U. Keller
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View article: Swept dual-comb spectroscopy via common-mode cavity tuning and stabilization
Swept dual-comb spectroscopy via common-mode cavity tuning and stabilization Open
We demonstrate common repetition rate sweeping in a single-cavity dual-comb laser for improving the resolution of spectroscopy measurements. As a proof of concept, we show spectroscopy of low-pressure acetylene, achieving an effective reso…
View article: Phonon-mode-specific modulation of electronic states in molybdenum dioxide
Phonon-mode-specific modulation of electronic states in molybdenum dioxide Open
Near-infrared pump and extreme ultraviolet probe transient absorption spectroscopy is employed to unravel the phonon-mode-specific modifications of electronic states near the Fermi energy in molybdenum dioxide. We observe distinct fingerpr…
View article: Strain-engineered vertical emitting InGaAsSb quantum well lasers at 2–2.4 µm: in-well vs. barrier pumping, silicate bonding, and thermal optimization
Strain-engineered vertical emitting InGaAsSb quantum well lasers at 2–2.4 µm: in-well vs. barrier pumping, silicate bonding, and thermal optimization Open
We present a comprehensive study of continuous-wave (cw) lasing in GaSb-based membrane external cavity surface emitting lasers (MECSELs) operating in the 2.0–2.4 µm range. Using both in-well and barrier pumping, we investigate the influenc…
View article: 3D in-situ profiling in a laser micromachining station using dual-comb LiDAR
3D in-situ profiling in a laser micromachining station using dual-comb LiDAR Open
One of the main challenges in laser micromachining is the complexity of the process development. The available monitoring capabilities are mostly limited to external measurement systems, significantly slowing down this step. We address thi…
View article: Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator
Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator Open
We report, to the best of our knowledge, the first demonstration of dual-comb operation from a femtosecond optical parametric oscillator (OPO) at a 1-GHz pulse repetition rate. The singly-resonant OPO is fundamentally synchronously pumped …
View article: Swept dual-comb spectroscopy via common-mode cavity tuning and stabilization
Swept dual-comb spectroscopy via common-mode cavity tuning and stabilization Open
We demonstrate gas spectroscopy of low-pressure acetylene using a single-cavity dual-comb Yb:CaF$_2$ laser operating at a 1-GHz repetition rate. To improve the spectral resolution under low-pressure conditions, we implement spectral interl…
View article: Swept dual-comb spectroscopy via common-mode cavity tuning and stabilization
Swept dual-comb spectroscopy via common-mode cavity tuning and stabilization Open
We demonstrate gas spectroscopy of low-pressure acetylene using a single-cavity dual-comb Yb:CaF$_2$ laser operating at a 1-GHz repetition rate. To improve the spectral resolution under low-pressure conditions, we implement spectral interl…
View article: Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator
Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator Open
We report the first demonstration of dual-comb operation from a femtosecond optical parametric oscillator (OPO) at a 1-GHz pulse repetition rate. The singly-resonant OPO is fundamentally synchronously pumped by a high-power low-noise Yb:Ca…
View article: Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator
Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator Open
We report the first demonstration of dual-comb operation from a femtosecond optical parametric oscillator (OPO) at a 1-GHz pulse repetition rate. The singly-resonant OPO is fundamentally synchronously pumped by a high-power low-noise Yb:Ca…
View article: Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator
Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator Open
We report the first demonstration of dual-comb operation from a femtosecond optical parametric oscillator (OPO) at a 1-GHz pulse repetition rate. The singly-resonant OPO is fundamentally synchronously pumped by a high-power low-noise Yb:Ca…
View article: Fast recovery dynamics of GaSbBi-based SESAMs for high-fluence operation
Fast recovery dynamics of GaSbBi-based SESAMs for high-fluence operation Open
Modelocked lasers operating in the 2–3 μm wavelength region are interesting for various spectroscopic applications. To this end, GaSb-based semiconductor saturable absorber mirrors (SESAMs) are developing fast as a practical technology for…
View article: Fast Recovery Dynamics of GaSbBi-based SESAMs for high-fluence operation
Fast Recovery Dynamics of GaSbBi-based SESAMs for high-fluence operation Open
Modelocked lasers operating at 2-3 um wavelength region are interesting for various spectroscopic applications. To this end, GaSb-based semiconductor saturable absorber mirrors (SESAMs) are developing fast as a practical technology for pas…
View article: Long-Range and Dead-Zone-Free Dual-Comb Ranging for the Interferometric Tracking of Moving Targets
Long-Range and Dead-Zone-Free Dual-Comb Ranging for the Interferometric Tracking of Moving Targets Open
Dual-comb ranging has emerged as an effective technology for long-distance metrology, providing absolute distance measurements with high speed, precision, and accuracy. Here, we demonstrate a dual-comb ranging method that utilizes a free-s…
View article: Composition-controlled recovery time of SWIR (2–2.4 µm) GaSb-based SESAMs
