Photonic-crystal fiber sources for nonlinear spectroscopy

摘要: Photonic-crystal fibers allow the creation of novel compact and convenient light sources for nonlinear spectroscopy. In experiments discussed in this paper, photonic-crystal provide efficient nonlinear-optical transformations femtosecond Cr:forsterite laser pulses, delivering linearly chirped frequency-shifted broadband pulses with central wavelengths ranging from 400 to 900 nm. These were cross-correlated second-harmonic output toluene solution, used as a test object, boxcars geometry measure spectra coherent anti-Stokes Raman scattering (CARS) molecules (XFROG CARS). The blue-shifted chirped-pulse fiber spectrum stretching 530 680 nm is shown be ideally suited time-resolved absorption spectroscopy exciton bands molecular aggregates excited by pulses.