Test & Measurement

FIGURE 1. Top: An OFC generated by a modelocked laser. Bottom: A periodic pulse train in the time domain corresponds to a series of discrete frequencies in the frequency domain. The frequency comb is shifted in frequency space by a carrier-envelope offset frequency fceo, which arises from the carrier envelope phase slip Δφ between successive pulses. Apart from this offset, the comb consists of equally spaced spectral lines separated by the repetition rate frep.
Primer: Fundamentals of ultralow-noise frequency comb technology and how to transfer spectral purity without degradation across broad optical bandwidths.
July 1, 2026
Working principle of the Fourier-optics-based angle-resolved imaging spectrometer.
June 25, 2026
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Following the Photons: A Photonics Podcast
June 16, 2026
Credit: Zheru Qiu/EPFL
Zheru Qiu and colleague Xuan Yang in the lab with the team’s on-chip ultrafast laser.
June 12, 2026
Credit: Wolf/TU Graz
Birgitta Bernhardt in the lab with the retroreflector counterpart to her mobile UV dual-comb spectrometer.
June 11, 2026
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Following the Photons: A Photonics Podcast
June 10, 2026
Credit: Isaac Nape
Light Mkhumbuza, a graduate student at Wits University’s School of Physics, who ran the team’s experiments.
June 1, 2026
Credit: Vahala Lab/Caltech
Researchers at Caltech designed an approach for guiding light on silicon wafers with low signal loss comparable to that of optical fiber at visible wavelengths, which paves the way for a new generation of PICs.
May 29, 2026
Credit: Phlux Technology
FIGURE 1. Time-of-flight physics.
May 28, 2026

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