Composition-controlled recovery time of SWIR (2–2.4 µm) GaSb-based SESAMs Open
SEmiconductor Saturable Absorber Mirrors (SESAMs) have revolutionized the ultrafast laser industry. While SESAMs are well-established in the near-infrared regime, using GaAs-wafer epitaxy, there is an increasing interest for the short-wave…
View article: Ultra-low noise spectral broadening of two combs in a single ANDi fiber
Ultra-low noise spectral broadening of two combs in a single ANDi fiber Open
Developing high-brightness, low-noise supercontinuum (SC) sources is critical for a variety of ultrafast photonics applications. A key challenge in achieving low-noise operation is the suppression of incoherent nonlinear effects and the as…
View article: Hot-electron-induced substrate response in transient absorption spectroscopy of tantalum
Hot-electron-induced substrate response in transient absorption spectroscopy of tantalum Open
We demonstrate that for extreme ultraviolet (XUV) transient absorption spectroscopy measurements of thin-film metals, the substrate can significantly contribute to the observed change in absorption even if it is transparent to the pump pul…
View article: Composition-controlled recovery time of SWIR (2 - 2.4 µm) GaSb-based SESAMs
Composition-controlled recovery time of SWIR (2 - 2.4 µm) GaSb-based SESAMs Open
Semiconductor Saturable Absorber Mirrors (SESAMs) have revolutionized the ultrafast laser industry. While SESAMs are well-established in the near-infrared regime, using GaAs-wafer epitaxy, there is an increasing interest for the short-wave…
View article: Composition-controlled recovery time of SWIR (2 - 2.4 µm) GaSb-based SESAMs
Composition-controlled recovery time of SWIR (2 - 2.4 µm) GaSb-based SESAMs Open
Semiconductor Saturable Absorber Mirrors (SESAMs) have revolutionized the ultrafast laser industry. While SESAMs are well-established in the near-infrared regime, using GaAs-wafer epitaxy, there is an increasing interest for the short-wave…
View article: Broadband hyperspectral LiDAR with a free-running gigahertz dual-comb supercontinuum
Broadband hyperspectral LiDAR with a free-running gigahertz dual-comb supercontinuum Open
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 cloud segmentat…
View article: Broadband hyperspectral LiDAR with a free-running gigahertz dual-comb supercontinuum
Broadband hyperspectral LiDAR with a free-running gigahertz dual-comb supercontinuum Open
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 cloud segmentat…
View article: Long-range and dead-zone free dual-comb ranging for the interferometric tracking of moving targets
Long-range and dead-zone free dual-comb ranging for the interferometric tracking of moving targets Open
Dual-comb ranging has emerged as an effective technology for long-distance metrology, providing absolute distance measurements with high speed, precision, and accuracy. Here, we demonstrate a dual-comb ranging method that utilizes a free-s…
View article: High-sensitivity pump-probe spectroscopy with a dual-comb laser and a PM-Andi supercontinuum
High-sensitivity pump-probe spectroscopy with a dual-comb laser and a PM-Andi supercontinuum Open
Amplifier-based pump-probe systems, while versatile, often suffer from complexity and low measurement speeds, especially when probing samples require low excitation fluences. To address these limitations, we introduce a pump-probe system t…
View article: Orientation-resolved attosecond photoionization delays in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">N</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:math> molecule
Orientation-resolved attosecond photoionization delays in the molecule Open
We present a thorough theoretical and experimental investigation of photoionization time delays in the N2O molecule. Our theory provides actual XUV+IR time-resolved photoelectron spectra as measured in real reconstruction of attosecond bea…
View article: Ultrafast 550-W average-power thin-disk laser oscillator
Ultrafast 550-W average-power thin-disk laser oscillator Open
SESAM modelocked oscillators are interesting for applications in strong-field physics such as high-harmonic generation and attosecond science at high repetition rates or frequency combs in the ultraviolet. Here we present a SESAM modelocke…
View article: High-Sensitivity Pump-Probe Spectroscopy with a Dual-Comb Laser and a PM-ANDi Supercontinuum
High-Sensitivity Pump-Probe Spectroscopy with a Dual-Comb Laser and a PM-ANDi Supercontinuum Open
Amplifier-based pump-probe systems, while versatile, often suffer from complexity and low measurement speeds, especially when probing samples requiring low excitation fluences. To address these limitations, we introduce a pump-probe system…
View article: High-Sensitivity Pump-Probe Spectroscopy with a Dual-Comb Laser and a PM-ANDi Supercontinuum
High-Sensitivity Pump-Probe Spectroscopy with a Dual-Comb Laser and a PM-ANDi Supercontinuum Open
Amplifier-based pump-probe systems, while versatile, often suffer from complexity and low measurement speeds, especially when probing samples requiring low excitation fluences. To address these limitations, we introduce a pump-probe system…
View article: Study of Time-Resolved Dynamics in Turbid Medium Using a Single-Cavity Dual-Comb Laser
Study of Time-Resolved Dynamics in Turbid Medium Using a Single-Cavity Dual-Comb Laser Open
In measuring cerebral blood flow (CBF) noninvasively using optical techniques, diffusing-wave spectroscopy is often combined with near-infrared spectroscopy to obtain a reliable blood flow index. Measuring the blood flow index at a determi…