Quantitative deviation of the two-photon absorption coefficient based on three laser pulse models

【摘要】 <正>The pulse profile influence of excitation light on the two-photon absorption coefficientβis theoretically and numerically studied.Based on Gaussian spatial and temporal laser,we obtain an expansion formula of energy transmission.As compared with a plain beam and a pulse beam that is rectangular in time but Gaussian in space,the relative deviations ofβturn out to be about 214%and 47%,respectively.These differences indicate that a smallerβmay be obtained than the real one in usual nonlinear transmission. Our result suggests that by taking real pulse profile into account,a more exactβcan be derived in energy transmission measurement.更多还原

【Abstract】 The pulse profile influence of excitation light on the two-photon absorption coefficient β is theoretically and numerically studied.Based on Gaussian spatial and temporal laser,we obtain an expansion formula of energy transmission.As compared with a plain beam and a pulse beam that is rectangular in time but Gaussian in space,the relative deviations ofβturn out to be about 214%and 47%,respectively.These differences indicate that a smallerβmay be obtained than the real one in usual nonlinear transmission. Our result suggests that by taking real pulse profile into account,a more exactβcan be derived in energy transmission measurement.更多还原