A5090114883- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Astro and Planetary Science
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Planetary Science and Exploration
- Atomic and Molecular Physics
- Photorefractive and Nonlinear Optics
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Space Exploration and Technology
- Advanced Optical Sensing Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Laser Material Processing Techniques
- Calibration and Measurement Techniques
- Geophysical and Geoelectrical Methods
- Scientific Research and Discoveries
- Semiconductor Lasers and Optical Devices
- Space exploration and regulation
- Spaceflight effects on biology
- Magnetic and Electromagnetic Effects
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Spectroscopy and Laser Applications
- Advanced Measurement and Metrology Techniques
ETH Zurich
2022-2024
University of Bern
2020-2023
Board of the Swiss Federal Institutes of Technology
2023
École Polytechnique Fédérale de Lausanne
2022
The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ( \mu <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi></mml:math> p) with 1 ppm accuracy by means pulsed laser spectroscopy to determine two-photon-exchange contribution 2\times10^{-4}...
Context. Observations by the Kepler satellite have revealed a gap between larger sub-Neptunes and smaller super-Earths that atmospheric escape models had predicted as an evaporation valley prior to discovery. Aims. We seek contrast results from simple X-ray extreme-ultraviolet (XUV)-driven energy-limited model against those direct hydrodynamic model. The latter calculates thermospheric temperature structure self-consistently, including cooling effects such thermal conduction. Besides...
Abstract The Mastcam-Z Camera is a stereoscopic, multispectral camera with zoom capability on NASA’s Mars-2020 Perseverance rover. relies set of two deck-mounted radiometric calibration targets to validate performance and provide an instantaneous estimate local irradiance allow conversion image data units reflectance (R ∗ or I/F) tactical timescale. Here, we describe the heritage, design, optical characterization these discuss their use during rover operations. primary target inherits...
The Pound-Drever-Hall (PDH) technique is a popular method for stabilizing the frequency of laser to stable optical resonator or, vice versa, length laser. We propose refinement yielding an "infinite" dynamic (capture) range so that correctly locked seed frequency, even after large perturbations. but off-resonant lock points (also called Trojan operating points), present in conventional PDH error signals, are removed by phase modulating at corresponding half free spectral resonator. verify...
The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ( \mu <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi></mml:math> p) with 1 ppm accuracy by means pulsed laser spectroscopy. In proposed experiment, p atom excited pulse from singlet to triplet sub-levels, and quenched back state an inelastic collision H _2 display="inline"><mml:msub><mml:mi /><mml:mn>2</mml:mn></mml:msub></mml:math>...
Slope streaks are albedo features that form frequently on equatorial Martian slopes. Most slope dark relative to surrounding terrains, a minor fraction is bright, and there rare transitioning exhibit contrast reversal partway downslope. Their formation mechanisms physical surface properties not well understood. New observations acquired by the Colour Stereo Surface Imaging System (CaSSIS) board ESA's ExoMars Trace Gas Orbiter (TGO) provide insights into streaks' microstructure, roughness...
We demonstrate an injection-seeded thin-disk Yb:YAG laser at 1030 nm, stabilized by the Pound-Drever-Hall (PDH) method. modified PDH scheme to obtain error signal free from Trojan locking points, which allowed robust re-locking of and reliable long-term operation. The single-frequency pulses have 50 mJ energy (limited avoid laser-induced damage) with a beam quality M2 < 1.1 adjustable length 55-110 ns. Heterodyne measurements confirmed spectral linewidth 3.7 MHz. short pulse build-up time...
We report on an Yb:YAG thin-disk multipass amplifier delivering 100 ns long pulses at a central wavelength of 1030 nm with energy 330 mJ repetition rate Hz. The beam quality factor the maximum was measured to be M
In applications of optical multipass cells in photochemical reactors and laser excitation weak transitions, estimation the radiation dose a volume interest allows to assess performance optimize design cell. We adopt radiant fluence as figure merit employ radiative transfer equation derive analytical expressions for average given interest. These are used establish practical approximations Monte Carlo ray tracing model spatial distribution fluence. Ray is performed with Zemax OpticsStudio 18.9.
