Generation of Second-Harmonics Near Ultraviolet Wavelengths From Femtosecond Pump Pulses

Yuan, Jinhui, Sang, Xinzhu, Wu, Qiang, Zhou, Guiyao, Li, Feng, Yu, Chongxiu, Wang, Kuiru, Yan, Binbin, Han, Ying, Tam, Hwa Yaw and Wai, Ping-kong Alexander (2016) Generation of Second-Harmonics Near Ultraviolet Wavelengths From Femtosecond Pump Pulses. IEEE Photonics Technology Letters, 28 (16). pp. 1719-1722. ISSN 1041-1135

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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.

Item Type: Article
Uncontrolled Keywords: Photonic crystal fiber (PCF), second-harmonic generation (SHG), surface nonlinearity polarization
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 15 Jul 2016 11:01
Last Modified: 12 Oct 2019 19:21

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