JP2006237359A - 波長走査型ファイバレーザ光源 - Google Patents
波長走査型ファイバレーザ光源 Download PDFInfo
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Abstract
【解決手段】光ファイバループに発振波長にゲインを有するゲイン媒体と光サーキュレータ13,14を設け、光サーキュレータ13,14で取り出された光をコリメートレンズ22,24で拡大する。その光軸上にポリゴンミラー25を設け、ポリゴンミラー25を回転させる。ポリゴンミラー25で反射された光の受光位置に回折格子27を設ける。回折格子27は入射光と同一方向に光を反射するリトロー構成とする。回折格子27への入射角度によって選択波長が変化し、2回の入射により選択度が増す。従って高速でポリゴンミラー25を回転させて選択波長を変化させても、挟帯域のままで発振波長を変化させることができる。
【選択図】図1
Description
YAMASHITA ET AL., IEEE JOURAL ON SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL.7, NO.1 JANUARY/FEBRUARY 2001, PP41〜43
Λ(sinγ+sinδ)kλ ・・・(1)
ここでkは次数であり、0,±1,±2・・・の値となる。さて回折光にはリトロー配置とリットマン配置とがある。リトロー配置では−1次の回折光と入射光の角度が等しい。従って(1)式においてγ=δ−1とすると、(1)式より回折光の波長は次式で決定される。
λ=2Λsinγ ・・・(2)
ここでΛはグレーティングのピッチ(μm)、即ち単位長さ当たりの格子線数a(本/mm)の逆数である。尚、リットマン配置では入射光と反射光の角度は一致していない。
λ=2Λsin(β+ν) ・・・(3)
ここでΛは回折格子ピッチ(μm)であり、回折格子定数aの定数(本/mm)の逆数である。又回折格子による選択波長の半値幅Δλは次式で与えられる。
Δλ=λ2/{2πWtan(β+ν)} ・・・(4)
ここでWは回折格子27に加わる光の光ビーム径であり、β+νは回折格子に対する入射角である。式(3)より明らかなように入射角が大きくなれば選択波長が長く、入射角が小さくなれば短波長となる。そして入射角が大きくなれば図6に示されるように、回折格子の面上に投影される光ビーム径も大きくなるため、λ2はほぼ一定と考えると、半値幅Δλは短波長となるほど太くなる。
W3=M2W2 ・・・(5)
又この拡大率M2は次式で与えられる。
M2=(cosφ・cosν)/(cosθ・cosμ) ・・・(6)
尚、ビームエキスパンダ31においても同様にビーム径が拡大され、元の光ビーム径W1がW3に拡大される。
11 光ファイバ
12 ゲイン媒体
13,14,41,51 光サーキュレータ
15 光カップラ
16 偏波コントローラ
17 エルビウムドープドファイバ
18 半導体レーザ
19 WDMカップラ
21,23 光ファイバ
22,24 コリメートレンズ
25 ポリゴンミラー
26 駆動部
27 回折格子
31,32 ビームエキスパンダ
61 半導体光増幅器
71 偏波面保存型光ファイバ
81 ミラー
82 ガルバノメータ
91,92 スポット
93 ミラー
Claims (13)
- レーザ発振の光路となる光ファイバループと、
前記光ファイバループに接続され、発振する波長に利得を有するゲイン媒体と、
前記光ファイバループより複数の光を分岐すると共に、分岐光と同一の光路で光を前記光ファイバループに戻す光分岐入射部と、
前記光分岐入射部で分岐された複数の分岐光が与えられ、夫々同一の波長を連続的に可変させつつ選択し、選択した波長の光を同一の光路で光分岐入射部に与える波長可変光フィルタと、
前記光ファイバループに接続され、前記光ファイバループを通過する光の一部を取り出す光学カップラと、を具備し、
前記波長可変フィルタは、
前記光分岐入射部より得られる光ビームの反射角度を一定範囲で周期的に変化させる光ビーム偏向部と、
前記光ビーム偏向部で偏向された光が入射され、入射角と同一方向に入射角に応じて変化する選択波長の光を反射する回折格子と、を具備することを特徴とする波長走査型ファイバレーザ光源。 - 前記光分岐入射部は、夫々2つの端子が前記光ファイバループに接続された第1,第2の3ポート型光サーキュレータであることを特徴とする請求項1記載の波長走査型ファイバレーザ光源。
- 前記光分岐入射部は、前記光ファイバループに接続された4ポート型光サーキュレータであり、第1の端子及び第4の端子が光ファイバループに接続され、第2及び第3の端子が夫々並列に前記波長可変フィルタに接続されていることを特徴とする請求項1記載の波長走査型ファイバレーザ光源。
- 前記光分岐入射部は、
前記光ファイバループに接続された第1の光サーキュレータと、
