Abstract
A method to calibrate the peak power spectral density (PSD) for white light continuum (WLC) has been proposed. It is applied to measure degenerate two-photon absorption (TPA) coefficients β for continuous spectral range at 550–750 nm and obtains consistent results with the previous work. Via this method, it has been proved that different spectral components can be appropriately dispersed by adding an adequate chirp so that degenerate TPA coefficients can be extracted. Two factors are demonstrated to impact the extraction of nondegenerate absorption contribution using Z-scan setup. One is the co-effect of the band width (line width) of incident pulses and the nonlinear absorption (NLA) band width of the material on the nondegenerate absorption. The other one is the balance between chirp effect caused by the dispersion and nonlinearity. As a consequence, in order to obtain degenerate NLA information, the chirp of WLC pulses should be set to be an appropriate value especially for materials with broad NLA coefficients.
Published Version
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