Optical multipass cells are used in photochemical reactors and laser excitation of weak transitions. In these applications, estimation the radiation dose a volume interest allows us to assess performance optimize design cell. We adopt radiant fluence as figure merit employ radiative transfer equation derive analytical expressions for average given interest. These involve quantities that either obtained with Monte Carlo ray tracing methods or approximated on grounds geometry arguments....
We demonstrate an injection-seeded thin-disk Yb:YAG laser at 1030 nm, stabilized by the Pound-Drever-Hall (PDH) method. modified PDH scheme to obtain error signal free from Trojan locking points, which allowed robust re-locking of and reliable long-term operation. The single-frequency pulses have 50 mJ energy (limited avoid laser-induced damage) with a beam quality $\text{M}^2$ < 1.1 adjustable length 55-110 ns. Heterodyne measurements confirmed spectral linewidth 3.7 MHz. short pulse...
We demonstrate an injection-seeded thin-disk Yb:YAG laser at 1030 nm, stabilized by the Pound-Drever-Hall (PDH) method. modified PDH scheme to obtain error signal free from Trojan locking points, which allowed robust re-locking of and reliable long-term operation. The single-frequency pulses have 50 mJ energy (limited avoid laser-induced damage) with a beam quality M² < 1.1 adjustable length 55-110 ns. Heterodyne measurements confirmed spectral linewidth 3.7 MHz. short pulse build-up time...
We demonstrate an injection-seeded thin-disk Yb:YAG laser at 1030 nm, stabilized by the Pound-Drever-Hall (PDH) method. modified PDH scheme to obtain error signal free from Trojan locking points, which allowed robust re-locking of and reliable long-term operation. The single-frequency pulses have 50 mJ energy (limited avoid laser-induced damage) with a beam quality M² < 1.1 adjustable length 55-110 ns. Heterodyne measurements confirmed spectral linewidth 3.7 MHz. short pulse build-up time...
The Kepler satellite has revealed a gap between sub-Neptunes and super-Earths that atmospheric escape models had predicted as an evaporation valley. We seek to contrast results from simple XUV-driven energy-limited (ELIM) model against those direct hydrodynamic (HYDRO) model. Besides escape, the latter also includes boil-off regime. couple two internal structure follow planets' temporal evolution over Gyr. To see population-wide imprint of models, we first employ rectangular grid in initial...
We report on an Yb:YAG thin-disk multipass amplifier delivering 50 ns long pulses at a central wavelength of 1030 nm with energy 330 mJ repetition rate 100 Hz. The beam quality factor the maximum was measured to be $\text{M}^2 = 1.17$. small signal gain is 20, and 6.9. 20-pass designed as concatenation stable resonator segments in which alternately Fourier transformed relay-imaged back disk by 4f-imaging optical scheme stage. transform propagation makes output robust against spherical phase...
We report on an Yb:YAG thin-disk multipass amplifier delivering 50 ns long pulses at a central wavelength of 1030 nm with energy 330 mJ repetition rate 100 Hz. The beam quality factor the maximum was measured to be M² = 1.17. small signal gain is 20, and 6.9. 20-pass designed as concatenation stable resonator segments in which alternately Fourier transformed relay-imaged back disk by 4f-imaging optical scheme stage. transform propagation makes output robust against spherical phase front...
We report on an Yb:YAG thin-disk multipass amplifier delivering 50 ns long pulses at a central wavelength of 1030 nm with energy 330 mJ repetition rate 100 Hz. The beam quality factor the maximum was measured to be M² = 1.17. small signal gain is 20, and 6.9. 20-pass designed as concatenation stable resonator segments in which alternately Fourier transformed relay-imaged back disk by 4f-imaging optical scheme stage. transform propagation makes output robust against spherical phase front...
&lt;p&gt;The planetary Ice Laboratory has been developed at the University of Bern to measure various reflectance properties analogues for small bodies and surfaces with a special focus on icy surfaces. Its core facilities are set devices produce well-characterized reproducible analogue samples instruments designed over different spectral ranges, geometrical configurations, either in total light or sorted by polarisation state.&lt;/p&gt; &lt;p&gt;We use laboratory...