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We investigate the transmission of a cw laser interacting with rubidium vapor and a frequency comb. The results reveal various regimes of competition and the importance of optical pumping and power broadening of the lasers.
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.
Harmonics up to the 15th order are produced from solid targets using 3 mJ, 30 fs pulses focused to a spot size of 1.7 μm and 3 × 1018 W/cm2. Combined conversion efficiency to the highest harmonics is > 10-5.
We report formation of polarization-dependent nanostructures (nanolines, nanocircles) by high repetition-rate femtosecond laser pulses on titanium surface through a novel mechanism, converting Ti to TiO2. Arbitrarily large-area patterns are created by self-stitching of these patterns.
We report guiding, lasing action and performance characterization at around 1.9 μm from an ultrafast laser inscribed channel waveguide in a Tm3+-doped fluorogermanate glass.
Generating circular polarization for ultra-intense lasers requires solutions beyond traditional transmissive waveplates which have insufficient bandwidth and pose nonlinear phase (B-integral) problems. We demonstrate a reflective design employing 3 metallic mirrors to generate circular polarization.
Photoporation (optical injection) of mammalian cells using a tightly focused femtosecond laser beam is demonstrated within a microfluidic chip, providing delivery of cells to the beam and thus automating the system for high cell throughput.
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