Henry Timmers
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View article: Collinear opto-optical loss modulation for carrier-envelope offset stabilization of a fiber frequency comb
Collinear opto-optical loss modulation for carrier-envelope offset stabilization of a fiber frequency comb Open
Opto-optical loss modulation (OOM) for stabilization of the carrier-envelope offset (CEO) frequency of a femtosecond all-fiber laser is performed using a collinear geometry. Amplitude-modulated 1064 nm light is fiber coupled into an end-pu…
View article: Ultrafast strong-field dissociation of vinyl bromide: An attosecond transient absorption spectroscopy and non-adiabatic molecular dynamics study
Ultrafast strong-field dissociation of vinyl bromide: An attosecond transient absorption spectroscopy and non-adiabatic molecular dynamics study Open
Attosecond extreme ultraviolet (XUV) and soft x-ray sources provide powerful new tools for studying ultrafast molecular dynamics with atomic, state, and charge specificity. In this report, we employ attosecond transient absorption spectros…
View article: Mid-infrared frequency combs at 10 GHz
Mid-infrared frequency combs at 10 GHz Open
We demonstrate mid-infrared (MIR) frequency combs at 10 GHz repetition rate via intra-pulse difference-frequency generation (DFG) in quasi-phase-matched nonlinear media. Few-cycle pump pulses ( , 100 pJ) from a near-infrared electro…
View article: Mid-infrared frequency comb with 6.7 W average power based on difference frequency generation
Mid-infrared frequency comb with 6.7 W average power based on difference frequency generation Open
We report on the development of a high-power mid-infrared frequency comb with 100 MHz repetition rate and 100 fs pulse duration. Difference frequency generation is realized between two branches derived from an Er:fiber comb, amplified sepa…
View article: Infrared frequency comb generation and spectroscopy with suspended silicon nanophotonic waveguides
Infrared frequency comb generation and spectroscopy with suspended silicon nanophotonic waveguides Open
Nanophotonic waveguides with sub-wavelength mode confinement and engineered\ndispersion profiles are an excellent platform for application-tailored\nnonlinear optical interactions at low pulse energies. Here, we present fully\nair clad sus…
View article: Infrared electric field sampled frequency comb spectroscopy
Infrared electric field sampled frequency comb spectroscopy Open
Generation and detection of single-cycle mid-infrared waveforms enables broadband, high-resolution spectroscopy across 3 to 27 μm.
View article: Supplementary document for Nonlinear silicon waveguides generating broadband, spectrally engineered frequency combs spanning 2.0-8.5 μm - 4091804.pdf
Supplementary document for Nonlinear silicon waveguides generating broadband, spectrally engineered frequency combs spanning 2.0-8.5 μm - 4091804.pdf Open
Supplementary document
View article: Nonlinear silicon waveguides generating broadband, spectrally engineered frequency combs spanning 2.0-8.5 μm
Nonlinear silicon waveguides generating broadband, spectrally engineered frequency combs spanning 2.0-8.5 μm Open
Nanophotonic waveguides with sub-wavelength mode confinement and engineered dispersion profiles are an excellent platform for application-tailored nonlinear optical interactions at low pulse energies. Here, we present fully air clad suspen…
View article: Widely tunable cavity-enhanced ultrafast spectroscopy
Widely tunable cavity-enhanced ultrafast spectroscopy Open
Generation of widely tunable frequency combs in the UV, visible, and infrared is discussed for use in cavity-enhanced transient absorption spectroscopy on gas-phase clusters. Progress towards cavity-enhanced two-dimensional spectroscopy is…
View article: Infrared electric-field sampled frequency comb spectroscopy
Infrared electric-field sampled frequency comb spectroscopy Open
Molecular spectroscopy in the mid-infrared portion of the electromagnetic spectrum (3--25 um) has been a cornerstone interdisciplinary analytical technique widely adapted across the biological, chemical, and physical sciences. Applications…
View article: HIGH-POWER MID-IR COMB GENERATION FOR CAVITY-ENHANCED 2DIR SPECTROSCOPY
HIGH-POWER MID-IR COMB GENERATION FOR CAVITY-ENHANCED 2DIR SPECTROSCOPY Open
The rotational spectra of the 1:1 heterodimer of difluoromethane and 1,1,1,2-tetrafluoroethane has been investigated by pulsed jet Fourier transform microwave spectroscopy and quantum chemical calculations. Three most stable conformers pre…
View article: Selectivity of Electronic Coherence and Attosecond Ionization Delays in Strong-Field Double Ionization
Selectivity of Electronic Coherence and Attosecond Ionization Delays in Strong-Field Double Ionization Open
Experiments are presented on real-time probing of coherent electron dynamics in xenon initiated by strong-field double ionization. Attosecond transient absorption measurements allow for characterization of electronic coherences as well as …
View article: Molecular fingerprinting with bright, broadband infrared frequency combs
Molecular fingerprinting with bright, broadband infrared frequency combs Open
Spectroscopy in the molecular fingerprint spectral region (6.7–20 µm) yields critical information on material structure for physical, chemical, and biological sciences. Despite decades of interest and effort, this portion of the electromag…
View article: Mid-infrared frequency comb generation via cascaded quadratic nonlinearities in quasi-phase-matched waveguides
Mid-infrared frequency comb generation via cascaded quadratic nonlinearities in quasi-phase-matched waveguides Open
We experimentally demonstrate a simple configuration for mid-infrared (MIR) frequency comb generation in quasi-phase-matched lithium niobate waveguides using the cascaded-χ(2) nonlinearity. With nanojoule-scale pulses from an Er:fiber lase…
View article: Dual frequency comb spectroscopy in the molecular fingerprint region
Dual frequency comb spectroscopy in the molecular fingerprint region Open
Spectroscopy in the molecular fingerprint spectral region (6.5-20 $μ$m) yields critical information on material structure for physical, chemical and biological sciences. Despite decades of interest and effort, this portion of the electroma…
View article: High-harmonic generation in periodically poled waveguides
High-harmonic generation in periodically poled waveguides Open
Optical waveguides made from periodically poled materials provide high confinement of light and enable the generation of new wavelengths via quasi-phase-matching, making them a key platform for nonlinear optics and photonics. However, such…
View article: Attosecond transient-absorption dynamics of xenon core-excited states in a strong driving field
Attosecond transient-absorption dynamics of xenon core-excited states in a strong driving field Open
We introduce attosecond transient-absorption experiments on xenon 4d-16p core-level states resonantly driven by intense (1.6 ×1014W/cm2) few-cycle near-infrared laser pulses. In this strongly driven regime, broad induced absorption feature…
View article: Generating high-contrast, near single-cycle waveforms with third-order dispersion compensation
Generating high-contrast, near single-cycle waveforms with third-order dispersion compensation Open
Femtosecond laser pulses lasting only a few optical periods hold the potential for probing and manipulating the electronic degrees of freedom within matter. However, the generation of high-contrast, few-cycle pulses in the high power limit…
View article: Polarization-assisted amplitude gating as a route to tunable, high-contrast attosecond pulses
Polarization-assisted amplitude gating as a route to tunable, high-contrast attosecond pulses Open
Attosecond spectroscopy is a powerful technique for probing electron dynamics in fundamental systems. However, extending this method to cover a wide range of element-specific, core-hole transitions requires the availability of broadly tuna…
View article: Attosecond quantum-beat spectroscopy in helium
Attosecond quantum-beat spectroscopy in helium Open
The evolution of electron wavepackets determines the course of many physical and chemical phenomena and attosecond spectroscopy aims to measure and control such dynamics in real-time. Here, we investigate radial electron wavepacket motion …