JP2018142699A - 時間的タルボ効果を利用したレーザ・パルスの生成および分光法 - Google Patents
時間的タルボ効果を利用したレーザ・パルスの生成および分光法 Download PDFInfo
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Abstract
【解決手段】共振器長Lとキャビティ内分散を有し循環光場の複数の共振器モードを支援するよう構成される共振器装置に循環光場を形成する工程と、モード同期機構によって、搬送波周波数ω0と周波数空間に複数のコーム・モードとを有する周波数コームを形成し繰返し周波数で生成されるレーザ・パルスのパルス列を生成する工程とを含む。キャビティ内分散は、往復位相φが次式に従う周波数ω依存性を有するよう選択される。[数8]
ここで、mは光搬送波周波数(ω0)でモード間隔ωrとの組合せで有効繰返し率(mωr)を与える整数である。モード同期機構は、隣接のモード周波数(ωn,ωn+1)間の周波数差(Δn=ωn+1−ωn)が整数モード周波数番号nの線形関数であるように、共振器モードの結合を形成する。
【選択図】なし
Description
[2]M. Hofer et al., "Opt. Lett." 16, 502 (1991)
[3]T. Ideguchi et al., "Nat. Commun." 5, 3375 (2014)
[4]B. Bernhardt et al., "Nature photonics" 4, 55 (2010)
[5]S. Teng et al., "Opt. Commun." 315, 103 (2014)
[6]J. Azana et al., "Appl. Opt." 38, 6700 (1999)
[7]T. Suzuki et al, "Opt. Expr." 18, 23088 (2010)
これらの目的は、独立請求項の特徴をそれぞれ含む、レーザ・パルスのパルス列を生成する方法、分光法、レーザ・パルス源装置および分光装置によって、達成(解決)される。本発明の好ましい実施形態および適用例は、従属請求項に記載されている。
自己参照のために、タルボ周波数コームの2つのパラメータωrおよびω0を測定して理想的に安定化させる必要がある。再帰指数(recurrence index:リカレンス・インデックス)mは、既知であると仮定される。再帰時間を測定して(これを)キャビティ長と比較することによって、その推定値を取得してそれ(推定値)を整数に設定してもよいであろう。より信頼性の高い方法は、自己参照されたタルボ周波数コームで既知の光周波数を測定し、次いでその測定(値)に適合する適正なmを特定することであろう。これは、正しいモード番号(数)を決定するために、通常の周波数コームでしばしば適用されるのと同じ方法である。
Claims (16)
- レーザ・パルス(1)を生成する方法であって、
− 共振器装置(11)において循環光場を形成する工程であって、前記共振器装置が、共振器長Lおよびキャビティ内分散を有し、前記光場の複数の共振器モードを支援するよう構成される、工程と、
− モード同期機構によって前記レーザ・パルス(1)のパルス列を生成する工程であって、前記レーザ・パルス(1)が、搬送波周波数ω0と、周波数空間に複数のコーム・モードとを有する周波数コームを形成する、工程と、
を含み、
特徴として、
− 前記キャビティ内分散は、往復位相φが次式に従う周波数ωに対する依存性を有するように選択され、
− 前記モード同期機構は、隣接のモード周波数(ωn,ωn+1)間の周波数差(Δn=ωn+1−ωn)が整数モード周波数番号nの線形関数であるように、前記共振器モードの結合を形成するものである、
方法。 - 前記モード周波数番号nを有するモード周波数(ωn)が次式で与えられる、
- 前記キャビティ内分散が、前記搬送波周波数(ω0)におけるコーム・モード位相のk次導関数が次式で与えられるように選択され、
請求項2に記載の方法。 - 隣接のコーム周波数間の周波数差(Δn=ωn+1−ωn)が無線周波数範囲にある、請求項1乃至3のいずれかに記載の方法。
- 前記共振器装置(11)に含まれる、少なくとも1つのファイバ・ブラッグ格子、少なくとも1つのキャビティ内プリズムおよび/または少なくとも1つのキャビティ内格子を用いて、前記キャビティ内分散が設定される、請求項1乃至4のいずれかに記載の方法。
