TY - JOUR
T1 - Generation of Second-Harmonics Near Ultraviolet Wavelengths From Femtosecond Pump Pulses
AU - Yuan, Jinhui
AU - Sang, Xinzhu
AU - Wu, Qiang
AU - Zhou, Guiyao
AU - Li, Feng
AU - Yu, Chongxiu
AU - Wang, Kuiru
AU - Yan, Binbin
AU - Han, Ying
AU - Tam, Hwa Yaw
AU - Wai, P. K. A.
PY - 2016/8/15
Y1 - 2016/8/15
N2 - Second-harmonic generation (SHG) near ultraviolet wavelengths is experimentally demonstrated by coupling femtosecond pump pulses into the normal dispersion region far away from the zero-dispersion wavelength of the fundamental mode in a silica photonic crystal fiber (PCF) fabricated in our laboratory. When the pump pulses with average input power Pav of 500 mW and center wavelength λp of 820 nm are used, the maximum conversion efficiency ηSH of the second harmonics centered at 410 nm can be up to 1.6 × 10-6, corresponding to the output power PSH of 520 nW. By measuring PSH at different PCF lengths and studying the temporal dependence of SH, it is confirmed that the physical mechanism of SHG is dominated by surface nonlinearity polarization, which is resulted from the local inhomogeneities in the silica core region and at the coreair-silica cladding interface of PCF. Finally, a theoretical model is established to analyze the nonlinear optical process.
AB - Second-harmonic generation (SHG) near ultraviolet wavelengths is experimentally demonstrated by coupling femtosecond pump pulses into the normal dispersion region far away from the zero-dispersion wavelength of the fundamental mode in a silica photonic crystal fiber (PCF) fabricated in our laboratory. When the pump pulses with average input power Pav of 500 mW and center wavelength λp of 820 nm are used, the maximum conversion efficiency ηSH of the second harmonics centered at 410 nm can be up to 1.6 × 10-6, corresponding to the output power PSH of 520 nW. By measuring PSH at different PCF lengths and studying the temporal dependence of SH, it is confirmed that the physical mechanism of SHG is dominated by surface nonlinearity polarization, which is resulted from the local inhomogeneities in the silica core region and at the coreair-silica cladding interface of PCF. Finally, a theoretical model is established to analyze the nonlinear optical process.
KW - Photonic crystal fiber (PCF)
KW - second-harmonic generation (SHG)
KW - surface nonlinearity polarization
UR - https://www.scopus.com/pages/publications/84976559385
U2 - 10.1109/LPT.2016.2530744
DO - 10.1109/LPT.2016.2530744
M3 - Article
SN - 1041-1135
VL - 28
SP - 1719
EP - 1722
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 16
ER -