Two-photon pumped random laser in nanocrystalline ZnO

Abstract : Thin film of ZnO nanoparticles with dimension of about 5–10 nm were fabricated by the pulsed laser ablation method. By using a femtosecond laser beam at 700 nm to pump micrometer-thick films the authors observed two-photon-induced lasing at 385 nm. Experimentally obtained dependence of the threshold on the excitation spot radius r0 is closer to (1/r_0^2) than to (1/r_0), thus suggesting efficiency of the feedback by scattering-random lasing. The experimental data on nonlinear transmission of the film at the wavelength of pumping are presented.
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Applied Physics Letters, American Institute of Physics, 2006, 89 (17), pp.171119. 〈10.1063/1.2370879〉
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E. V. Chelnokov, N. Bityurin, Igor Ozerov, Wladimir Marine. Two-photon pumped random laser in nanocrystalline ZnO. Applied Physics Letters, American Institute of Physics, 2006, 89 (17), pp.171119. 〈10.1063/1.2370879〉. 〈hal-00115824〉

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