Two-dimensional modeling of transient gain gratings in saturable gain media

Abstract

A transient two-dimensional model describing degenerate four-wave mixing inside saturable gain media is presented. The new model is compared to existing one-dimensional models with their qualitative results confirmed. Large quantitative differences with respect to peak reflectivity and optimum pump fluence are observed. Furthermore, the influence of the beam focus size, the transverse position and the crossing angle on the reflectivity of the grating is investigated using the improved model. It is demonstrated that the phase conjugate reflectivity depends sensitively on the transverse features of the interacting beams with a transverse shift in the position of the pump beams yielding a threefold improvement in reflectivity.

Brillouin Scattering in Optical Fibers and Its Application to Distributed Sensors

“…Dynamic grating can be generated by use of gain saturation effect in rare-earth-metal-doped optical fibers [85][86][87] or stimulated Brillouin scattering (SBS) process in optical fibers [88][89][90][91][92][93] and even in a photonic chip [94]. Dynamic grating is more advantageous for certain applications than fiber Bragg grating (FBG) [95] because it can be dynamically constructed using two coherent pump waves while FBG is static after fabrication.…”

Spectral Analysis of Brillouin Dynamic Grating Based on Heterodyne Detection

“…ynamic grating can be generated by the use of gain saturation effect in rare-earth-metal-doped optical fibers [1][2][3] or stimulated Brillouin scattering (SBS) process in optical fibers. [4][5][6][7][8][9][10] Dynamic grating is more advantageous for certain applications than fiber Bragg grating (FBG) 11) because it can be dynamically constructed using two coherent pump waves while FBG is static after fabrication.…”