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We present femtosecond induced volume Bragg gratings (VBGs) using a phase mask technique. For the first time we could realize reflecting VBGs in fused silica with a high period stability and periods down to 537.5nm.
We demonstrate that spatially chirped femtosecond laser pulses overcome previous limitations for the machining of high-aspect ratio features with low numerical aperture beams in optically transparent materials.
Basics and last results in spectral beam combining by volume Bragg gratings recorded in photo-thermo-refractive glass based on their high efficiency, narrow spectral selectivity and high tolerance to high power laser radiation are presented.
A new approach for fabrication of sub-millimetre width cylindrical mirrors in fused silica by localized CO2 vaporization and bumping is presented. Formation of reversed bumps and their removal by annealing is also investigated here.
Femtosecond laser writing in glass is controlled by the polarization plane azimuth and intensity front tilt of light pulse. Polarization dependent distribution of extraordinary modifications along the light propagation direction is observed.
Femtosecond Bessel beams are demonstrated for high aspect ratio machining in the filamentation regime with water assistance. Taper-free microchannels and micro-trenches are demonstrated with aspect ratio up to 40 and diameters down to 2 µm.
We present experimental and theoretical work on excimer laser microstructuring of hydrogenated amorphous silicon (a-Si:H) films on molybdenum coated glass substrates, in the form of sharp and conical poly-Si spikes, for electron field emission applications.
We present easy-scalable pulse recompression method based on spectral broadening due to self phase modulation in bulk medium. Our experiment demonstrates a possibility of compression of high-energy pulses above 1J from 30 to 14 fs.
Sensitive in-situ measurement systems for differential absorption and photoluminescence were developed to evaluate E' center, ODC(II), and NBOHC. The change of their concentrations by ArF irradiation were successfully observed in highly transparent synthetic silica glass.
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