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Comparison of high-resolution sub-surface microscopy shows that illumination with linear polarization resolves an edge with resolutions of 95 nm and 120 nm, depending on E-field orientation, while radial polarization achieves a resolution of 98 nm.
A concept for a spectrally resolved lateral-shearing interferometer is proposed to measure pulse front and radial group delay. A periodic slit in a spectrometer enables a simpler spatial interference scheme than a Mach-Zehnder interferometer.
Intensity modulation transfer in saturated amplifiers is simulated for different gains and spatial walk-off configurations. Pump-to-signal walk-off in high-gain amplifiers reduces modulation transfer. Increased transfer occurs at low gains, particularly with idler-only walk-off.
Near-field binary beam shapers based on error diffusion have demonstrated a damage threshold higher than 30 J/cm2. Their fabrication tolerance and operation with broadband pulses are investigated for application to short-pulse high-energy lasers.
High-damage-threshold liquid crystal devices based on optically aligned coumarin alignment layers have been fabricated to generate beams with radial and azimuthal polarization states.
Achromatic laser-beam shapers employing spatially varying twisted nematic liquid crystals (LC's) have been demonstrated for high-peak-power applications. The LC molecular orientation was achieved through photolithographic patterning of an alignment layer using polarized UV light.
A high-energy, high-contrast seed source for high-power lasers is directly generated using parametric amplification, with a temporal contrast better than 100 dB within 5 ps of the pulse peak and an extremely fast rising edge.
Beam apodization using binary amplitude masks designed with an error-diffusion algorithm is studied. High-shaping capability and predictability of mask properties is demonstrated for precompensation of the spatial gain variation of a glass amplifier.
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