CN100350325C - Device for preventing pollution generated on window of Raman tube with methane being filled in from laser - Google Patents
Device for preventing pollution generated on window of Raman tube with methane being filled in from laser Download PDFInfo
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- CN100350325C CN100350325C CNB2004100149084A CN200410014908A CN100350325C CN 100350325 C CN100350325 C CN 100350325C CN B2004100149084 A CNB2004100149084 A CN B2004100149084A CN 200410014908 A CN200410014908 A CN 200410014908A CN 100350325 C CN100350325 C CN 100350325C
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Abstract
The present invention discloses a device for preventing laser from generating pollution on a window of a Raman tube filled with methane. The device comprises a laser (1), a focusing lens (2) and the Raman tube (3) filled with methane, wherein the focusing lens (2) and the Raman tube (3) are orderly arranged on an output light path of the laser (1). Particularly, the mixture gas of helium, neon, hydrogen, nitrogen, argon and deuterium is also filled in the Raman tube (3). When the air pressure of the mixture gas is from 1 to 5MPa, the mixture gas has the component proportion: 1 portion of methane, 0.4 to 0.6 portion of helium, 0.2 to 0.4 portion of neon, 0.2 to 0.4 portion of hydrogen, 0.9 to 1.1 portion of nitrogen, 0.7 to 0.9 portion of argon and 0.05 to 0.15 portion of deuterium. When the air pressure of the portion gas is 3MPa, the ratio of methane to helium to neon to hydrogen to nitrogen to argon to deuterium is 1: 0.5: 0.3: 0.3: 1: 0.8: 0.1. The focal length of the focusing lens (2) is from 50 to 100cm. The present invention can make the window of the Raman tube still keep the original state after the Raman tube is respectively continuously irradiated for eight hours in single time by laser which continuously outputs, and the repetition rate of the laser is from 10 to 50Hz; the output wavelength is 266 nm, and the energy is from 20 to 70mJ. The device can be used for realizing the scattering effect of stimulated Raman tubes.
Description
Technical field the present invention relates to a kind of preventing and produces the device that pollutes at the Raman window of tube, prevents that especially laser is being filled with the device that produces pollution on the Raman window of tube of methane.
Background technology laser is owing to its intensity height, directivity and the good advantage of monochromaticity have been subjected to using widely.; the wavelength of the active medium output in the laser instrument is limited; people are in order to address this problem; often utilize the stimulated Raman scattering effect to produce to have this Tekes light and anti-this Tekes light with the laser similarity; to obtain the more LASER Light Source of multi-wavelength, be used to satisfy the demand of different occasions.Be generally laser instrument, be arranged at the condenser lens on this laser instrument output light path and be filled with the Raman pipe of methane gas as the stimulated Raman scattering means for influencing of active medium with methane gas.During use, after the laser line focus lens focus of laser instrument output, the methane gas in the irradiation Raman pipe can produce anti-this Tekes light of this Tekes light of single order, this Tekes light of second order, this Tekes light of three rank and single order etc. by the Raman pipe.But, ionization, puncture and disassociation can take place in the methane gas in this device Yin Laman pipe under high-intensity laser radiation, thereby generation carbon radicals, the carbon radicals that produces can stick on the window material of Raman pipe and form smudging, light then influence the energy conversion efficiency of stimulated Raman scattering, heavy then make the stimulated Raman scattering effect be difficult to produce.Though there is employing in the Raman pipe, to add the generation that hydrogen suppresses carbon, as a kind of " the improving the laser system of gas Raman scattering pipe " disclosed in June in 1988 laid-open U.S. Patents application specification on the 14th US4751714A, the hydrogen that adds but it still has is few, then can not avoid the generation of carbon in the pipe fully, hydrogen adds too much, then can influence, disturb the defective of the Ramam effect of methane again; Also have and in the Raman pipe, to add alkaline metal and earth alkali metal, to suppress the generation of carbon radicals, as a kind of " method and apparatus of purified gases " once described among the disclosed patent application specification WO9743808A of World Intellectual Property Organization on November 20th, 1997, but there is also complex structure, bulky and awkward deficiency.
The summary of the invention the technical problem to be solved in the present invention is the limitation that overcomes above-mentioned various schemes, provides a kind of laser that prevents simple in structure, easy to use being filled with the device that produces pollution on the Raman window of tube of methane.
The technical scheme that is adopted comprises the condenser lens that is equipped with successively on laser instrument and the output light path thereof and is filled with the Raman pipe of methane, also be filled with the mixed gas of helium, neon, hydrogen, nitrogen, argon gas and deuterium gas in the particularly said Raman pipe, the air pressure of said mixed gas is that 1～5 MPa, composition are methane: helium: neon: hydrogen: nitrogen: argon gas: deuterium gas is 1: 0.4～0.6: 0.2～0.4: 0.2～0.4: 0.9～1.1: 0.7～0.9: 0.0 5～0.1 5, and the focal length of said condenser lens is 50～100cm.
