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Temporal waveform control of laser pulse by frequency chirping

Yoshinori Kato, Hidetsugu Yoshida, Hisanori Fujita, Sadao Nakai1999年Fusion Engineering and DesignIF 1.7出版社

AbstractArbitrary temporal waveform control can be achieved by means of amplifier gain control with chirped laser pulse. As lasers for fusion research are broad-band glass lasers, a chirping method of the THz region is required to obtain arbitrary temporal waveform control. In order to precisely simulate amplification properties of chirped pulse, we have developed the simulation code for an inhomogeneous glass laser amplifier. Included physics are as follows: temporal chirping; relaxation of lower level; and change of distribution density between sub-levels. Chirping (0.9 THz) applied to a Gaussian pulse increased the peak intensity of output in 20% to the case without chirping.

日本語訳

任意の時間波形制御は、チャープレーザーパルスを用いた増幅器利得制御によって達成することができる。核融合研究用レーザーは広帯域レーザーであるため、任意の時間波形制御を得るにはTHz領域のチャープ方式が必要となる。チャープパルスの増幅特性を精密にシミュレートするため、不均一ガラスレーザー増幅器用のシミュレーションコードを開発した。含まれる物理過程は以下の通りである:時間チャープ、下準位の緩和、および副準位間の分布密度の変化。ガウスパルスに0.9 THzのチャープを適用したところ、チャープなしの場合と比較して出力のピーク強度が20%増加した。

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