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We study the time- and spectrally-resolved exciton dynamics of a few-layer molybdenum disulfide using ultrafast optical pump-probe spectroscopy. We find that the carrier induced broadening significantly influence on the band-edge transmission spectra even with small carrier densities.
We track the collective terahertz free-carrier response of 1T-TiSe2 during femtosecond photo-induced melting and recovery of a charge density wave. The formation of charge order is highly sensitive to the transient excess carrier density, suggesting a strong excitonic influence.
We investigate deformations of fluid interfaces caused by small (∼nN) optical force of a low power laser beam under total-internal-reflection. For air-water interface deformations are undetectable, unlike recently claimed in ref. [3]. Using a critical fluid-fluid interface having weak surface tension large fluid-lens effects in the form of a bump are seen. Our observations support standard optofluidic...
We report on the formation of hexagonal polariton patterns in double semiconductor microcavities operating in the OPO regime. We experimentally and theoretically demonstrate both the formation and the optical control of these patterns.
We report the experimental implementation of a bulk metamaterial with an all-angle left-handed response in the ultraviolet. Using this metamaterial, we fabricate an optically switchable Veselago flat lens capable of imaging arbitrary two-dimensional objects beyond the near field.
Ballistic hot electrons in fs-laser-excited gold are used to generate ultrashort (2 ps duration) acoustic pulses in cobalt. The exponential dependence of the acoustic amplitude on gold thickness provides the electron mean-free-path of 120 nm.
Quantum photonics is a promising technology for implementing quantum information tasks. We demonstrate integration of multiple photon pair sources together with a circuit enabling creation and manipulation of photon pairs in a monolithic silicon-on-insulator chip.
We studied acoustic breathing modes of GaN nanorods on silicon substrates by ultrafast acoustic phonon spectroscopy. This technique could be utilized to nondestructively inspect uniformity of nanorods within the area of optical spot.
The high repetition rate laser systems providing the ELI-ALPS facility with TW-to-PW peak intensity pulses are designed to generate secondary light sources with a duration of tens of attosecond for basic and applied researches.
Single mode anomalous dispersion As2S3 on Er doped TeO2 waveguides with near zero propagation loss under 1475nm pumping are demonstrated. Fully lossless waveguides with high nonlinear coefficient can be achieved with higher 1480nm pump power.
In cavity-enhanced OPCPA, nonlinear phase shifts imparted on the intracavity pump pulse limit pump power loading and degrade system performance. We show that cavity-locking offsets these effects, maintaining dramatic bandwidth extension and high conversion efficiency.
We report the spectral pump equalization of on-chip microresonator frequency combs in the drop-port geometry. A smoother comb spectrum is obtained and a saturation behavior of the optical pump in the microresonator is observed.
We experimentally demonstrate two-photon Doppler free interactions on a chip-scale platform consisting of a silicon nitride waveguide integrated with rubidium vapor cladding. We obtain absorption lines having widths of 300 MHz, using low power levels.
We demonstrated a high contrast 1053 nm femtosecond laser by exchanging the signal and idler in two stages non-collinear optical-parametric amplifier, 60 μI idler with measurement-limited contrast of 2.3×1011 was obtained within scale of sub-10 ps.
We discuss coherent control of parametric frequency-comb generation in microresonators. Pumping a microresonator with multiple optical frequencies enables not only robust control over the resulting comb's line spacing, but also access to low-noise comb spectra.
We experimentally demonstrate that utilizing plasmonic contact electrodes enhances the optical-to-terahertz conversion efficiency of photoconductive terahertz emitters and offers more than 50-times higher radiation powers compared to conventional photoconductive terahertz emission techniques without plasmonic electrodes.
We report mid-infrared lasing around 3 μm from a single PbS subwavelength wire, with a cavity volume less than the wavelength cubed at 0.44 λ3. The maximal lasing temperature is 180 K under pulse operation.
Novel distributed feedback lasers were created in densely packed colloidal quantum dot single exciton gain media. The optically pumped lasers demonstrated internal efficiency of 28%, spatially coherent beams, average power of 400 μW.
We present an Yb:YAG modelocked thin-disk laser with a record-high average output power of 275 W, a pulse duration of 583 fs and a pulse energy of 16.9 μJ. Furthermore, we present first experiments towards higher pulse energies.
We present an innovative mirrorless optofluidic random laser where the optical cavity has been replaced by a random scattering structure. We achieve emission control at any desired wavelength by iteratively shaping the optical pump profile.
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