Chauhan Nitesh, Isichenko Andrei, Liu Kaikai, Wang Jiawei, Zhao Qiancheng, Behunin Ryan O, Rakich Peter T, Jayich Andrew M, Fertig C, Hoyt C W, Blumenthal Daniel J
Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA, USA.
Department of Applied Physics and Materials Science, Northern Arizona University, Flagstaff, AZ, USA.
Nat Commun. 2021 Aug 3;12(1):4685. doi: 10.1038/s41467-021-24926-8.
Narrow linewidth visible light lasers are critical for atomic, molecular and optical (AMO) physics including atomic clocks, quantum computing, atomic and molecular spectroscopy, and sensing. Stimulated Brillouin scattering (SBS) is a promising approach to realize highly coherent on-chip visible light laser emission. Here we report demonstration of a visible light photonic integrated Brillouin laser, with emission at 674 nm, a 14.7 mW optical threshold, corresponding to a threshold density of 4.92 mW μm, and a 269 Hz linewidth. Significant advances in visible light silicon nitride/silica all-waveguide resonators are achieved to overcome barriers to SBS in the visible, including 1 dB/meter waveguide losses, 55.4 million quality factor (Q), and measurement of the 25.110 GHz Stokes frequency shift and 290 MHz gain bandwidth. This advancement in integrated ultra-narrow linewidth visible wavelength SBS lasers opens the door to compact quantum and atomic systems and implementation of increasingly complex AMO based physics and experiments.
窄线宽可见光激光器对于包括原子钟、量子计算、原子和分子光谱以及传感在内的原子、分子和光学（AMO）物理领域至关重要。受激布里渊散射（SBS）是实现高度相干片上可见光激光发射的一种很有前景的方法。在此，我们报告了一种可见光光子集成布里渊激光器的演示，其发射波长为674nm，光学阈值为14.7mW，对应阈值密度为4.92mW/μm，线宽为269Hz。在可见光氮化硅/二氧化硅全波导谐振器方面取得了重大进展，以克服可见光中SBS的障碍，包括1dB/米的波导损耗、5540万的品质因数（Q），以及对25.110GHz斯托克斯频移和290MHz增益带宽的测量。集成超窄线宽可见波长SBS激光器的这一进展为紧凑型量子和原子系统以及越来越复杂的基于AMO的物理和实验的实现打开了大门。
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