JP5972356B2 - ラマン分布帰還型ファイバレーザ、およびそれを用いるハイパワーレーザシステム - Google Patents
ラマン分布帰還型ファイバレーザ、およびそれを用いるハイパワーレーザシステム Download PDFInfo
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- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
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- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/082—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression
- H01S3/0823—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression incorporating a dispersive element, e.g. a prism for wavelength selection
- H01S3/0826—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression incorporating a dispersive element, e.g. a prism for wavelength selection using a diffraction grating
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—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
- H01S3/09—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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- H01S3/09—Processes or apparatus for excitation, e.g. pumping
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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
- H01S3/094046—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser of a Raman fibre laser
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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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- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
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Description
この出願は、2011年4月25日に出願された米国仮特許出願第61/478,677号の利益を主張するものであり、当該仮特許出願が参照により本明細書に援用される。以下の参考文献が参照により本明細書に援用される:(1)V.E.Perlin、およびH.G.Winful著、「Distributed Feedback Fiber Raman Laser(分布帰還型ファイバラマンレーザ)」、IEEE Journal of Quantum Electronics、2001年、第37巻、p.38;(2)Y.Hu、およびN.G.R.Broderick著、「Improved design of a DFB Raman fiber laser(DFBラマンファイバレーザの改良された設計)」、Opt. Comm.、2009年、第282巻、p.3356;(3)J.Shi、およびM.Ibsen著、「Effects of phase and amplitude noise on π phase−shifted DFB Raman fibre lasers(位相がπずれたDFBラマンファイバレーザにおける位相、および振幅ノイズの影響)」Bragg Gratings Poling and Photosensitivity、2010年、JThA30;および(4)Agrawal著、Nonlinear Fiber Optics、 3rd ed.、Academic Press、2001年、 Eq.(2.3.34)、 p.47。
(1)回折格子を描画する間のUV照射による損失
(2)高い均一性を有する長い回折格子を作製することの困難さ
(3)カー非線形性により誘発されるブラッグ波長の変動
(4)例えば、屈折率変化を引き起こす、回折格子に沿ったファイバ内における不均一な温度分布に起因する変動
(5)高い要求ポンプパワー。
ここで、ファイバの長さに沿う縦方向の座標z、平均(有効)屈折率n、dc屈折率変化Δndc(z)、屈折率変化の変調振幅Δnac(z)(「回折格子の強度」)、回折格子の位相φ(z)、および回折格子の周期Λである。そのような回折格子は、ファイバの異なるモードを結合するため、すなわち異なるモード間でエネルギーを変換するために用いることができる。(同じ方向に進行する)異なる共伝搬モードが結合される場合、共伝搬モードの空間周波数の間の差は小さいため、回折格子の要求される空間周波数1/Λは比較的小さい。典型的には数10ミクロンから数100ミクロンの範囲にわたるこの大きなΛによって、そのような回折格子は、長周期回折格子とも呼ばれる。
WDM、およびアイソレータを通して測定された出力スペクトルが図4aおよび4bに示され、それぞれ位相のずれが内側および外側に向いていた。1584nmの同じ波長での発振が両方向について観察された。
Claims (9)
- ポンプ光源から放射を受けることが可能な光入力部、および
ラマン放射を光出力部に提供することが可能な少なくとも一つのブラッグ回折格子を含む、長さが20cmより短いラマン利得ファイバ
を含むラマンレーザであって、
少なくとも一つのブラッグ回折格子が位相のずれを備え、その場合において、前記ブラッグ回折格子が、前記ブラッグ回折格子の長さの少なくとも一部に沿ってブラッグ波長の偏位を生じさせるためにチャープされ、その場合において、関連する光場の強度が前記ブラッグ回折格子の長さの異なる部分について大きく、その場合において、最も大きい負のブラッグ波長の偏位の位置が、前記少なくとも一つのブラッグ回折格子の位相のずれの位置と一致する、ラマンレーザ。 - ポンプ光源から放射を受けることが可能な光入力部、および
ラマン放射を光出力部に提供することが可能な少なくとも一つのブラッグ回折格子を含む、長さが20cmより短いラマン利得ファイバ
を含むラマンレーザであって、
少なくとも一つのブラッグ回折格子が位相のずれを備え、
さらに前記ラマンレーザが、前記ブラッグ回折格子の長さの少なくとも一部に沿う温度の偏位を制御するための温度制御要素を含み、その場合において、関連する光場の強度が前記ブラッグ回折格子の長さの異なる部分について大きく、その場合において、最も大きい温度の偏位の位置が、前記位相のずれの位置と一致する、ラマンレーザ。 - ポンプ光源から放射を受けることが可能な光入力部、および
ラマン放射を光出力部に提供することが可能な少なくとも一つのブラッグ回折格子を含む、長さが20cmより短いラマン利得ファイバ
を含むラマンレーザであって、
少なくとも一つのブラッグ回折格子が位相のずれを備え、
さらに前記ラマンレーザが、前記ブラッグ回折格子の長さの少なくとも一部に沿う歪の偏位を制御するための歪制御要素を含み、その場合において、関連する光場の変化の強度が前記ブラッグ回折格子の長さの異なる部分について大きく、その場合において、最も大きい歪の偏位の位置が、前記位相のずれの位置と一致する、ラマンレーザ。 - 前記位相のずれが約πラジアンである、請求項1に記載のラマンレーザ。
- 前記波長の偏位が関連する光の場の強度にほぼ比例する、請求項1に記載のラマンレーザ。
- 前記温度制御要素が加熱装置である、請求項2に記載のラマンレーザ。
- 前記温度制御要素が冷却装置である、請求項2に記載のラマンレーザ。
- 前記位相のずれが約πラジアンである、請求項2に記載のラマンレーザ。
- 前記ブラッグ回折格子が、前記ブラッグ回折格子の長さの少なくとも一部に沿ってブラッグ波長の偏位を生じさせるためにチャープされ、その場合において、関連する光場の強度が前記ブラッグ回折格子の長さの異なる部分について大きく、その場合において、最も大きい負のブラッグ波長の偏位の位置が、前記少なくとも一つのブラッグ回折格子の前記位相のずれの位置と一致する、請求項2に記載のラマンレーザ。
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US201161478677P | 2011-04-25 | 2011-04-25 | |
US61/478,677 | 2011-04-25 | ||
PCT/US2012/035065 WO2012149068A1 (en) | 2011-04-25 | 2012-04-25 | Raman distributed feedback fiber laser and high power laser system using the same |
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EP (1) | EP2702652A4 (ja) |
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KR (1) | KR20140026522A (ja) |
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CN103597675B (zh) | 2017-06-06 |
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US20140112357A1 (en) | 2014-04-24 |
US9325152B2 (en) | 2016-04-26 |
EP2702652A1 (en) | 2014-03-05 |
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