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By creating two triplet excitons from one photo‐excited singlet exciton, singlet fission in organic semiconductors has drawn tremendous attention for its potential applications in boosting the efficiency of solar conversion. Here, we show that this carrier‐multiplication effect can also be used to dramatically improve the nonlinear optical response in organic materials. We have observed large optical...
We experimentally study the nonlinear optical behaviors of N-type four-level atomic systems inside an optical cavity. These nonlinear effects include two-photon absorption, splitting of dark polariton, modified self-Kerr nonlinearity, Raman amplification, and white-light cavity.
We report the fractional second-harmonic Talbot effect associating with the χ(2) in periodically-poled LiTaO3 (PPLT) crystals. Our results show that the images are sensitive to the duty circle and the background of the array.
We study theoretically and experimentally the strongly-coupled, nonlinear regime of a hot vapor of three-level atoms in an optical cavity. Interesting effects include lasing without inversion and polariton peak splittings.
Spatial and temporal interferences between four-wave mixing and six-wave mixing signals are observed by using phase-control between these nonlinear optical processes in a four-level atomic system. Atomic coherence is the key to observe such phenomenon.
We experimentally demonstrate phenomenon of stochastic-resonance in optical bistability from an optical ring cavity containing three-level (Lambda-type) rubidium atoms. The measured results match qualitatively with theoretical predictions of the generic model for the SR phenomenon.
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