Benjamin Willenberg
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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: 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: 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: 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: 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: Optically Pumped GaSb-Based Thin-Disk Laser Design Considerations for CW and Dual-Comb Operation at a Center Wavelength Around 2 $\rm \mu$m
Optically Pumped GaSb-Based Thin-Disk Laser Design Considerations for CW and Dual-Comb Operation at a Center Wavelength Around 2 $\rm \mu$m Open
View article: High-sensitivity dual-comb and cross-comb spectroscopy across the infrared using a widely tunable and free-running optical parametric oscillator
High-sensitivity dual-comb and cross-comb spectroscopy across the infrared using a widely tunable and free-running optical parametric oscillator Open
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…
View article: Shot-noise limited dual-comb supercontinuum
Shot-noise limited dual-comb supercontinuum Open
Dual-comb supercontinuum (SC) sources are promising for metrology and spectroscopy applications as their broad bandwidth supports the detection of multiple spectral features simultaneously. However, the limited sensitivity inherent to thei…
View article: 3D profiling in a laser micromachining station using dual-comb LiDAR
3D profiling in a laser micromachining station using dual-comb LiDAR Open
We present a coaxial dual-comb LiDAR integrated into a laser micromachining station, enabling in-situ 3D profiling of machined parts with sub-micrometer axial precision, offering a cost-effective solution with high precision capability.
View article: Gigahertz semiconductor laser at a center wavelength of 2 µm in single and dual-comb operation
Gigahertz semiconductor laser at a center wavelength of 2 µm in single and dual-comb operation Open
Dual-comb lasers are a new class of ultrafast lasers that enable fast, accurate and sensitive measurements without any mechanical delay lines. Here, we demonstrate a 2-µm laser called MIXSEL (Modelocked Integrated eXternal-cavity Surface E…
View article: High-sensitivity dual-comb and cross-comb spectroscopy across the infrared using a widely-tunable and free-running optical parametric oscillator
High-sensitivity dual-comb and cross-comb spectroscopy across the infrared using a widely-tunable and free-running optical parametric oscillator Open
Coherent dual-comb spectroscopy (DCS) enables high-resolution measurements at high speeds without the trade-off between resolution and update rate inherent to mechanical delay scanning approaches. However, high system complexity and limite…
View article: Coherently averaged dual-comb spectroscopy with a low-noise and high-power free-running gigahertz dual-comb laser: erratum
Coherently averaged dual-comb spectroscopy with a low-noise and high-power free-running gigahertz dual-comb laser: erratum Open
This erratum corrects a typographical error in equation (8) of our published paper [ Opt. Express 31 , 7103 ( 2023 ) 10.1364/OE.479356 ]. All the calculations used the correct equation, so all the results and conclusions remain unchanged.
View article: Gigahertz Single-cavity Dual-comb Laser for Rapid Time-domain Spectroscopy: from Few Terahertz to Optical Frequencies
Gigahertz Single-cavity Dual-comb Laser for Rapid Time-domain Spectroscopy: from Few Terahertz to Optical Frequencies Open
Dual-comb generation from a single laser cavity provides a simple and high-performance solution to time sampling applications. We demonstrate a compact single-cavity dual-comb laser operating at gigahertz repetition rates and high repetiti…
View article: Coherently averaged dual-comb spectroscopy with a low-noise and high-power free-running gigahertz dual-comb laser
Coherently averaged dual-comb spectroscopy with a low-noise and high-power free-running gigahertz dual-comb laser Open
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 setup. Our approach is based on a diode-pum…
View article: Free-running Yb:KYW dual-comb oscillator in a MOPA architecture
Free-running Yb:KYW dual-comb oscillator in a MOPA architecture Open
Single-cavity dual-combs comprise a rapidly emerging technology platform suitable for a wide range of applications like optical ranging, equivalent time sampling, and spectroscopy. However, it remains a challenging task to develop a dual-c…
View article: Low-Noise Femtosecond SESAM Modelocked Diode-Pumped Cr:ZnS Oscillator
Low-Noise Femtosecond SESAM Modelocked Diode-Pumped Cr:ZnS Oscillator Open
Cr-doped ZnS and ZnSe are excellent gain mediums for high power and broadband ultrashort pulse generation in the 2 – 3 μm wavelength range. SESAM modelocked Cr:ZnS oscillators have the advantage of reliable, self-starting passive modelocki…
View article: Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals
Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals Open
Femtosecond dual-comb lasers have revolutionized linear Fourier-domain spectroscopy by offering a rapid motion-free, precise, and accurate measurement mode with easy registration of the combs beat note in the radio frequency domain. Extens…
View article: Efficient pump-probe sampling with a single-cavity dual-comb laser: Application in ultrafast photoacoustics
Efficient pump-probe sampling with a single-cavity dual-comb laser: Application in ultrafast photoacoustics Open
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 costly hinder…