We demonstrate the feasibility of the compression of tunable pulses by means of sum-frequency generation under special group-velocity mismatch conditions. β-Barium borate crystal has been shown to support the upconversion process, resulting in 160-fs pulses tunable within 600–720 nm when mixing 1.3-ps 1055-nm pulses from a Nd:glass laser with 0.95-ps pulses tunable within 1400–2200 nm from a traveling-wave parametric generator. A similar compression of ~150-fs Ti:sapphire pulses predicted for the sum-frequency tuning range of 520–590 nm.
© 1996 Optical Society of America
R. Danielius, A. Dubietis, A. Piskarskas, G. Valiulis, and A. Varanavičius, "Generation of compressed 600-720-nm tunable femtosecond pulses by transient frequency mixing in a β-barium borate crystal," Opt. Lett. 21, 216-218 (1996)