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Optical frequency linear chirp variable unit

外国特許コード F110003432
整理番号 A111-34WO
掲載日 2011年6月27日
出願国 欧州特許庁(EPO)
出願番号 04722683
公報番号 1615066
公報番号 1615066
出願日 平成16年3月23日(2004.3.23)
公報発行日 平成18年1月11日(2006.1.11)
公報発行日 平成27年1月7日(2015.1.7)
国際出願番号 JP2004003911
国際公開番号 WO2004086118
国際出願日 平成16年3月23日(2004.3.23)
国際公開日 平成16年10月7日(2004.10.7)
優先権データ
  • 2004JP003911 (2004.3.23) WO
  • 特願2003-081170 (2003.3.24) JP
発明の名称 (英語) Optical frequency linear chirp variable unit
発明の概要(英語) A linear opto-frequency chirp amount variable apparatus using a dielectric multilayer film mirror which does not require the optical axis to be realigned each time the amount of a chirp is to be varied, comprises a pair of dielectric multilayer film mirrors (2) and (2) arranged so that their mirror surfaces (2a) and (2a) extends parallel, and are opposed, to each other, and a movable mirror (4) disposed in a space defined between the dielectric multilayer film mirrors (2) and (2).
The movable mirror (4) is inclined so that an incident light (5) that is incident obliquely from one end (3a) of the space (3) defined between the two dielectric multilayer film mirrors (2) and (2) and is then allowed to reflect on and between them a plurality of times is reflected by the movable mirror into a direction parallel to the dielectric multilayer film mirror surfaces (2a) and in an incidence plane defined by the incident light (5) and a plane-normal (6) to each dielectric multilayer film mirror (2) and towards that one end (3a).
The movable mirror (4) is movable in a direction that is parallel to the dielectric multilayer film mirror surfaces (2a) and extends in the incidence plane (7).
Moving the movable mirror (4) forwards and backwards in this direction changes the amount of a chirp to be imparted to the incident light as an input light.
特許請求の範囲(英語) [claim1]
1. A linear opto-frequency chirp amount variation apparatus comprising a pair of dielectric multilayer film mirrors (2) arranged so that their mirror surfaces extend parallel, and are opposed, to each other, characterised in that it also comprises a movable mirror (4,4a,4b) which is disposed in a space (3) defined between the two dielectric multilayer film mirrors (2) and which is inclined at a given inclination and movable in a given direction of movement, wherein
said given inclination of the movable mirror (4,4a,4b) is an inclination such that: (a) an incident light that is allowed to reflect from and between the two dielectric mirrors (2) a plurality of times is then reflected by the movable mirror (4,4a,4b) along a light path which has a direction parallel to said dielectric multilayer film mirror surfaces, or (b) an incident light that enters the space between the two dielectric mirrors along a light path parallel to the dielectric mirrors is then reflected by the movable mirror so that it is reflected from and between the two dielectric mirrors a plurality of times before exiting the space between the two dielectric mirrors, and said given direction of movement is the direction of the said light path,
whereby moving said movable mirror (4,4a,4b) forwards and backwards in said direction of movement changes the amount of a chirp to be imparted to said incident light as an input light.
[claim2]
2. A linear opto-frequency chirp amount variation apparatus according to claim 1, wherein
said given inclination of the movable mirror (4) is an inclination such that an incident light (5) that is incident obliquely from one end of the space defined between the two dielectric multilayer film mirrors and is then allowed to reflect on and between them a plurality of times is then reflected by the movable mirror (4) along the said light path (8) which has a direction parallel to said dielectric multilayer film mirror surfaces (2).
[claim3]
3. A linear opto-frequency chirp amount variation apparatus according to claim 1, wherein the movable mirror (4) is one of a pair of movable mirrors (4a,4b) which are disposed in a space defined between the two dielectric multilayer film mirrors (2) and each of which is inclined at a given inclination and movable in the given direction of movement, wherein
said given inclination of a first (4a) of the movable mirrors is an inclination such that an incident light (5) that is incident parallel to said dielectric multilayer film mirror surfaces (2) from one end of the space (3) defined between said multilayer film mirrors (2) is reflected by the first movable mirror (4a) so as to reflect on and between said mirror surfaces (2) a plurality of times,
said given inclination of the second (4b) of the movable mirrors is an inclination such that said incident light having reflected a plurality of times as aforesaid is reflected by the second movable mirror (4b) along the said path (80 which is parallel to said dielectric multilayer film mirror surfaces (2) and towards the other end of said space (3),
whereby moving said first or second movable mirror (4a or 4b) forwards or backwards in said movable direction to change the distance between them changes the amount of a chirp to be imparted to said incident light as an input light.
[claim4]
4. A linear opto-frequency chirp amount variation apparatus according to claim 1, characterized in that it further comprises a fixed mirror (9) disposed in a space defined between the two dielectric multilayer film mirrors, the fixed mirror having a first (9a) and a second (9b) reflecting surface each of which is inclined at a given inclination; wherein the movable mirror is one of a pair of first (4a) and second (4b) movable mirrors which are disposed at opposite sides of the fixed mirror (9), respectively, and each of which is movable in a given movable direction, wherein
said given inclination of the first reflecting surface (9a) of said fixed mirror (9) is an inclination such that an incident light (5) that is incident parallel to said dielectric multilayer film mirror surfaces (2) from one end of the space (3) defined between said two dielectric multilayer film mirrors is reflected by said first reflecting surface (9a) so as to reflect on and between said dielectric multilayer film mirrors (2) a plurality of times,
said given inclination of the first movable mirror (4a) is an inclination such that the incident light having reflected a plurality of times as aforesaid is reflected by said first movable mirror (4a) into a direction that is parallel to said dielectric multilayer film mirror surfaces (2) and extends towards said second movable mirror (4b),
said given inclination of the second movable mirror (4b) is an inclination such that the light having reflected from said first movable mirror (4a) is reflected by said second movable mirror (4b) so as to reflect on and between said dielectric multilayer film mirrors (2) a plurality of times,
said inclination of the second reflecting surface (9b) of said fixed mirror (9) is an inclination such that the light from said second movable mirror (4b), upon having reflected a plurality of times as aforesaid, is reflected by said second reflecting surface (9b) along the said light path (8) which has a direction parallel to said dielectric multilayer film mirror surfaces (2) towards the other end of said space (3), and
whereby moving said first or second movable mirror (4a,4b) forwards or backwards in said movable direction to change the distance between them changes the amount of a chirp to be imparted to said incident light as an input light.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • MATSUDA ISAO
  • MISAWA KAZUHIKO
  • LANG HIROYOSHI
国際特許分類(IPC)
欧州特許分類/主・副
  • G02B006/293I12
  • G02B026/00F
指定国 Contracting States: DE FR GB
参考情報 (研究プロジェクト等) CREST Function Evolution of Materials and Devices based on Electron/Photon Related Phenomena AREA
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