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The rapid fabrication of a periodically poled waveguide in potassium titanyl phosphate crystal using tightly focused femtosecond laser pulses, and utilised for second-harmonic generation to the green by an all positive dispersion ytterbium-fibre laser-amplifier, is demonstrated. A maximum average SHG power of 104.4 mW was measured for the 10 mm-long waveguide under optimal singlemode propagation....
The clamped intensity of a plasma-filament induced by a femtosecond laser pulse in one-atmospheric-pressure helium was measured. The measured electron density of ~7times1017cm-3 corresponds to a clamped intensity of about 7.8times1014W/cm2.
R-FIBS is used for probing salt water aerosol. We demonstrate experimentally that it can be used to sense ppm level concentrations up to 70 m away and shows potential for kilometer range applications.
We present a spectroscopic way to measure the plasma density of femtosecond laser filaments in air by using Stark broadening of the oxygen atomic fluorescence line. This method could also be applied to multiple filamentation.
The competition between optical breakdown and filamentation in bulk fused silica is analysed using a 1 kHz femtosecond infrared laser. The writing conditions (focal length, pulse energy) corresponding to the onset of these two phenomena are investigated.
The backscattered fluorescence of nitrogen from long filaments generated by intense ultrafast Ti-sapphire laser pulses propagating in air is studied. It shows an exponential increase with increasing filament length, indicating amplified spontaneous emission (ASE).
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