CN105742954A - Raman laser for generating rotation Raman light on the basis of gas vibration Raman light pumping - Google Patents
Raman laser for generating rotation Raman light on the basis of gas vibration Raman light pumping Download PDFInfo
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- CN105742954A CN105742954A CN201410765139.5A CN201410765139A CN105742954A CN 105742954 A CN105742954 A CN 105742954A CN 201410765139 A CN201410765139 A CN 201410765139A CN 105742954 A CN105742954 A CN 105742954A
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Abstract
The invention discloses a Raman laser for generating rotation Raman light on the basis of gas vibration Raman light pumping. Through a splitting system, linear polarization pump light output by a pumped laser is tuned to proper energy and is taken as a first beam of linear polarization pump light, and a first Raman pool is introduced for generating mixed light with forward first-order Stokes linear polarization vibration Raman light and residual linear polarization pump light; a residual first beam of pump light is separated from the mixed light through a dichroic mirror, linear polarization vibration Raman light is continuously spread forward and is then converted into circular polarization vibration Raman light through a lambda/4 wave-plate, the circular polarization vibration Raman light is taken as a second beam of circular polarization pump light, and a second first Raman pool is introduced for generating mixed light with forward first-order Stokes circular polarization rotation Raman light and residual circular polarization vibration Raman light; and finally, single circular polarization rotation Roman light is obtained by splitting the light through a light splitting prism group. The Raman laser provided by the invention can obtain a middle-infrared wavelength with a larger frequency shift scope and can be widely applied to such fields as military, medical care, environment monitoring and the like.
Description
Technical field
The present invention relates to Ramar laser, particularly a kind of Ramar laser producing its rotary Raman light based on Gas Vibration Raman optical pump.
Background technology
In recent years, along with laser constantly develops in numerous applications such as traffic, measurement, medical treatment, national defence and industrial or agricultural, develop special optical maser wavelength and increasingly caused the interest of people.These special optical maser wavelengths can be passed through new working-laser material and produce, it is also possible to produced by the conversion of the nonlinear optical frequency such as gas or crystalline material.At non-linear optical field, stimulated Raman scattering can be used for laser emission wavelength is done characteristic frequency conversion (depend on the Raman of Raman medium shake/rotate mould frequency), reaches the output of specific optical maser wavelength.Therefore, stimulated Raman scattering technology is one of important technical realizing wavelength conversion.
Physical form according to Raman medium is different, and Raman medium is commonly divided into solid, liquids and gases.The general volume of solid Roman medium is little, and Raman concentration of medium is high, therefore its Raman gain and conversion ratio are high.Currently having been developed that many kinds of solids Raman medium, application is very extensive, but solid Roman dielectric damages threshold value is low, not easily realizes high energy laser output.Liquid Raman medium is then due to the volatility of liquid medium, and the defect such as toxicity or unstability, range of application is very limited.Comparatively speaking, gas Raman concentration of medium is relatively low, gain is less, but has the advantages such as good heat pipe rationality, higher damage threshold (more likely realizing the output of big energy raman laser), high Raman diaphragm and narrow Raman linewidth, therefore have also been obtained research extensively and profoundly.Conventional gas Raman medium has H2, CH4, O2And N2Deng.
At present, people adopt gas medium to realize the conversion of laser excited Raman and are based primarily upon gas molecule vibrational energy poor (V) and produce its vibrating Raman light, or produce its rotary Raman light based on gas molecule rotational poor (R).But conventional optical maser wavelength is most cannot be realized excited Raman frequency conversion obtained the wavelength that people are very interested, particularly middle infrared wavelength by the single vibration of certain gas or rotational difference.These middle infrared wavelengths are especially comparatively prominent at domain requirements such as medical treatment and national defence.
Summary of the invention
The present invention solves the technical problem existed in above-mentioned background technology, it is proposed that the excited Raman mode that a kind of structure comparison is novel, namely provide a kind of Ramar laser producing its rotary Raman light based on Gas Vibration Raman optical pump.
