Observations of Group Velocity Dispersion, Raman Scattering, Stimulated Raman, and Spectral Broadening for O-waves and E-waves from a Calcite Crystal Using Femtosecond Laser Pulses

Group velocity dispersion (GVD), Raman Spectra, Stimulated Raman Scattering (SRS), and Supercontinuum (SC) are investigated for ordinary (O) waves and extraordinary (E) waves from a 2.7 cm thick Calcite crystal. Using 390 fs pulses (~2 μJ pulse energy) at 517 nm, the O-wave produced a stronger sharp SRS peak at 1086 cm^-1 and weak SC spectrum in the visible range than E-wave. To explain the salient observation, the difference between Raman cross-section, index of refraction (walk-off), GVD, and the size of nonlinear susceptibility, χ3 for O-waves and E-waves of Calcite are presented.
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