JP2008513804A - モード選択同調器からの光フィードバック - Google Patents
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- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
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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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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02001—Interferometers characterised by controlling or generating intrinsic radiation properties
- G01B9/02002—Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies
- G01B9/02004—Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies using frequency scans
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- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02055—Reduction or prevention of errors; Testing; Calibration
- G01B9/02056—Passive reduction of errors
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02083—Interferometers characterised by particular signal processing and presentation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
- H01S5/141—External cavity lasers using a wavelength selective device, e.g. a grating or etalon
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B2290/00—Aspects of interferometers not specifically covered by any group under G01B9/02
- G01B2290/60—Reference interferometer, i.e. additional interferometer not interacting with object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
- G01J2009/028—Types
- G01J2009/0292—Fizeau; Wedge
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/0014—Measuring characteristics or properties thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
- H01S5/141—External cavity lasers using a wavelength selective device, e.g. a grating or etalon
- H01S5/142—External cavity lasers using a wavelength selective device, e.g. a grating or etalon which comprises an additional resonator
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Abstract
Description
12 周波数偏移干渉計
14 距離偏移干渉計
16,20,22 基準面
18 試験面
24 モード選択周波数可変レーザ
26 レーザ発振共振器
28 フィードバック共振器
30 回折格子
32 旋回軸
34,38,40 測定ビーム
36,46,50 ビームスプリッタ
44 対物鏡
48 カメラ
52 測定キャビティ
54 結像光学系
60 検出器
62,64,66,68 ファイバ
70 干渉パターン
74 回折格子制御装置
76 プロセッサ
D1,D2 光路長
Claims (12)
- レーザ用モードモニタリング装置において、
増幅を受ける一連の公称ビーム周波数モードを定める第1の光路長を有する前記レーザのレーザ発振共振器、
前記公称ビーム周波数モード間で前記レーザの出力を増分変化させるための同調器、
前記レーザ発振共振器に光接続され、前記公称ビーム周波数モード間の意図された周波数間隔に関係付けられる自由スペクトルレンジを定める第2の光路長を挟んで公称上隔てられる基準面を有する、測定キャビティ、及び
前記レーザからの前記ビーム周波数出力間の位相オフセット変化を検出するために干渉パターンの形態で前記測定キャビティから出力を受け取る検出器、
を備えることを特徴とする装置。 - 前記レーザ発振共振器の前記第1の光路長及び前記測定キャビティの前記第2の光路長が整倍数で関係付けられ、前記公称ビーム周波数モード間の前記周波数間隔が前記自由スペクトルレンジの整数倍であることを特徴とする請求項1に記載の装置。
- 前記測定ビーム周波数の偏移が前記自由スペクトルレンジの整数倍に相当し、前記同調器からの情報が前記自由スペクトルレンジの対応する整数倍の全数を決定するために処理され、前記検出器からの情報が、前記測定ビーム周波数がそれを挟んで偏移させられる前記自由スペクトルレンジの残余整分数倍部分を決定するために用いられることを特徴とする請求項2に記載の装置。
- (a)前記測定キャビティの前記基準面が、公称測定ビーム波長の少なくとも1/2にほぼ等しい距離変化範囲にわたり干渉縞パターンをつくるために相対的に傾けられ、
(b)前記検出器が、公称測定ビーム波長の少なくとも1/2のほぼ等しい前記基準面間の距離変化の範囲をサンプリングするために配向されたセンサアレイを有する、
ことを特徴とする請求項1に記載の装置。 - 前記センサアレイから収集されたデータを前記レーザからの個々のビーム周波数出力の位相オフセットの尺度に変換するためのプロセッサをさらに備え、前記プロセッサが、前記レーザからの前記ビーム周波数出力の前記公称周波数モード間の前記意図された周波数間隔からのずれを測定するための前記レーザからの前記ビーム周波数出力の前記位相オフセット間の比較を行うために構成されることを特徴とする請求項4に記載の装置。
