7 papers · 1 filter
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…
Dual-Wavelength Cancellation of Dispersion-Induced Phase Noise in Opto-Terahertz Fiber Links
Brendan M. Heffernan, James Greenberg, William F. McGrew +1
Stable dissemination of terahertz (THz) signals over long distances is important for next-generation synchronization networks, radio astronomy, and high-capacity wireless systems.…
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…
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…
Terahertz amplification by injection locking of waveguide resonant tunneling diode
James Greenberg, Brendan M. Heffernan, William F. McGrew +1
High power and low phase noise oscillators at terahertz frequencies are required for several burgeoning scientific and technological applications, including radioastronomy, imaging…
Dual-Wavelength Brillouin Lasers as compact Opto-Terahertz References for Low-Noise Microwave Synthesis
Scott C. Egbert, James Greenberg, Brendan M. Heffernan +2
Compact, ultra-low phase noise 10 GHz signals are essential for modern radar, coherent communications, and time-frequency metrology, especially with rising demands for additional s…
Dual wavelength brillouin laser terahertz source stabilized to carbonyl sulfide rotational transition
James Greenberg, Brendan M. Heffernan, William F. McGrew +2
Optical-based terahertz sources are important for many burgeoning scientific and technological applications. Among such applications is precision spectroscopy of molecules, which e…