Abstract

We demonstrate the generation of femtosecond pulses in a synchronously pumped optical parametric oscillator (SPOPO) at the harmonics of pump repetition rate using a SPOPO cavity longer than the fundamental synchronous length. The SPOPO is based on a 1mm crystal of periodically poled LiNbO3 and pumped by a Kerr-lens mode-locked Ti:sapphire laser at 76MHz. By increasing the SPOPO synchronous cavity length we have generated output signal pulses at successive harmonics of the pump repetition rate up to the 13th harmonic at 988MHz, where average signal powers of 30mW are still available for 1.45W of pump power. The generated signal pulses at 988MHz are near transform limited with average durations of 227fs and a time-bandwidth product of 0.41 for 185fs input pump pulses.

© 2009 Optical Society of America

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