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Updated: Jul 4, 2026
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Non-collinear quasi phase matching and annular profiles in difference frequency generation with focused Gaussian
P Malara1, P Maddaloni, G Mincuzzi
1Consiglio Nazionale delle Ricerche - Istituto Nazionale di Ottica Applicata and European Laboratory for Nonlinear Spectroscopy (LENS), Comprensorio A. Olivetti, Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy. pietro.malara@inoa.it
Abstract:
We present and experimentally test a simple model for difference frequency generation (DFG) in periodically-poled crystals with gaussian pumping beams. Focusing of input beams originates several non-collinear quasi-phase-matching configurations of the interacting wavevectors, which contribute to the idler output field. In this picture, we accurately describe a number of effects, such as the occurrence of annular idler intensity profiles and the asymmetric trend of DFG power vs temperature. Finally, we quantitatively test the model by means of an indirect measurement of the crystal poling period.
