JP2020516961A - 多結晶媒質中のランダム位相整合に基づいた光パラメトリックデバイス - Google Patents
多結晶媒質中のランダム位相整合に基づいた光パラメトリックデバイス Download PDFInfo
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Abstract
Description
12 光ポンプ、ポンプレーザ、パルス光学ポンプ
14 光学構成要素
16 光学構成要素
18 光学構成要素
20 HR鏡
22 くさび
24 光学構成要素
25 非線形光学要素、NOE、OPD、NOE結晶、準備試料
26 出力信号放射およびアイドラー放射、MIR 出力
30 共振空洞、共振器
32 入力カプラ
34 出力カプラ
36 OPO共振器、CWポンプ
38 ポンプ共振器
40 出力カプラ
42 入力カプラ
44 共振空洞
46 高反射周波数弁別器
48 低反射率周波数弁別器
50 モノリシック媒質
52 サーボシステム
55 設定
65 ヒストグラム
70 ホットスポット
Claims (22)
- 光パラメトリック発振器(OPO)または光パラメトリック発生器(OPG)から選択される光パラメトリックデバイス(OPD)であって、ランダム擬似位相整合プロセス(RQPM−NOE)を用いた非線形相互作用を利用することによって、第1の周波数におけるインカップルされたポンプ放射を、前記第1の周波数より低い、少なくとも1つの第2の周波数で出力信号放射およびアイドラー放射へと変換するように構成される非線形光学要素(NOE)を備える、光パラメトリックデバイス(OPD)。
- 前記第1の周波数で前記ポンプ放射を出力し、連続波(CW)体制またはナノ秒(ns)、ピコ秒(ps)、もしくはフェムト秒(fs)パルス持続期間を有するパルス体制で動作するポンプレーザをさらに備える、請求項1に記載のOPD。
- 前記ポンプレーザが、fsおよびpsパルスを出力するモードロックレーザである、請求項1または2に記載のOPD。
- 前記ポンプレーザが光学的周波数コムを生成するように構成される、請求項2または3に記載のOPD。
- 前記NOEが同期ポンピングされる、請求項1から4のいずれか一項に記載のOPD。
- 前記同期ポンピングを維持するように動作可能なサーボ制御システムをさらに備える、請求項5に記載のOPD。
- Cr2+およびFe2+をドープした、単結晶または多結晶の形態中の2元化合物(たとえば、ZnSe、ZnS、CdSe)、または
ZnMgSeもしくはCdMnTeを含む単結晶もしくは多結晶の形態中の3元化合物もしくは4元化合物
からなるグループから選択されるTM: II−VI材料から作られる利得要素に前記ポンプレーザが基づく、請求項1から6のいずれか一項に記載のOPD。 - 前記ポンプレーザが利得要素を受け入れる共振空洞を有して構成され、前記NOEが、
前記ポンプレーザの前記共振空洞の外側、
前記ポンプレーザの前記共振空洞の内側だが前記共振空洞から離間して、または、
前記ポンプレーザの前記共振空洞の内側、
に配置され、前記ポンプレーザの前記利得要素とNOEが、モノリシック部片の中で一緒に組み合わされて、これがパラメトリック増幅およびレーザ放出を実現する、請求項1から7のいずれか一項に記載のOPD。 - 前記OPOが、前記NOEを囲み、前記OPOの光共振器を画定する複数の光学構成要素で構成される、請求項1に記載のOPD。
- 前記OPOまたはOPGが縮退付近で動作するように構成され、前記第2の周波数で前記出力信号放射とアイドラー放射が実質的に等しい、請求項1に記載のOPD。
- 前記OPOが、単一、2重、または3重共振OPOとして構成される、請求項1に記載のOPD。
- 前記OPOが、前記NOE中に完全に組み込まれるマイクロ共振器で構成される、請求項1に記載のOPD。
- 前記OPGが、前記ポンプ放射を前記NOEへと結合するように動作可能な少なくとも1つの入力カプラと、前記NOEから前記出力信号放射およびアイドラー放射を分離するように動作可能な少なくとも1つの出力カプラとを含み、前記入力カプラと出力カプラのうちの少なくとも1つがダイクロイックミラーまたはくさびまたは板であって、ARまたは鏡面コーティングを任意選択で備える、請求項1に記載のOPD。