As the further improvement of technical scheme, the air pressure of described mixed gas is 3 MPas; Described methane: helium: neon: hydrogen: nitrogen: argon gas: deuterium gas is 1: 0.5: 0.3: 0.3: 1: 0.8: 0.1; Described laser instrument is the Nd:YAG laser instrument of 20～70mJ for output 266nm wavelength, pulse energy; The focal length of described condenser lens is 70cm.
Beneficial effect with respect to prior art is, one, sneak into the bigger helium of coefficient of heat conductivity at the former Raman Guan Zhongzai that is filled with methane gas, neon, hydrogen, nitrogen, argon gas and deuterium gas, it is little because of its coefficient of heat conductivity to have solved methane gas, under the irradiation of the higher pulse laser of repetition frequency, the heat that absorbs in the methane gas is difficult to immediately distribute, quickened the disassociation of methane molecule, particularly near focus, cause the Rapid Thermal disassociation of methane owing to temperature is too high, thereby produce a large amount of carbon radicals, and then the difficult problem of the window of pollution Raman pipe, through repeatedly test, adopting repetition rate during test respectively is 10～50Hz or output continuously, output wavelength is 266nm, energy is the laser single Continuous irradiation 8 hours of 20～70mJ, and the window at Raman pipe two ends remains as clean as a penny; They are two years old, blending ratio between methane gas and helium, neon, hydrogen, nitrogen, argon gas and deuterium gas, and the selection of the air pressure of mixed gas, make the heat-conducting gas of sneaking into both not disturb methane gas to produce this Tekes light, under equal conditions do not reduce the power output of Raman pipe again; They are three years old, the focal length of condenser lens is chosen to be 50～100cm, methane gas in having guaranteed the Raman pipe has the conversion efficiency of this suitable Tekes light after by laser radiation, and also can make the threshold value that is ionized and punctures of methane gas be higher than the irradiation light intensity of laser simultaneously; Its four, at the laser beam of specific 266nm wavelength, the focal length of selected condenser lens is 70cm, and the overall efficiency of the device of the laser instrument that adopts the output specific wavelength is reached to the best.
Description of drawings is described in further detail optimal way of the present invention below in conjunction with accompanying drawing.
Fig. 1 is a kind of basic structure synoptic diagram of the present invention.
Embodiment embodiment 1: referring to Fig. 1, laser instrument 1 is the Nd:YAG laser instrument of 20mJ for output wavelength 266nm, pulse energy.On the output light path of laser instrument 1, be disposed with condenser lens 2 and Raman pipe 3; Wherein, the focal length of condenser lens 2 is 50cm; Be filled with the mixed gas that air pressure is 1 MPa in the Raman pipe 3, this mixed gas is made of methane, helium, neon, hydrogen, nitrogen, argon gas and deuterium gas, and its mutual ratio is a methane: helium: neon: hydrogen: nitrogen: argon gas: deuterium gas is 1: 0.4: 0.2: 0.2: 0.9: 0.7: 0.05.
Embodiment 2: referring to Fig. 1, laser instrument 1 is the Nd:YAG laser instrument of 50mJ for output wavelength 266nm, pulse energy.On the output light path of laser instrument 1, be disposed with condenser lens 2 and Raman pipe 3; Wherein, the focal length of condenser lens 2 is 70cm; Be filled with the mixed gas that air pressure is 3 MPas in the Raman pipe 3, this mixed gas is made of methane, helium, neon, hydrogen, nitrogen, argon gas and deuterium gas, and its mutual ratio is a methane: helium: neon: hydrogen: nitrogen: argon gas: deuterium gas is 1: 0.5: 0.3: 0.3: 1: 0.8: 0.1.
Embodiment 3: referring to Fig. 1, laser instrument 1 is the Nd:YAG laser instrument of 70mJ for output wavelength 266nm, pulse energy.On the output light path of laser instrument 1, be disposed with condenser lens 2 and Raman pipe 3; Wherein, the focal length of condenser lens 2 is 100cm; Be filled with the mixed gas that air pressure is 5 MPas in the Raman pipe 3, this mixed gas is made of methane, helium, neon, hydrogen, nitrogen, argon gas and deuterium gas, and its mutual ratio is a methane: helium: neon: hydrogen: nitrogen: argon gas: deuterium gas is 1: 0.6: 0.4: 0.4: 1.1: 0.9: 0.15.
During use, selecting repetition rate respectively for use is the laser of Nd:YAG laser instrument (also can be the laser instrument 1 of continuous output) the output 266nm wavelength of 10Hz or 20Hz or 30Hz or 40Hz or 50Hz, after line focus lens 2 focus on, methane gas in the irradiation Raman pipe 3, all can produce wavelength and be the outputs such as anti-this Tekes light of single order that this Tekes light of single order of 288.4nm, this Tekes light of second order that wavelength is 314.9nm, this Tekes light of three rank that wavelength is 346.7nm and wavelength are 246.8nm, for follow-up usefulness.
