JP6322277B2 - 波長変換装置 - Google Patents
波長変換装置 Download PDFInfo
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- JP6322277B2 JP6322277B2 JP2016504034A JP2016504034A JP6322277B2 JP 6322277 B2 JP6322277 B2 JP 6322277B2 JP 2016504034 A JP2016504034 A JP 2016504034A JP 2016504034 A JP2016504034 A JP 2016504034A JP 6322277 B2 JP6322277 B2 JP 6322277B2
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Description
図2(d)に示すように、複数の非線形光学素子70A,70B,70Cを備えた構成によれば、ビーム径を拡径しながらも長期に渡り非線形光学素子を交換することなくレーザ光源装置1を稼働させることができる。
図3(a),(b)及び図4(a),(b)に示すように、第2波長変換部1Fは、隔壁730を介して2領域R1,R2に領域分割され、一方の領域R1に入射窓720が設けられるとともに他方の領域R2に出射窓750が設けられたケーシング700に配置されている。ケーシング700を覆う蓋体770,780によって一方のみ開放可能に構成されている。つまり、蓋体770によって領域R2が覆われ、蓋体780によって領域R1が覆われ、蓋体780を取り外すことによって領域R1が開放されても、領域R2の被覆状態は維持されるように構成されている。
図9に示すように、初期の段階の位相整合方法は、装着工程S1と、第1温度調整工程S2と、粗調整工程S3と、第1微調整工程S4と、第2微調整工程S5と、記憶工程S6の各工程を備えて構成されている。
熱源870を介して任意の非線形光学素子70を所定の目標温度、つまり150℃に調整する第2温度調整工程(S7)と、各非線形光学素子70に対応付けられた調整温度を記憶部から読み出す温度読み出し工程(S8)と、波長変換対象となる非線形光学素子70を、熱源870を介して温度読み出し工程(S8)で読み出された調整温度に調整する第3温度調整工程(S9)と、第3温度調整工程で温度が調整された後に当該非線形光学素子70に入射光を入射させて波長変換する波長変換工程(S10)とが制御部によって実行される。尚、第2温度調整工程を省略して、直ちに非線形光学素子70を第3温度調整工程で調整温度に調整するように構成してもよい。全ての非線形光学素子が使用されると(S10,Y)、新しい非線形光学素子に交換すべく、上述のステップS1からの処理が繰り返される。
上述した実施形態では、3つの非線形光学素子70が入射レーザ光の光軸と直交するX,Y平面上でX軸方向に並設された例を説明したが、図10(a)に示すように、複数の非線形光学素子70をY軸方向に並設してステージ71をY軸方向に移動可能に構成してもよい。
1F:波長変換装置
10:種光源
20,30:ファイバ増幅器
40:光スイッチ素子
50:固体増幅器
60:非線形光学素子(LBO結晶)
70:非線形光学素子(CLBO結晶)
71:ステージ
80:収容部
700:ケーシング
720:入射窓
730:隔壁
740:開口
750:出射窓
800:フレキシブルチューブ
Claims (3)
- 入射レーザ光の波長を変換する非線形光学素子を備えている波長変換装置であって、
隔壁を介して領域分割され、一方に入射窓が設けられるとともに他方に出射窓が設けられたケーシング、及び、前記ケーシングの一方のみ開放可能な蓋体と、
前記ケーシングの一方の領域に配置され、前記非線形光学素子が収容された収容部、及び、前記収容部を着脱自在に固定するとともに前記入射窓から入射したレーザ光の光軸と直交する方向に前記非線形光学素子を前記収容部と一体に移動させるステージと、
前記ケーシングの他方の領域に配置され、前記収容部から出射して前記隔壁に形成した開口を通過したレーザ光を前記出射窓に導く光学系と、
前記収容部と前記開口とを接続するフレキシブルチューブと、
前記ケーシングの一方の領域に備えたパージガス供給部から前記収容部に供給されたパージガスが前記フレキシブルチューブを介して前記ケーシングの他方の領域に供給されるように構成されている波長変換装置。 - 前記ステージを基準にして非線形光学素子のC軸と入射レーザ光の光軸との成す角度を機械的に調整可能な角度調整機構が設けられている請求項1記載の波長変換装置。
- パージガスを前記ケーシングから排気する排気口が前記出射窓に設けられた出射光学窓近傍に形成されるとともに、前記排気口から排気されたパージガスを出射光学窓に導く風洞が配置されている請求項1または2記載の波長変換装置。
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