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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.
We design and demonstrate an efficient fourth-harmonic generation scheme for obtaining femtosecond pulses near 200 nm from the output of a moderately tunable Ti:sapphire ultrafast amplifier. Overall per pulse conversion efficiency of 1.8% is reported.
Super-luminescent jet light is produced via disrupted conical emission excited by focused millijoule 50 fs laser pulses in air. Phase-matching requirement of four-wave mixing at specific diffraction angles is responsible for the observed phenomenon.
Radially symmetric Airy optical beams exhibit a focus area that is strongly non-symmetric and abrupt. We use this unique feature to precisely deliver energy in the bulk of fused silica without affecting the preceding material.
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