The technical solution of the present invention is as follows:
A kind of Ramar laser producing its rotary Raman light based on Gas Vibration Raman optical pump, mainly include a pump laser, a set of beam splitting system, first Raman pond, second Raman pond, one dichroic mirror, λ/4 wave plate and one group of Amici prism, it is characterised in that: the linear polarization pump light of pump laser output is by, after beam splitting system tuning energy, exporting the first bunch polarized pump light；First bunch polarized pump light imports first Raman pond and produces the mixed light with forward direction one-level Stokes linear polarization vibrating Raman light and remaining linear polarization pump light；Mixed light isolates remaining linear polarization pump light through dichroic mirror, forward direction one-level Stokes linear polarization vibrating Raman light continues to propagate forward, circular polarization vibrating Raman light is converted to then through λ/4 wave plate, circular polarization vibrating Raman light restraints circular polarization pump light as second, and the second bundle circular polarization pump light imports second Raman pond again and produces the mixed light with forward direction one-level Stokes circular polarization rotary Raman light and remaining circular polarization vibrating Raman light；Finally this mixed light obtains single circular polarization rotary Raman light by Amici prism component light.
Wherein, pass sequentially through the first high reflective mirror, the second high reflective mirror and the first condenser lens from the first bunch polarized pump light of beam splitting system output and focus on first Raman pond of importing, produce the mixed light with forward direction one-level Stokes linear polarization vibrating Raman light and remaining linear polarization pump light therewith, after this mixed light sequentially passes through the second condenser lens and dichroic mirror, remaining pump light P separates from the vertical light direction of propagation and imports BeamDump dissipation；And linear polarization vibrating Raman light continues to be propagated through forward λ/4 wave plate, be converted to circular polarization vibrating Raman light, circular polarization pump light is restrainted as second, import second Raman pond by tertiary focusing lens focus, produce the mixed light with forward direction one-level Stokes circular polarization rotary Raman light and remaining circular polarization vibrating Raman light therewith；Finally, mixed light priority, by the 4th condenser lens collimation and Amici prism group, is restrainted pump light and circular polarization rotary Raman light remaining second and is separated, thus obtaining single circular polarization rotary Raman light.
Wherein, described Amici prism group is to be made up of two prisms set gradually in light path.
Wherein, it is incidence window on the right side of first described Raman pond, left side is exit window, two windows respectively the first quartz window sheet and the second quartz window sheet, the first bunch polarized pump light after the first condenser lens and the forward direction one-level Stokes linear polarization vibrating Raman light produced therewith all first pass through first Raman pond incidence window and go out again through exit window transmission.
Wherein, it is incidence window on the right side of second described Raman pond, left side is exit window, two windows are the 3rd quartz window sheet and the 4th quartz window sheet respectively, and the second bundle circular polarization pump light and the forward direction one-level Stokes circular polarization rotary Raman light that produces therewith after tertiary focusing lens all first pass through second Raman pond incidence window and goes out again through exit window transmission.
Wherein, described beam splitting system is made up of 1 λ/2 wave plate, 1 beam-dividing cube, 1 energy BeamDump and 1 pump light high reflective mirror；Namely, λ/2 wave plate is first passed through from the linear polarization pump light of pump laser output, S and P polarization light light intensity is changed continuously by regulating the angle of λ/2 wave plate optical axis, it is split then through beam-dividing cube, the light beam of lower section transmission is then through output after pump light high reflective mirror as being the first bundle pump light, and the light beam of horizontal transmission enters BeamDump and dissipates.
Wherein, the first described condenser lens and the focus of the second condenser lens are positioned at first Raman pond center；The focus of tertiary focusing lens and the 4th condenser lens is positioned at second Raman pond center.
Wherein, the first described high reflective mirror and the second high reflective mirror are that the first bunch polarized pump light is high anti-；Two-phase color mirror is linear polarization vibrating Raman light is high saturating and the first bunch polarized pump light is high anti-；The wavelength that λ/4 wave plate is corresponding is linear polarization vibrating Raman optical wavelength.