- 前記プロセッサが前記センサアレイから収集された前記データを前記レーザからの前記個々のビーム周波数出力の総強度の尺度に変換するに必要な手段も備えることを特徴とする請求項5に記載の装置。
- 前記測定キャビティが相異なる自由スペクトルレンジを定めるための相異なる光路長で隔てられた基準面を有する複数の測定キャビティの内の第1の測定キャビティであり、前記第1の測定キャビティが第1の自由スペクトルレンジを有し、前記複数の測定キャビティの内の第2の測定キャビティがより広い範囲にわたるビーム周波数変化を測定するための第2の自由スペクトルレンジを有することを特徴とする請求項1に記載の装置。
- 光フィードバックを有する干渉法測定装置において、
試験面及び基準面上の対応する点の間の高さ変化を、複数の測定ビーム周波数において前記点のそれぞれについての干渉データを収集することによって測定する周波数偏移干渉計、
前記複数の測定ビーム周波数の間の周波数変化を、2つの基準面上の複数の対応する点において前記周波数のそれぞれについての干渉データを収集することによって測定する距離偏移干渉計、及び
前記周波数のそれぞれについての前記干渉データを前記ビーム周波数変化の尺度に変換し、前記点のそれぞれについての前記干渉データを前記試験面及び前記基準面の前記対応する点の間の前記高さ変化の尺度に変換するための手続きに組み入れるプロセッサ、
を備えることを特徴とする装置。 - (a)前記周波数偏移干渉計が、公称測定ビーム周波数モード間の周波数間隔に相当する自由スペクトルレンジを有するレーザ発振振器を備える周波数可変レーザを有し、
(b)前記距離偏移干渉計が、前記周波数偏移干渉計の前記ビーム周波数変化を測定するための前記レーザ発振共振器の前記自由スペクトルレンジに関係付けられる自由スペクトルレンジを有する測定キャビティを有する、
ことを特徴とする請求項8に記載の装置。 - (a)前記測定キャビティが前記基準面間に形成され、前記2つの基準面が前記複数の対応する点にわたって互いに相対的に傾けられ、
(b)前記複数の対応する点が前記測定ビーム周波数のそれぞれについて前記距離偏移干渉計によって形成された干渉パターンの少なくとも1つの干渉縞にほぼ等しい範囲の高さ変化にわたって互いに対して変化する、
ことを特徴とする請求項9に記載の装置。 - 前記プロセッサが、前記周波数のそれぞれについての前記干渉データをビーム強度変化の尺度に変換し、前記ビーム強度変化の前記尺度を、前記点のそれぞれについての前記干渉データを前記試験面及び前記基準面の前記対応する点の間の前記高さ変化の尺度に変換するための前記手続きに組み入れることを特徴とする請求項8に記載の装置。
- 前記周波数偏移干渉計の測定ビームを前記周波数偏移干渉計の前記試験面と前記基準表面の間で干渉パターンを形成する第1ビーム及び前記距離偏移干渉計の前記基準面の間で干渉パターンを形成する第2ビームに分けるビームスプリッタをさらに備えることを特徴とする請求項8に記載の装置。
Applications Claiming Priority (3)
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US10/946,691 | 2004-09-22 | ||
US10/946,691 US7259860B2 (en) | 2004-09-22 | 2004-09-22 | Optical feedback from mode-selective tuner |
PCT/US2005/033909 WO2006036717A2 (en) | 2004-09-22 | 2005-09-20 | Optical feedback from mode-selective tuner |
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JP2008513804A true JP2008513804A (ja) | 2008-05-01 |
JP5265918B2 JP5265918B2 (ja) | 2013-08-14 |
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JP2007533614A Expired - Fee Related JP5265918B2 (ja) | 2004-09-22 | 2005-09-20 | モード選択同調器からの光フィードバック |
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US (1) | US7259860B2 (ja) |
EP (1) | EP1794852B1 (ja) |
JP (1) | JP5265918B2 (ja) |
KR (1) | KR101177592B1 (ja) |
CN (1) | CN101023567B (ja) |
WO (1) | WO2006036717A2 (ja) |
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- 2005-09-20 KR KR1020077009116A patent/KR101177592B1/ko active IP Right Grant
- 2005-09-20 CN CN2005800315284A patent/CN101023567B/zh not_active Expired - Fee Related
- 2005-09-20 EP EP05798916.2A patent/EP1794852B1/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP1794852B1 (en) | 2018-09-05 |
CN101023567A (zh) | 2007-08-22 |
EP1794852A4 (en) | 2010-05-05 |
KR101177592B1 (ko) | 2012-08-27 |
WO2006036717A2 (en) | 2006-04-06 |
KR20070062572A (ko) | 2007-06-15 |
WO2006036717A3 (en) | 2007-01-25 |
US20060062260A1 (en) | 2006-03-23 |
EP1794852A2 (en) | 2007-06-13 |
JP5265918B2 (ja) | 2013-08-14 |
CN101023567B (zh) | 2010-06-09 |
US7259860B2 (en) | 2007-08-21 |
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