Subpicosecond timing stabilization of solid-state pumped Ti:sapphire lasers
Abstract
Mode-locked Ti:sapphire lasers with low timing jitter (phase noise) are necessary for a variety of applications such as phase fluorimetry and electro-optic sampling as well as for pump-probe experiments where the Ti:sapphire laser needs to be synchronized to another source.
Our stabilization system consists of a phase-locked loop and active cavity length control with a motor-controlled mirror for coarse and a PZT for fine adjustment. Previously, an Argon ion laser with an amplitude noise of 0.3% rms was used as the pump source. The stabilization system can typically reduce the timing jitter of an Argon ion pumped Ti:sapphire laser to a few picoseconds.
Recently, intracavity frequency-doubled diode-pumped solid-state (DPSS) lasers have become available for pumping Ti:sapphire lasers. These sources have less than 0.1% rms noise and reduced phase noise has already been reported from unstabilized lasers. Using this low noise DPSS pump source, we have reduced the jitter between two mode-locked Ti:sapphire lasers to less than one picosecond.