited Raman threshold and higher Raman laser output are realized.
Description
Technical field
The present invention relates to a kind of Raman laser, particularly relate to a kind of confocal unstable resonator Raman laser with seed light.
Background technology
Raman laser is interacted by pump light and the raman gain medium be placed in Raman light optical cavity and produces Raman wavelength laser, this is a kind of nonlinear optical technique, by choosing of various Raman active medium, can be the output that pumping source realizes multiple more long-wave band laser with a certain wavelength laser.
The comparative maturity that current solid dielectric Raman laser has developed, usually have pump light optical cavity to produce pump light, pump light acts on raman gain medium, the starting of oscillation and produce raman laser and export in Raman light optical cavity of the Raman wavelength light of generation.Common Raman laser has the forms such as common optical elements light path and optic fibre light path.
Although solid Roman medium has relatively high gain, because its damage threshold is starkly lower than gas, therefore only have gas just can be applicable to Raman medium that superlaser is the Raman laser of pumping source.If when the La Man Frequency needed in addition moves larger, also gas Raman medium can only be selected.Because density of gas molecules is lower than solid, Raman gain is lower, and the threshold value of Raman light laser is high, and starting of oscillation difficulty, is not easy to realize excited Raman.
Seed light input is that a kind of widely used reduction laser goes out photo threshold, improves the method for laser beam quality, but its application on Raman laser is also fewer.
Summary of the invention
Go out photo threshold in order to what reduce raman laser, improve light optical efficiency, the invention provides a kind of confocal unstable resonator Raman laser with seed light.
The technical solution used in the present invention is a kind of confocal unstable resonator Raman laser with seed light, and it includes two confocal unstable resonators with the light path that partially overlaps, and both focuses overlap, and are respectively used to the starting of oscillation of pump light and Raman light.In order to be separated pump light and Raman light, dichroscope (wave length beam splitting mirror) is used to realize working alone separately of pump light and Raman light.The focus of pump light is positioned at Raman pond inside, effectively can produce Raman light, and forms raman laser vibration.Raman light laser exports eventually through the output coupling mirror with partial reflectance.
Photo threshold is gone out in order to what reduce raman laser, improve energy and the beam quality of raman laser, laser has seed light input system, and Raman wavelength seed light is inputted Raman optical cavity according to swinging to wave mode by the scraper mirror (hollow 45 ° of coupling mirrors) be arranged in Raman light light path by it.
Confocal unstable resonator has magnification ratio M, and for two kinds that walk round about in chamber possible directional light light beams, its result is not identical, and a kind of situation is that beam diameter vibrates at every turn and expands M doubly, and at every turn another kind reduces M doubly; During vibration, collimated light beam and focused beam alternate cycles occur.Utilize this feature, diaphragm can be utilized to carry out oscillation mode in restricted room, the astable pattern of compacting beam expander, only allows the oscillation mode work that light beam reduces.And scraper mirror is part-time as diaphragm and seed light loader.By an annular directional light Raman wavelength λ
2seed light sends into optical cavity light path, brings out λ in Raman light optical cavity
2laser vibrates according to the oscillation mode of seed light, reduces oscillation threshold simultaneously, improves Raman laser power output (namely improving conversion ratio).
A kind of confocal unstable resonator Raman laser with seed light, comprise focal length concave mirror one, focal length concave mirror two, short burnt concave mirror and dichroscope, by the transmittance and reflectance two kinds effect of dichroscope, focal length concave mirror one and focal length concave mirror two all form confocal unstable resonator with short burnt concave mirror, and light path overlaps between dichroscope with short burnt concave mirror;
The straight line main optical path at the axis place of short burnt concave mirror is put dichroscope, scraper mirror, Raman pond and short burnt concave mirror successively;
The transmitted light path of dichroscope away from short burnt concave mirror side is provided with focal length concave mirror two or focal length concave mirror one; Accordingly, on the reflected light path of short burnt concave mirror side, focal length concave mirror one or focal length concave mirror two is provided with at dichroscope;
Light path between focal length concave mirror one and dichroscope is provided with pump light gain media;
Be provided with Raman pond between short burnt concave mirror and dichroscope, two optical windows of Raman pond are respectively towards dichroscope and short burnt concave mirror;
Be provided with scraper mirror between described dichroscope and Raman pond, the side of scraper mirror is provided with seed light input mirror.
