JP2020144367A - 光周波数コムアセンブリ及び方法 - Google Patents
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Abstract
Description
図3及び4に示す実施形態によれば、基準位置Rと分岐光路7のそれぞれの測定位置Pの間で第1周波数モードv1での位相差の決定は、基準光と前記基準位置Rで分岐されるレーザー光の間のビート信号、及び、前記基準光と前記測定位置Pで分岐されるレーザー光の間のビート信号の測定を有する(である)。
3 光周波数コムソース
5 共通の光路
P 測定位置
R 基準位置
Claims (15)
- 光周波数コムアセンブリ(1)を操作する方法であって、
光周波数コムを構成するレーザー光を生成するために光周波数コムソース(3)を操作し、レーザー光を共通の光路(5)に導入し、
少なくとも1つの光学素子(11,13)を有する少なくとも1つの分岐光路(7)に、前記共通の光路(5)からのレーザー光を導入し、
前記少なくとも1つの光学素子(11,13)の上流の前記周波数コムアセンブリ(1)内の基準位置(R)で分離されるレーザー光と、前記少なくとも1つの光学素子(11,13)の下流の前記少なくとも1つの分岐光路(7)に設けられた測定位置(P)で分離されるレーザー光の間の前記光周波数コムの第1周波数モードv1の位相差を決定し、
決定された前記位相差の目標値からの偏差に基づき前記少なくとも1つの分岐光路(7)からのレーザー光のために位相補正を与える、方法。 - 前記基準位置(R)は、多数の分岐光路(7)のための前記位相差の決定のために同じである、請求項1に記載の方法。
- 前記基準位置(R)で分離されるレーザー光と前記測定位置(P)で分離されるレーザー光の間の前記第1周波数モードv1の前記位相差の決定は、基準光と前記基準位置(R)で分離されるレーザー光の間のビート信号、及び/又は、前記基準光と前記測定位置(P)で分離されるレーザー光の間のビート信号の測定を有する、請求項1又は2に記載の方法。
- 前記基準光は連続波(CW)レーザー光である、請求項3に記載の方法。
- 前記基準光は、前記光周波数コムソース(3)により前記共通の光路(5)に供給される前記光周波数コムから得られ、前記基準光は、特に、レーザー光を周波数シフタ(27)に与えることで、及び、前記共通の光路(5)からのレーザー光の周波数フィルタリングを実行することで生成される、請求項3に記載の方法。
- 前記少なくとも1つの光学素子(11,13)は、χ(2)プロセス及び/又はχ(3)プロセスを、前記少なくとも1つの光学素子(11,13)を通るレーザー光に誘起するように、及び/又は、前記少なくとも1つの光学素子(11,13)を通るレーザー光を増幅するように構成され、前記少なくとも1つの光学素子(11,13)は特に、非線形周波数ブローデナー(13)を有する、請求項1〜5のいずれか一項に記載の方法。
- 前記光周波数コムソース(3)はそれ自体、前記周波数コムのオフセット周波数f0及び/又は繰り返し周波数frepに関して安定化される、請求項1〜6のいずれか一項に記載の方法。
- 前記位相補正は、少なくとも1つのアクチュエータ(19)を、特に1又は複数の位相同期ループを介して操作することで、前記少なくとも1つの分岐光路(7)の光学特性、特に群遅延及び/又は位相遅延を変更することを含み、
前記少なくとも1つのアクチュエータ(19)は好ましくは、温度変更アセンブリ、ファイバースクイーザ、ファイバーストレッチャー、特にピエゾドラム、調節可能な長さを有する自由空間光路セクション、電気光学装置又は音響光学装置の1又は複数を有する、請求項1〜7のいずれか一項に記載の方法。 - 前記位相補正は、データの後処理又はフィードフォワードスキームを有する、請求項1〜8のいずれか一項に記載の方法。
- 前記少なくとも1つの分岐光路(7)のために、前記第1周波数モードv1とは異なる第2周波数モードv2が、前記分岐光路(7)によって光を供給されるアプリケーションにおいて使用される、請求項1〜9のいずれか一項に記載の方法。
- 前記位相補正は周波数変換ステップを有し、それにより前記位相補正は、前記アプリケーションにより使用される前記第2周波数モードv2での補正、特に最適補正を与えるが、前記位相補正は、前記第1周波数モードv1で決定された前記位相差を使用する、請求項10に記載の方法。
- 前記少なくとも1つの分岐光路(7)を通って延びるレーザー光の周波数と、前記基準位置(R)で分離されるレーザー光の部分と前記測定位置(P)で分離されるレーザー光の別な部分の間の位相差との関係を特徴付ける基準測定、特に、前記第1周波数モードv1及び第2周波数モードv2でのレーザー光のために前記少なくとも1つの分岐光路(7)における位相遅延の比を特徴付ける基準測定を実行することをさらに有する、請求項1〜11のいずれか一項に記載の方法。
- 前記周波数変換ステップは、前記周波数コム(8)の2つの異なる周波数モードvref,A、vref,Bでの、特に前記第1周波数モードv1及び基準周波数モードv1bでの、前記基準位置(R)で分離されるレーザー光の部分と前記測定位置(P)で分離されるレーザー光の別な部分の間の位相差の決定を有する、請求項11に記載の方法。
- 分離後であって前記位相差の決定のために使用される前に、前記基準位置(R)で分離される光及び分岐光路(7)の対応する前記測定位置(P)で分離される光は、せいぜい20cm、好ましくはせいぜい10cm、より好ましくはせいぜい1cm、さらにより好ましくはせいぜい0.1cm進む、請求項1〜13のいずれか一項に記載の方法。
- 光周波数コムアセンブリ(1)であって、
共通の光路(5)と、
光周波数コムを構成するレーザー光を生成するように構成され、レーザー光を前記共通の光路(5)に導入する光周波数コムソース(3)と、
少なくとも1つの光学素子(11,13)を有し、前記共通の光路(5)からのレーザー光を導入される少なくとも1つの分岐光路(7)と、
前記少なくとも1つの光学素子(11,13)の上流の前記周波数コムアセンブリ(1)内の基準位置(R)で分離されるレーザー光と、前記少なくとも1つの光学素子(11,13)の下流の前記少なくとも1つの分岐光路(7)に設けられた測定位置(P)で分離されるレーザー光の間の前記光周波数コムの第1周波数モードv1の位相差を決定するように構成された位相測定アセンブリ(15)と、
決定された前記位相差の目標値からの偏差に基づき前記少なくとも1つの分岐光路(7)からのレーザー光のための位相補正を与えるように構成された制御ユニット(17)と、を有する光周波数コムアセンブリ(1)。
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