- 前記OPOの光学構成要素のうちの少なくとも1つが前記ポンプ放射を光共振器へとインカップルするように動作可能な入力カプラであり、少なくとも1つの別の光学構成要素が前記出力信号放射およびアイドラー放射を前記光共振器から分離するように動作可能な出力カプラであり、前記入力カプラと出力カプラのうちの少なくとも1つまたは両方がダイクロイックミラーまたは板またはくさびであって、ARまたは鏡面コーティングを備えるまたは備えない、請求項1に記載のOPD。
- RQPMプロセスを用いた非線形相互作用を利用して、インカップルされたポンプ放射を出力信号放射およびアイドラー放射へと変換する光パラメトリックデバイス中で使用される非線形光学要素(NOE)のための非線形光学材料であって、光学セラミックス、多結晶、微結晶およびナノ結晶、微結晶およびナノ結晶のコロイド、ならびにポリマーまたはガラスマトリックス中の微結晶およびナノ結晶の合成物からなるグループから選択される、非線形光学材料。
- 前記非線形光学材料が、
II−VI族半導体、または
III族に属するGaAs、GaP、およびGaN、IV族に属するSi3N4、およびSiC、VI族に属するGa2O3を有するIII−VI族化合物、
から選択され、ここで、II−VI族半導体が、ZnSe、ZnS、ZnTe、ZnO、CdSe、ZnMgSe、CdMnTe、またはCdZnTeを含む、2元化合物、3元化合物、または4元化合物から選択される、請求項15に記載の材料。 - 前記非線形光学材料が、Cr2+、Fe2+を含む遷移金属(TM)、もしくは希土類金属(RE)のイオンでドープされ、またはTMとREのイオンで共ドープされ、閾値発光の低下を可能にする信号、アイドラー、または信号およびアイドラーのための自発的もしくは誘発されるシードを提供する、請求項15に記載の材料。
- RQPMプロセスを用いた3波非線形相互作用を利用して、インカップルされたポンプ放射を出力信号放射およびアイドラー放射へと変換する光パラメトリックデバイス中で使用される非線形光学要素(NOE)のための非線形光学材料であって、平均粒度が前記3波非線形相互作用のコヒーレンス長の程度のものであり、それによって前記RQPMプロセスを用いて達成可能な最高のパラメトリック利得を有する前記3波非線形相互作用を可能にするように、前記NOEの初期試料の微細構造を変更するステップを含む方法によって準備される、非線形光学材料。
- 前記初期試料の非線形材料が、コロイド、ナノ粉末、ナノ結晶、光学セラミックス、または多結晶を含む、請求項18に記載の材料。
- 前記方法が、前記初期試料をアニール、ホットプレス、または熱アイソタクチック加圧する一方、元の試料を囲む媒質、温度、圧力、期間、ドーパント、およびドーパント濃度ならびにこれらの環境特性の組合せからなるグループから選択される環境特性を制御するステップを含む、請求項18に記載の材料。
- インカップルされたポンプを出力信号放射およびアイドラー放射へと変換し、RQPMプロセスを用いた非線形相互作用を利用する、光パラメトリックデバイスの非線形光学要素(NOE)のための非線形光学材料を特徴付ける方法であって、微細構造中の平均粒度が3波相互作用のコヒーレンス長の程度のものであり、前記RQPMプロセスを用いて達成可能な最高のパラメトリック利得を有する非線形相互作用を可能にするように、光学非線形材料の微細構造が構成されており、
前記NOE中の非閾値非線形プロセスを可能にするように、ポンプ放射を前記非線形光学材料へと選択的に結合するステップであって、前記非閾値非線形プロセスが、第二高調波発生、和周波数発生および差周波数発生からなるグループから選択されるステップと、
RQPM−NOEにおけるパラメトリック相互作用の効率の局所分布を測定し、それによって選択的パラメトリック相互作用の最高効率を有する場所をマッピングするステップと、
を含む、方法。 - 前記OPDの実施のため前記RQPM−NOEの内側のポンピングされる領域として働く、選択的パラメトリック相互作用の最高効率を有する識別された場所を使用するステップをさらに含む、請求項21に記載の方法。
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