Lasers & Sources

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
OPTOMAN high-power laser optics.
July 9, 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
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Following the Photons: A Photonics Podcast
June 30, 2026
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June 17, 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
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Following the Photons: A Photonics Podcast
June 2, 2026
Credit: Caroline Perron
Pierre Luc Thériault, a Ph.D. student in engineering physics, aligns the team’s experimental setup.
June 2, 2026

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