Described dichroscope is thoroughly high to the light produced by pump light gain media, high anti-to the light produced through Raman pond; Described short burnt concave mirror and focal length concave mirror one place dichroscope two side respectively, and short burnt concave mirror and focal length concave mirror one are coaxially arranged.
Or described dichroscope is high anti-to the light produced by pump light gain media, thoroughly high to the light produced through Raman pond; Described short burnt concave mirror and focal length concave mirror two place dichroscope two side respectively, and short burnt concave mirror and focal length concave mirror two are coaxially arranged.
The focal length of described focal length concave mirror one, focal length concave mirror two is identical, and is 1.2-1.8 times of short burnt concave mirror focal length.
Described pump light gain media is placed in one to be had in pumping wavelength and the transparent window container of Raman wavelength.
Be parallel to the light of focal length concave mirror one axis photograph to focal length concave mirror one after its reflection, through dichroscope or after dichroic mirror reflects, converge at the first focus; Be parallel to focal length concave mirror two axis according to the light to focal length concave mirror two after its reflection, through dichroic mirror reflects or through after dichroic mirror reflects, converge at the second focus; First focus and the second focus overlap, and are positioned at Raman pond; The focus of short burnt concave mirror overlaps with the first focus and the second focus; Described short burnt concave mirror is all-trans to the light directly produced by pump light gain media, to the light transmission rate produced by Raman pond between 40-50%.
Dichroscope presents contrary transmissivity for the operation wavelength of [pump light gain media] and Raman pond, i.e. a wavelength high-transmission rate, another wavelength high-reflectivity.
Be provided with scraper mirror between described dichroscope and Raman pond, the side of scraper mirror is provided with seed light input mirror; Light is irradiated to the rear flank of scraper mirror near dichroscope through dichroscope or after dichroic mirror reflects through seed light input mirror, and the axis being parallel to focal length concave mirror two shines to focal length concave mirror two.
The axis of described short burnt concave mirror and the dead in line of scraper mirror centre bore, scraper mirror center-hole diameter is not more than the diameter of focal length concave mirror two.
The light of the same frequency that described seed light input mirror pair and pump light gain media produce is high anti-, to saturating with the light height of the same frequency produced through Raman pond.
Methane, ethane is placed with, ethene, hydrogen, oxygen, nitrogen, the mixture of one or more in carbon dioxide in described Raman pond.
Advantage of the present invention injects and the direct axial pumping Raman medium of pump light standing wave owing to have employed seed light, reduces Raman laser and go out photo threshold, improve Raman laser power output.
The invention discloses a kind of confocal unstable resonator Raman laser with seed light input, comprise the confocal unstable resonator one and two of shared short burnt speculum sidepiece path-splitting, correspondence produces pump wavelength respectively
1with Raman wavelength λ
2vibration, adopt dichroscope to realize two pump lights and Raman light at respective optical cavity interior resonance, two optical cavities have public focus, and Raman pond is placed on public focus, and fully accepting wavelength is λ
1pump light to produce wavelength be λ
2raman light; Utilize confocal unstable resonator work characteristics simultaneously, use scraper mirror to send into seed light in confocal unstable resonator two corresponding to Raman light, realizes the raman laser output of lower excited Raman threshold value and Geng Gao.
Accompanying drawing illustrates:
Fig. 1 is one of Raman laser index path, wherein: 1-focal length concave mirror one, 2-pump light gain media, and 3-dichroscope, 4-scraper mirror, 5-Raman pond, the short burnt concave mirror of 6-, 7-focal length concave mirror two, 8-seed light input mirror;
Fig. 2 is Raman laser index path two, wherein: 1-focal length concave mirror one, 2-pump light gain media, and 3-dichroscope, 4-scraper mirror, 5-Raman pond, the short burnt concave mirror of 6-, 7-focal length concave mirror two, 8-seed light input mirror.
