Precision measurements in terahertz laser frequency combs and photomixers

Chee-Wei Wong; Alwaleed Aldhafeeri

doi:10.1117/12.2682049

6 October 2023 Precision measurements in terahertz laser frequency combs and photomixers

Chee-Wei Wong, Alwaleed Aldhafeeri

Proceedings Volume PC12683, Terahertz Emitters, Receivers, and Applications XIV; PC1268301 (2023) https://doi.org/10.1117/12.2682049
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Chip-scale laser frequency microcombs has achieved equidistant coherent frequency markers over a broad spectrum, advancing frontiers in ultrafast frequency metrology, laser spectroscopy, dense communications, and precision metrology. In this talk we will describe advances in the generation of laser frequency microcombs in dispersion-engineered microresonators with terahertz frequency spacings. We start with the understanding of the phase- and frequency-noise characteristics of a variety of microcomb states, including the generation of THz Turing patterns in optical microcombs. Referenced to external high-purity sources, the microcombs – in the mmWave and THz frequency spacings – can preserve tooth-to-tooth relative frequency stabilization to an uncertainty of 50 mHz and 2.7e−16. Subsequently, these frequency microcombs drive the chip-scale efficient plasmonic photomixers from the Jarrahi group at UCLA, where together we are able to generate coherent and broadly-tunable THz-mmWave radiation generation. Coherent terahertz radiation spanning 2.8-octaves is achieved from 330 GHz to 2.3 THz, with ~ 20 GHz cavity-mode-limited frequency tuning step and ~ 10 MHz intracavity-mode continuous frequency tuning range at each step. By stabilizing the microresonator pump power and wavelength, we observed sub-100 Hz linewidth of the terahertz radiation with 1e-15 residual frequency instability. The room-temperature coherent frequency-agile THz radiation offers unique capabilities in metrology, sensing, imaging and communications.

Conference Presentation

Citation Download Citation

Chee-Wei Wong and Alwaleed Aldhafeeri "Precision measurements in terahertz laser frequency combs and photomixers", Proc. SPIE PC12683, Terahertz Emitters, Receivers, and Applications XIV, PC1268301 (6 October 2023); https://doi.org/10.1117/12.2682049

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KEYWORDS

Laser frequency

Terahertz radiation

Precision measurement

Laser stabilization

Metrology

Microresonators

Optical coherence

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