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EXTERNAL RESONATOR LASER

Foreign code F120006368
File No. S2010-0254-C0
Posted date Mar 27, 2012
Country WIPO
International application number 2010JP073841
International publication number WO 2011081212
Date of international filing Dec 30, 2010
Date of international publication Jul 7, 2011
Priority data
  • P2009-299284 (Dec 30, 2009) JP
Title EXTERNAL RESONATOR LASER
Abstract Disclosed is an ASE-free external resonator laser in which reduction in tuning range and decrease in output are suppressed. The external resonator laser comprises: a fixed support body which has a half mirror that partially reflects incident light and partially transmits incident light fixed therein; and a rotary support body which is rotatably supported by the fixed support body by way of a shaft, and which has a laser chip that emits light, a collimator lens that collimates light emitted from the laser chip, and a diffraction grating that diffracts light emitted from the laser chip, fixed therein.
Outline of related art and contending technology BACKGROUND ART
A tunable laser may be, in the field of analysis of chemical substances or a material structure that is useful, as one of the tunable laser is the external cavity laser. In general the external cavity laser, and the optical gain medium (light source), the optical gain medium to resonate the light emitted from the external resonator, the external cavity to tune the resonance frequency of the oscillation wavelength can be adjusted. In particular, a semiconductor laser diode and an external cavity laser includes a gain medium, to cope with a wide wavelength range, and, a compact, easily manufactured at relatively low cost is an advantage.
Are various types of external cavity laser for which there is, for example, without the mode hop wavelength can be continuously changed as a laser, Littrow type or Littman-type resonator arrangement has been known. Littman type may be the same way as the Littrow type, using a diffraction grating is configured in an external cavity, the laser beam with respect to the Littrow type diffraction grating is rotated on the other hand, in the Littman-type diffraction grating is fixed with respect to the beam. Therefore, the area of the laser light irradiated to the diffraction grating can be made wider, a high resolution the size of the resonator arrangement can be realized, in addition, the exit direction of light output when changing the wavelength does not change due to the low level of, is widely used as a tunable laser.
Littrow-type external resonator laser is a technology relating to literature includes following non-patent document 1 is. Further, Littman-type external cavity laser as a technology relating to references, the non-patent document 2, and, are described in Patent Document 1 to 3.
Among these, Littman type of external cavity laser and a broadband continuous wavelength tuning, for tuning the output beam without shaking, the wavelength-variable laser has been used in the exemplary external resonator they are arranged. However, the diffraction grating 0 for taking out the first-order diffraction light as the output beam, the spontaneous emission of the laser diode so that the superimposed on the output beam, such as Raman scattering spectroscopy and detection of weak absorption or reflection of light in a highly precise measurement is a serious problem. The solution to this problem has been devised to the prior art described in Patent Document 4 to 8 respectively.
Scope of claims (In Japanese)請求の範囲 [請求項1]
 入射される光を一部反射し、一部を透過するハーフミラーが固定された固定支持体と、
前記固定支持体に軸を介して回転可能に支持され、かつ、光を放出するレーザチップ、前記レーザチップから放出される光をコリメートするコリメートレンズ、及び、前記レンズでコリメートされた光を回折させる回折格子が固定されてなる回転支持体と、を有する外部共振器レーザ。

[請求項2]
 前記レーザチップ、前記回折格子及び前記ハーフミラーはLittman型の共振器配置となっている請求項1記載の外部共振器レーザ。

[請求項3]
 前記コリメートレンズによってコリメートされた楕円形のレーザビームを、回折格子での回折を介して、円形ビームに近い形になるように変換して、ハーフミラーから出力ビームとして取り出す請求項1記載の外部共振器レーザ。

[請求項4]
 回転支持体に固定されるペルチェ素子と、該ペルチェ素子に接続されるヒートパイプ付冷却フィンと、を備えた冷却部材と、を有する請求項1記載の外部共振器レーザ。

[請求項5]
 前記レーザチップは、曲がり導波路構造又は斜め導波路構造を用いる請求項1記載外部共振器レーザ。

[請求項6]
 前記レーザチップの前面に光散乱体ビームフィルタを配置してなる請求項1記載の外部共振器レーザ。

[請求項7]
 前記コリメートレンズと前記回折格子の間に1/2波長板を配置してなる請求項1記載の外部共振器レーザ。

[請求項8]
 前記ハーフミラーに近接してスリットを配置してなる請求項1記載の外部共振器レーザ。

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • National University Corporation Chiba University
  • Inventor
  • MURO Kiyohumi
  • ENDO Tomohisa
  • SHIMADA Yasutaka
  • FUKUOKA Daisuke
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BR BW BY BZ CA CH CL CN CO CR CU CZ DE DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IS JP KE KG KM KN KP KR KZ LA LC LK LR LS LT LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PE PG PH PL PT RO RS RU SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ MD RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG
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