Title:
LIGHT SOURCE DEVICE FOR USE IN DETECTING GAS
Document Type and Number:
WIPO Patent Application WO/2000/072086
Kind Code:
A1
Abstract:
A light source device equipped with an oscillator (wavelength converting means) (2) which receives a pump light (L1) from a pump light source unit (1) and generates a signal light and an idler light by the optical parametric oscillation (oscillation according to pseudo phase matching method), characterized in that the oscillator has a LiNbO¿3? crystal doped with MgO (3) as the wavelength converting crystal thereof. The LiNbO¿3? crystal doped with MgO (3) has a periodic polarization reversion structure for pseudo phase matching whose polarization reversion period is such that renders possible to generate a light having an absorption wavelength of the gas to be detected at a crystal temperature lower than 100 °C. The above polarization reversion period is significantly different from conventional polarization reversion periods of a LiNbO¿3? crystal known for various gases. The light source device for use in detecting a gas requires no large sized heating apparatus for preventing the optical damage of a wavelenght conversion crystal and thus is compact, and also is excellent in explosion protection.
Inventors:
NAKAMURA MASARU (JP)
TSUNEKAWA TAKASHI (JP)
TANIGUCHI KOICHI (JP)
TADATOMO KAZUYUKI (JP)
TSUNEKAWA TAKASHI (JP)
TANIGUCHI KOICHI (JP)
TADATOMO KAZUYUKI (JP)
Application Number:
PCT/JP2000/003278
Publication Date:
November 30, 2000
Filing Date:
May 22, 2000
Export Citation:
Assignee:
MITSUBISHI CABLE IND LTD (JP)
NAKAMURA MASARU (JP)
TSUNEKAWA TAKASHI (JP)
TANIGUCHI KOICHI (JP)
TADATOMO KAZUYUKI (JP)
NAKAMURA MASARU (JP)
TSUNEKAWA TAKASHI (JP)
TANIGUCHI KOICHI (JP)
TADATOMO KAZUYUKI (JP)
International Classes:
G01N21/01; G01N21/35; G01N21/3504; G02F1/39; G02F1/35; (IPC1-7): G02F1/39; G01N21/01; G01N21/35
Foreign References:
| GB1431269A | 1976-04-07 |
Other References:
F.Q.COLVILLE AND B.T.MCGUCKIN: "OPOs tune solid-state CW Lasers from 3 to 5 microns", LASER FOCUS WORLD, vol. 34, no. 11, November 1998 (1998-11-01), pages 83-84 - 86-87, XP002929648
YANG,S.T. AND VELSKO,S.P.: "Frequency-agile kilohertz repetition-rate optical parametric oscillator based on periodically poled lithium niobate", OPTICS LETTERS, vol. 24, no. 3, February 1999 (1999-02-01), CALIFORNIA, pages 133 - 135, XP002929649
MYERS,L.E.: "Quasi-phase-matched optical parametric oscillators in bulk periodically poled LiNbO3", J. OPT. SOC. AM. B, vol. 12, no. 11, November 1995 (1995-11-01), pages 2102 - 2116, XP002929650
MURRAY,S.C. ET AL: "Optical Sensors Improve Leak Detection and location", INTERNATIONAL GAS RESEARCH CONFERENCE 1995, vol. 1, February 1996 (1996-02-01), pages 1048 - 1057, XP002929651
NAKAMURA,M. ET AL: "Quasi-Phase-Matched Optical Parametric Oscillator Using Periodically Poled MgO-Doped LiNbO3 Crystal", JAPANESE JOURNAL OF APPLIED PHYSICS,PART 2, vol. 38, no. 11A, December 1997 (1997-12-01), pages L1234 - L1236, XP002929652
ZELMON,D.E.: "Infrared corrected Sellmeier coefficients for congruently grown Lithium niobate and 5 mol.% magnesium oxide-doped Lithium niobate", JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, vol. 14, no. 12, December 1997 (1997-12-01), pages 3319 - 3322, XP002929653
YANG,S.T. AND VELSKO,S.P.: "Frequency-agile kilohertz repetition-rate optical parametric oscillator based on periodically poled lithium niobate", OPTICS LETTERS, vol. 24, no. 3, February 1999 (1999-02-01), CALIFORNIA, pages 133 - 135, XP002929649
MYERS,L.E.: "Quasi-phase-matched optical parametric oscillators in bulk periodically poled LiNbO3", J. OPT. SOC. AM. B, vol. 12, no. 11, November 1995 (1995-11-01), pages 2102 - 2116, XP002929650
MURRAY,S.C. ET AL: "Optical Sensors Improve Leak Detection and location", INTERNATIONAL GAS RESEARCH CONFERENCE 1995, vol. 1, February 1996 (1996-02-01), pages 1048 - 1057, XP002929651
NAKAMURA,M. ET AL: "Quasi-Phase-Matched Optical Parametric Oscillator Using Periodically Poled MgO-Doped LiNbO3 Crystal", JAPANESE JOURNAL OF APPLIED PHYSICS,PART 2, vol. 38, no. 11A, December 1997 (1997-12-01), pages L1234 - L1236, XP002929652
ZELMON,D.E.: "Infrared corrected Sellmeier coefficients for congruently grown Lithium niobate and 5 mol.% magnesium oxide-doped Lithium niobate", JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, vol. 14, no. 12, December 1997 (1997-12-01), pages 3319 - 3322, XP002929653
Attorney, Agent or Firm:
Takashima, Hajime (Fushimimachi 4-chome Chuo-ku Osaka-shi Osaka, JP)
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