Producing its vibrating Raman light with traditional based on gas molecule vibrational energy poor (V), or produce its rotary Raman light based on gas molecule rotational poor (R) and carry out excited Raman frequency shift, the Ramar laser of the present invention has the following advantages:
1), due to second restrainting pump light and derive from the vibrating Raman light of first Raman pond, excited Raman frequency shift again, then from energy point of view, the scope of whole process frequency displacement becomes much larger；
2), some conventional optical maser wavelength cannot pass through the single vibration of certain gas or rotational difference realizes excited Raman frequency conversion and obtains the optical maser wavelength that people are interested, and this technology provides possibility for realizing some specific middle infrared wavelength by stimulated Raman scattering.
Accompanying drawing explanation
Fig. 1 is that the present invention produces the Raman laser structure schematic diagram of its rotary Raman light based on Gas Vibration Raman optical pump.
Wherein 1-pump laser, 2-beam splitting system, 3-the first high reflective mirror, 4-the second high reflective mirror, 5-the first condenser lens, 6-the first quartz window sheet, 7,17-charging valve, first Raman pond of 8-, 9,19-air gauge, 10-the second quartz window sheet, 11-the second condenser lens, 12-dichroic mirror, 13-energy refuse receptacle, 14-λ/4 wave plate, 15-tertiary focusing lens, 16-the 3rd quartz window sheet, second Raman pond of 18-, 20-the 4th quartz window sheet, 21-the 4th condenser lens, 22-Amici prism group.
Fig. 2 is based on H2Gas Vibration Raman light 683nm pumping produces the Ramar laser output light spectrogram of its rotary Raman light 712nm.
Detailed description of the invention
Refer to shown in accompanying drawing 1.nullAs seen from the figure，The present invention produces the Ramar laser of its rotary Raman light based on Gas Vibration Raman optical pump，Including: a pump laser 1，The beam splitting system 2 of a set of tunable pump energy，First Raman pond 8 and both ends of the surface flange thereof are respectively put the first quartz window sheet 6 of diameter 30mm、Second quartz window sheet 10，It is arranged on the charging valve 7 on first Raman pond 8 and air gauge 9，Place the first Raman pond two ends the first condenser lens 5 and the second condenser lens 11 for focusing on,One vibrating Raman light is high saturating and the first bundle pump light height is anti-dichroic mirror 12，One energy refuse receptacle 13 receiving residue the first bundle pump light，One λ/4 wave plate 14 corresponding to linear polarization vibrating Raman optical wavelength，Second Raman pond 18 and both ends of the surface flange thereof are respectively put the 3rd quartz window sheet 16 of diameter 30mm、4th quartz window sheet 20，It is arranged on the charging valve 17 on second Raman pond 18 and air gauge 19，Place the second Raman pond two ends for the tertiary focusing lens 15 focused on and the 4th condenser lens 21，With one group of Amici prism 22.Wherein, the main body of first Raman pond 8 and second Raman pond 18 is all the stainless steel tube of internal diameter 26 millimeters, wall thickness 3 millimeters, length respectively 1800 millimeters and 300 millimeters.
Specifically, the pump light of pump laser 1 output is tuned to suitable energy by beam splitting system 2, as the first bunch polarized pump light, after being focused on by the first high reflective mirror 3 (R > 99.5%), the second high reflective mirror 4 (R > 99.5%) reflection and the first condenser lens 5 (focal length is 1000 millimeters), the right side incidence window through first Raman pond 8 imports in this Raman pond, produces forward direction one-level Stokes linear polarization vibrating Raman light therewith.Mixed light, after the second condenser lens 11 (focal length is 1000 millimeters) and dichroic mirror 12 (linear polarization vibrating Raman light is high saturating and the first bunch polarized pump light is high anti-), is isolated remaining first bundle pump light and is imported energy refuse receptacle 13 in vertical transmission direction；And linear polarization vibrating Raman light transmission dichroic mirror 12 continues to propagate forward, be converted to circular polarization vibrating Raman light then through λ/4 wave plate 14, and restraint circular polarization pump light as second.Second bundle circular polarization pump light imports second Raman pond 18 again through tertiary focusing lens 15 (focal length is 200 millimeters), produces forward direction one-level Stokes circular polarization rotary Raman light therewith；Single circular polarization rotary Raman light is obtained finally by the 4th condenser lens 21 (focal length is 200 millimeters) and Amici prism group 22 light splitting.
