Abstract
In this letter we investigate nonlinear optical properties of amorphous selenium (a-Se) nanoparticles and trigonal selenium (t-Se) nanowires using the open aperture Z-scan, employing 100fs and 5ns laser pulses, at 800nm and 532nm, respectively. In the former case (ultrafast excitation) optical nonlinearity arises largely from absorption saturation and three-photon absorption, whereas in the latter (short-pulse excitation) it occurs mostly due to excited state absorption. Nonlinearity parameters for both regimes have been numerically evaluated from experimental data. Both allotropes are found to be efficient optical limiters, particularly for short-pulse excitation, with potential applications in laser safety devices.
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