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Acta Physica Polonica A

Optical Polarisation Bistability in χ2Media at Large Desynchronisation Regime

Waldemar Jęda, Andrzej Zagorski

Published Apr 1, 2004• 0 citations
Publisher

Abstract

Po land b Facul ty of Physi cs, W arsaw Uni versi ty of T echnology Ko szyko wa 75, 00-662 W arszawa, Po l and ( Recei ved December 10, 2003) In t his work w e present results of calcula tion s concernin g bistabil it y of optical polarisati on in biref ringen t me dia .Second -order optical nonlin eari ty is assumed to be dominant and represented by one parameter.In our mo del the second-harmoni c generation regime is assumed.Light transmission is analysed in terms of standard F abry { Perot mo del of feedback.W e deri ved formulas for the Stokes parameters describin g the polaris atio n state.N umerical results show ed that three parameters may exhibit bistable behaviour.T his creates new possibi li tie s for optical switching.

DOI
10.12693/aphyspola.105.357

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Po land b Facul ty of Physi cs, W arsaw Uni versi ty of T echnology Ko szyko wa 75, 00-662 W arszawa, Po l and ( Recei ved December 10, 2003) In t his work w e present results of calcula tion s concernin g bistabil it y of optical polarisati on in biref ringen t me dia .Second -order optical nonlin eari ty is assumed to be dominant and represented by one parameter.In our mo del the second-harmoni c generation regime is assumed.Light transmission is analysed in terms of standard F abry { Perot mo del of feedback.W e deri ved formulas for the Stokes parameters describin g the polaris atio n state.N umerical results show ed that three parameters may exhibit bistable behaviour.T his creates new possibi li tie s for optical switching.
We present a model calculation of optical bistability and polarisation evolution in optically birefringent media based on the interaction of three waves.Second-order optical nonlinearity (described by the third rank susceptibility tensor) is assumed to be dominant.A bistable light transmission is analysed in terms of standard Fabry-Perot model of feedback, and is a direct consequence of the results obtained for a semi-infinite medium.A second effect considered in the paper is evolution of polarisation state of the waves involved in these processes.We derived a closed formula for intensity-dependent refractive index, which corresponds to that used in the case of third-order nonlinear media.As a result, we calculated both intensity • and Stokes parameters of transmitted light.
The behaviour of a F P resonator filled with a nonlinear medium and irradiated by a strong e.m. field nearly resonant with bo th one cavi ty mode and with the medium is bistable (optics1 bistability), the main characteristic feature being tha t the outgoing power can have two distinct values for a proper choice of the parameters defining the state of the entire system. I n view of the interest both from a fundamenta l point of view and from the potent ial applications r the field of integrated optics of bistable devices, a very intensive effort has been made to s tudy the various aspects of OB (1).
Over the past decade, research with acoustooptic hybrid bistable devices has been primarily concerned with operation in the first Bragg regime involving two to four diffracted orders. In this paper, a model that includes both acoustooptic diffraction and nonlinear feedback will be used to investigate optical bistability in the second Bragg regime. In addition, theoretical simulations will be used to compare this system with an identical system operating in the first Bragg regime. Theoretical and experimental results will be presented.
eri ment al Ph ysi cs, W arsaw Uni versi ty Ho âa 69, 00-681 W arszawa, Pol an d b G ra m mar School No 3, Conra da 6, 01-922 W arszawa, Pol and c Insti tute of Physi cs, W arsaw Uni versi ty of Technol ogy Ko szykowa 75, 00-662 W arszawa, Po l and ( Recei ved Febr uar y 19, 2002) W e rep or t on ver y pre cise measurements of t he absorption pro Ùle of the 326.1 nm resonance line of cadmium broadened by interactions w ith the ground state C d atoms under thermal equilib riu m.T he exp erimental