A pulsed tunable dye laser has been described which can generate intense, highly monochromatic, tunable radiation throughout the visible spectrum. Pumped by a nitrogen laser, it achieves bandwidths of less than 0.004 Angstroms with the help of a diffraction grating in Littrow mount together with an intracavity beam expanding telescope and a tilted Fabry Perot interferometer. [The SCI indicates ...

Experimental evidence is presented that shows that the conical emission often found surrounding a near-resonant laser beam after it passes through an atomic vapor is due to nondegenerate four-wave mixing enhanced by the ac Stark effect. We demonstrate self-trapping of a pulsed dye-laser beam in sodium vapor for wavelengths 0.04 to 10 A shorter than that of the D(2) resonance and show that the f...

A laser photochemical process is introduced to realize superhydrophobic conducting carbon coatings with broccoli-type hierarchical morphology for use as a metal-free counter electrode in a dye sensitized solar cell. The process involves pulsed excimer laser irradiation of a thin layer of liquid haloaromatic organic solvent o-dichlorobenzene (DCB). The coating reflects a carbon nanoparticle-self...

INTRODUCTION Trichophyton rubrum is one of the most common species of dermatophytes which affects superficial keratinous tissue. It is not especially virulent but it can be responsible for considerable morbidity. Although there are different therapeutic modalities to treat fungal infections, clinicians are searching for alternative treatment because of the various side effects of the present th...

Weld area and weld depth/width ratio can be considered to be of the most important geometrical factors in pulsed laser welding. The effects of carbon dioxide and oxygen additions to the argon shielding gas on the weld properties in pulsed laser welding of low carbon steel is investigated. Presence of carbon dioxide and oxygen up to 10 and 15 percent respectively decreases the weld geometrical f...

BACKGROUND The increase in the number of laser treatments has led to an increase in the number of therapy-related adverse effects. Herein we report a case in which long-term adverse effects occurred after periorbital laser treatment of a treatment-resistant port-wine stain using a long-pulsed alexandrite laser without protective eyewear. OBSERVATIONS A 33-year-old woman with a therapy-resista...