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We demonstrate a pump-probe phase-contrast method that reconstructs the spatio-temporal profile of plasma structures at density as low as 1016 cm−3. The method is compatible with very thin, very long, even turbulent media.
We report on the first demonstration of the locking of a 28000 finesse cavity in picosecond regime. Besides, we have unambiguously measured the CEP drift of 2 ps pulses and characterized its effect on cavity locking.
We report on the generation of coherent N2+ emissions in a plasma string driven by two-color laser fields and measure their temporal structures. It is confirmed that the coherent emissions originate from seed-injected amplification.
We present the latest results in extending dual-comb spectroscopy to two-photon resonances. By measuring two-photon excitation of rubidium vapor and water-dissolved fluorophores, we demonstrate both the high resolution and speed of the technique.
By coating a layer of polydimethylsiloxane (PDMS) on the silica microcavity surface, we observe the Raman laser emission from PDMS, which is to our knowledge the first demonstration of polymer cavity Raman laser.
We report for the first time an alternative way to detect the mode splitting in a silica microcavity through measuring the heterodyne beat note signal of a Raman laser mode.
We characterized luminescent properties of InGaN nanodisks in both quantum well and dot regimes. The luminescent efficiency increases as strain is relaxed in the quantum well but peaks at the transition from well to dot.
The unique combination of the LCLS x-ray laser with high-power nanosecond and femtosecond laser beams at the Matter of Extreme Conditions allows precision pump-probe studies of high energy density plasmas. For this purpose, we are building a new 200 TW laser system to measure and uncover the underlying physics mechanism that determine the interaction of ultra intense laser beams with matter. The repetition...
A fiber-coupled, 10-kHz, UV-PLIF and PIV combined detection system employing a common 6-m-long optical fiber is developed for simultaneous 2D fields of OH radical concentration and velocity measurements in practical combustion facilities.
The first-order spatial correlation function of a Bose-Einstein condensate of exciton-polaritons in a semiconductor microcavity is measured. It behaves as the Berezinskii-Kosterlitz-Thouless theory predicts and decays with a power-law.
Thomson scattering is reported for the first time to measure the electron density and temperature of aluminum laser plasma in air. Electron and excitation temperatures are compared to discuss local thermodynamic equilibrium in such plasmas.
We report on recent progress in development of new gain media for tunable (3–8 μm) mid-IR lasers as well as Fe:ZnS/Se lasers operating in CW (>1.5W), gain-switched (>1 mJ@7ns@lkHz) and long-pulse (>0.5 J@20μs) regimes.
We demonstrate the detection of single protein molecules in an aqueous environment with an Yb-doped silica microlaser. With the employment of a real-time spectrum analyzer, a fast sampling speed of sub-milliseconds per spectrum was adopted.
The Photoluminescence spectra and lifetime of Fe2+ doped ZnSe crystal with quantum cascade laser pumping is measured. At room temperature the photoluminescence lifetime is ∼ 0.38 μs, which increases to ∼ 100 μs at 80K.
We present a non-intrusive laser based technique for tagging flows. The femtosecond laser electronic excitation tagging (FLEET) is based on writing patterns in air and following the nitrogen pink afterglow.
The one-dimensional resonant cavity is formed by contacting a curved microfiber to the dual-rail nanobeam. Experimentally we measure the spontaneous emission factor of the nanobeam laser of 0.16 and fiber-coupling efficiency of 30%.
Compact λ = 13.9 nm and λ = 18.9 nm lasers with record >0.1 mW average power were demonstrated using a 100 Hz repetition rate diode-pumped CPA laser. Successful scaling to λ = 10.9 nm is reported.
We show that a localized and long-lived quasi-stationary gas density depression exists after filament-generated-plasma recombination. Its millisecond timescale dynamics is governed by thermal diffusion and has strong effects on high-repetition-rate filamentation and supercontinuum generation.
We demonstrated a three-stage Cr:ZnSe power-amplifier pumped with a Tm:YAG laser. Maximum pulse energy of 52.2 mJ was obtained at 2.41 μm in the three-stage Cr:ZnSe power amplifier. Energy conversion efficiency of the Cr:ZnSe power amplifier reached more than 44%.
We present a new technique of non-linear dual-comb spectroscopy for the measurement of coherent Stokes and anti-Stokes Raman spectra of fundamental vibrational transitions. Ultrarapid acquisition times, high-resolution, broad-spectral-span are the main characteristics of our experiments.
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