Abstract

In an ordinary laser operation a misalignment of resonator mirrors leads usually to undesirable effects and has to be avoided. But in some certain types of cavity configurations deliberate introduction of misalignment makes it possible to improve considerably the characteristics of output radiation. An example of such configurations is an optical scheme with hole coupling. We considered two options:

• the free electron laser (FEL) with the radiation output through the on-axis hole at the exit mirror;¹

• the external resonator (used for pulse stacking) where the exit FEL radiation enters this resonator through the on-axis hole at the input mirror.²

These configurations were investigated with the continuous wave 3-D code developed earlier.³

© 1994 IEEE