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Broad-band variable-wavelength laser beam generator

外国特許コード F110005349
整理番号 K01206US
掲載日 2011年8月31日
出願国 アメリカ合衆国
出願番号 48481102
公報番号 20040174914
公報番号 7154920
出願日 平成14年7月31日(2002.7.31)
公報発行日 平成16年9月9日(2004.9.9)
公報発行日 平成18年12月26日(2006.12.26)
国際出願番号 JP2002007782
国際公開番号 WO2003012544
国際出願日 平成14年7月31日(2002.7.31)
国際公開日 平成15年2月13日(2003.2.13)
優先権データ
  • 特願2001-231555 (2001.7.31) JP
  • 2002WO-JP07782 (2002.7.31) WO
発明の名称 (英語) Broad-band variable-wavelength laser beam generator
発明の概要(英語) (US7154920)
There is provided a broadly tunable laser beam generator serving as a laser beam source which utilizes a nonlinear optical effect of a silica (glass) fiber and which is broadly tunable in the near-infrared region, having ultra-broad tunability which has not been easily achieved by known tunable lasers, and generating coherent light which can be continuously swept over the entire wavelength region with a simple mechanical operation of a single wavelength selecting element and which is emitted in a constant direction independent of its wavelength.
The laser beam source which utilizes a nonlinear optical effect of a silica optical fiber ( 8 ) and which is broadly tunable in the near-infrared region has ultra-broad tunability and generates coherent light which can be continuously swept over the entire wavelength region with a single wavelength selecting element ( 10 ).
特許請求の範囲(英語) [claim1]
1. A broadly tunable laser beam generator comprising: a pump pulse laser;
an output-coupling half-mirror configured to pass a pulse beam emitted from the pump pulse laser therethrough;a silica optical fiber configured to receive the pulse beam from the output-coupling half-mirror via a first collective collimator lens, the silica optical fiber having a birefringence and a cut-off wavelength from 1100 to 1300 nm;
and
a single-wavelength selecting element configured to receive the beam emitted from the silica optical fiber via a second collective collimator lens and feeding back a light with a specific wavelength,wherein the feedback light with the specific wavelength is received by the silica optical fiber via the second collective collimator lens, amplified to obtain a gain while propagating through the fiber twice, emitted from the fiber, converted into collimated light by the first collective collimator lens, and emitted from the output-coupling half-mirror as an output light beam.
[claim2]
2. The broadly tunable laser beam generator according to claim 1, wherein the tunability is completely continuous to a degenerate region close to the pump light.
[claim3]
3. The broadly tunable laser beam generator according to claim 1, wherein by coupling a pulse laser beam source with an end face of the fiber so as to input a pulse laser beam having a short wavelength close to the cut-off wavelength into the end face of the fiber as pump light, stimulated Raman scattering and stimulated parametric four-lightwave mixing occur in the silica fiber so as to provide a gain spectrum continuously extending over both shorter and longer wavelength regions with respect to a wavelength of the pump light, and consequently to provide ultra-broadband tunability, the ultra-broad tunability lying from 800 nm to 1875 nm.
  • 発明者/出願人(英語)
  • FUKATSU SUSUMU
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 372/20
  • 359/341.1
  • 372/29.02
参考情報 (研究プロジェクト等) PRESTO Organization and Function AREA
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