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 (1-1 Namiki Tsukuba-shi, Ibaraki, Ibaraki, 305-0044, JP)
Tsunekawa, Takashi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Taniguchi, Koichi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Tadatomo, Kazuyuki (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Tsunekawa, Takashi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Taniguchi, Koichi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Tadatomo, Kazuyuki (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Application Number:
PCT/JP2000/003278
Publication Date:
November 30, 2000
Filing Date:
May 22, 2000
Export Citation:
Assignee:
MITSUBISHI CABLE INDUSTRIES, LTD. (8 Nishinocho, Higashimukaijima Amagasaki-shi, Hyogo, 660-0856, JP)
Nakamura, Masaru (1-1 Namiki Tsukuba-shi, Ibaraki, Ibaraki, 305-0044, JP)
Tsunekawa, Takashi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Taniguchi, Koichi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Tadatomo, Kazuyuki (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Nakamura, Masaru (1-1 Namiki Tsukuba-shi, Ibaraki, Ibaraki, 305-0044, JP)
Tsunekawa, Takashi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Taniguchi, Koichi (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
Tadatomo, Kazuyuki (Itami Factory of Mitsubishi Cable Industries, Ltd. 3 Ikejiri 4-chome Itami-shi, Hyogo, 664-0027, JP)
International Classes:
G01N21/01; G01N21/35; G02F1/39; G02F1/35; G01N21/01; G01N21/31; G02F1/35; (IPC1-7): G02F1/39; G01N21/01; G01N21/35
Attorney, Agent or Firm:
Takashima, Hajime (Fujimura Yamato Seimei Building 2-14, Fushimimachi 4-chome Chuo-ku Osaka-shi Osaka, 541-0044, JP)
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