We present a comprehensive overview of sensor technology exploiting optical whispering
gallery mode (WGM) resonances. After a short introduction we begin by detailing the …

We review the most recent progress in ultralow-noise mode-locked fiber lasers and fiber-
based frequency-comb sources. With the rapid progress in theory, measurement, and …

Femtosecond laser-based generation of radio frequency signals has produced astonishing
improvements in achievable spectral purity, one of the basic features characterizing the …

Lasers with hertz linewidths at time scales of seconds are critical for metrology, timekeeping,
and manipulation of quantum systems. Such frequency stability relies on bulk-optic lasers …

The series of precisely spaced, sharp spectral lines that form an optical frequency comb is
enabling unprecedented measurement capabilities and new applications in a wide range of …

The ability to generate lower-noise microwaves has greatly advanced high-speed, high-
precision scientific and engineering fields. Microcombs have high potential for generating …

Advanced applications in optical metrology demand improved lasers with high spectral
purity, in form factors that are small and insensitive to environmental perturbations. While …

Optical microresonators are essential to a broad range of technologies and scientific
disciplines. However, many of their applications rely on discrete devices to attain …

Thermally induced fluctuations impose a fundamental limit on precision measurement. In
optical interferometry, the current bounds of stability and sensitivity are dictated by the …

Low-phase-noise microwave oscillators are important to a wide range of subjects, including
communications, radar and metrology. Photonic-based microwave-wave sources now …