Cascaded third-harmonic generation of ultrashort optical pulses in two-dimensional quasi-phase-matching gratings

作     者：Fujioka, Nobuhide Ashihara, Satoshi Ono, Hidenobu Shimura, Tsutomu Kuroda, Kazuo 

作者机构：Tokyo Univ Agr & Technol Dept Appl Phys Koganei Tokyo 1848588 Japan Univ Tokyo Inst Ind Sci Meguro Ku Tokyo 1538505 Japan Japan Sci & Technol Corp PRESTO Kawaguchi Shi Saitama 3320012 Japan 

出 版 物：《JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS》 (美国光学会志，B辑：光物理学)

年 卷 期：2007年第24卷第9期

页      面：2394-2405页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：POLED LITHIUM-NIOBATE NONLINEAR PHOTONIC CRYSTALS LIMITED FUNDAMENTALPULSES SAPPHIRE LASER-PULSES 2ND-HARMONIC GENERATION FEMTOSECOND PULSES QUADRATICNONLINEARITIES HARMONIC-GENERATION SINGLE-SOURCE WAVE-GUIDES 

摘      要：Cascaded third-harmonic generation (THG) of femtosecond pulses in a two-dimensional periodically poled lithium niobate is demonstrated experimentally. The poling pattern satisfies quasi-phase-matching conditions for both second-harmonic generation (SHG) and the following sum-frequency generation. The pulse-front tilt in noncollinear interactions compensates for group-velocity mismatch among fundamental, second-harmonic (SH), and third-harmonic (TH) pulses, thereby achieving broad acceptance bandwidths in SHG and THG. A 2 mm thick device generates SH and TH pulses of 106 and 110 fs, respectively, from fundamental pulses with temporal duration of 118 fs and a 1568 nm center wavelength. The frequency conversion properties are studied theoretically, and the optimal focusing condition for maximum conversion efficiency is derived. (c) 2007 Optical Society of America.