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Frontiers in Optics

Optical Beam Bistability and Hysteresis in onlinear anosuspensions

Alexander V. Shamray, Georgii E. Pobegalov, Peter M. Agruzov, P V Gaenko, Igor V. Il'ichev

Published Jan 1, 2011• 0 citations
Publisher

Abstract

An optical bistability and hysteresis were observed in the LaF3:Er:Yb nanosuspension. It was driven by the light-induced change in a local particle concentration and explained as a threshold behavior of the nonlinear four waves mixing.
DOI
10.1364/fio.2011.jtua28

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In this paper, we report the investigation of the optical bistability and hysteresis in the device based on phase conjugated mirror in colloidal solution of LaF3: Er,Yb nanocrystals. Oleic acid (OA)-modified LaF3: Er,Yb nanocrystals have been prepared by a phase transfer and separation mechanism occurring at the interfaces of the liquid, solid and solution phases present during the synthesis [1]. We chose 20% (molar ratio) Yb3+ions as codoping concentration in the preparation of the nanocrystals. The obtained nanocrystals was redistributed in carbon tetrachloride (CCl4) which was used as the solvent based on following three factors: (1) it does not exhibit absorption bands in NIR region because of its low fundamental vibration energy, (2) it eliminates any residual H2O that serves as an effective quencher for NIR emission, and (3) it has a relatively high refractive index compared with other non-polar solvents and therefore minimizes loss of light due to Rayleigh scattering.
Two years ago, the first proposal and demonstration of self-focusing optical bistability was published.1 In this paper it was shown that a self-focused beam in a nonlinear medium would exhibit hysteresis if the beam were reflected back on itself. The effect was demonstrated using a dye laser beam and Na vapor as the nonlinear medium. The optical hysteresis observed is in good qualitative agreement with a recently - published analysis of this system.2 By taking account of the saturation of the nonlinearity, more complex behavior has been predicted.2 This behavior is due to oscillations of the spot size as the self-focused beam propagates through the nonlinear medium. In this paper we report on our experimental studies of optical multistability due to these spot size oscillations.
The dependence of the shift of an optical bistability hysteresis curve on the nonlinear phase shift induced by a controlling light is observed in a four-level atomic system of 87 Rb inside an optical ring cavity. In the process the intensity of the coupling beam keeps constant and the atomic system is operated at near conditions of coherent population trapping due to atomic coherence. The refractive and absorptive chi3 nonlinearities enhanced by atomic coherence provide the physical mechanism of the phenomena. Based on the effects, all-optical flip-flop and storage of optical pulse signals with a low peak power of several tens of microwatts are implemented.