前記光学カップラの出射側に接続され、出射された光の一部を分岐して前記波長可変フィルタに入射する第2の光サーキュレータと、を有することを特徴とする請求項1記載の波長走査型ファイバレーザ光源。 - レーザ発振の光路となる光ファイバループと、
前記光ファイバループに接続され、発振する波長に利得を有するゲイン媒体と、
前記光ファイバループより光を分岐すると共に、分岐光と同一の光路で光を前記光ファイバループに戻す光分岐入射部と、
前記光分岐入射部で分岐された分岐光が与えられ、波長を連続的に可変させつつ選択し、選択した波長の光を同一の光路で光分岐入射部に与える波長可変光フィルタと、
前記光ファイバループに接続され、前記光ファイバループを通過する光の一部を取り出す光学カップラと、を具備し、
前記波長可変フィルタは、
前記光分岐入射部より得られる光ビームを反射し、軸を中心として一定範囲でその反射角度を周期的に変化させる光ビーム偏向部と、
前記光ビーム偏向部で偏向された光が第1の光路を通って入射され、入射角に応じて変化する選択波長の光を前記光ビーム偏向部の軸からみて同一方向に前記第1の光路とは異なる第2の光路を通って反射する回折格子と、
前記第2の光路を通って前記光ビーム偏向部で反射され、第3の光路を通って入射された光を第3の光路に折り返し反射するミラーと、を具備することを特徴とする波長走査型ファイバレーザ光源。 - 前記光ファイバループは、偏波面保存型の光ファイバを含んで構成したことを特徴とする請求項1記載の波長走査型ファイバレーザ光源。
- 前記ゲイン媒体は、前記光ファイバループの一部を構成する光ファイバ増幅器であることを特徴とする請求項1記載の波長走査型ファイバレーザ光源。
- 前記ゲイン媒体は、光を増幅する半導体光増幅器であることを特徴とする請求項1記載の波長走査型ファイバレーザ光源。
- 前記光ファイバループには、光ファイバループを通過する光の偏波方向を一定方向に規定する偏波コントローラを更に有することを特徴とする請求項1記載の波長走査型ファイバレーザ光源。
- 前記波長可変フィルタの光ビーム偏向部は、
前記光ファイバより出射される光軸上に配置され、回転によって光の反射角を変化させる複数の反射面を有するポリゴンミラーと、
前記ポリゴンミラーを回転させて光の反射角度を制御する駆動部と、を有することを特徴とする請求項1記載の波長走査型ファイバレーザ光源。 - 前記波長可変フィルタの光ビーム偏向部は、
前記光ファイバより出射される光軸上に配置され、回転によって光の反射角を変化させるミラーと、
前記ミラーを一定の角度範囲で回動させるガルバノメータと、を有することを特徴とする請求項1記載の波長走査型ファイバレーザ光源。 - 前記波長可変フィルタは、
前記光ビーム偏向部で偏向された光ビームのビーム径を拡大するビームエキスパンダを更に有し、
前記ビームエキスパンダは選択波長が短くなるに従って拡大率を大きくするものであることを特徴とする請求項1記載の波長走査型ファイバレーザ光源。 - 前記ビームエキスパンダは、
前記光ファイバより得られる光ビームのビーム径を拡大し、前記光ビーム偏向部の前に配置された第1のビームエキスパンダと、
前記第1のビームエキスパンダから得られる光ビームのビーム径を拡大する第2のビームエキスパンダとを有することを特徴とする請求項12記載の波長走査型ファイバレーザ光源。
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Cited By (49)
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WO2008093448A1 (ja) | 2007-01-29 | 2008-08-07 | Optical Comb, Inc. | 波長走査型光源及び光コヒーレンストモグラフィー装置 |
JP2009016396A (ja) * | 2007-06-29 | 2009-01-22 | Optical Comb Inc | 波長走査型ファイバレーザ光源 |
JP2010522437A (ja) * | 2007-03-23 | 2010-07-01 | ザ ジェネラル ホスピタル コーポレイション | 角度走査及び分散手順を用いて波長掃引レーザを利用するための方法、構成及び装置 |
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US20060251131A1 (en) | 2006-11-09 |
US20060193352A1 (en) | 2006-08-31 |
JP4628820B2 (ja) | 2011-02-09 |
US7382809B2 (en) | 2008-06-03 |
US7489713B2 (en) | 2009-02-10 |
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