Author Affiliations
Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
The conversion-efficiency for second-harmonic (SH) in optical fibers is significantly limited by extremely weak second-order nonlinearity of fused silica, and pulse pump lasers with high peak power are widely employed. Here, we propose a simple strategy to efficiently realize the broadband and continuous wave (CW) pumped SH, by transferring a crystalline GaSe coating onto a microfiber with phase-matching diameter. In the experiment, high efficiency up to 0.08 %W-1mm-1 is reached for a C-band pump laser. The high enough efficiency not only guarantees SH at a single frequency pumped by a CW laser, but also multi-frequencies mixing supported by three CW light sources. Moreover, broadband SH spectrum is also achieved under the pump of a superluminescent light-emitting diode source with a 79.3 nm bandwidth. The proposed scheme provides a beneficial method to the enhancement of various nonlinear parameter processes, development of quasi-monochromatic or broadband CW light sources at new wavelength regions.
nonlinear optics second-harmonic generation continuous wave pump high efficiency multi-frequencies mixing broad spectra microfibers gallium selenide 
Opto-Electronic Advances
2023, 6(9): 230012
1 华东师范大学 纳光电集成与先进装备教育部工程研究中心,极化材料与器件教育部重点实验室,上海 00241
2 中国科学院上海技术物理研究所红外物理国家重点实验室,上海 200083
铜铟镓硒(Cu(In,Ga)Se2,CIGS)太阳电池 组分梯度 碱金属 无镉缓冲层 产业化 叠层 copper indium gallium selenide(Cu(In,Ga)Se2,CIGS)solar cell component gradient alkali metal cd-free buffer layer industrialization tandem 
2022, 41(2): 395

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