Obviously, those skilled in the art can produce the device that pollutes and carries out various changes and modification and do not break away from the spirit and scope of the present invention being filled with on the Raman window of tube of methane the laser that prevents of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (5)
1, a kind of laser that prevents is being filled with the device that produces pollution on the Raman window of tube of methane, comprise condenser lens (2) that is equipped with successively on laser instrument (1) and the output light path thereof and the Raman pipe (3) that is filled with methane, it is characterized in that also being filled with helium in the said Raman pipe (3), neon, hydrogen, nitrogen, the mixed gas of argon gas and deuterium gas, the air pressure of said mixed gas is 1～5 MPa, composition is a methane: helium: neon: hydrogen: nitrogen: argon gas: deuterium gas is 1: 0.4～0.6: 0.2～0.4: 0.2～0.4: 0.9～1.1: 0.7～0.9: 0.05～0.15, and the focal length of said condenser lens (2) is 50～100cm.
2, the laser that prevents according to claim 1 is being filled with the device that produces pollution on the Raman window of tube of methane, and the air pressure that it is characterized in that mixed gas is 3 MPas.
3, the laser that prevents according to claim 1 is being filled with the device that produces pollution on the Raman window of tube of methane, and it is characterized in that methane: helium: neon: hydrogen: nitrogen: argon gas: deuterium gas is 1: 0.5: 0.3: 0.3: 1: 0.8: 0.1.
4, the laser that prevents according to claim 1 is being filled with the device that produces pollution on the Raman window of tube of methane, it is characterized in that laser instrument (1) is the Nd:YAG laser instrument of 20～70mJ for output 266nm wavelength, pulse energy.
5, the laser that prevents according to claim 4 is being filled with the device that produces pollution on the Raman window of tube of methane, and the focal length that it is characterized in that condenser lens (2) is 70cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100149084A CN100350325C (en) | 2004-05-14 | 2004-05-14 | Device for preventing pollution generated on window of Raman tube with methane being filled in from laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100149084A CN100350325C (en) | 2004-05-14 | 2004-05-14 | Device for preventing pollution generated on window of Raman tube with methane being filled in from laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1696808A CN1696808A (en) | 2005-11-16 |
| CN100350325C true CN100350325C (en) | 2007-11-21 |
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| CNB2004100149084A Expired - Fee Related CN100350325C (en) | 2004-05-14 | 2004-05-14 | Device for preventing pollution generated on window of Raman tube with methane being filled in from laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103185712A (en) * | 2011-12-30 | 2013-07-03 | 中国科学院安徽光学精密机械研究所 | Device for generating multi-wavelength stimulated raman laser |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4751714A (en) * | 1987-01-12 | 1988-06-14 | General Electric Company | Laser system with improved gaseous raman scattering cell |
| CN87214068U (en) * | 1987-10-10 | 1988-09-07 | 清华大学 | Miniature internal chamber raman frequency-shift laser |
| US5216535A (en) * | 1991-06-17 | 1993-06-01 | Fellows William G | Optical deflection device |
| WO1997043808A1 (en) * | 1996-05-15 | 1997-11-20 | Saab Dynamics Aktiebolag | A method and device for purifying gas |
| CN1476131A (en) * | 2003-06-27 | 2004-02-18 | 中国科学院上海光学精密机械研究所 | Multi-wavelength solid harmonic Raman laser |
| JP2004126441A (en) * | 2002-10-07 | 2004-04-22 | Fuji Photo Film Co Ltd | Non-resonance two-photon absorption compound, non-resonance two-photon emission compound, and non-resonance two-photon absorption induction method and light emission generating method by non-resonance two photon absorption |
-
2004
- 2004-05-14 CN CNB2004100149084A patent/CN100350325C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4751714A (en) * | 1987-01-12 | 1988-06-14 | General Electric Company | Laser system with improved gaseous raman scattering cell |
| CN87214068U (en) * | 1987-10-10 | 1988-09-07 | 清华大学 | Miniature internal chamber raman frequency-shift laser |
| US5216535A (en) * | 1991-06-17 | 1993-06-01 | Fellows William G | Optical deflection device |
| WO1997043808A1 (en) * | 1996-05-15 | 1997-11-20 | Saab Dynamics Aktiebolag | A method and device for purifying gas |
| JP2004126441A (en) * | 2002-10-07 | 2004-04-22 | Fuji Photo Film Co Ltd | Non-resonance two-photon absorption compound, non-resonance two-photon emission compound, and non-resonance two-photon absorption induction method and light emission generating method by non-resonance two photon absorption |
| CN1476131A (en) * | 2003-06-27 | 2004-02-18 | 中国科学院上海光学精密机械研究所 | Multi-wavelength solid harmonic Raman laser |
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| CN1696808A (en) | 2005-11-16 |
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