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This article suggests using filamentation effect of intense femtosecond pulses. Intensity of the light pulse becomes very high in filament, and interaction length for frequency conversion can be long. Here, efficient deep-ultraviolet (DUV) and mid- infrared (MIR) sub-20-fs pulse generation by four-wave mixing processes through filamentation in gases is demonstrated. For MIR pulse generation, air was...
Summary form only given. We have demonstrated DUV pulses generated by non-degenerate four-wave mixing through filamentation in neon gas. The pulse energy easily reaches ten micro joule order or more. The generated spectra, centered at 267 nm and 200 nm, are broad enough to be 10-fs pulses. The 267 nm pulses were compressed down to 13 fs by a single-pass grating compressor and characterized by TG-FROG...
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