U Keller
Overview
Explore the profile of U Keller including associated specialties, affiliations and a list of published articles.
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520
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2782
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Recent Articles
1.
Camenzind S, Nussbaum-Lapping A, Willenberg B, Pupeikis J, Taher J, Hakala T, et al.
Opt Lett
. 2025 Feb;
50(4):1289-1292.
PMID: 39951785
Hyperspectral LiDAR (HSL) enables the simultaneous acquisition of the surface geometry and spectral signatures of remote natural targets, making it valuable for various applications such as material probing, automated point...
2.
de Vos E, Neb S, Niedermayr A, Burri F, Hollm M, Gallmann L, et al.
Phys Rev Lett
. 2023 Dec;
131(22):226901.
PMID: 38101348
We describe an ultrafast transition of the electronic response of optically excited transition metal β-tungsten with few-femtosecond time resolution. The response moves from a regime where state filling of the...
3.
Phillips C, Willenberg B, Nussbaum-Lapping A, Callegari F, Camenzind S, Pupeikis J, et al.
Opt Express
. 2023 May;
31(10):15888.
PMID: 37157679
This erratum corrects a typographical error in equation (8) of our published paper [Opt. Express31, 7103 (2023)10.1364/OE.479356]. All the calculations used the correct equation, so all the results and conclusions...
4.
Schumacher Z, Sato S, Neb S, Niedermayr A, Gallmann L, Rubio A, et al.
Proc Natl Acad Sci U S A
. 2023 Apr;
120(15):e2221725120.
PMID: 37014859
The coupling of light to electrical charge carriers in semiconductors is the foundation of many technological applications. Attosecond transient absorption spectroscopy measures simultaneously how excited electrons and the vacancies they...
5.
Phillips C, Willenberg B, Nussbaum-Lapping A, Callegari F, Camenzind S, Pupeikis J, et al.
Opt Express
. 2023 Mar;
31(5):7103-7119.
PMID: 36859848
We present a new type of dual optical frequency comb source capable of scaling applications to high measurement speeds while combining high average power, ultra-low noise operation, and a compact...
6.
Pupeikis J, Hu W, Willenberg B, Mehendale M, Antonelli G, Phillips C, et al.
Photoacoustics
. 2022 Dec;
29:100439.
PMID: 36570472
Ultrafast pump-probe measurements are used to characterize various samples, such as biological cells, bulk, and thin-film structures. However, typical implementations of the pump-probe apparatus are either slow or complex and...
7.
Bauer C, Camenzind S, Pupeikis J, Willenberg B, Phillips C, Keller U
Opt Express
. 2022 Oct;
30(11):19904-19921.
PMID: 36221754
We demonstrate a free-running single-cavity dual-comb optical parametric oscillator (OPO) pumped by a single-cavity dual-comb solid-state laser. The OPO ring cavity contains a single periodically-poled MgO-doped LiNbO (PPLN) crystal. Each...
8.
Camenzind S, Koenen D, Willenberg B, Pupeikis J, Phillips C, Keller U
Opt Express
. 2022 Feb;
30(4):5075-5094.
PMID: 35209478
Pulse trains emitted from dual-comb systems are designed to have low relative timing jitter, making them useful for many optical measurement techniques such as optical ranging and spectroscopy. However, the...
9.
Chevreuil P, Brunner F, Hrisafov S, Pupeikis J, Phillips C, Keller U, et al.
Opt Express
. 2021 Nov;
29(21):32996-33008.
PMID: 34809120
We compare the generation of high-order harmonics in the water window (283-543 eV) with 0.8-µm and 2.2-µm few-cycle lasers at a pulse repetition rate of 100 kHz. Using conventional phase...
10.
Kruger L, Camenzind S, Phillips C, Keller U
Opt Express
. 2021 Nov;
29(22):36915-36925.
PMID: 34809090
Cascaded quadratic nonlinearities from phase-mismatched second-harmonic generation build the foundation for robust soliton modelocking in straight-cavity laser configurations by providing a tunable and self-defocusing nonlinearity. The frequency dependence of the...