JP2021019054A - レーザ装置及びレーザ光生成方法 - Google Patents
レーザ装置及びレーザ光生成方法 Download PDFInfo
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Abstract
Description
この場合、合波後のレーザ光L3の光強度波形I(t)は、下記の数式(3)として表される。
上記の数式(3)の右辺には、差周波数(f2−f1)に関する項が含まれている。この差周波数(f2−f1)が、レーザ光L3に含まれるバーストパルスのビート周波数となる。従って、レーザ光L1,L2の周波数f1,f2が近いほどバーストパルスのビート周波数は小さくなり、周波数f1,f2が離れるほどバーストパルスのビート周波数は大きくなる。
ここで、上記実施形態の実施例について説明する。図7の(a)及び(b)は、バーストパルス周波数を1GHzとするために波長が調整された、レーザ光L1,L2のスペクトルの例を示すグラフである。図7の(a)はレーザ光L1のスペクトルを示し、図7の(b)はレーザ光L2のスペクトルを示す。レーザ光L1の中心波長は1064.755nm(周波数f1=281.755THz)であり、レーザ光源11の半導体レーザ素子15の温度は23.37℃であった。また、レーザ光L2の中心波長は1064.751nm(周波数f2=281.756THz)であり、レーザ光源12の半導体レーザ素子15の温度は26.01℃であった。図8は、この例において生成されたバーストパルスを示すグラフである。図8において、縦軸は光強度を表し、横軸は時間を表す。このグラフにおいて、バーストパルス周波数Δfはf1−f2=1GHzであり、パルス幅は500ピコ秒であった。レーザ光L1,L2の時間波形がガウス波状であったため、バーストパルスの包絡線は同様にガウス波状となっている。
図18は、上記実施形態の第1変形例として、レーザ装置1Bの構成を概略的に示す図である。レーザ装置1Bは、上記実施形態のレーザ装置1Aの構成に加えて、光アイソレータ51,52,53,及び54と、光ファイバ増幅器61と、固体レーザ増幅器62及び63と、バンドパスフィルタ71とを備える。
図19は、上記実施形態の第2変形例として、光源17の構成を概略的に示す図である。上記実施形態のレーザ装置1Aまたは第1変形例のレーザ装置1Bにおいて、光源部10Aのレーザ光源11,12の一方又は双方は、本変形例の光源17に置き換えられてもよい。
図20は、上記実施形態の第3変形例として、光源18の構成を概略的に示す図である。上記実施形態のレーザ装置1Aまたは第1変形例のレーザ装置1Bにおいて、光源部10Aのレーザ光源11,12の一方又は双方は、本変形例の光源18に置き換えられてもよい。
図21の(a)及び(b)は、上記実施形態の第4変形例として、それぞれ光源19A及び19Bの構成を概略的に示す図である。上記実施形態のレーザ装置1Aまたは第1変形例のレーザ装置1Bにおいて、光源部10Aのレーザ光源11,12の一方又は双方は、本変形例の光源19Aまたは19Bに置き換えられてもよい。
図22は、上記実施形態の第5変形例として、光源部10Bの構成を概略的に示す図である。上記実施形態のレーザ装置1Aまたは第1変形例のレーザ装置1Bにおいて、光源部10Aは、本変形例の光源部10Bに置き換えられてもよい。図22に示すように、光源部10Bは、モード同期レーザ光源102と、第1バンドパスフィルタ103と、第2バンドパスフィルタ104とを有する。第1バンドパスフィルタ103は、モード同期レーザ光源102と光学的に結合され、モード同期レーザ光源102から出力されるレーザ光L7からレーザ光L1の波長に相当する成分を取り出す。第2バンドパスフィルタ104は、モード同期レーザ光源102と光学的に結合され、モード同期レーザ光源102から出力されるレーザ光L7からレーザ光L2の波長に相当する成分を取り出す。本変形例によれば、互いに波長が異なるレーザ光L1,L2を生成するためのレーザ光源を共通にできるので、光源部を簡易に構成することができる。
図23の(a)及び(b)は、上記実施形態の第6変形例として、それぞれ光源20A及び20Bの構成を概略的に示す図である。上記実施形態のレーザ装置1Aまたは第1変形例のレーザ装置1Bにおいて、光源部10Aのレーザ光源11,12の一方又は双方は、本変形例の光源20Aまたは20Bに置き換えられてもよい。
Claims (10)
- 第1レーザ光及び前記第1レーザ光とは波長が異なる第2レーザ光を、それぞれ異なる光路へ出力する光源部と、
前記光源部と光学的に結合され、前記第1レーザ光と前記第2レーザ光とを合波して、前記第1レーザ光の波長と前記第2レーザ光の波長との差に応じた周波数でもってバーストパルスを発生させる光合波部と、
を備え、
前記光源部において、前記第1レーザ光及び前記第2レーザ光の各波長は、前記バーストパルスの周波数が或る周波数となるように予め設定されているか又は設定可能であり、
前記或る周波数は1GHz以上である、レーザ装置。 - 前記或る周波数は2000GHz以下である、請求項1に記載のレーザ装置。
- 前記光源部において、前記第1レーザ光及び前記第2レーザ光のうち少なくとも一方の波長が可変である、請求項1または2に記載のレーザ装置。
- 前記第1レーザ光を発生するレーザ光源、及び前記第2レーザ光を発生するレーザ光源のうち少なくとも一方が波長可変レーザである、請求項3に記載のレーザ装置。
- 前記第1レーザ光を発生するレーザ光源、及び前記第2レーザ光を発生するレーザ光源のうち少なくとも一方がQスイッチレーザであり、
前記Qスイッチレーザの種光源が波長可変レーザである、請求項3に記載のレーザ装置。 - 前記波長可変レーザは、
分布帰還型の半導体レーザ素子と、
電気信号に応じて前記半導体レーザ素子の温度を変更する温度制御部と、
を有する、請求項4または請求項5に記載のレーザ装置。 - 前記波長可変レーザは、
レーザ共振器と、
前記レーザ共振器における一方の共振器端を構成し、波長−光反射特性が可変である光反射部と、
を有する、請求項4または請求項5に記載のレーザ装置。 - 前記光源部は、
モード同期レーザ光源と、
前記モード同期レーザ光源と光学的に結合され、前記モード同期レーザ光源から出力されるレーザ光から前記第1レーザ光の波長に相当する成分を取り出す第1バンドパスフィルタと、
前記モード同期レーザ光源と光学的に結合され、前記モード同期レーザ光源から出力されるレーザ光から前記第2レーザ光の波長に相当する成分を取り出す第2バンドパスフィルタと、
を有する、請求項1または2に記載のレーザ装置。 - 前記第1レーザ光及び前記第2レーザ光の合波前の波形を互いに同一の波形に制御する波形制御部を更に備える、請求項1〜8のいずれか1項に記載のレーザ装置。
- 第1レーザ光及び前記第1レーザ光とは波長が異なる第2レーザ光を、それぞれ異なる光路へ出力する第1ステップと、
前記第1レーザ光と前記第2レーザ光とを合波して、前記第1レーザ光の波長と前記第2レーザ光の波長との差に応じた周波数でもってバーストパルスを発生させる第2ステップと、
を含み、
前記第1ステップにおいて、前記第1レーザ光及び前記第2レーザ光の各波長を、前記バーストパルスの周波数が1GHz以上となるように設定する、レーザ光生成方法。
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