A5007019961- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Spectroscopy and Laser Applications
- Spectroscopy and Quantum Chemical Studies
- Terahertz technology and applications
- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Laser-induced spectroscopy and plasma
- Advanced Optical Sensing Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Laser Design and Applications
- Photoreceptor and optogenetics research
- Mass Spectrometry Techniques and Applications
- Gas Dynamics and Kinetic Theory
The Ohio State University
2024-2025
University of Central Florida
2019-2025
Ho Chi Minh City University of Technology and Education
2015
Field-resolved measurements of few-cycle laser waveforms allow access to ultrafast electron dynamics in light–matter interactions and are key future lightwave electronics. Recently, sub-cycle gating based on nonlinear excitation active pixel sensors has allowed the first single-shot mid-infrared optical fields. Extending techniques shorter wavelengths, however, is not feasible using silicon-based detectors with bandgaps near-infrared. Here, we demonstrate an all-optical sampling technique...
Molecular gases enable extreme compression of industrial-grade lasers, providing a more accessible platform for attosecond science.
Few-cycle, long-wavelength sources for generating isolated attosecond soft x ray pulses typically rely upon complex laser architectures. Here, we demonstrate a comparatively simple setup sub-two-cycle in the short-wave infrared based on multidimensional solitary states an N2O-filled hollow-core fiber and two-channel light-field synthesizer. Due to temporal phase imprinted by rotational nonlinearity of molecular gas, redshifted (from 1.03 1.36 µm central wavelength) supercontinuum generated...
Yb-doped laser amplifiers have, in recent years, found applications attosecond science, driven largely by the opportunities associated with high-average-power and high-repetition-rate sources. In this Perspective article, we outline advances upcoming pulse generation measurements based on amplifiers.
We present an in-depth study on the impact of spatiotemporal Raman enhancement in molecular gas-filled hollow-core fibers (HCFs), demonstrating efficient generation and post-compression multidimensional solitary states (MDSS). Through different experimental scenarios—employing large-core HCFs filled with gases (N2 N2O) driven by high energy, sub-picosecond picosecond Fourier transform-limited ytterbium laser pulses—this work leverages multimode propagation enhanced interactions to achieve...
Few-cycle sources with high average powers are required for applications to attosecond science. Raman-enhanced spectral broadening of Yb-doped laser amplifiers in molecular gases can yield few-cycle pulses, but thermal excitation vibrational and rotational degrees freedom may preclude high-power operation. Here we investigate changes the associated repetitive interactions an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD">...
Accompanied by the rapid development of ultrafast laser platforms in recent decades, spatiotemporal manipulation ultrashort pulses has attracted much attention due to potential for cutting-edge applications structured light, including optical tweezers, communications, super-resolution imaging, time-resolved spectroscopy molecules and quantum materials, strong-field physics. Today, techniques capable characterizing full spatial, temporal, polarization state properties light are strongly...
Few-cycle laser pulses at a high repetition rate with stable carrier-envelope phase are required for next-generation attosecond time-resolved spectroscopies. One way to generate these is the nonlinear compression of via gas-filled hollow-core fibers. Recently, an alternative approach based on multi-pass cells (MPCs) has been shown be very efficient post-compression turn-key, industrial-grade, average power Yb-doped solid-state amplifiers. However, expand system exploring strong-field...
Layered metal thio- and selenophosphates (MTPs) are a family of van der Waals gapped materials that exhibit multitude functionalities in terms magnetic, ferroelectric, optical properties. Despite the recent progress understanding material properties these compounds, potential MTPs as class yet needs further scrutiny, especially nonlinear Recent reports efficient low-order harmonic generation extremely high third-order suggest application integrated nanophotonics. In this article, we...
Abstract Next-generation attosecond spectroscopies require high-repetition-rate driving lasers with few-cycle pulse duration, stable carrier-envelope phase, and ease of operation. Industrial-grade Yb-doped solid-state regenerative amplifiers perform very well at high repetition rates, but their relatively long durations necessitate post-compression techniques large compression factor to reach the limit. Here, we demonstrate two-stage hybrid nonlinear 280 fs pulses from a Yb:KGW amplifier 5.6...
By numerically solving the time-dependent Schrödinger equation, we calculate ionization probability of a vibrating H2+ exposed to ultrashort intense laser fields. The results show that increases by time and gets saturation value. We also find with some first vibration levels, from higher level is larger than lower one. However, at certain will take maximum decrease next levels.
Spectral narrowing and power reduction, resulting from the thermal effect of nonlinear molecules at high repletion rate, can be mitigated by adding helium buffer-gas in N 2 O-filled hollow-core fiber without changing spectral phase.
The measurement of few-cycle laser waveforms allows access to light-matter interactions on sub-fs time scale. We demonstrate that single-shot waveform in shortwave infrared range can be implemented by exploiting multiphoton excitation solid and its ability observe the phase shift nonlinear propagation.
Multiphoton excitation in AlGaN provides a sub-cycle gate capable of sampling few-cycle waveforms the near-infrared. We demonstrate near-infrared laser waveform using an photodiode scanning TIPTOE geometry.
Yb-doped lasers are an attractive platform for attosecond science at high repetition rate. Here, we demonstrate carrier-envelope phase-dependent high-order harmonic generation using polarization gating of few-cycle pulses resulting from two-stage-fiber compression.
We demonstrate that multiphoton excitation in a CMOS image sensor can be used as sub-cycle temporal gate, allowing the measurement of full space, time, and polarization state structured mid-infrared laser waveforms.
Octave-spanning spectra centered at 1.4 µm are generated by Raman-enhanced spectral broadening of a Yb:KGW amplifier in N 2 O-filled hollow-core fiber and compressed to 1.5 cycles two-channel synthesizer using only bulk materials for compression.
Knowledge of the space-time properties ultrafast laser pulses is necessary both for characterizing spatiotemporal distortions and applications using structured beams. In past, such characterization has relied mainly upon measurements linear interference between an 'unknown' pulse a 'reference' [1]. To measure unknown pulse, reference must be spatially homogeneous, its amplitude phase characterized independently. addition, measurement been confined to visible near-infrared regions spectrum...
Thermal effects in molecular gas-filled hollow core fibers limit spectral broadening at high repetition rates. Here, we show that these can be mitigated by introducing helium buffer gas to an N 2 O-filled fiber. Both the energy throughput and bandwidth are improved
The field of attosecond science was first enabled by nonlinear compression intense laser pulses to a duration below two optical cycles. Twenty years later, creating such short still requires state-of-the-art few-cycle amplifiers most efficiently exploit 'instantaneous' nonlinearities in noble gases for spectral broadening and parametric frequency conversion. Here, we show that can fact be much more efficient when driven molecular substantially longer than few cycles, due enhanced...
Two-cycle pulses (7.2 fs FWHM) are obtained from a Yb: KGW laser amplifier through Raman-enhanced supercontinuum generation in nitrogen filled hollow-core fiber and chirped mirror compressor with an overall 50% throughput efficiency.
The delayed optical nonlinearity of molecules is harnessed to generate a multi-octave supercontinuum and compress 280 fs pulses from commercial Yb:KGW laser amplifier sub-two cycle duration using an N2O filled hollow-core fiber.