JP6588707B2 - レーザ光源装置及びレーザパルス光生成方法 - Google Patents
レーザ光源装置及びレーザパルス光生成方法 Download PDFInfo
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- JP6588707B2 JP6588707B2 JP2015022467A JP2015022467A JP6588707B2 JP 6588707 B2 JP6588707 B2 JP 6588707B2 JP 2015022467 A JP2015022467 A JP 2015022467A JP 2015022467 A JP2015022467 A JP 2015022467A JP 6588707 B2 JP6588707 B2 JP 6588707B2
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Description
図1には、本発明によるレーザ光源装置1の一例となる構成が示されている。レーザ光源装置1は、光源部1Aと、ファイバ増幅部1Bと、固体増幅部1Cと、波長変換部1Dとが光軸Lに沿って配置され、さらに光源部1A等を制御する制御部100を備えて構成されている。
上述した実施形態では、レーザ光源11からの出力光が光スイッチ素子40の上流側で種光源10から出力されるパルス光と合波されるように構成された例として、前段のファイバ増幅器20の入力側で合波された態様を示したが、二段のファイバ増幅器20,30の間、または後段のファイバ増幅器30の出力側で合波される態様であってもよい。
10:種光源(第1光源)
11:レーザ光源(第2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
60,70:非線形光学素子
100:制御部
Claims (10)
- ゲインスイッチング法でパルス光を出力する第1光源と、前記第1光源から出力されるパルス光を増幅するファイバ増幅器と、前記ファイバ増幅器から出力されるパルス光を増幅する固体増幅器と、前記固体増幅器から出力されるパルス光を波長変換して出力する非線形光学素子と、を備えているレーザ光源装置であって、
前記固体増幅器の上流側に配置され前記種光源から出力されるパルス光と合波可能で発振波長が前記固体増幅器の増幅帯域に含まれるレーザ光を出力する第2光源と、
前記ファイバ増幅器と前記固体増幅器との間に設けられ、前記ファイバ増幅器から前記固体増幅器への光の伝播を許容または阻止する光スイッチ素子と、
前記非線形光学素子からパルス光が出力される出力許容状態から、前記固体増幅器に対する励起光のパワーが維持された状態で、前記光スイッチ素子を制御して前記第1光源からのパルス光の前記固体増幅器への伝播を阻止して前記非線形光学素子からパルス光の出力を停止する出力停止状態を生成するとともに、当該出力停止状態で前記第2光源を発振制御するように構成されている制御部と、を備え、
前記制御部は、
前記出力停止状態でさらに前記第1光源からのパルス光の出力期間と異なる期間に光の伝播を許容するように前記光スイッチ素子を制御し、前記出力停止状態で少なくとも前記第1光源からのパルス光の出力期間と異なる期間に前記第2光源を発振制御し、
前記出力許容状態で前記第1光源からのパルス光の出力期間に光の伝播を許容し、前記第1光源からのパルス光の出力期間と異なる期間に光の伝播を阻止するように前記光スイッチ素子を制御するとともに、前記出力許容状態で前記第2光源の発振を停止制御するように構成されているレーザ光源装置。 - 前記第2光源から出力されるレーザ光が前記光スイッチ素子の上流側で前記第1光源から出力されるパルス光と合波可能に構成され、前記制御部は前記出力停止状態で第2光源を発振制御するように構成されている請求項1記載のレーザ光源装置。
- 前記制御部は、前記出力停止状態で前記固体増幅器から出力される光の平均パワーが、前記出力許容状態で前記固体増幅器から出力される光の平均パワーと略等しくなるように、前記第2光源から出力され前記固体増幅器に入力されるレーザ光のパワーを調整するように構成されている請求項1または2記載のレーザ光源装置。
- 前記出力許容状態のときにのみ前記非線形光学素子から所定パワーの波長変換光が出力されるように、前記固体増幅器の励起光のパワー及び/またはパルス光の繰返し周波数が調整されている請求項1から3の何れかに記載のレーザ光源装置。
- 前記固体増幅器と前記非線形光学素子との間に、前記固体増幅器から前記非線形光学素子への光の伝播を許容または阻止する光スイッチ素子をさらに備え、前記制御部は、当該光スイッチ素子を制御して前記出力停止状態で前記固体増幅器から前記非線形光学素子への光の伝播を阻止するように構成されている請求項1から4の何れかに記載のレーザ光源装置。
- 前記第2光源の発振波長は、前記固体増幅器の増幅帯域のうち、前記第1光源から出力されるパルス光を増幅可能な増幅帯域以外の増幅帯域に設定されている請求項1から5の何れかに記載のレーザ光源装置。
- 前記光スイッチ素子が音響光学素子または電気光学素子を含む動的光学素子で構成されている請求項1から6の何れかに記載のレーザ光源装置。
- 前記第1光源がDFBレーザで構成され、前記制御部は前記DFBレーザを数メガヘルツ以下の周波数で、且つ、数ナノ秒以下のパルス幅で駆動するように構成されている請求項1から7の何れかに記載のレーザ光源装置。
- ゲインスイッチング法で第1光源から出力されたパルス光をファイバ増幅器及び固体増幅器で順次増幅し、増幅後のパルス光を非線形光学素子で波長変換して出力するレーザパルス光生成方法であって、
前記非線形光学素子からのパルス光の出力を許容する場合に、
前記ファイバ増幅器と前記固体増幅器との間に設けた光スイッチ素子を制御して、前記第1光源からのパルス光の出力期間に光の伝播を許容し、前記第1光源からのパルス光の出力期間と異なる期間に光の伝播を阻止するとともに、前記固体増幅器の上流側に配置され前記第1光源から出力されるパルス光と合波可能で発振波長が前記固体増幅器の増幅帯域に含まれるレーザ光を出力する第2光源の発振を停止制御し、
前記非線形光学素子からのパルス光の出力を停止する場合に、
前記固体増幅器に対する励起光のパワーが維持された状態で、前記光スイッチ素子を制御して、前記第1光源からのパルス光の出力期間に光の伝播を阻止し、前記第1光源からのパルス光の出力期間と異なる期間に光の伝播を許容するとともに、前記第2光源を発振制御するレーザパルス光生成方法。 - 前記出力停止状態で前記固体増幅器から出力される光の平均パワーが、前記出力許容状態で前記固体増幅器から出力される光の平均パワーと略等しくなるように、前記第2光源から出力され前記固体増幅器に入力されるレーザ光のパワーを調整する請求項9記載のレーザパルス光生成方法。
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