TY - JOUR
T1 - Deep-ultraviolet second harmonic generation by combined degenerate four-wave mixing and surface nonlinearity polarization on photonic crystal fiber
AU - Jinhui, Yuan
AU - Kang, Zhe
AU - Li, Feng
AU - Zhou, Guiyao
AU - Zhang, Xianting
AU - Mei, Chao
AU - Sang, Xinzhu
AU - Wu, Qiang
AU - Yan, Binbin
AU - Zhou, Xian
AU - Zhong, Kangping
AU - Wang, Kuiru
AU - Yu, Chongxiu
AU - Chao, Lu
AU - Tam, Hwayaw
AU - Wai, Ping Kong Alexander
PY - 2017/8/2
Y1 - 2017/8/2
N2 - 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 λ 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.
AB - 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 λ 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.
U2 - 10.1038/s41598-017-10028-3
DO - 10.1038/s41598-017-10028-3
M3 - Journal article
SN - 2045-2322
VL - 7
JO - Scientific Reports
JF - Scientific Reports
M1 - 9224
ER -