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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 | Source: | Scientific reports, 23 2017, v. 7, no. , 9224, p. 1-8 | 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. | Publisher: | Nature Publishing Group | Journal: | Scientific reports | ISSN: | 2045-2322 | EISSN: | 2045-2322 | DOI: | 10.1038/s41598-017-10028-3 | Rights: | Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2017 The following publication Yuan, J., Kang, Z., Li, F. et al. Deep-ultraviolet second-harmonic generation by combined degenerate four-wave mixing and surface nonlinearity polarization in photonic crystal fiber. Sci Rep 7, 9224 (2017) is available at https://dx.doi.org/10.1038/s41598-017-10028-3 |
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