Deep-ultraviolet second-harmonic generation by combined degenerate four-wave mixing and surface nonlinearity polarization in photonic crystal fiber

Jinhui Yuan, Zhe Kang, Feng Li, Guiyao Zhou, Xianting Zhang, Chao Mei, Xinzhu Sang, Qiang Wu, Binbin Yan, Xian Zhou, Kangping Zhong, Kuiru Wang, Chongxiu Yu, Chao Lu, Hwa Yaw Tam, P. K. A. Wai

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Abstract

Deep-ultraviolet (UV) second-harmonics (SHs) have important applications in basic physics and applied sciences. However, it still remains challenging to generate deep-UV SHs especially in optical fibers. Here, for the first time, we experimentally demonstrate the deep-UV SH generations (SHGs) by combined degenerate four-wave mixing (FWM) and surface nonlinearity polarization in an in-house designed and fabricated air-silica photonic crystal fiber (PCF). When femtosecond pump pulses with average input power Pav of 650 mW and center wavelength λp of 810, 820, 830, and 840 nm are coupled into the normal dispersion region close to the zero-dispersion wavelength of the fundamental mode of the PCF, the anti-Stokes waves induced by degenerate FWM process are tunable from 669 to 612 nm. Then, they serve as the secondary pump, and deep-UV SHs are generated within the wavelength range of 334.5 to 306 nm as a result of surface nonlinearity polarization at the core-cladding interface of the PCF. The physical mechanism of the SHGs is confirmed by studying the dependences of the output power PSH of the SHs on the PCF length and time. Finally, we also establish a theoretical model to analyze the SHGs.
Original languageEnglish
Pages (from-to)9224
JournalScientific Reports
Volume7
Early online date23 Aug 2017
DOIs
Publication statusE-pub ahead of print - 23 Aug 2017

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