Near resonant nanosecond laser-driven nonlinear optical response in As50S50 thin films

  title={Near resonant nanosecond laser-driven nonlinear optical response in As50S50 thin films},
  author={Dipendranath Mandal and Pritam Khan and K. V. Adarsh},
  journal={Journal of Physics D: Applied Physics},
Nanosecond near resonant excitation in As50S50 thin films leads to strong nonlinear optical response, i.e. nonlinear absorption coefficient up to 4 × 106 cm GW−1 and nonlinear refractive index of 8.5 cm2 GW−1, both of which are the strongest ever reported in amorphous semiconductors. We propose a three-level energy band model to explain this effect, which indicates that the nonlinear process is reverse saturable absorption in nature, mediated by excited-state absorption from slow interband… 

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