Enhancement of quasi-phase-matched second harmonic generation with use of photonic band structure by optimizing densities of light mode

Minamiguchi, Masaru; Ashida, Masaaki; Itoh, Tadashi

doi:10.1364/nlo.2004.wa4

Cited by 1 publication

(1 citation statement)

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“…Among various kinds of problems for this interaction the frequency conversion, in particular a second harmonic generation (SHG) in PC, is very attractive problem [1][2][3][4][5][6][7] as well as the ways of its enhancement [8][9][10][11][12][13][14][15][16][17][18]. On the other hand, the low efficient SHG, named as cascading SHG, is also of great interest in a homogeneous medium.…”

Section: Introductionmentioning

confidence: 99%

Two waves interaction in layered photonic structure at big phase mismatching

Trofimov

Lysak

2011

SPIE Proceedings

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Self-focusing of optical Gaussian pulse with the axial-symmetric profile of the beam due to cascading SHG at the big phase mismatch in the layered photonic crystal is considered. We show the possibility of strong self-focusing of the optical radiation in such conditions: a maximum intensity increases 70 (and more) times in comparison with the intensity of incident optical beam. Gaussian profiles of beam and Gaussian shape of pulse are preserved with sufficient good accuracy in the section of first or second nonlinear focus realization. These characteristics of optical radiation remain the same after leaving the pulse of the photonic crystal. For corresponding choice of interaction parameters the losses of energy at fundamental wave because of its conversion to the wave with double frequency is less than 5%. An influence of the incident intensity of laser pulse and the crystal length on the process of self-focusing is investigated also.

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