Author Affiliations

D. Carlson,^1,* W. Hettel,¹ D. Morrill,¹ D. Lesko,^2,3 T.-H. Wu,^2,3 F. Yu,^4,5,6 S. Diddams,^2,3 H. Kapteyn,¹ M. Murnane,¹ and M. Hemmer¹

¹Department of Physics, JILA & STROBE NSF Science & Technology Center, University of Colorado & NIST, Boulder, Colorado, USA

²Time and Frequency Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA

³Department of Physics, University of Colorado, 2000 Colorado Ave., Boulder, Colorado 80309, USA

⁴Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, BA2 7AY, United Kingdom

⁵Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

⁶Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China

^*Corresponding author: daniel.r.carlson@colorado.edu