JP2007527522A - レーザ出力の帯域幅を測定する方法及び装置 - Google Patents
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Abstract
【解決手段】レーザから放射された光の帯域幅を測定する方法及び装置。本発明は、第1及び第2帯域幅検出器によってそれぞれ測定される時の放射された光の帯域幅を示す第1パラメータを表す出力をそれぞれ提供する第1及び第2波長感知光学帯域幅検出器と、第1又は第2帯域幅検出器のいずれかに特定の所定の較正変数を用いる多変数線形方程式の一部としてこれらの2つの出力を利用して第1の実帯域幅パラメータ又は第2の実帯域幅パラメータを計算するようになった実帯域幅計算装置とを含むことができる。第1の実帯域幅パラメータは、最大値のいくらかのパーセントでのスペクトル全幅(FWXM)とすることができ、第2の実帯域幅パラメータは、エネルギのいくらかのパーセントを含む部分(EX)とすることができる。第1及び第2帯域幅検出器は、エタロンとすることができ、出力は、FWXMでのそれぞれのエタロンの光出力のフリンジのフリンジ幅を表すものとすることができる。事前に計算された較正変数は、第1及び第2の実帯域幅パラメータの既知の値を有する較正入力光に関連して検出器出力をそれぞれ表すそれぞれの三次元プロットから導出することができる。
【選択図】図4
Description
本出願は、本出願の出願人に譲渡された本出願と同日出願の「レーザの光出力の帯域幅を測定する方法及び装置」という名称の出願(代理人整理番号2003−0056−01)に関連しており、その開示は、本明細書において引用により組み込まれる。
本発明は、非常に狭い帯域幅、例えば、ピコメートルの100分のいくつか及びそれよりも小さな許容誤差を有するサブピコメートル帯域幅で光を発するレーザのためのレーザ放射光帯域幅の検出に関する。より具体的には、本発明は、例えばインパルス応答関数が測定されている光源にほぼ同等か又はそれよりも大きい帯域幅を有する干渉計器又は分散計器(分光計)を使用して光源の帯域幅を正確に推定することに関する。
例えば分散光学要素又は光学干渉現象に基づく帯域幅検出器(波長計)、例えば分光計は、光源の絶対波長及び帯域幅の測定に一般的に適用される公知の計器である。帯域幅測定ツール(帯域幅検出器/メーター)として用いられる場合には、測定されている光源の帯域幅を判断する時に、分光計の有限インパルス応答の影響を考慮すべきである。本出願の目的に対して、「帯域幅」は、半値強度でのスペクトルの全幅(FWHM)、最大値のいくらかの他のパーセントでの全幅(FWXM)、95%封入強度積分の幅(「I95%」又は「E95%」)、又はスペクトル部分に封入されたエネルギのいくらかの他のパーセントの幅(「IX%」又は「EX%」)などのようなあらゆる数の測定基準又は数学的構成の意味することができる。光源の帯域幅の正確な知識は、多くの学術的及び産業的応用、例えば、液体又は気体の分光法、半導体フォトリソグラフィでの限界寸法制御などにおいて非常に重要である。
従来技術のERを使用するエタロン波長計は、E95及びFWHMの両方に対して両方ともピコメートルにおいて大体同じ応答を示すことが分る。図示の相関格子応答は、「Levenburg Marquardt」多変数最小化アルゴリズムのようないくつかの公知の当て嵌め技術のいずれかによって平滑化される場合に、応答関数A*x+B*y+Cを示し、ここで、A=0.64495±0.0166、B=0.20797±0.01105、及びC=0.22983±0.00719であり、従来技術では、FWHMの変化を表すA項といくらかの一定オフセットを表すC項とは、製造時の較正処理中に工場であらゆる所定の波長計に対してERを設定するのに利用される。B項は、完全には無視されないが、平均化されて定数Cに組み込まれる。
(第1出力、例えば、エタロン1フリンジ幅値)=(a*(スペクトルの全幅内の最大値のいくらかのパーセントでの全幅の較正入力光既知値、例えば、FWXM))+(b*(全スペクトルのエネルギのいくらかのパーセントを包含するスペクトルのコンテントを定めるスペクトル上の2つのポイント間の幅の較正入力光既知値、例えば、EX)+c、及び
(第2出力、例えば、エタロン2フリンジ幅値)=(a*(スペクトルの全幅内の最大値のいくらかのパーセントでの全幅の較正入力光既知値、例えば、FWXM))+(b*(全スペクトルのエネルギのいくらかのパーセントを包含するスペクトルのコンテントを定めるスペクトル上の2つのポイント間の幅の較正入力光既知値、例えば、EX))+c、
におけるD、E、及びFとして上述した、A、B、及びCの第2の値を使用すると、実帯域幅計算装置は、導出された式:
