T. Gießel, R. Weber, I. Will, F. Noack, R. Schumann

For combined laser and synchrotron radiation experiments we use a regenerative amplified Ti:sapphire laser (Coherent, RegA9050) with a home-built Ti:Sa oscillator. The oscillator is synchronized to the master clock of the BESSY storage ring via active control of the cavity length of the oscillator.

The Ti:Sapphire oscillator (Coherent Mira) runs at ~83.3 MHz repetition rate. Every 400th pulse from the oscillator is picked and serves as a seed pulse for a second amplifying oscillator, which results in a final repetition rate of ~208.3 kHz.

A second non-amplified laser system (Ti:Sapphire oscillator: Coherent Mira, 100 fs pulse length, 20 nJ /pulse at 800nm)) was modified at the Max-Born-Institute in order to synchronize the laser pulses to the BESSY master clock. The repetition rate here is 62.5 MHz, which means, that laser pulses meet every 8th synchrotron radiation pulse in multi bunch mode and every synchrotron radiation pulse in single bunch mode. This system is used by BESSY research groups.