Compared to infrared lasers, high-power continuous-wave single-frequency (HPCWSF) laser sources emitting green light are beneficial in various engineering and physics applications. But in the past their output powers were limited to about 20 W. Light shining through a wall (LSW) experiments utilized pulsed lasers in the past. Their sensitivity was limited by the available average output powers of those systems with suitable beam quality and pulse length. These remained below 10 W. In this thesi ...