Title :
Parametric down-conversion of Bessel vortex beam in quadratic medium
Author :
Pyragaite, V. ; Piskarskas, A. ; Regelskis, K. ; Smilgevicius, V. ; Stabinis, A. ; Mikalauskas, S.
Author_Institution :
Dept. of Quantum Electron., Vilnius Univ., Lithuania
Abstract :
This study predicts and demonstrates that orbital angular momentum (OAM) is conserved within the spontaneous down-conversion of Bessel vortex beam in optical parametric generators (OPG). Results show that the output radiation of CDA-based OPG pumped by Bessel vortex beam consists of two pairs of OAM-free axial (Gaussian-like) beam and the conical (Bessel-like) beam, the OAM of which is equal to OAM of pump beam. Hence, the OAM is conserved within the spontaneous parametric down-conversion of higher-order Bessel beams in contrary to OPG pumped by Laguerre-Gaussian modes. That is the result of strong transverse selection of spontaneously arising fields in OPG pumped by Bessel beams.
Keywords :
laser beams; optical frequency conversion; optical pumping; optical vortices; Bessel beam; Bessel-like beam; CDA-based OPG; Gaussian-like beam; OAM-free axial beam; conical beam; higher-order Bessel beams; optical parametric generators; orbital angular momentum; parametric downconversion; pump beam; quadratic medium; spontaneous downconversion; vortex beam; Laser beams; Laser excitation; Laser mode locking; Laser tuning; Nonlinear optics; Optical diffraction; Optical pumping; Optical vortices; Ring lasers; Stimulated emission;
Conference_Titel :
Quantum Electronics Conference, 2005. EQEC '05. European
Print_ISBN :
0-7803-8973-5
DOI :
10.1109/EQEC.2005.1567226
