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Littrow external oscillator semiconductor laser optical axis deviation correction method and device

外国特許コード F110005327
整理番号 E07002WO
掲載日 2011年8月31日
出願国 アメリカ合衆国
出願番号 58738705
公報番号 20080031293
公報番号 7706425
出願日 平成17年4月22日(2005.4.22)
公報発行日 平成20年2月7日(2008.2.7)
公報発行日 平成22年4月27日(2010.4.27)
国際出願番号 JP2005007675
国際公開番号 WO2005109586
国際出願日 平成17年4月22日(2005.4.22)
国際公開日 平成17年11月17日(2005.11.17)
優先権データ
  • 特願2004-140503 (2004.5.11) JP
  • 2005JP007675 (2005.4.22) WO
発明の名称 (英語) Littrow external oscillator semiconductor laser optical axis deviation correction method and device
発明の概要(英語) A Littrow-type external-cavity diode laser optical axis displacement correction method and device to easily, inexpensively, and accurately correct displacement of optical axis in Littrow-type ECDLs is provided.
In the Littrow-type ECDL optical axis displacement correction device and method, a means for introducing a laser beam, a jig 36 for integrally fixing a diffraction grating 33 and a prism 35 into which the laser beam is introduced in a predetermined arrangement, and a rotary shaft 34 capable of integrally rotating the diffraction grating 33 and the prism 35 are included.
By the rotation of the diffraction grating 33 and the prism 35 around the rotary shaft 34, the wavelength of the incident light can be changed, and the optical axis of the output light 39 is not changed by the change of the wavelength.
従来技術、競合技術の概要(英語) BACKGROUND ART
Tunable lasers have been frequently used in the field of atomic spectroscopy, molecular spectroscopy, laser cooling, semiconductor quantum dot spectroscopy, and in the study of quantum information processing.
As such devices, large dye lasers, ti-sapphire lasers and the like have been commercially available by optical component manufacturers.
Recently, more inexpensive and compact external cavity diode laser (ECDLs) have come onto the market.
In the ECDLs, there are two types; the Littrow-type and the Littman-type.

特許請求の範囲(英語) [claim1]
1. A Littrow-type external-cavity diode laser optical axis displacement correction method, comprising: inputting laser light from a laser source into a diffraction grating and a prism integrally fixed by a jig such that the laser light is reflected by the diffraction grating and zero-order diffraction light enters the prism through a first surface (a) of the prism, the zero-order diffraction light then being reflected within the prism off a second surface (b) of the prism so that the zero-order diffraction light exits the prism as output light through a third surface (c) of the prism in the opposite direction of the laser source; and
while the wavelength of the output light is changed by rotating the diffraction grating and the prism around a rotary shaft, the zero-order diffraction light is reflected and refracted within the prism so that the optical axis of the output light is not changed by the change in the wavelength of the output light.
[claim2]
2. A Littrow-type external-cavity diode laser optical axis displacement correction device comprising: a laser source configured to introduce a laser beam;
a jig in which a diffraction grating and a prism are integrally fixed; and
a rotary shaft configured to integrally rotate the diffraction grating and the prism,
wherein the diffraction grating and the prism are fixed so that the laser beam is reflected off the diffraction grating and zero-order diffraction light enters the prism through a first surface (a) of the prism, and so that the zero-order diffraction light is reflected within the prism off a second surface (b) of the prism so that the zero-order diffraction light exits the prism as output light through a third surface (c) of the prism in the opposite direction of the laser source, so that the optical axis of the output light is not changed by a change in the wavelength of the output light.
[claim3]
3. The Littrow-type external-cavity diode laser optical axis displacement correction device according to claim 2, wherein the prism is a column-shaped prism including a bottom surface of a right-angled isosceles triangle.
[claim4]
4. The Littrow-type external-cavity diode laser optical axis displacement correction device according to claim 3, wherein a grating surface of the diffraction grating and a surface that is a hypotenuse of the right-angled isosceles triangle of the column-shaped prism are arranged in parallel.
  • 発明者/出願人(英語)
  • TAKAMIZAWA AKIFUMI
  • EDAMATSU KEIICHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 372/100
  • 359/578
  • 359/589
  • 372/99
  • 372/102
参考情報 (研究プロジェクト等) ERATO OHNO Semiconductor Spintronics AREA
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