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
收藏
页码：606 / 609
页数：4
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