Three-dimensional characterization of modifications in sapphire exposed to laser-induced damage using multimodal spectral microimaging.

Sapphire (AlO) is a commonly used dielectric material with many applications in lasers and optical systems. Owing to its high resistivity to laser induced damage, it is particularly suitable for use in high power laser systems. This work focuses on developing techniques to characterize material modifications in sapphire.

Distinctive molecular configuration of nanostructured silica deposited at a glancing angle.

Glancing-angle deposition (GLAD) produces nanostructured silica, showcasing form birefringence, an attractive alternative to traditionally used crystalline materials for polarization control. This work aims to enhance the understanding of its internal structure and associated defects in its native form and after laser processing. Our observations show, for the first time, that the GLAD silica exhibits a unique Raman signature that converges to a typical silica spectrum following laser melting.

Laser-induced damage-growth threshold at 351 nm in the nanosecond regime in dielectric coatings employing different high-index materials.

The laser-damage performance of HfO/SiO and AlO/SiO mirrors was investigated at a laser wavelength of 351 nm with nanosecond pulse durations. A method was developed to quantify the laser-induced damage-growth threshold under conditions relevant to high-repetition-rate, large-aperture laser systems. The results suggest that the damage-growth performance cannot be inferred from the corresponding damage-initiation threshold that is commonly used to evaluate the performance of optical materials.

Making a Financial Case for the Geriatric Surgery Verification Program.

Mini abstract The financial benefits of instituting the American College of Surgeons Geriatric Surgery Verification Program far exceed the costs, with the added benefits of enhanced patient satisfaction and improved staff morale.

Three-dimensional modeling of electric-field enhancement in multilayer dielectric gratings arising from inadvertent flaws.

Pulse-compression gratings for high-power, short-pulse laser systems are exposed to high electric fields that are further enhanced locally due to their 2D nanostructured surface. This makes them vulnerable to laser-induced damage. The present work considers the effect on electric-field modulation caused by an array of commonly found inadvertent flaws in gratings including fabrication defects, contamination particles, and laser-induced-damage initiation.