Near-resonant high order nonlinear absorption of ZnO thin films

被引：44
作者：
Chan, Yun-Pei [1 ,2 ]
Lin, Ja-Hon [3 ]
Hsu, Chih-Chang [1 ,2 ]
Hsieh, Wen-Feng [1 ,2 ]
机构：
[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30050, Taiwan
[2] Natl Chiao Tung Univ, Inst Electroopt Engn, Hsinchu 30050, Taiwan
[3] Natl Taipei Univ Technol, Dept Electroopt Engn, Taipei 10608, Taiwan
来源：
OPTICS EXPRESS | 2008年 / 16卷 / 24期
关键词：
D O I：
10.1364/OE.16.019900
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Nonlinear optical absorption of ZnO thin film grown by the laser molecular beam epitaxy was investigated by the Z-scan method using a frequency-doubled femtosecond Ti:sapphire laser. Due to near-exciton resonance, an enormous enhancement of two photon absorption (TPA) is about 3000 cm/GW at 390 nm which is about 6.5 times larger than the previously reported at two-photon exciton resonance in near-IR regime and 710 times larger than that of ZnO bulk measured at 532 nm. Besides, the free-carrier absorption resulting from linear absorption and TPA becomes essential when the excitation approaches the exciton resonance. (C) 2008 Optical Society of America
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收藏
页码：19900 / 19908
页数：9
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