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Journal of Applied Spectroscopy

Effects of thermal interactions on coherent nonlinear optical processes

T. V. Mikhina, Anatoli P. Sukhorukov, I. V. Tomov

Published Dec 1, 1971• 2 citations
Publisher
DOI
10.1007/bf00607049

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Abstract A typical optical experiment consists of three main components. The light is provided by a source, which may be a thermal source that emits chaotic light, but is most often a laser that emits coherent light in quantum-optical experiments. The light is processed in some interaction region of the experiment, where it may, for example, be subjected to attenuation, amplification, beam splitting, or one of the various nonlinear optical processes. The processed light beam is finally detected, for example by the direct or homodyne schemes covered in Chapter 6.
The ability to control and manipulate light with light is crucial for optical information and communication technology. However, all-optical information processing is hindered by the absence of interactions between photons in linear materials. Nonlinear materials mediate effective photon-photon interactions, but require large light intensity. Optical resonators store and confine light for many optical cycles, which increases the interaction time and reduces the nonlinearity threshold. However, monolithic optical resonators have limited variability of the intra-cavity medium. Instead, a wide variety of materials can be easily integrated in tunable open-access microcavities, making them an ideal platform for exploring novel materials for nonlinear optics. In this thesis, we present experiments using coherently driven tunable open-access microcavities hosting either oil or a perovskite semiconductor. In Chapter 2 we demonstrate steady-state room-temperature superfluidity of photons in an oil-filled cavity, and reveal how the fluid dynamics are influenced by the nonlocality of the effective interactions mediated by the oil. Chapters 3 and 4 describe experiments using a halide perovskite semiconductor in an open-access microcavity in a closed-cycle cryostat. We demonstrate continuous-wave nonlinearity in the halide perovskite material through optical bistability, and reveal signatures of a phase transition in the temperature dependence of the nonlinearity strength. Next we investigate the emergence of irreversibility in the bistable switching of our perovskite cavity. Finally, we present in Chapter 5 experimental observations of fast nonlinearity-enabled oscillations in the light intensity, that occur despite the slowness of thermal nonlinearity of the oil.