We propose a scheme for optimizing the time delay between the pump and seed pulses of an optical parametric amplifier (OPA) over a large spectral range. The efficiency of this method is demonstrated for a femtosecond BBO parametric amplifier seeded with a white-light continuum pulse. The error signal used for intensity stabilization results from a modulation of the temporal delay between the pump and the continuum pulses and phase-sensitive detection of the amplified signal. It allows us to lock the delay to the position that maximizes the OPA gain.
© 1998 Optical Society of America
(190.0190) Nonlinear optics : Nonlinear optics
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(320.7120) Ultrafast optics : Ultrafast phenomena
(350.4600) Other areas of optics : Optical engineering
Eric Freysz, Joel Plantard, Remy Gillet, Rysvan Maleck Rassoul, Philippe Grelu, and André Ducasse, "Automatic Time Delay Optimization Between the Pump and Seed Pulses of a Broadly Tunable Femtosecond Optical Parametric Amplifier," Appl. Opt. 37, 2411-2413 (1998)