Spectral phase transfer to ultrashort UV pulses through four-wave mixing.

Chemical Dynamics Laboratory, RIKEN Advanced Science Institute, Hirosawa 2-1, Wako, Saitama, 351-0198, Japan.
Optics Express (Impact Factor: 3.53). 07/2010; 18(15):16183-92. DOI: 10.1364/OE.18.016183
Source: PubMed

ABSTRACT Transfer of spectral phase from near infrared ultrashort pulses to deep ultraviolet (UV) sub-30-fs pulses through four-wave mixing process is demonstrated. Micro joule UV pulses at 237 nm were generated by nonlinear mixing of second harmonic pulses of Ti:sapphire laser output and near infrared pulses from a noncollinear optical parametric amplifier. Chirp of the near infrared pulse was transferred to the UV pulse with the opposite sign. A positively chirped near infrared pulse was used for generating a negatively chirped UV pulse, which was compressed down to 25 fs by a magnesium fluoride window.