The electrical and optical characteristics of GaN:Mg irradiated by a pulsed KrF ~248 nm! excimer laser have been studied. When an as-grown Mg-doped GaN film was irradiated by an excimer laser at an energy density of 590 mJ/cm in a nitrogen atmosphere, the hole concentration was drastically increased up to 4.42310 cm. Furthermore, a GaN:Mg thin film, which was treated by laser irradiation follow...

Human enamel surface was irradiated with ArF excimer laser and examined under light microscopy and scanning electron microscopy (SEM). Enamel surface was irradiated at three different areas with different energy fluences. It is demonstrated that the ArF excimer laser causes ablation of the calcified hard enamel tissue. Ablation curves were measured. There was no significant difference found in ...

The first commercial excimer laser was introduced 40 years ago by Lambda Physik (now Coherent; Santa Clara, CA). Interestingly, its developers— Bernd Steyer and Dirk Basting—were both chemists whose main goal was to develop a light source for photochemistry and dye laser pumping. As soon as excimer lasers entered the market, Lambda Physik began to investigate other possible uses for a powerful ...

BACKGROUND Little is known about the mechanism(s) in the development of restenosis after excimer laser angioplasty. Thus, the rationale of this study was to determine the time course of intimal and medial smooth muscle cell (SMC) proliferation and histomorphological changes after experimental excimer laser treatment. METHODS AND RESULTS Laser ablation was performed in the right carotid artery...

AIM To report the clinical presentation, surgical management, and outcome of retinal detachment following excimer laser. METHODS Retrospective analysis of retinal detachments observed in 11 eyes of 10 myopic patients who had previously undergone photorefractive keratectomy (PRK) or phototherapeutic keratectomy (PTK) by excimer laser. RESULTS Symptoms of visual loss in two eyes were initiall...

We have developed a measurement system based on a correlation method to characterize the nonlinearity of a detector's response over a large range of laser pulse energy. The system consists of an excimer-laser source, beam-shaping optics, a beam splitter, a monitor detector, a set of optical filters, and the detector under test. Detector nonlinearities as large as 10% or greater over an entire m...

PURPOSE We describe a modified surgical technique for the treatment of patients in the early stage of keratoconus, when it is still possible to correct the astigmatic ametropia with contact lenses. METHODS Excimer laser lamellar keratoplasty of augmented thickness (ELLKAT) is a procedure in which a deep plano excimer laser ablation is done on the host cornea and a donor lamellar button--with ...

Introduction:Vitiligo is an acquired idiopathic disorder characterized by hypochromic and achromic well-delimited macules.The 308 nm excimer laser can be used to treat this condition. Objective: To analyze studies published in indexed medical journals on the use of the 308 nm excimer laser in the treatment of vitiligo. Method: Adopting a qualitative approach, a survey of related articles from 2...