The embodiment of the present invention, adopts U.S. ContinuumNd:YAG laser-doubled light 532nm as pump light, with high-purity H2For stimulated Raman scattering medium, it is achieved the generation of its forward direction single order Stokes 683nm vibrating Raman light also produces 712nm rotary Raman light for the second bundle pump light again through excited Raman process with it.First Raman pond 8 injects 4.0MPa hydrogen, and second Raman pond 18 injects 2.0MPa hydrogen.Carry out based on H according to above-mentioned experimental procedure2Gas Vibration Raman light 683nm pumping produces the Ramar laser of its rotary Raman light 712nm and goes out light experiment.
In experimentation, Horiba spectrogrph (HR320) is for detecting Amici prism laser species out.Fig. 2 gives each raman laser output wavelength that spectrometer detection arrives.Test result indicate that: based on H2Gas Vibration Raman light 683nm (linear polarization) pumping achieves the generation of its rotary Raman light 712nm (circular polarization) preferably, namely further illustrates by using this converter technique, it is possible to achieve the cascade frequency conversion of certain optical maser wavelength.It addition, the anti-Stokes Raman light that other several signal peaks are hydrogen that Fig. 2 provides, do not affect the above-mentioned results verification to Stokes vibrating Raman light and rotary Raman light and analysis.
Claims (8)
1. the Ramar laser of its rotary Raman light is produced based on Gas Vibration Raman optical pump, including a pump laser (1), a set of beam splitting system (2), first Raman pond (8), second Raman pond (18), one dichroic mirror (12), λ/4 wave plate (14) and one group of Amici prism (22), it is characterised in that:
The linear polarization pump light that pump laser (1) exports is by, after beam splitting system (2) tuning energy, exporting the first bunch polarized pump light；First bunch polarized pump light imports first Raman pond (8) and produces the mixed light with forward direction one-level Stokes linear polarization vibrating Raman light and remaining linear polarization pump light；
Mixed light isolates remaining linear polarization pump light through dichroic mirror (12), forward direction one-level Stokes linear polarization vibrating Raman light continues to propagate forward, circular polarization vibrating Raman light is converted to then through λ/4 wave plate (14), circular polarization vibrating Raman light restraints circular polarization pump light as second, and the second bundle circular polarization pump light imports second Raman pond (18) again and produces the mixed light with forward direction one-level Stokes circular polarization rotary Raman light and remaining circular polarization vibrating Raman light；
Finally, mixed light obtains single circular polarization rotary Raman light by Amici prism group (22) light splitting.
2. Ramar laser according to claim 1, it is characterised in that:
The the first bunch polarized pump light exported from beam splitting system (2) passes sequentially through the first high reflective mirror (3), the second high reflective mirror (4) and the first condenser lens (5) focusing first Raman pond (8) of importing, produce the mixed light with forward direction one-level Stokes linear polarization vibrating Raman light and remaining linear polarization pump light therewith, after this mixed light sequentially passes through the second condenser lens (11) and dichroic mirror (12), remaining pump light P separates from the vertical light direction of propagation and imports BeamDump (13) dissipation；And linear polarization vibrating Raman light continues to be propagated through forward λ/4 wave plate (14), be converted to circular polarization vibrating Raman light, circular polarization pump light is restrainted as second, focused on by tertiary focusing lens (15) and import second Raman pond (18), produce the mixed light with forward direction one-level Stokes circular polarization rotary Raman light and remaining circular polarization vibrating Raman light therewith；Finally, mixed light priority, by the 4th condenser lens (21) collimation and Amici prism group (22), is restrainted pump light and circular polarization rotary Raman light remaining second and is separated, thus obtaining single circular polarization rotary Raman light.
