分类： 光学 >> 量子光学 提交时间： 2023-02-19
Zhiquan Yuan
Heming Wang
Peng Liu
Bohan Li
Boqiang Shen
Maodong Gao
Lin Chang
Warren Jin
Avi Feshali
Mario Paniccia
John Bowers
Kerry Vahala
摘要： Narrow-linewidth lasers are important to many applications spanning precision metrology to sensing systems. Characterization of these lasers requires precise measurements of their frequency noise spectra. Here we demonstrate a correlated self-heterodyne (COSH) method capable of measuring frequency noise as low as 0.01 Hz$^2$/Hz at 1 MHz offset frequency. The measurement setup is characterized by both commercial and lab-built lasers, and features low optical power requirements, fast acquisition time and high intensity noise rejection.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Jingwei Ling
Jeremy Staffa
Heming Wang
Boqiang Shen
Lin Chang
Usman A. Javid
Lue Wu
Zhiquan Yuan
Raymond Lopez-Rios
Mingxiao Li
Yang He
Bohan Li
John E. Bowers
Kerry J. Vahala
Qiang Lin
摘要： 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 is an impediment to their transitioning beyond the laboratory. Here, a system-on-a-chip that emits high-coherence visible and 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 in a single nonlinear resonator. This simplified approach is demonstrated in a hybridly-integrated device and provides a short-term linewidth around 10-30 kHz. On-chip, converted optical power over 2 mW is also obtained. Moreover, measurements show that heterogeneous integration can result in conversion efficiency higher than 25% with 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.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Qing-Xin Ji
Warren Jin
Lue Wu
Yan Yu
Zhiquan Yuan
Wei Zhang
Maodong Gao
Bohan Li
Heming Wang
Chao Xiang
Joel Guo
Avi Feshali
Mario Paniccia
Vladimir S. Ilchenko
Andrey B. Matsko
John Bowers
Kerry Vahala
摘要： Normal group velocity dispersion (GVD) microcombs offer high comb line power and high pumping efficiency compared to bright pulse microcombs. The recent demonstration of normal GVD microcombs using CMOS-foundry-produced microresonators is an important step towards scalable production. However, the chromatic dispersion of CMOS devices is large and impairs generation of broadband microcombs. Here, we report the development of a microresonator in which GVD is reduced due to a couple-ring resonator configuration. Operating in the turnkey self-injection-locking mode, the resonator is hybridly integrated with a semiconductor laser pump to produce high-power-efficiency combs spanning a bandwidth of 9.9 nm (1.22 THz) centered at 1560 nm, corresponding to 62 comb lines. Fast, linear optical sampling of the comb waveform is used to observe the rich set of near-zero GVD comb behaviors, including soliton molecules, switching waves (platicons) and their hybrids. Tuning of the 20 GHz repetition rate by electrical actuation enables servo locking to a microwave reference, which simultaneously stabilizes the comb repetition rate, offset frequency and temporal waveform. This hybridly integrated system could be used in coherent communications or for ultra-stable microwave signal generation by two-point optical frequency division.
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