Abstract
We demonstrated a stable degenerate synchronously pumped femtosecond optical parametric oscillator (SPOPO) as a divide-by-2 subharmonic generator. The SPOPO exhibited passive all-optical self-phase-locking between the pump and signal/idler and thus required no external electronic feedback to produce the phase-locked subharmonic. We employed a type I phase-matched, -long, periodically poled crystal as the nonlinear gain element and an mode-locked Ti:sapphire laser with pulses tuned at as the pump. The SPOPO generated transform-limited phase-locked output pulses centered at . The self-phase-locking operation was confirmed by separate beat-note measurement techniques with respect to the pump laser and with respect to an external cw laser.
© 2008 Optical Society of America
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