Author Affiliations

Andrew R. Ferdinand,^1,2,* Zachary L. Newman,^1,2,3 Wenqi Zhu,⁴ Sindhu Jammi,^1,2 Grisha Spektor,^1,2 David R. Carlson,^1,3 Will Lunden,⁵ Akash V. Rakholia,⁵ Dan Sheredy,⁵ Junyeob Song,⁴ Chad Ropp,⁶ Daron Westly,⁴ Vladimir A. Aksyuk,⁶ Martin M. Boyd,⁵ Amit Agrawal,⁴ and Scott B. Papp^1,2

¹Physical Measurement Laboratory, Time and Frequency Division, NIST, Boulder, CO, USA

²Department of Physics, University of Colorado, Boulder, Colorado, USA

³Octave Photonics, Louisville, CO 80027, USA

⁴Physical Measurement Laboratory, Microsystems and Nanotechnology Division, NIST, Gaithersburg, MD, USA

⁵Vector Atomic, Inc., Pleasonton, CA 94566

⁶Physical Measurement Laboratory, Photonics and Optomechanics Group, NIST, Gaithersburg, MD, USA

^*Corresponding author: andrew.ferdinand@colorado.edu