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Efficient broadband spectrum oscillation was obtained directly from a laser-diode-pumped Kerr-lens mode-locked Yb:YAG laser with intracavity nonlinear media. The spectrum was expanded to around 1040 nm to 1070 nm. The spectrum is much broader than the fluorescence spectrum at 1050 nm.
We report detailed spectral and spatial characterization of a 0.1-MeV-0.8 MeV tunable ultra-bright laser-based Compton scattering source. Nuclear Resonance Fluorescence experiments with the source are also presented.
We present a procedure for simultaneous optimization of efficiency-bandwidth product and superfluorescence noise suppression in ultrabroadband high-energy optical parametric chirped pulse amplification. Gain dependence of parameters makes stage-by-stage signal chirp optimization necessary in multi-stage amplification.
Two methods of filamentation control for remote applications were studied. The first one consisted in an adaptive optic system, implemented in a specially designed focusing beam expander, which corrected for wavefront aberrations. Using this setup we are able to generate extraordinarily strong nitrogen signals at a distance as far as 90 m using 40 mJ laser pulses. Moreover, the filaments produced...
We have observed third-harmonic generation by single nanorods in solution and investigated its excitation polarization dependence. Our findings demonstrate the possibility of using third-harmonic signals for correlation spectroscopy, in contrast to conventional fluorescence correlation spectroscopy.
Imaging of vapor-phase H2O2 concentrations is performed using photofragmentation LIF. An Nd:YAG-laser is used for photolysis and a dye laser for LIF on OH generated in the photolysis process. Detection limit is ~30 ppm.
We present a new technique for dispersion compensation with >105 fs2 range and kilohertz tuning speed, enabling high-speed focal plane scanning of two-photon excited fluorescence in a temporal focusing setup.
We propose and develop a nanoprobe-based technique for characterizing femtosecond laser pulses. A preliminary demonstration based on the measurement of the interferometric autocorrelation trace through two-photon fluorescence from a nonlinear nanoprobe is reported.
Three-photon fluorescence and lasing from ZnSe was observed for a kilojoule-class, 100 picosecond pulse, Nd:glass laser excitation. In this work, the emission properties and its excitation energy dependence were investigated for low and high-energy excitation.
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