LASER RESONATOR CONTAINING TRIANGULAR OPTICAL SHADING PLATE

The mode character of the optical resonator has been analyzed numerically by successive approximation with computer. In this paper, by the same technique, the amplitude, phase, and eigenvalue about generation modes (00 and 01 modes) are found, when optical shading plate whose edge angle was 90 degrees was set in the center of the parallel plane resonator or confocal spherical one. These are calculated by FRESNEL NUMBER as parameters.Consequently, the influence of edge becomes stronger with the shortening of resonater length. As soon as the position of the peak of the edge goes accross the axis, diffraction loss and phase shift increase. The influence of the edge, acting on the resonant frequency, is also studied. This analyzing method can be applied to the optical resonator with another styles.レーザ共振器に用いられる光共振器のモード特性は，現在までに電子計算機を用いて遂次近似法により数値的に解析されている。本文はこれと同じ方法により，平行板型と共焦点型の共振器中央に，エッジ角が90度の光遮蔽板を挿入したときの発生モード（00及び01モード）について，振幅，位相を求めたもので，結果として，鏡間距離が短くなると00モードではエッジの影響が強くなる。エッジの頂点の位置が中央を越えると，回折損失，位相推移が急激に大きくなる。又エッジの共振周波数に及ぼす影響をも求められた。この解析法は他の形の遮蔽板をもつレーザ共振器の解析にも応用出来る