Narrow-band regenerative amplifier for momentum imaging spectroscopy of molecules

We developed a Ti:Sapphire narrow-band regenerative amplifier for molecular spectroscopy. The gain bandwidth of the regenerative cavity was narrowed to ~0.7 cm
^-1
by three birefringence filters and a plate of etalon. With 1.1-mJ pumping by the second harmonics of Nd: YLF laser, mode-locked seed pulses were amplified to ~25 μJ at 1-kHz repetition.