3. Ramar laser according to claim 1, it is characterised in that:
Amici prism group (22) is to be made up of two prisms set gradually in light path.
4. Ramar laser according to claim 1, it is characterised in that:
First described Raman pond (8) right side is incidence window, left side is exit window, two windows respectively the first quartz window sheet (6) and the second quartz window sheet (10), the first bunch polarized pump light after the first condenser lens (5) and the forward direction one-level Stokes linear polarization vibrating Raman light produced therewith all first pass through first Raman pond incidence window and go out again through exit window transmission.
5. Ramar laser according to claim 1, it is characterised in that:
Second described Raman pond (18) right side is incidence window, left side is exit window, two windows are the 3rd quartz window sheet (16) and the 4th quartz window sheet (20) respectively, and the second bunch polarized pump light after tertiary focusing lens (15) and the forward direction one-level stockes line polarization produced therewith rotate Raman light and all first pass through second Raman pond incidence window and go out again through exit window transmission.
6. Ramar laser according to claim 1 and 2, it is characterised in that:
Described beam splitting system (2) is made up of 1 λ/2 wave plate, 1 beam-dividing cube, 1 energy BeamDump and 1 pump light high reflective mirror；Namely, the linear polarization pump light exported from pump laser (1) first passes through λ/2 wave plate, S and P polarization light light intensity is changed continuously by regulating the angle of λ/2 wave plate optical axis, it is split then through beam-dividing cube, the light beam of lower section transmission is then through output after pump light high reflective mirror as being the first bundle pump light, and the light beam of horizontal transmission enters BeamDump and dissipates.
7. the Ramar laser according to claim 1,2,4 or 5, it is characterised in that:
Described the first condenser lens (5) and the focus of the second condenser lens (11) are positioned at first Raman pond (8) center；The focus of tertiary focusing lens (15) and the 4th condenser lens (21) is positioned at second Raman pond (18) center.
8. Ramar laser according to claim 1 and 2, it is characterised in that:
Described the first high reflective mirror (3) and the second high reflective mirror (4) are that the first bunch polarized pump light is high anti-；Two-phase color mirror (12) is linear polarization vibrating Raman light is high saturating and the first bunch polarized pump light is high anti-；The wavelength that λ/4 wave plate (14) is corresponding is linear polarization vibrating Raman optical wavelength.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106290299A (en) * | 2016-08-04 | 2017-01-04 | 北京华泰诺安探测技术有限公司 | A kind of polarization diversity polarization Raman probe and optical spectrum detecting method |
| CN112186494A (en) * | 2019-07-04 | 2021-01-05 | 中国科学院大连化学物理研究所 | CO (carbon monoxide)2Cascade ultraviolet Raman laser |
| CN114256729A (en) * | 2020-09-22 | 2022-03-29 | 中国科学院大连化学物理研究所 | Intermediate infrared Raman laser with narrow pulse width, high peak power and high average power |
| CN114552346A (en) * | 2020-11-27 | 2022-05-27 | 中国科学院大连化学物理研究所 | Narrow linewidth wavelength continuously tunable laser device and method for outputting 732nm laser |
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| CN106290299A (en) * | 2016-08-04 | 2017-01-04 | 北京华泰诺安探测技术有限公司 | A kind of polarization diversity polarization Raman probe and optical spectrum detecting method |
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| CN114256729A (en) * | 2020-09-22 | 2022-03-29 | 中国科学院大连化学物理研究所 | Intermediate infrared Raman laser with narrow pulse width, high peak power and high average power |
| CN114256729B (en) * | 2020-09-22 | 2024-04-09 | 中国科学院大连化学物理研究所 | Mid-infrared Raman laser with narrow pulse width, high peak power and high average power |
| CN114552346A (en) * | 2020-11-27 | 2022-05-27 | 中国科学院大连化学物理研究所 | Narrow linewidth wavelength continuously tunable laser device and method for outputting 732nm laser |
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