Excimer laser ablation of gold films deposited on a quartz crystal microbalance is investigated. The ablation rate is directly obtained from the frequency shift of the microbalance. The measured single-shot ablation rate is found to be at least two orders of magnitude higher than the numerical predictions based on a surface vaporization model. Surface morphologystudies indicate that hydrodynami...

This paper describes an optical approach to verify the geometric accuracy of object surfaces structured by an excimer laser. Due to the restricted space in the excimer laser system a passive optical approach is chosen to be integrated in the system. Different optical techniques are compared. Their advantages and disadvantages for the use of integrating them in a laser system are discussed in th...

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...

PRK in human eyes was first performed in 1988. It involves removal of corneal epithelium followed by application of Excimer laser and has been proven to be safe and effective method of low to moderate power correction of myopia upto-6D (I). LASIK involves creation of a corneal flap with an automated microkeratome, followed by Excimer laser ablation of the stromal tissue. LASIK is being performe...

Pyrene and pyrene-labeled poly(acry1ic acid) were used as fluorescence probes to investigate the interactions between poly(acry1ic acid) and dodecyltrimethylammonium bromide. The polarity dependence of the vibrational structure of the pyrene emission spectrum indicated the formation of micelle-like surfactant aggregates at concentrations that are significantly below the critical micelle concent...

The corneal sensibility was examined with the aesthesiometer of Draeger in 41 patients after refractive corneal surgery, 31 patients after radial keratotomy, 5 after epikeratophakia, 5 after excimer laser ablation. It could be shown that after radial corneal incisions the sensibility remains normal. After epikeratophakia the corneal sensibility is asensible even 3 years after operation. The len...

BACKGROUND Progressive hyperopia is a common complication following radial keratotomy. METHODS Ten eyes of ten consecutive patients with hyperopia after radial keratotomy between +1.75 and +4.00 diopters (D) were treated with the hyperopia module of the Nidek Model EC-5000 excimer laser. The mean preoperative uncorrected visual acuity was 0.38 (20/60+). RESULTS After excimer laser photorefr...

Palmoplantar psoriasis (PPP) presents with typical scaly patches sometimes studded with sterile pustules. It is chronic and recalcitrant to therapy; it often causes itching, burning, painful ragades and can lead to severe disabilities (1). Some preliminary works (2-4) have established that an excimer laser-generated 308 nm UVB radiation is effective in the treatment of psoriasis. In our study, ...