Abstract
Mathematical expressions for the shape and amplitude of a photoacoustic signal generated due to the multiphoton absorption of Gaussian laser pulses are derived. It was found that the sensitivity of a photoacoustic spectrometer increases in proportion to n 3/4 when changing from one-photon linear absorption to nonlinear multiphoton absorption, where n is the nonlinearity exponent. Calibration of the photoacoustic spectrometer used in the measurements of multiphoton absorption cross sections is discussed.
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