Embodiment:
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment one
As shown in Figure 1:
With a confocal unstable resonator Raman laser for seed light, comprise focal length concave mirror 1, focal length concave mirror 27, short burnt concave mirror 6 and dichroscope 3, it is characterized in that:
By the transmittance and reflectance two kinds effect of dichroscope 3, focal length concave mirror 1 and focal length concave mirror 27 all form confocal unstable resonator with short burnt concave mirror 6, and light path overlaps between dichroscope 3 with short burnt concave mirror 6;
The straight line main optical path at the axis place of short burnt concave mirror 6 puts dichroscope 3, scraper mirror 4, Raman pond 5 and short burnt concave mirror 6 successively;
The transmitted light path of dichroscope 3 away from short burnt concave mirror 6 side is provided with focal length concave mirror 27 or focal length concave mirror 1; Accordingly, on the reflected light path of short burnt concave mirror 6 side, focal length concave mirror 1 or focal length concave mirror 27 is provided with at dichroscope 3;
Light path between focal length concave mirror 1 and dichroscope 3 is provided with pump light gain media 2;
Be provided with Raman pond between short burnt concave mirror 6 and dichroscope, two optical windows of Raman pond are respectively towards dichroscope and short burnt concave mirror 6;
Be provided with scraper mirror between described dichroscope and Raman pond, the side of scraper mirror 4 is provided with seed light input mirror 8.
Preferably, defining short burnt concave mirror 6 optical axis is optical axis one, and pump light and Raman light optical cavity magnification ratio are 1.5, dichroscope 3 is place with optical axis one miter angle, and Raman pond 5 is hydrogen pond, and pump light gain media 2 is Nd:YAG crystal, crystal is cylindrical diameter is D, axis of a cylinder coincidence optical axis one.
Further, optical axis one projection aperture of scraper mirror 4 is D/1.5, and placement location is on the focus left side, and distance focal point is no more than the distance of focus and short burnt concave mirror 6, prevents the oscillation light unnecessarily blocked in optical cavity;
Further, the optical cavity one of Nd:YAG is in 1064nm starting of oscillation, and the Raman light frequency 1900nm of hydrogen is in optical cavity two starting of oscillation, and short burnt concave mirror 6 couples of wavelength 1900nm have the coupling output of 30%, and dichroscope 3 pairs of 1064nm high permeabilities, to 1900nm high reflectance.
Further, seed light input mirror 8 pairs of 1064nm high reflectances and to 1900nm high-transmission rate, focal length concave mirror one 1 pairs of 1064nm high reflectances, focal length concave mirror 27 pairs of 1900nm high reflectances, scraper mirror 4 couples of 1064nm, 1900nm are high reflectances.
Specifically, when implementing pumping to pump light gain media 2, then at focal length concave mirror 1,1064nm light starting of oscillation in the confocal unstable resonator one that short burnt concave mirror 6 forms, due to the restriction of scraper mirror 4, the pattern of light beam enlarged-diameter gradually can not work, but reduces M=1.5 pattern starting of oscillation doubly with each oscillation light beam diameter, and at focus place, light intensity is the strongest.1064nm light action, in Raman pond, produces 1900nm Raman light and launches; Due to the existence of dichroscope 3, at focal length concave mirror 1, in the confocal unstable resonator one that short burnt concave mirror 6 forms, 1900nm can not starting of oscillation, then, at focal length concave mirror 27, dichroscope 3, in the folded form confocal unstable resonator that short burnt concave mirror 6 forms, 1900nm starting of oscillation, starting of oscillation pattern is the same, due to the existence of scraper mirror 4, the diminishing oscillation mode of beam diameter is only allowed to occur, and by short burnt concave mirror 6 coupling output 1900nm laser.And when using seed light 1900nm, it is placed on the below of seed light input mirror 8, export the collimated light beam that diameter is not less than D, irradiated to the light path of scraper mirror 4 by seed light input mirror 8, seed light does not stop by scraper mirror 4 after being focused on by focal length concave mirror 27, enter confocal unstable resonator two light path smoothly, short burnt concave mirror 6 is divergently arrived again after Raman pond 5 forms focus, directional light is become after short burnt concave mirror 6 reflects, again left by Raman pond 5, the centre bore of scraper mirror 4, is reflected by dichroscope 3 and arrives focal length concave mirror 27; Which forms the diminishing oscillation mode of the light beam forced in an external world, impel the starting of oscillation of Raman light optical cavity, reduce 1900nm and go out photo threshold, increase Raman laser power output.
