JP6134773B2 - 光共振装置及び共振器において一周時間を調節する方法 - Google Patents
光共振装置及び共振器において一周時間を調節する方法 Download PDFInfo
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Description
fm=m×frep+f0 (1)
2 共振器
8 放射線
9 干渉計
9a 第1干渉計レッグ
9b 第2干渉計レッグ
L1 第1光路長
L2 第2光路長
Claims (25)
- 共振器(2)を有する光共振装置(1)であって、
少なくとも第1及び第2干渉計レッグ(9a,9b)を有する干渉計(9)が、前記共振器(2)内に配置され、
前記第1干渉計レッグ(9a)は第1光路長(L1)を有し、前記第2干渉計レッグ(9b)は前記第1光路長(L1)と異なる第2光路長(L2)を有し、
前記干渉計(9)が、前記共振器(2)内を循環する放射線(8)を前記第1及び第2干渉計レッグ(9a,9b)に分割する分割比が、可変に調節可能であり、
さらに前記光共振装置(1)は、前記第1及び第2干渉計レッグ(9a,9b)のための前記共振器(2)内を循環する前記放射線(8)の前記分割比を変更することで、前記共振器(2)の繰り返し率及び搬送エンベロープオフセット周波数(f 0 )を変更するように構成されており、それにより周波数領域では、前記共振器内を循環する前記放射線(8)の周波数(f m )のコムが固定点(f fix )の周りでアコーディオンのように広がり又は収縮する、光共振装置。 - 前記光共振装置(1)は前記分割比を調節するためのアクチュエーター(15)を有し、前記アクチュエーター(15)は好ましくは、少なくとも10kHz、少なくとも100kHz又は少なくとも1000kHzの制御バンド幅を有する、請求項1に記載の光共振装置。
- 前記光共振装置(1)は、前記アクチュエーター(15)で得られる共振線のシフトを測定するように構成された測定装置(11)を有する、請求項2に記載の光共振装置。
- 前記光共振装置(1)は、前記共振器(2)の繰り返し率(f rep )と前記共振器(2)で発生される又は受信される周波数コムの搬送エンベロープオフセット周波数(f 0 )の少なくとも1つを測定するように構成された測定装置(11)を有する、請求項2に記載の光共振装置。
- 前記干渉計(9)は、偏光依存伝播時間シフトと位相シフトの少なくとも1つを有する少なくとも1つの光学素子(33,34,35)を有し、又はこのような素子(33,34,35)により実現される、請求項1〜4のいずれか一項に記載の光共振装置。
- 前記少なくとも1つの光学素子(33,34,35)が複屈折光学素子である、請求項5に記載の光共振装置。
- 前記少なくとも1つの光学素子(33,34,35)が、2πの整数倍又は半整数倍の位相シフトを生じる、請求項5又は6に記載の光共振装置。
- 前記少なくとも1つの光学素子(33,34,35)が、目標波長(λz)のための整数又は半整数波長板(33,34,35)である、請求項5又は6に記載の光共振装置。
- 前記干渉計(9)は、以下の光学素子、すなわち偏光フィルター(36,37)、偏光調節器、λ板、n≧2を有するnλ板、λ/2板、λ/4板、電気光学変調器(40)、可変に調節可能な液晶(40)の1又は複数を含む、請求項1〜8のいずれか一項に記載の光共振装置。
- 偏光依存位相シフトを有する少なくとも2つの光学素子(34,35)が前記共振器(2)に存在し、前記第1及び第2干渉計レッグ(9a,9b)のための前記共振器(2)内を循環する前記放射線(8)の分割比が、前記2つの光学素子(34,35)の向きを互いに調節することにより及び/又は前記2つの光学素子(34,35)を通過する放射線の偏光に異なって影響を与えることにより、調節可能である、請求項5〜9のいずれか一項に記載の光共振装置。
- 前記共振器(2)内に、前記共振器(2)内を循環する前記放射線(8)のためにレーザー媒体(7)又は増幅器媒体(7)及び/又はモード結合素子(M,17)が配置され、前記レーザー媒体及び前記増幅器媒体はそれぞれポンピングされるように構成される、請求項1〜10のいずれか一項に記載の光共振装置。
- 前記第1及び第2干渉計レッグ(9a,9b)ための前記放射線(8)の分割比の変更の際、そこを循環する前記放射線(8)のための前記共振器(2)の透過率が、一定又は実質的に一定である、請求項1〜11のいずれか一項に記載の光共振装置。
