The defects generated by the catastrophic optical degradation (COD) of high power laser diodes have been examined using cathodoluminescence (CL). Discontinuous dark lines that correspond to different levels of damage have been observed along the ridge. Finite element methods have been applied to solve a physical model for the degradation of the diodes that explicitly considers the thermal and m...

Microstructured optical fibres (with a periodic transverse microstructure) are of interest since they offer a simple alternative to controlling the index profile of optical waveguides. Although many types of optical fibres and cables have been developed to meet the needs of communications service providers for longterm performance and reliable operation, the brittle nature, aging and fatigue of...

Deterioration of the glass of microscope objectives, telescope lenses, prisms and expensive optical glass of all kinds has always been a source of worry to those using optical apparatus in the tropics. Many theories have been advanced to explain this damage, but as far as is known few, if any, of these have ever been definitely proved. In the present investigation, one cause of the clouding of ...

Amorphous carbon optical coatings are often applied to optics on the new generation of free-electron lasers working in the XUV and soft x-ray spectral regions. The response of these coatings to short-wavelength radiation applied at relatively low fluence for long periods was investigated with a focused beam of high-order harmonics. Material expansion of several nanometers was found on irradiate...

UNLABELLED The optic nerve injury is produced by damaging the optic nerve within a craniocerebral trauma. The anatomo-pathology and the pathology of posttraumatic visual impairments are fundamental data for the therapeutic indications. The microscopic examination reveals only the particular cases of very serious or severe extensive lesions. Damage to the vessels of the optic nerve, damage and b...

We report photoacid-induced nonerasable recording in tert-butoxycarbonyl-protected quinizarin methacrylate polymers for three-dimensional optical memory. 1m/s-speed recording was achieved using an 800 nm femtosecond laser at an 80MHzrepetition rate, without a postexposure bake after laser irradiation. Three-layer recording indicates that no optical damage during recording enables modulation of ...

Peroxidase enzyme digests of oxidized single-wall carbon nanotubes (SWCNT) were shown to damage DNA in potentially genotoxic reactions for the first time using an electro-optical array with and without metabolic activation.

Optical remote sensing has gained major technology breakthroughs and outstanding merits in monitoring the urban areas in disaster conditions. However, any change detection procedure must be checked for its level of sensitivities to different aspects of the phenomenon, materials and aspects of changes. So far, pixel-based and object-based image processing algorithms have been well received and u...

The damage thresholds of five different types of quartz glass used for the production of spectroscopic cuvettes for liquids were determined with single temporal and spatial mode nanosecond pulses at 532 nm. One of the glasses had a damage threshold of ≃420 J/cm(2), which was more than twice that of the other glasses.

The focus of this paper is to summarize the current knowledge on visual pathway damage in neuromyelitis optica (NMO) assessed by magnetic resonance imaging (MRI) and optical coherence tomography (OCT).