JP5516522B2 - 高パワー短パルスファイバレーザ - Google Patents
高パワー短パルスファイバレーザ Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1028—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/16—Solid materials
- H01S3/1691—Solid materials characterised by additives / sensitisers / promoters as further dopants
- H01S3/1698—Solid materials characterised by additives / sensitisers / promoters as further dopants rare earth
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- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0064—Anti-reflection devices, e.g. optical isolaters
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0078—Frequency filtering
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- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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Description
〔1〕U.S. Patent Application No. 09/576,772 filed on May23,2000 by M.E. Fermann, A. Galvanauskas, and D. Harter entitled “Modular, high energy, widely-tunable ultrafast fiber source”(Docket No. IM-83)
〔2〕U.S. Patent Application No. 10/627,069 filed on July 24, 2003 by M.E. Fermann, and G.C. Cho entitled “Integrated Fiber Laser Pulse Source With Pulse Width Control”(Docket No. IMRAA. 021A/IM-99)
〔3〕U.S. Patent No. 6,151,338 issued to S.G. Grubb, D.F. Welch, and R.Zanoniin November 21, 2000 entitled “High power laser optical amplifier system”
〔4〕O.G. Okhotnikov, L.A. Gomes, N. Xiang T. Jouhti, A.K. Chin, R. Singh, and A.B. Grudinin, “980-nm picosecond fiber laser” IEEE Photonics Technology Letters, 15(11),1519-1521(2003)
〔5〕H. Lim, F.O. Ilday, and F.W. Wise, “Generation of 2-nJ pulse from a femtosecond ytterbium fiber laser” Optics Letters, 28(8),660-662(2003)
(1)光パルスを出力するモードロックファイバ発振器と、
前記光パルスを受け取るために前記モードロックファイバ発振器に光学的に接続され、前記光パルスに利得を与える利得媒質を有する増幅器と、
前記モードロック発振器と前記増幅器との間に配置され、前記モードロックファイバ発振器から前記増幅器に結合される前記光エネルギが減少されるように調節可能な伝導をもつ可変減衰器と、
パルス幅を減少させるためにパルスを圧縮するための圧縮器と、
を有する、持続時間と対応するパルス幅とをもつパルスを出力するパルスファイバレーザ。
(2)前記可変減衰器は、偏光選択光学系を有する(1)のパルスファイバレーザ。
(3)前記可変減衰器は、偏光子を有する(2)のパルスファイバレーザ。
(4)前記可変減衰器は、さらに偏光回転素子を有する(3)のパルスファイバレーザ。
(5)前記偏光回転素子は、波長板を有する(4)のパルスファイバレーザ。
(6)前記可変減衰器は、ハウジングに入れられた一つ以上の光学素子を有し、ハウジングは、前記一つ以上の光学素子に光を結合するために、そこから延びる入力と出力のファイバをもつ、(1)のパルスファイバレーザ。
(7)増幅器から前記増幅された光パルス出力を受け取るために光学的結合され、前記ファイバ増幅器での前記光パルス出力の持続時間を短縮する一つ以上の分散光学素子を有する、パルス圧縮器をさらに有する(1)のパルスファイバレーザ。
(8)前記一つ以上の分散光学素子は、分散光ファイバを有する(7)のパルスファイバレーザ。
(9)レーザパルスを繰り返し生成するためにレーザ共振器の縦モードを実質上モードロックするステップと、
前記レーザパルスを増幅するステップと、
前記レーザパルスをチャープさせ、それにより前記光パルスの光周波数を時間に関して変化させるステップと、
短縮された持続時間をもつ圧縮されたレーザパルスを生成するために、前記レーザパルスの異なる光周波数成分を異なるように伝搬させることで前記レーザパルスを圧縮するステップと、
前記圧縮されたレーザパルスの前記持続時間をさらに短縮するために、前記レーザパルスの前記増幅ステップの前に前記レーザパルスを選択的に減衰するステップと、
を有する少なくとも約200mWの光パワーと約200フェムト秒以下のパルス持続時間とをもつ圧縮された高パワー短レーザパルスを生成する方法。
(10)前記レーザパルスは、約1と20dBの間で減衰される(9)の方法。
(11)前記増幅ステップの後の前記レーザパルスの偏光を前記レーザパルスの前記圧縮ステップまで保持するステップをさらに有する(9)の方法。
(12)光パルスを出力するファイバ式発振器をモードロックするステップと、
増幅器を可変減衰器を通して前記ファイバ式発振器に光学的に結合し、前記ファイバ式発振器からの前記光パルスを前記可変減衰器を通して前記増幅器に与えるようにするステップと、
前記増幅器に供給される光パルスの強度を減少させ、前記パルスを短縮するために、前記光パルスの測定に基づいて前記可変減衰器を調節するステップと、
を有する高パワー短パルスファイバレーザを製造する方法。
(13)前記光パルスを短縮するためにパルス圧縮器を前記増幅器に光学的に結合するステップをさらに有する(12)の方法。
(14)前記ファイバ式発振器からの前記光パルスを増幅するために前記増幅器をポンプするステップと、
前記光パルスを圧縮するステップと、をさらに有し、
前記増幅ステップと圧縮ステップとの後の前記光パルスが、少なくとも約200mWの平均パワーと少なくとも200フェムト秒より短いパルス持続時間とをもつ(12)の方法。
(15)前記可変減衰器は、前記光パルスのパワーの測定に基づいて調整される(12)の方法。
(16)前記可変減衰器は、前記出力パルスのパルス持続時間の測定に基づいて調整される(12)の方法。
(17)前記減衰器を密閉されたハウジングにパッケージするステップをさらに有する(12)の方法。
(18)前記発振器の少なくとも一部を密閉されたハウジングにパッケージするステップをさらに有する(12)の方法。
Claims (2)
- スペクトルバンド幅を備える対応するスペクトルパワー分布をもつモードロックされた光出力パルス列を生成するようにファイバ共鳴共振器の縦モードを実質上モードロックするステップと、
前記ファイバ共鳴共振器の外部のスペクトルフィルタを用いて、前記スペクトルパワー分布の一部を減衰させることによって、前記モードロックされた光出力パルスの前記スペクトルバンド幅を約5nmから12nmの間に減少させるステップと、
前記ファイバ共鳴共振器の外部の増幅器を用いて前記スペクトルバンド幅が減少された光出力パルスを増幅するステップと、
圧縮された光パルスを生成するために前記ファイバ共鳴共振器の外部の圧縮器を用いて前記増幅された光出力パルスを圧縮するステップと、
を有する、圧縮された光パルスを生成する方法。 - 前記スペクトルバンド幅は、約10nm未満に減少される請求項1の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/814,319 US7804864B2 (en) | 2004-03-31 | 2004-03-31 | High power short pulse fiber laser |
US10/814,319 | 2004-03-31 |
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JP5516522B2 true JP5516522B2 (ja) | 2014-06-11 |
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US9071037B2 (en) | 2015-06-30 |
US8537864B2 (en) | 2013-09-17 |
US20050226278A1 (en) | 2005-10-13 |
WO2005094379A2 (en) | 2005-10-13 |
JP2011228738A (ja) | 2011-11-10 |
JP5223334B2 (ja) | 2013-06-26 |
US7804864B2 (en) | 2010-09-28 |
JP2007532005A (ja) | 2007-11-08 |
US20150085885A1 (en) | 2015-03-26 |
US9640940B2 (en) | 2017-05-02 |
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US20150325977A1 (en) | 2015-11-12 |
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