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

Authors :
Xinzhu Sang
Jinhui Yuan
Binbin Yan
Chongxiu Yu
Qiang Wu
Ping Kong Alexander Wai
Ying Han
Kuiru Wang
Guiyao Zhou
Hwa Yaw Tam
Feng Li
Source :
IEEE Photonics Technology Letters. 28:1719-1722
Publication Year :
2016
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2016.

Abstract

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 $P_{\mathrm {av}}$ of 500 mW and center wavelength $\lambda _{\mathrm {p}}$ of 820 nm are used, the maximum conversion efficiency $\eta _{\mathrm {SH}} ^{^{^{}}}$ of the second harmonics centered at 410 nm can be up to $1.6\times 10^{-6}$ , corresponding to the output power $P_{\mathrm {SH}}$ of 520 nW. By measuring $P_{\mathrm {SH}}$ at different PCF lengths and studying the temporal dependence of $P_{\mathrm {SH}}$ , 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 core-air-silica cladding interface of PCF. Finally, a theoretical model is established to analyze the nonlinear optical process.

Details

ISSN :
19410174 and 10411135
Volume :
28
Database :
OpenAIRE
Journal :
IEEE Photonics Technology Letters
Accession number :
edsair.doi...........c44bc496082ae5095454eae436ed08ae
Full Text :
https://doi.org/10.1109/lpt.2016.2530744