Spectral phase transfer to ultrashort UV pulses through four-wave mixing.
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.
Zuo
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Chemical Dynamics Laboratory, RIKEN Advanced Science Institute, Hirosawa 2-1, Wako, Saitama, 351-0198, Japan.
Fuji
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Suzuki
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