Embodiment two
Other change Raman pool gas into methane only with embodiment one, then can realize 1543nm wavelength and export, this wavelength is important communication wavelength, and to the safe wavelength of human eye, marine efficiency of transmission is higher simultaneously.
Embodiment three
When the position in the chamber one/bis-in embodiment one is exchanged, namely pump light gain media 2 is moved between focal length concave mirror 27 and dichroscope 3, select the Transflective wavelength reversion of dichroscope 3 simultaneously, just define embodiment three, pump light optical cavity is refrative cavity, and Raman light optical cavity is line chamber, and such conversion is only conversion geometrically, and not affecting the operation principle of Raman laser, its operation principle is still identical with embodiment one.
Embodiment four
Figure is with embodiment one, short for chamber mirror burnt concave mirror 6 is changed into and all has transmitance to 1064nm and 1900nm, 1064nm, 1900nm of adjustment strength similarity export according to coincidence light path, such twin wavelength laser output has been expected its application, such as can carry out the experiment of hydrogen coherent signal, or the experiment needing dual-wavelength laser of other kinds.
Above-described embodiment is just in order to illustrate technical characterstic of the present invention; object is to allow those skilled in the art easily understand content of the present invention; therefore can not limit scope, the equivalence change that every content of the present invention is made, also drop in protection scope of the present invention.
Claims (10)
1. the confocal unstable resonator Raman laser with seed light, comprises focal length concave mirror one (1), focal length concave mirror two (7), short burnt concave mirror (6) and dichroscope (3), it is characterized in that:
By the transmittance and reflectance two kinds effect of dichroscope (3), focal length concave mirror one (1) and focal length concave mirror two (7) all form confocal unstable resonator with short burnt concave mirror (6), and light path overlaps between dichroscope (3) with short burnt concave mirror (6);
The straight line main optical path at the axis place of short burnt concave mirror (6) puts dichroscope (3), scraper mirror (4), Raman pond (5) and short burnt concave mirror (6) successively;
The transmitted light path of dichroscope (3) away from short burnt concave mirror (6) side is provided with focal length concave mirror two (7) or focal length concave mirror one (1); Accordingly, on the reflected light path of short burnt concave mirror (6) side, focal length concave mirror one (1) or focal length concave mirror two (7) is provided with at dichroscope (3);
Light path between focal length concave mirror one (1) and dichroscope (3) is provided with pump light gain media (2);
Be provided with Raman pond between short burnt concave mirror (6) and dichroscope, two optical windows of Raman pond are respectively towards dichroscope and short burnt concave mirror (6);
Be provided with scraper mirror between described dichroscope and Raman pond, the side of scraper mirror (4) is provided with seed light input mirror (8).
2. the confocal unstable resonator Raman laser of band seed light according to claim 1, is characterized in that:
Described dichroscope is thoroughly high to the light produced by pump light gain media, high anti-to the light produced through Raman pond; Described short burnt concave mirror (6) and focal length concave mirror one (1) place dichroscope two side respectively, and short burnt concave mirror (6) and focal length concave mirror one (1) are coaxially arranged;
Or described dichroscope is high anti-to the light produced by pump light gain media, thoroughly high to the light produced through Raman pond; Described short burnt concave mirror (6) and focal length concave mirror two (7) place dichroscope two side respectively, and short burnt concave mirror (6) and focal length concave mirror two (7) are coaxially arranged.
3. the confocal unstable resonator Raman laser of band seed light according to claim 1, is characterized in that:
The focal length of described focal length concave mirror one (1), focal length concave mirror two (7) is identical, and is 1.2-1.8 times of short burnt concave mirror (6) focal length.
4. the confocal unstable resonator Raman laser of band seed light according to claim 1, is characterized in that:
Described pump light gain media (2) is placed in one to be had in pumping wavelength and the transparent window container of Raman wavelength.
