A5017103439- Laser-Matter Interactions and Applications
- Spectroscopy and Quantum Chemical Studies
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Laser Design and Applications
- Terahertz technology and applications
- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Spectroscopy and Laser Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photoreceptor and optogenetics research
- Advanced Optical Sensing Technologies
- Photorefractive and Nonlinear Optics
- Bee Products Chemical Analysis
- Advanced Frequency and Time Standards
- Radiation Therapy and Dosimetry
- Photochemistry and Electron Transfer Studies
- Advanced Fiber Optic Sensors
- Quantum Information and Cryptography
- Advanced Chemical Physics Studies
- Quantum-Dot Cellular Automata
Stony Brook University
2017-2024
Adelphi University
2015-2017
Hebrew University of Jerusalem
1965
We demonstrate compression and shaping of few cycle pulses from a high average power ytterbium laser system. The commercial 20 W, 100 kHz Yb system are spectrally broadened in two-stages using cascaded, gas-filled, stretched hollow-core fibers then compressed shaped an acousto-optic modulator-based pulse-shaper. pulse-shaper allows for compression, characterization, all one system, producing ∼10 fs with 30 μ J energy.
We present momentum resolved covariance measurements of entangled electronic-nuclear wave packets created and probed with octave spanning phaselocked ultrafast pulses. launch vibrational on multiple electronic states via multiphoton absorption, probe these strong field double ionization using a second pulse. Momentum mapping the fragment ions highlights nuclear motion, while yield as function relative phase between pump pulses highlight coherence. The combined allow us to directly visualize...
We demonstrate coherent control over internal conversion during strong-field molecular ionization with shaped, few-cycle laser pulses. The is driven by interference in different neutral states, which are coupled via non-Born-Oppenheimer terms the Hamiltonian. Our measurements highlight preservation of electronic coherence nonadiabatic transitions between states.
We demonstrate spectral broadening and compression of amplified pulses from a titanium sapphire laser system using an argon-filled stretched, hollow-core fiber acousto-optic modulator based pulse-shaper. characterize the pulse-shaper assisted collinear frequency resolved optical gating, D-scans, D-scans variable path length water cell. The different characterization approaches consistently compress down to < 6 fs, less than ∼1 fs transform limit. discuss prospects for pulse shape...
We demonstrate long-lived electronic coherences in molecules using a combination of measurements with shaped octave spanning ultrafast laser pulses and calculations the light matter interaction. Our pump-probe prepare interrogate entangled nuclear-electronic wave packets whose phase remains well defined despite vibrational motion along many degrees freedom. The experiments illustrate how between excited states can survive, even when coherence ground state is lost, may have important...
We explore the validity of adiabatic elimination in derivation an essential-states representation time-dependent Schr\"odinger equation presence a strong laser field. consider off-resonant states generating effective two-level description light-matter interaction, where initial and final are two-photon resonant. The treatment is nonperturbative can be generalized to $N$-photon absorption.
The authors show theoretically and experimentally how the time-varying phase or frequency of a chirped strong-field ultrafast laser pulse can be used to control ionization yield different ionic states in polyatomic molecule. results are interpreted terms competition between two types nonadiabatic dynamics: multiphoton resonance internal conversion.
Time-resolved measurements of strong-field molecular ionization are performed to measure the photoelectron spectrum as a function pump-probe delay. The allow one follow dynamics and break them down into three steps, which include electronic excitation, internal conversion, coupling continuum.
We present a simple approach to characterize the spatial variation of gain in microchannel plate (MCP) coupled phosphor detectors using single electron or photon hits. The technique is easy implement and general enough be extended other kinds detectors. demonstrate efficacy on both laboratory Monte Carlo generated datasets. Furthermore, we use measure over time as MCP exposed an increasing number electrons.
We have developed a laser system to generate frequency-chirped light at rapid modulation speeds (∼100 MHz) with large frequency offset. Light from an external cavity diode its locked atomic resonance is passed through lithium niobate electro-optical phase modulator. The modulator driven by ∼6 GHz signal whose itself modulated RF MHz (<200 MHz). A second injection used filter out all of the except ±1 order more than 30 dB. Using this system, it possible 1 chirp in 5 ns.
Motivated by the possibility of multiphoton-driven pump-probe experiments, such as time-resolved photoelectron spectroscopy, we carry out essential states's calculations strong-field molecular excitation solving time-dependent Schr\"odinger equation for a molecule in high-intensity laser field. Usually rely on adiabatic elimination, but here make direct use large number energies and transition dipole moments obtained from electronic structure calculations. In this way, capture range...
We report on nonlinear compression of 2.5-μm, sub-100 fs laser pulses using a noble-gas-filled hollow core fiber. MgF 2 wedges are used to compress the pulse and perform dispersion-scan. Sub-3-cycle, 1.8-mJ obtained after compression.
Using rare gas-filled hollow-core-fibers we generate tunable UV pulses with bandwidths that support few-cycle duration via Resonant Dispersive Wave emission, which are temporally compressed and characterized using a home-built SD-FROG, demonstrating few-femtosecond pulse widths.
We demonstrate the production of shaped pulses in deep ultraviolet using a stretched, hollow-core fiber and an acousto-optic modulator based pulse-shaper.
We explore long lived electronic coherences in molecules using shaped ultrafast laser pulses to launch and probe entangled nuclear-electronic wave packets. find that under certain conditions, the phase remains well defined despite vibrational motion along many degrees of freedom. The experiments are interpreted with help structure calculations which corroborate our interpretation measurements
We demonstrate compression and shaping of few cycle pulses from a high average power Ytterbium laser system. The commercial 20 W, 100 kHz Yb system are spectrally broadened in two-stages using gas-filled, stretched hollow-core fibers then compressed shaped an acousto-optic modulator-based pulse-shaper. pulse-shaper allows for compression, characterization, all one system, producing ~10 fs with 50 uJ energy