Author/Authors :
Konorov، نويسنده , , S.O. and Akimov، نويسنده , , D.A. and Ivanov، نويسنده , , A.A. and Alfimov، نويسنده , , M.V. and Yakimanskii، نويسنده , , A.V. and Zheltikov، نويسنده , , A.M.، نويسنده ,
Abstract :
Specially designed photonic-crystal fiber frequency converters of ultrashort laser pulses are shown to be ideally suited for probing resonant nonlinearities in organic materials. Photonic-crystal fibers used in our experiments provide an efficient frequency upshifting of femtosecond pulses of 1.25-μm Cr: forsterite laser radiation, generating broadband radiation within the 570–700-nm wavelength range. This radiation is then employed to probe the quadratic nonlinearity of a poled azopolymer film through noncollinear sum-frequency generation.