- 前記共振器のモード間隔が前記共振器に入射する放射線のモード間隔の整数倍である、又は前記共振器のモード間隔と入射放射線が有理比によって互いに関連付けられる、請求項1〜12のいずれか一項に記載の光共振装置。
- 前記光共振装置(1)が、光放射(111)をフィルターにかける及び/又は増幅するように構成され、非線形光学素子(45)が前記光共振装置(1)の前記共振器(2)内に配置され、前記非線形光学素子(45)は、前記共振器内を循環する放射線(110)の第二高調波又はより高調波を生成するように、和周波発生及び差周波発生によって放射線を生成するように、又は光パラメトリックプロセスにより放射線を生成若しくは増幅するように、選択される、請求項1〜13のいずれか一項に記載の光共振装置。
- 前記非線形光学素子(45)はガスジェット又は結晶である、請求項14に記載の光共振装置。
- 請求項1〜15のいずれか一項に記載の光共振装置(1)を有する、ファイバーレーザー(1)、周波数コムジェネレータ(1)、モード結合素子(M,17)を有する能動若しくは受動モード結合レーザー(1)、又はインジェクション安定化レーザー(1)。
- 共振器(2)の繰り返し率(frep)又は共振器(2)内を循環する放射線(8)又はパルス(110)の一周時間(τ)を調節する方法であって、
前記共振器(2)内に位置する干渉計(9)によって、前記共振器(2)内を循環する前記放射線(8)又はパルス(110)を、第1光路長(L1)を有する第1干渉計レッグ(9a)を通過する第1パルス部分(8a)と、第2光路長(L2)を有する第2干渉計レッグ(9b)を通過する第2パルス部分(8b)とに分割し、
前記第1及び第2パルス部分(8a,8b)を、前記干渉計(9)を通過後に互いに干渉させ、
さらに、前記干渉計(9)が前記共振器(2)内を循環する前記放射線(8)又はパルス(110)を前記第1及び第2パルス部分(8a,8b)に分割する分割比を変更し、
さらに前記第1及び第2干渉計レッグ(9a,9b)のための前記共振器(2)内を循環する前記放射線(8)又はパルス(110)の前記分割比を変更することで、前記共振器(2)の繰り返し率及びは搬送エンベロープオフセット周波数(f 0 )が変更され、それにより周波数領域では、前記共振器内を循環する前記放射線(8)又はパルス(110)の周波数(f m )のコムが固定点(f fix )の周りでアコーディオンのように広がり又は収縮する、方法。 - 前記分割比を変更する際に、前記共振器(2)内を循環する前記放射線(8)又はパルス(110)の群一周時間(τ)が、前記共振器(2)内の搬送波(120)の位相一周時間を変えることなく変更される、請求項17に記載の方法。
- 前記干渉計(9)が前記共振器(2)内を循環する前記放射線(8)又はパルス(110)を前記第1及び第2パルス部分(8a,8b)に分割する分割比を変更するときに、前記共振器(2)内を循環する前記放射線(8)又はパルス(110)の一周ロスが変わらない又は実質的に変わらない、請求項17又は18に記載の方法。
- 前記放射線(8)又はパルス(110)が搬送波(120)である、請求項19に記載の方法。
- 前記干渉計(9)が、偏光依存位相シフトを有する少なくとも1つの光学素子を有し、前記干渉計(9)が前記共振器(2)内を循環する前記放射線(8)又はパルス(110)を前記第1及び第2パルス部分(8a,8b)に分割する分割比が、前記共振器(2)の光軸の周りに前記光学素子を回転させることで、又はこの光学素子にて偏光を変えることで、変更される、請求項17〜20のいずれか一項に記載の方法。
- 前記少なくとも1つの光学素子が複屈折素子である、請求項21に記載の方法。
- 前記光学素子が、所与の目標波長(λz)に対してm・0.5・πの偏光依存位相シフトを生じさせ、mは整数である、請求項21又は22に記載の方法。
- mが偶数である、請求項23に記載の方法。
- 前記共振器(2)内を循環する前記放射線(8)又はパルス(110)が前記第1及び第2パルス部分(8a,8b)に分割される分割比の変更は、前記干渉計(9)の入口にて前記放射線(8)又は前記パルス(110)の偏光依存位相及び/又は偏光角を変更することで達成される、請求項17〜24のいずれか一項に記載の方法。
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