5. the confocal unstable resonator Raman laser of band seed light according to claim 1, is characterized in that:
Be parallel to the light of focal length concave mirror one (1) axis photograph to focal length concave mirror one (1) after its reflection, through dichroscope or after dichroic mirror reflects, converge at the first focus; Be parallel to focal length concave mirror two (7) axis according to the light to focal length concave mirror two (7) after its reflection, through dichroic mirror reflects or through after dichroscope, converge at the second focus; First focus and the second focus overlap, and are positioned at Raman pond; The focus of short burnt concave mirror (6) overlaps with the first focus and the second focus; Described short burnt concave mirror (6) is all-trans to the light directly produced by pump light gain media, to the light transmission rate produced by Raman pond between 40-50%.
6. the confocal unstable resonator Raman laser of band seed light according to claim 1, is characterized in that:
Dichroscope (3) presents contrary transmissivity for the operation wavelength of pump light gain media (2) and Raman pond (5), i.e. a wavelength high-transmission rate, another wavelength high-reflectivity.
7. the confocal unstable resonator Raman laser of band seed light according to claim 1, is characterized in that: be provided with scraper mirror between described dichroscope and Raman pond, and the side of scraper mirror is provided with seed light input mirror; Light is irradiated to the rear flank of scraper mirror near dichroscope through dichroscope or after dichroic mirror reflects through seed light input mirror, and the axis being parallel to focal length concave mirror two (7) shines to focal length concave mirror two (7).
8. the confocal unstable resonator Raman laser of band seed light according to claim 5, is characterized in that: the axis of described short burnt concave mirror (6) and the dead in line of scraper mirror centre bore, scraper mirror center-hole diameter is not more than the diameter of focal length concave mirror two (7).
9. the confocal unstable resonator Raman laser of band seed light according to claim 5, is characterized in that: the light of the same frequency that described seed light input mirror pair and pump light gain media produce is high anti-, to saturating with the light height of the same frequency produced through Raman pond.
10. the confocal unstable resonator Raman laser of band seed light according to claim 1, is characterized in that: be placed with methane, ethane in described Raman pond, ethene, hydrogen, oxygen, nitrogen, the mixture of one or more in carbon dioxide.
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Citations (6)
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| US4144464A (en) * | 1978-01-25 | 1979-03-13 | The United States Of America As Represented By The United States Department Of Energy | Device and method for noresonantly Raman shifting ultraviolet radiation |
| US4327337A (en) * | 1980-01-03 | 1982-04-27 | General Electric Company | Intracavity raman frequency conversion in a high power laser |
| US4933943A (en) * | 1987-10-02 | 1990-06-12 | Hughes Aircraft Company | Intracavity Raman cell resonator |
| US5251221A (en) * | 1992-08-10 | 1993-10-05 | Hughes Aircraft Company | Self aligning intracavity Raman laser |
| DE4311454A1 (en) * | 1993-04-07 | 1994-10-13 | Zeiss Carl Fa | Raman laser |
| US5434882A (en) * | 1994-04-12 | 1995-07-18 | The United States Of America As Represented By The United States Department Of Energy | Injection-controlled laser resonator |
-
2014
- 2014-03-19 CN CN201410103060.6A patent/CN104934849B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4144464A (en) * | 1978-01-25 | 1979-03-13 | The United States Of America As Represented By The United States Department Of Energy | Device and method for noresonantly Raman shifting ultraviolet radiation |
| US4327337A (en) * | 1980-01-03 | 1982-04-27 | General Electric Company | Intracavity raman frequency conversion in a high power laser |
| US4933943A (en) * | 1987-10-02 | 1990-06-12 | Hughes Aircraft Company | Intracavity Raman cell resonator |
| US5251221A (en) * | 1992-08-10 | 1993-10-05 | Hughes Aircraft Company | Self aligning intracavity Raman laser |
| DE4311454A1 (en) * | 1993-04-07 | 1994-10-13 | Zeiss Carl Fa | Raman laser |
| US5434882A (en) * | 1994-04-12 | 1995-07-18 | The United States Of America As Represented By The United States Department Of Energy | Injection-controlled laser resonator |
Non-Patent Citations (2)
| Title |
|---|
| A.J.W. BROWN等: "Injection Seeding of a high-energy photolytically-pumped I* laser", 《PROCEEDINGS OF SPIE》 * |
| 花晓清: "O2、H2、CH4气体的受激拉曼散射", 《中国优秀博硕士学位论文全文数据库（博士）工程科技I辑》 * |
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