Abstract
We present a fully digital stabilized semiconductor laser system designed to operate as a fiber-optic front-end of a pulsed power laser PALS (Prague Asterix Laser System). The replacement of the PALS master oscillator is a part of a broader effort to rebuild PLAS into a laser generating shorter pulses with higher pulse power by the technique of optical parametric chirped pulse amplification. With an operating wavelength of 1315.15 nm the stabilized laser is based on a telecommunication single-frequency DFB diode. The frequency stabilization is derived from the same transitions in dissociated iodine as those employed in the following power amplifiers. The lines are detected by means of linear absorption in a heated cell filled with thermally dissociated iodine. The technique of laser frequency stabilization folows the demands of a fully automated self-contained system operated by a remote control. The detection scheme is based on a derivative spectroscopy with a current frequency modulation and thermal wavelength control. The detection chain together with stabilization servo loop is fully digital represented by two signal-processing single-chip controllers.
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