Abstract
The stabilization and manipulation of laser frequency by means of an external cavity are nearly ubiquitously used in fundamental research and laser applications. While most of the laser light transmits through the cavity, in the presence of some back-scattered light from the cavity to the laser, the self-injection locking effect can take place, which locks the laser emission frequency to the cavity mode of similar frequency. The self-injection locking leads to dramatic reduction of laser linewidth and noise. Using this approach, a common semiconductor laser locked to an ultrahigh-Q microresonator can obtain sub-Hertz linewidth, on par with state-of-the-art fiber lasers. Therefore it paves the way to manufacture high-performance semiconductor lasers with reduced footprint and cost. Moreover, with high laser power, the optical nonlinearity of the microresonator drastically changes the laser dynamics, offering routes for simultaneous pulse and frequency comb generation in the same microresonator. Particularly, integrated photonics technology, enabling components fabricated via semiconductor CMOS process, has brought increasing and extending interest to laser manufacturing using this method. In this article, we present a comprehensive tutorial on analytical and numerical methods of laser self-injection locking, as well a review of most recent theoretical and experimental achievements.
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Acknowledgements
The authors are grateful for the fruitful discussion and collaboration with colleagues at EPFL, UCSB, Caltech, Purdue, and OEWaves, during and especially prior to the preparation of this review.
Funding
The results presented in Sections 2.5 and 3.2 were obtained with the support of the Russian Science Foundation (project 22-22-00872). The results presented in Sections 2.3, 3.4 and 4 were obtained with the support of the Russian Science Foundation (Project 20-12-00344). Y.-H. L. acknowledges support from the China Postdoctoral Science Foundation (Grant No. 2022M721482). W. L. acknowledges support from the National Natural Science Foundation of China (Grant No. 62075233) and the CAS Project for Young Scientists in Basic Research (Grant No. YSBR-69). J. L. acknowledges support from the National Natural Science Foundation of China (Grant No.12261131503), Shenzhen—Hong Kong Cooperation Zone for Technology and Innovation (HZQB-KCZYB2020050), and from the Guangdong Provincial Key Laboratory (2019B121203002).
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N.M.K., V.E.L., I.A.B., and J.L. contributed to conception and organization of the manuscript. N.M.K., V.E.L., W.L., J.L. and I.A.B. wrote the introduction. N.M.K., R.R.G., V.E.L., and D.A.C. organized and wrote the theoretical review part. A. E.S., D.A.C., N.Y.D., A.N.D., E.A.L., Y.-H.L., W.L., and J.L. organized and wrote the experimental review part. All authors contributed to manuscript revision, read, and approved the submitted version.
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All original data used in this review are available from the corresponding authors upon reasonable request.
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Kondratiev, N.M., Lobanov, V.E., Shitikov, A.E. et al. Recent advances in laser self-injection locking to high-Q microresonators. Front. Phys. 18, 21305 (2023). https://doi.org/10.1007/s11467-022-1245-3
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DOI: https://doi.org/10.1007/s11467-022-1245-3