3 papers
physics.optics2026
Zeptosecond-level timing-noise floor in optical-to-terahertz photomixing
William F. McGrew, James Greenberg, Scott C. Egbert +6
Optical generation of terahertz (0.1 to 10\,THz) carriers can, in principle, preserve the spectral purity of an optical reference without the noise penalty associated with electron…
physics.optics2026
Tunable microwave frequency synthesis with optically-derived spectral purity
James Greenberg, Scott C. Egbert, William F. McGrew +2
Microwave synthesizers are central to test and measurement systems across applications including wireless communications, radar, spectroscopy, and time and frequency metrology. Sta…
physics.optics2026
Attosecond-timing millimeter waves via Kerr optical frequency division
Scott C. Egbert, Brendan M. Heffernan, James Greenberg +2
Millimeter-wave oscillators underpin key applications in communication, spectroscopy, radar, and astronomy, yet their achievable spectral purity remains limited. Approaches that di…