Improved fourth harmonic generation in β-BaB2O4 by tight elliptical focusing perpendicular to walk-off plane

被引：17

作者：

Takahashi, Masakuni ^{[1
]}

Osada, Akira ^{[1
]}

Dergachev, Alex ^{[2
]}

Moulton, Peter F. ^{[2
]}

Cadatal-Raduban, Marilou ^{[3
]}

Shimizu, Toshihiko ^{[3
]}

Sarukura, Nobuhiko ^{[3
]}

机构：

[1] Mitsubishi Mat Corp, Cent Res Inst, Naka, Ibaraki 3110102, Japan

[2] Q Peak Inc, Bedford, MA 01730 USA

[3] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan

来源：

JOURNAL OF CRYSTAL GROWTH | 2011年 / 318卷 / 01期

关键词：

Frequency conversion; UV generation; Borates; Nonlinear optic materials; NM;

D O I：

10.1016/j.jcrysgro.2010.10.082

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

We present a scheme using beta-barium borate (BBO) crystal to maximize fourth-harmonic ultraviolet (UV) generation from high-power, kHz-range repetition rate Nd lasers by reducing thermal dephasing during the phase matching process. Thermal dephasing due to nonlinear absorption (NLA) induced by two-photon absorption of high peak power fourth-harmonic UV radiation is reduced by minimizing second- and fourth-harmonic beam overlap through tight elliptical focusing perpendicular to the walk-off plane, leading to multi-watt, kHz-range repetition rate UV generation in BBO crystal. With such beam shaping, nearly 5W at 10 kHz of 262-nm UV radiation is generated using an 8-mm long BBO crystal. The results of our investigation show an efficient way of achieving multi-watt UV generation at kHz-range repetition rate. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：606 / 609

页数：4