Investigation of thermally-induced phase mismatching in continuous-wave second harmonic generation: A theoretical model

被引：35

作者：

Sabaeian, Mohammad ^{[1
]}

Mousave, Laleh ^{[2
]}

Nadgaran, Hamid ^{[3
]}

机构：

[1] Shahid Chamran Univ Ahvaz, Dept Phys, Fac Sci, Ahvaz, Iran

[2] Islamic Azad Univ, Dept Phys, Dezful Branch, Dezful, Iran

[3] Shiraz Univ, Coll Sci, Dept Phys, Shiraz 71454, Iran

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 18期

关键词：

POWER; COMPENSATION; CRYSTALS; KTIOPO4; LIGHT;

D O I：

10.1364/OE.18.018732

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A fraction of the fundamental beam energy deposited into nonlinear crystals to generate second harmonic waves (SHW) causes a temperature gradient within the crystal. This temperature inhomogeneity can alter the refractive index of the medium leading to a well-known effect called thermal dispersion. Therefore, the generated SHW suffers from thermal lensing and a longitudinal thermal phase mismatching. In this work by coupling the heat equation with second harmonic generation (SHG) formalism applied to type-II configuration along with walk-off effect, we investigate the continuous wave (CW) SHW beam profile and conversion efficiency when a non-linear KTP crystal is under induced thermal load. We have demonstrated for average and high powers, the thermal de-phasing lead to considerable reduction in SHG compared to an ideal case in which induced heat is neglected. (C) 2010 Optical Society of America

引用

页码：18732 / 18743

页数：12