Tailorable Brillouin Light Scattering in a Lithium Niobate Waveguide

Applied Sciences

Yu Yu¹  Yunfei Li¹  Kai Li¹  Zhiyong Wang¹  Zhiwei Lu¹  Yulei Wang¹  Zhenxu Bai¹  Gong Wang¹  Changyu Song¹  Wuyue Wang¹  Tongyu Liu²  Xiusheng Yan²  Yuhai Li²  Sensen Li² 

[1] Center for Advanced Laser Technology, Hebei University of Technology, Tianjin 300401, China;Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin 300308, China;

关键词: stimulated Brillouin scattering;    lithium niobate;    tunable phonon frequency;   

DOI  :  10.3390/app11188390

来源: DOAJ

【 摘 要 】

Stimulated Brillouin scattering (SBS) lasers based on silicon waveguides with large SBS gain have been widely used in frequency tunable laser emissions, mode-locked pulse lasers, low-noise oscillators, optical gyroscopes and other fields. However, among SBS lasers, the realization of Brillouin laser output often requires a longer waveguide length, which not only increases waveguide loss but also increase the size of the device. As a new medium, lithium niobate has been fabricated into a new type of hybrid structure. Meanwhile, the width of a suspended waveguide is adjusted to tune the phonon frequency of an SBS laser based on lithium niobate substrate. Simulation results show that the tunable forward SBS effect is realized in a lithium niobate-suspended optical waveguide, showing a larger forward stimulated Brillouin scattering gain of 0.31 W⁻¹m⁻¹. The tunable phonon frequency ranges from 1 to 15 GHz. Therefore, utilizing the photon–phonon conversion effect, the waveguide system with LiNbO₃ will pave a new way forward with better integration.

【 授权许可】

Unknown