WebApr 1, 2024 · Exciton–polaritons in optical cavities exhibit strong nonlinearities predominantly because of the third-order Kerr-like interactions mediated by the excitonic component. Under quasi-resonant excitation, depending on the energy of the incident laser, it results in the optical limiting or bistable behavior. The latter phenomenon is manifested … WebThe increasing use of low power cw lasers in various applications calls for the design of optical limiters with low thresholds. To this end, the optical nonlinearity exhibited by zinc tetraphenyl porphyrin at low laser powers is utilized to design an optical limiter for low threshold operation. The basic parameter responsible for limiting ...
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WebApr 14, 2024 · The incorporation of 20% Al content in the DBRs opens an optical pumping window from 700 to 820 nm, where the excitation laser light can effectively reach the GaAs cavity above its bandgap while remaining transparent to the DBRs. This results in a substantially improved pump efficiency, a low lasing threshold, and a high thermal stability. WebMay 23, 2016 · In order to evaluate the suitability of the samples as optical limiting, the optical limiting threshold of the samples was measured by using transmittance technique. The results showed that the prepared nanocomposites can be considered as an excellent candidate for optical limiting devices. PMMA/ZnO with high concentration of ZnO … fighting octopus
Overcoming the optical resolution limit - phys.org
WebLimiting devices protect sensitive optical elements from laser-induced damage (LID). Passive devices use focusing optics to concentrate the light through a nonlinear optical (NLO) element (or elements) to reduce the limiting threshold. WebThe films exhibited self-focussing and defocussing nature due to variation in the doping level. Sn 0.94 La 0.06 O 2 film was identified as suitable for optical limiting application due to its least limiting threshold value. Hence, these spray pyrolyzed La doped films can be used in optical and nonlinear optical devices. WebSep 13, 1996 · A nonhomogeneous distribution of indium tetra ( tert -butyl)phthalocyanine chloride along the beam path substantially enhances the excited-state absorption, yielding … grip tuth hair combs