Ursula Keller

Swiss laser physicist and university teacher (born 1959)

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Born 1959 · age 67Switzerland

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Wikipedia
14 languages
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Age
67
Born 1959
Awards
11
recognised works

Summary

Updated 2026-06-13

Ursula Keller is a Swiss physicist. She has been a tenured physics professor at ETH Zurich, Switzerland since 1993. A pioneer in ultrafast science and technology, she is known for inventing the semiconductor saturable absorber mirror (SESAM), enabling passive mode-locking of lasers and revolutionizing ultrafast laser applications in science and industry. Keller led the Swiss NCCR MUST program in ultrafast science (2010–2022), co-founded several companies, including Time-Bandwidth Products and K2 Photonics, and published a graduate textbook "Ultrafast Laser Physics" with Springer Verlag. She is highly cited and received many prestigious awards. From 2012-2016 she was the founding president of the Women Professors Forum at ETH Zurich.