Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal  

作　　者：Zhen Hao Biqiang Jiang Yuxin Ma Ruixuan Yi Xuetao Gan Jianlin Zhao 

机构地区：[1]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

出　　处：《Opto-Electronic Advances》2023年第9期59-68,共10页光电进展（英文）

基　　金：supports from National Natural Science Foundation of China(No.61975166,11634010);Key Research and Development Program(No.2017YFA0303800).

摘　　要：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.

关 键 词：nonlinear optics second-harmonic generation continuous wave pump high efficiency multi-frequencies mixing broad spectra MICROFIBERS gallium selenide 

分 类 号：TN2[电子电信—物理电子学]