期刊
LASER & PHOTONICS REVIEWS
卷 17, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202200663
关键词
integrated photonics; second harmonic generation; self-injection locking
Researchers have demonstrated a system-on-chip that emits high-coherence near-visible lightwaves. The chip combines wavelength conversion with self-injection locking within a single nonlinear resonator, providing a short-term linewidth of around 4.7 kHz and on-chip optical power over 2 mW. Heterogeneous integration shows conversion efficiency higher than 25% and output power over 11 mW. This approach can be scaled for low-cost manufacturing of high-coherence visible emitters and can be applied to other frequency conversion processes.
High-coherence visible and near-visible laser sources are centrally important to the operation of advanced position/navigation/timing systems as well as classical/quantum sensing systems. However, the complexity and size of these bench-top lasers are an impediment to their transition beyond the laboratory. Here, a system-on-chip that emits high-coherence near-visible lightwaves is demonstrated. The devices rely upon a new approach wherein wavelength conversion and coherence increase by self-injection locking are combined within a single nonlinear resonator. This simplified approach is demonstrated in a hybridly-integrated device and provides a short-term linewidth of around 4.7 kHz (10 kHz before filtering). On-chip converted optical power over 2 mW is also obtained. Moreover, measurements show that heterogeneous integration can result in a conversion efficiency higher than 25% with an output power over 11 mW. Because the approach uses mature III-V pump lasers in combination with thin-film lithium niobate, it can be scaled for low-cost manufacturing of high-coherence visible emitters. Also, the coherence generation process can be transferred to other frequency conversion processes, including optical parametric oscillation, sum/difference frequency generation, and third-harmonic generation.
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