Author Affiliations

William Groman,^1,2 Igor Kudelin,^1,2 Qing-Xin Ji,³ Joel Guo,⁴ Dahyeon Lee,^1,2 Megan Kelleher,^1,2 Takuma Nakamura,^1,2 Charles A. McLemore,^1,2 Warren Jin,⁴ Lue Wu,³ Wei Zhang,⁵ Joe Campbell,⁶ Andrey Matsko,⁵ Vladimir Iltchenko,⁵ John Bowers,⁴ Kerry Vahala,³ Frank Quinlan,^2,7 and Scott A. Diddams^1,2,7

¹Department of Physics, University of Colorado, Boulder, Colorado, USA

²Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado, USA

³T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California, USA

⁴Department of Electrical and Computer Engineering, University of California, Santa Barbara, California, USA

⁵Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

⁶Electrical and Computer Engineering, University of Virginia, Charlottesville, Virginia, USA

⁷Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado, USA