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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...
Photoluminescence as a function of the time delay between two ultrafast laser pulses measures the nonlinear emission dynamics of quantum dots coupled to photonic crystal cavities and distinguishes between exciton and biexciton emission.
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 study, both theoretically and experimentally, emission of correlated photon-pairs by spontaneous four-wave-mixing in silicon integrated resonators. We show that the number of generated pairs in the quantum experiment is predicted by a classical experiment.
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 experimentally characterize a spontaneous parametric down-conversion source, based on a Beta-Barium-Borate crystal capable of emitting photons with positive or no spectral correlations. Our system employs a carefully designed detection method exploiting two InGaAs detectors.
We used velocity-map imaging to measure ultrafast electron dynamics in N2 initiated by attosecond pulses. A time-to-space mapping of autoionization channel is demonstrated. A sub-cycle oscillatory dynamics related to quantum interference is also observed.
We observed ultralow-threshold Raman lasing using direct free-space excitation of whispering gallery modes in a deformed microtoroid. This simple and robust excitation method can overcome the inadequacies of taper coupling.
Isolated attosecond pulses with continuum spectra extending below 15 eV are used to probe the sub-cycle energy shifts and splitting of helium excited states. Additionally, new absorption features appear far from the 1snp absorption lines.
We present the laser architecture that will be constructed as a pump laser for a Multi-TW OPCPA component test laboratory using glass rod amplifiers and a regenerative amplifier seeded by a modulated fiber laser source.
Using the measured density matrix of a four photon GHZ state, created in our unique inductive setup, we calculated the density matrices of possible states with higher photon numbers and their entanglement and non-locality violation.
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.
Tunable temperature-independent triple-idler broadcasting of a signal into selective WDM channels to cover whole C and L bands is demonstrated utilizing cascaded second-order interactions in a 20-mm-long step-chirped PPLN with an engineered ∼28-nm-wide type-0 second-harmonic bandwidth.
Reduction of absorption coefficient due to heat-up in hot-band pumped Nd:YAG was studied, and it was much smaller than cold-band pumping. In addition, the necessity of correction in the traditional model for line-bandwidth became clear.
Thermally induced distortions in Nd:glass rods 4.5cm in diameter have been measured and compensated by phase conjugate mirror and linear optics technique. Thermal loads in the rods are by factor 5 below thermal fraction limit.
A cw triple-wavelength selectable Nd:GdVO4 laser was demonstrated. When switching the dc voltages and applying 25 W pump power, the output wavelength can be selected among 912, 1063, and 1342 nm with watt-level output power.
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 report a unique design of a Raman silicon laser using a photonic crystal high-Q nanocavity without the reverse-biased p-i-n diode, which leads to the continuous-wave lasing operation with ultralow threshold power of ∼1 μW.
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