Abstract

The broadband infrared (in the range of 2 μm) and visible radiations were generated in air by focused two-color (wavelengths of about 791 nm and 1.2–1.6 μm, respectively) femtosecond laser pulses. The spectral and angular properties of the radiation generated in both spectral ranges allowed us to interpret it as a result of the interplay between spectral broadening and cascaded four-wave mixing of the incident and frequency-shifted light fields. Results of the numerical modeling of the propagation equation including the nonlinear Kerr term agree well with the experiment.

© 2018 Optical Society of America

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