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Low-Pump-Power, Low-Phase-Noise, and Microwave to Millimeter-Wave Repetition Rate Operation in Microcombs

Li, Jiang and Lee, Hansuek and Chen, Tong and Vahala, Kerry J. (2012) Low-Pump-Power, Low-Phase-Noise, and Microwave to Millimeter-Wave Repetition Rate Operation in Microcombs. Physical Review Letters, 109 (23). Art. No. 233901 . ISSN 0031-9007. doi:10.1103/PhysRevLett.109.233901.

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Microresonator-based frequency combs (microcombs or Kerr combs) can potentially miniaturize the numerous applications of conventional frequency combs. A priority is the realization of broadband (ideally octave spanning) spectra at detectable repetition rates for comb self-referencing. However, access to these rates involves pumping larger mode volumes and hence higher threshold powers. Moreover, threshold power sets both the scale for power per comb tooth and also the optical pump. Along these lines, it is shown that a class of resonators having surface-loss-limited Q factors can operate over a wide range of repetition rates with minimal variation in threshold power. A new, surface-loss-limited resonator illustrates the idea. Comb generation on mode spacings ranging from 2.6 to 220 GHz with overall low threshold power (as low as 1 mW) is demonstrated. A record number of comb lines for a microcomb (around 1900) is also observed with pump power of 200 mW. The ability to engineer a wide range of repetition rates with these devices is also used to investigate a recently observed mechanism in microcombs associated with dispersion of subcomb offset frequencies. We observe high-coherence phase locking in cases where these offset frequencies are small enough so as to be tuned into coincidence. In these cases, a record-low microcomb phase noise is reported at a level comparable to an open-loop, high-performance microwave oscillator.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle Paper
Lee, Hansuek0000-0002-0748-7662
Vahala, Kerry J.0000-0003-1783-1380
Additional Information:© 2012 American Physical Sociey. Received 2 June 2012; revised manuscript received 24 August 2012; published 4 December 2012. The authors thank Scott Diddams and Scott Papp for helpful discussions, and also are grateful for financial support under the DARPA QuASAR program. Also, the authors thank the Kavli Nanoscience Institute and NASA.
Group:Institute for Quantum Information and Matter, Kavli Nanoscience Institute
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Kavli Nanoscience InstituteUNSPECIFIED
Issue or Number:23
Classification Code:PACS: 42.65.Ky, 42.62.Eh, 42.65.Hw
Record Number:CaltechAUTHORS:20130110-084223375
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36290
Deposited By: Tony Diaz
Deposited On:11 Jan 2013 21:51
Last Modified:09 Nov 2021 23:21

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