(第1の実帯域幅パラメータ、例えば、FWXM)=((b*(第2出力、例えば、エタロン2フリンジ幅値))−(e*(第1出力、例えば、エタロン1フリンジ幅値))+ce−bf)/(bd−ae)、又は、方程式:
(第2の実帯域幅パラメータ、例えば、EX)=((a*(第2出力、例えば、エタロン2フリンジ幅値))−(d*(第1出力、例えば、エタロン1フリンジ幅値))+cd−af)/(ae−bd)、
を解くようにプログラムすることができることを発見した。
FWHM=(b*X’−e*X+ce−bf)/(bd−ae)、及び
E95=(a*X’−d*X+cd−af)/(ae−bd)
この種の較正は、同じか又は類似の種類の周波数依存の応答問題を受けやすい他の帯域幅測定計器と共に用いることができることが理解されるであろう。
正規化フリンジ−幅超過=(FWHMフリンジ−FWHM応答関数)/(これらの差の最も大きいもの)
16 ビームスプリッタ
20 第2ビームスプリッタ
22 反射ビーム
24 通過ビーム
Claims (1)
- レーザから放射されて入力された光のスペクトルの帯域幅を測定するための帯域幅メーターであって、
帯域幅検出器によって実際に測定される時にレーザから放射された光の帯域幅を示すパラメータを表す第1出力を提供する第1光学帯域幅検出器と、
帯域幅検出器によって実際に測定される時にレーザから放射された光の帯域幅を示すパラメータを表す第2出力を提供する第2光学帯域幅検出器と、
前記第1帯域幅検出器又は前記第2帯域幅検出器のいずれかに特定の所定の較正変数を用いる多変数線形方程式の一部として前記第1出力及び前記第2出力を利用し、実帯域幅パラメータを計算するようになった実帯域幅計算装置と、
を含むことを特徴とする帯域幅メーター。
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US10/615,321 US6952267B2 (en) | 2003-07-07 | 2003-07-07 | Method and apparatus for measuring bandwidth of a laser output |
US10/615,321 | 2003-07-07 | ||
PCT/US2004/021259 WO2005008295A2 (en) | 2003-07-07 | 2004-06-29 | Optical bandwidth meter for very narrow bandwidth laser emitted light |
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JP4994031B2 JP4994031B2 (ja) | 2012-08-08 |
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JP (1) | JP4994031B2 (ja) |
KR (1) | KR101084016B1 (ja) |
CN (1) | CN100538258C (ja) |
TW (1) | TWI294961B (ja) |
WO (1) | WO2005008295A2 (ja) |
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JPH0219726A (ja) * | 1988-07-07 | 1990-01-23 | Kishiyouchiyou Chokan | ファブリーペロー干渉計を用いた広波長域同時測定型分光器 |
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CN1820178A (zh) | 2006-08-16 |
TWI294961B (en) | 2008-03-21 |
TW200504340A (en) | 2005-02-01 |
KR101084016B1 (ko) | 2011-11-16 |
WO2005008295A2 (en) | 2005-01-27 |
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US20050007600A1 (en) | 2005-01-13 |
KR20060052783A (ko) | 2006-05-19 |
EP1649244A4 (en) | 2009-08-26 |
US6952267B2 (en) | 2005-10-04 |
CN100538258C (zh) | 2009-09-09 |
WO2005008295A3 (en) | 2005-05-12 |
JP4994031B2 (ja) | 2012-08-08 |
EP1649244B1 (en) | 2014-10-22 |
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