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We study the guiding effect of femtosecond laser filaments on high-voltage electric discharges generated by a compact Tesla coil. Meter scale repetitive discharges are demonstrated.
We present the new regime of high-order harmonics generation by multi-TW femtosecond lasers irradiating gas jet targets. We describe new results concerning the off-axis XUV harmonics emission, angular distribution and source size.
We demonstrate for the first time that fine varying of the density gradient of a plasma mirror along with laser spatial phase on target allows total control over the harmonic generation mechanisms and harmonic spatial properties. An analytical model is also proposed.
We demonstrate experimentally an optical event horizon in a waveguide structure akin to a hydrodynamic Laval nozzle. The event horizon which forms at the nozzle throat is suggested as a platform for analog gravity experiments.
We present the measurement of χ(3) nonlinearity of Green Fluorescent Protein. The nonlinear index is n2 = 10−19m2/W, opening the possibility of using genetically engineerable and naturally occuring proteins in cells as a source of four wave mixing experiments.
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...
Efficient Terahertz output is generated from InGaN/GaN dot-in-a-wire light emitting diodes (LEDs) grown on Si(111). Under reverse bias, the THz output power is enhanced more than 4 times.
A tunable orbital angular momentum (OAM) mode filter is proposed. Filtering/blocking selected channels from 4 spatially multiplexed OAM channels is demonstrated. An OSNR penalty of <2 dB is observed when using the filter for 100 Gb/s QPSK data channels.
We report high power operation of a Kagome-type HC-PCF at 1 μm. We demonstrate guidance of thin disk laser beam with powers in excess of 100 W in cw and 75 W in modelocked operation.
Theory of thermally induced polarization and phase beam distortions in laser ceramics was improved and extended to the case of class 23 and m3 cubic crystals.
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.
The optical nonlinearities of the chalcogenide Ge28Sb12Se60 are studied using the z-scan technique with femtosecond and picosecond laser pulses at 1.0 μm. Results indicate this glass shows promise for nonlinear optical waveguide devices.
Improvement of resolution beyond the Rayleigh limit is obtained by monitoring non-resonant four wave mixing generated by the target in a confocal scanning microscope configuration.
We measure the polarization evolution of ultrashort pulses (filaments) propagating in air for various pulse widths and energies. We observe the change of light ellipticity close to circular polarization.
We demonstrate the use of chirped volume Bragg gratings (VBGs) as flat focusing elements for wavelengths different than the wavelength used for recording of the Bragg grating and with efficiencies of up to 95%. The VBGs were recorded in photo-thermo-refractive (PTR) glass with laser generating at 325 nm and were tested with wavelengths ranging from visible up to near IR spectral regions and beam sizes...
We validate the use of a quadriwave lateral shearing Wave Front Sensor (WFS) to make an ISO compliant M2 measurement. We compare measurements made following the ISO standard method with those made with the WFS.
The cross-correlator described below excels in its high speed (>1500cm/s) and high amplitude of the diagnostic channel delay. Such characteristics allow the cross-correlator to scan pulses inside 300-microsecond long pulse trains, repeated with the frequency of 10Hz.
We demonstrate stable beam self-trapping in soft-matter systems with artificial saturable self-focusing nonlinearities. Our experiments reveal optical beam interactions that can vary from attractive to repulsive as well as an energy exchange.
We propose and experimentally demonstrate new beam solutions in form of azimuthally symmetric higher-order Bessel-Gauss beams. We experimentally observe these beams as higher-order eigenmodes in optical resonators consisting of aspheric mirrors.
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...
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