- 前記共振器装置(11)がファイバ・リング・レーザである、請求項1乃至5のいずれかに記載の方法。
- 試料のスペクトル応答を得るための分光法であって、
− 請求項1乃至6のいずれかに記載の方法を用いてレーザ・パルス(1)のパルス列を生成する工程と、
− 調査中の前記試料(3)にレーザ・パルス(1)を当てる工程と、
− 検出器装置を用いて前記レーザ・パルス(1)を検出する工程と、
− 前記レーザ・パルス(1)のパルス列のコーム・モードによって形成されるビート信号を得るために、前記検出器装置の検出器信号を分析する工程と、
− 前記ビート信号から前記試料(3)の前記スペクトル応答を決定する工程と、
を含む、分光法。 - − 前記試料(3)に当てることなく、前記検出器装置を用いて前記レーザ・パルス(1)の前記パルス列の参照部分を検出する工程と、
− 前記レーザ・パルス(1)の前記パルス列の前記参照部分の前記コーム・モードによって形成される参照ビート信号を得るために、前記検出器装置の参照検出器信号を分析する工程と、
を含み、
− 前記試料(3)の前記スペクトル応答が、前記ビート信号および前記参照ビート信号から決定されるものである、
請求項7に記載の分光法。 - 前記検出器装置が少なくとも1つのフォトダイオードを含む、請求項7または8に記載の分光法。
- レーザ・パルス(1)を生成するよう構成されたレーザ・パルス源装置(10)であって、
− 共振器長Lおよびキャビティ内分散を有し、循環光場の複数の共振器モードを支援するよう構成された共振器装置(11)と、
− 搬送波周波数ω0と周波数空間に複数のコーム・モードとを有する周波数コームを形成する前記レーザ・パルス(1)を生成するよう配置されたモード同期機構と、
を含み、
特徴として、
− キャビティ内群速度分散は、往復位相φが次式に従う周波数ωに対する依存性を有するように選択され、
− 前記モード同期機構は、隣接のモード周波数(ωn,ωn+1)間の周波数差(Δn=ωn+1−ωn)が整数モード周波数番号nの線形関数であるように、前記共振器モードの結合を形成するよう配置されるものである、
レーザ・パルス源装置。 - − 前記モード周波数番号nを有する前記モード周波数(ωn)が次式で与えられる、
− 隣接のコーム周波数(Δn=ωn+1−ωn)の間の周波数差が無線周波数範囲に含まれる、
という特徴の中の少なくとも1つの特徴を有する、請求項10に記載のレーザ・パルス源装置。 - 前記共振器装置(11)は、前記キャビティ内分散を設定するために配置された、少なくとも1つのファイバ・ブラッグ格子、少なくとも1つのキャビティ内プリズムおよび/または少なくとも1つのキャビティ内格子を含むものである、請求項10または11に記載のレーザ・パルス源装置。
- 前記共振器装置(11)がファイバ・リング・レーザである、請求項10または11に記載のレーザ・パルス源装置。
- 調査中の試料(3)のスペクトル応答を得るよう構成された分光装置(20)であって、
− 請求項10乃至13のいずれかに記載のレーザ・パルス源装置(10)と、
− 前記試料(3)を収容し前記試料(3)にレーザ・パルス(1)を当てるよう適合化された試料ホルダ(21)と、
− 前記レーザ・パルス(1)を検出するよう適合化された検出器装置(22)と、
− 前記レーザ・パルス(1)のパルス列のコーム・モードによって形成されるビート信号を得るために、前記検出器装置(22)の検出器信号を分析するよう適合化されたスペクトル分析器装置(23)と、
− 前記ビート信号から前記試料(3)の前記スペクトル応答を決定するよう適合化された計算装置(24)と、
を含む、分光装置。 - − 前記試料(3)に当てることなく、前記レーザ・パルス(1)の参照部分を前記検出器装置(220)に方向付けるよう配置されたビーム分割装置(25)を含み、
− 前記スペクトル分析装置(23)は、前記検出器装置(22)の参照検出器信号を分析し前記レーザ・パルス(1)の前記パルス列の前記参照部分の前記コーム・モードによって形成される参照ビート信号を得るよう適合化され、
− 前記計算装置(24)は、前記ビート信号および前記参照ビート信号から前記試料(3)の前記スペクトル応答を決定するよう適合化されるものである、
請求項14に記載の分光装置。 - 前記検出器装置(22)が少なくとも1つのフォトダイオードを含む、請求項14または15に記載の分光装置。
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