Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal
층상 GaSe 결정 포복 마이크로섬유 광대역 연속파 펌프 2차 고조파 발생
Los cristales de gase en capas recubiertos de microfibras producen armónicos secundarios bombeados por ondas continuas de banda ancha
Les microfibres recouvertes de cristaux lamellaires de gase produisent des deuxièmes harmoniques pompées en ondes continues à large bande
Слоистый кристалл GaSe, покрытый микроволокном, генерирует вторичную гармонику широкополосной непрерывной накачки
Zhen Hao 郝臻, Biqiang Jiang 姜碧强, Yuxin Ma 马育新, Ruixuan Yi 弋瑞轩, Xuetao Gan 甘雪涛, Jianlin Zhao 赵建林
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
中国 西安 西北工业大学物理科学与技术学院 陕西省信息光子技术重点实验室 光场调控与信息感知工业和信息化部重点实验室
Opto-Electronic Advances, 27 September 2023

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.
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