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Title: Deep-ultraviolet second-harmonic generation by combined degenerate four-wave mixing and surface nonlinearity polarization in photonic crystal fiber
Authors: Yuan, JH 
Kang, Z 
Li, F 
Zhou, GY
Zhang, XT 
Mei, C
Sang, XZ
Wu, Q
Yan, BB
Zhou, X 
Zhong, KP 
Wang, KR
Yu, CX
Lu, C 
Tam, HY 
Wai, PKA 
Issue Date: 2017
Publisher: Nature Publishing Group
Source: Scientific reports, 2017, v. 7, 9224 How to cite?
Journal: Scientific reports 
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 P-av of 650 mW and center wavelength lambda(p) 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 P-SH of the SHs on the PCF length and time. Finally, we also establish a theoretical model to analyze the SHGs.
ISSN: 2045-2322
EISSN: 2045-2322
DOI: 10.1038/s41598-017-10028-3
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