Design and fabrication of 780nm Fabry-Perot and distributed-feedback laser towards narrow linewidth

Yanhu Zhang; Xinlun Cai; Bing Wang; Siyuan Yu

doi:10.1117/12.3023619

18 March 2024 Design and fabrication of 780nm Fabry-Perot and distributed-feedback laser towards narrow linewidth

Yanhu Zhang, Xinlun Cai, Bing Wang, Siyuan Yu

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131044M (2024) https://doi.org/10.1117/12.3023619
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

Cold atoms have important applications in high-precision metrology, sensing, navigation, etc. Laser cooling is crucial to acquire cold atoms^[1-2]. In particular, 780 nm narrow linewidth laser is a key enabling factor for cold Rb atoms. The linewidth of the 780nm laser should be below 1 MHz to exactly match the energy levels of Rb atoms. This far exceeds the linewidth limit of Fabry-Perot (FP) lasers. Distributed Feedback (DFB) lasers exhibit much narrower linewidths compared to FP lasers^[3]. However, the period of the grating for a 780nm DFB laser is much smaller than the period of the gratings of DFB lasers working at longer wavelength, e.g. at telecommunication wavelength. This presents a significant challenge in manufacturing 780nm DFB lasers^[4]. In this work we designed a 780nm DFB laser having a sidewall grating with a period of 360nm, a duty cycle of 50%, an etching depth of 550nm, and a ridge waveguide width of 1.2μm. The laser’s epitaxial layer’s fundamental properties were verified by a 780nm FP laser, with a 110mW single-sided output power. The DFB’s grating was fabricated by electron-beam lithography (EBL) and Inductively Coupled Plasma (ICP) etching. Ultimately, our goal is to achieve a DFB laser with a linewidth below 1 MHz.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yanhu Zhang, Xinlun Cai, Bing Wang, and Siyuan Yu "Design and fabrication of 780nm Fabry-Perot and distributed-feedback laser towards narrow linewidth", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131044M (18 March 2024); https://doi.org/10.1117/12.3023619

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