Properties of grazing-incidence pulsed Ti:sapphire laser oscillator

パルス斜入射チタンサファイアレーザー共振器の特性

田村 浩司

Tamura, Koji

斜入射型でdouble-grating型を使用した共振器構造の特性を測定した。単一縦モード発振が安定に得られることがわかった。幾何光学的光路計算から、モード安定性はゲイン領域におけるビームwalk-offの増加により説明できた。スペクトル特性の向上は、ビーム分散増加に基づく計算により説明できた。これらは、同位体分離等の応用に望ましい特性であった。

A pulsed operation of a double-grating Ti:sapphire laser oscillator that consists of a gain medium, back mirror, and two gratings, was shown. A stable single longitudinal mode operation was achievable. From the calculation of the optical path, it can be explained by the increased beam walk-off from the gain medium by the introduction of the second grating compared with the conventional grazing incidence cavity geometry. The improved spectral property was also explained by the calculations of increased dispersion. The results indicate that the oscillator configuration was useful for the applications which require stable mode operation and narrow linewidth such as the high resolution spectroscopy or the laser isotope separation.