I. O. Kinyaevskii, Ya. V. Grudtsyn, A. V. Koribut, M. V. Ionin
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Abstract
In order to increase the energy of a signal wave for a difference frequency generator, a spectral broadening of 100-fs pulses from a Ti:sapphire laser (center wavelength of 950 nm) is experimentally studied during their filamentation in five different gases: N2, NH3, He, CO2, and CO. The greatest broadening and the highest energy in the Stokes region of the spectrum are observed for CO2. Variation in the CO2 pressure in the gas cell shows that for a Ti:sapphire laser with a pulse energy of several mJ, the highest radiation energy in the Stokes wing with a shift of ∼1000 cm–1 is achieved at a pressure of 1 bar. Also, for each of the studied gases, the nonlinear refractive index is estimated at a pressure of 1 bar.
期刊介绍：
Bulletin of the Lebedev Physics Institute is an international peer reviewed journal that publishes results of new original experimental and theoretical studies on all topics of physics: theoretical physics; atomic and molecular physics; nuclear physics; optics; lasers; condensed matter; physics of solids; biophysics, and others.
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