Test & Measurement

Credit: Thomas Walker
To build a quantum sensor, light must be prepared in a carefully controlled state where its frequency, polarization, and intensity are well controlled. The polarization of blue light is altered before it’s used to cool the atoms to near absolute zero.
Physicists build the first interferometers with the specific atom and transition needed for long-baseline sensors.
July 16, 2026
Credit: Ommatidia LiDAR
Ommatidia LiDAR’s Q2 laser radar deployed for noncontact field measurement.
July 14, 2026
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Following the Photons: A Photonics Podcast
July 7, 2026
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.
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

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