Abstract

We investigate the characteristics of a thin disk laser system based on the master oscillator—power amplifier design. The amplifier emits parasitic laser oscillation (PL) when the wavelength of the tunable narrow-bandwidth seed pulse is detuned more than 4nm from the gain maximum at 1030nm. For suppression of this unwanted PL, a birefringent filter (Lyot filter) was inserted into the amplifier cavity in order to generate wavelength selective losses, especially at the gain maximum of the Yb:YAG crystal. It is shown that the tunability range of the laser system can be extended by a factor of 4, when a prop erly chosen Lyot filter is applied and its angle of rotation is adapted to the seed wavelength of the system.

© 2010 Optical Society of America

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