[PDF]    http://dx.doi.org/10.3952/lithjphys.46216

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 46, 177–183 (2006)


PARAMETRIC DOWN-CONVERSION OF HIGHER-ORDER BESSEL OPTICAL BEAM IN CUBIC NONLINEAR MEDIUM
V. Pyragaitė and A. Stabinis
Department of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania
E-mail: algirdas.stabinis@ff.vu.lt

Received 10 March 2006

It is revealed that the orbital angular momentum is conserved during the spontaneous parametric down-conversion of a higher-order Bessel beam propagating in a cubic nonlinear medium. This is the result of transverse selection of the spontaneously arising optical fields in an optical parametric generator pumped by Bessel beam, due to transverse phase matching of interacting conical waves.
Keywords: Bessel beam, parametric down-conversion, orbital angular momentum
PACS: 42.60.Jf, 42.65.-k, 42.65.Yj


PARAMETRINIS AUKŠTESNĖS EILĖS BESELIO OPTINIO PLUOŠTO DAŽNIO MAŽINIMAS KUBINĖJE NETIESINĖJE TERPĖJE
.V. Pyragaitė, A. Stabinis
Vilniaus universitetas, Vilnius, Lietuva

Parodyta, kad savaiminio parametrinio aukštesnės eilės Beselio (Bessel) pluošto dažnio mažinimo kubinėje netiesinėje terpėje metu galioja orbitinio kampinio momento tvermės dėsnis. Tai yra parametriniame šviesos generatoriuje vykstančios optinių laukų skersinės atrankos pasekmė, kai generatorius kaupinamas Beselio pluoštu.


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