AIM To evaluate chemically the effects of diode laser on fluoride uptake before and after laser irradiation of enamel surfaces. METHODS Crowns of 20 sound human teeth were halved and a 3 x 3 mm acid-resistant varnish uncovered window left for: A) no treatment; B) fluoride (Elmex gel); C) diode (fluoride + diode laser); D) diode (diode laser + fluoride). The dental surfaces were analysed using...

BACKGROUND High-fluence diode lasers with contact cooling have emerged as the gold standard to remove unwanted hair. Lowering the energy should result in less pain and could theoretically affect the efficacy of the therapy. OBJECTIVE To compare the safety and efficacy of a low fluence high repetition rate 810-nm diode laser to those of a high fluence, low repetition rate diode laser for perma...

The use of semiconductor diode lasers as pump sources for solid-state lasers was demonstrated as early as 1964.1 In the past few years the dramatic increase in output power of diode lasers 2 has made pumping of solid-state lasers practical. Recently it was shown that diode-laser-pumped Nd:YAG lasers offer advantages over lamp-pumped lasers, including high efficiency3 and good frequency stabilit...

We describe a compact, economic and versatile diode laser system based on commercial laser diode and a collimation tube, optically stabilized by means of feedback from a diffraction grating. Detailed instructions for the construction and operation of the diode laser system are presented. These instructions include machine drawings for the parts to be constructed. Our system offers single-mode o...

This paper analyses two schemes of single-stage diode-switched active filters used in new switching power supplies designs to improve the power factor. From the point of view of the power flow, the distortion reduction is based on the improvement of the power conversion processes. Most of the ca/cc switching power supplies consists of two separated parts: a rectifier – in most cases a diode bri...

We demonstrate a new thin-film graphene diode called a geometric diode that relies on geometric asymmetry to provide rectification at 28 THz. The geometric diode is coupled to an optical antenna to form a rectenna that rectifies incoming radiation. This is the first reported graphene-based antenna-coupled diode working at 28 THz, and potentially at optical frequencies. The planar structure of t...

Multilevel inverters offer several advantages compared to the conventional 3-phase bridge inverter in terms of lower dv/dt stresses, lower electromagnetic compatibility, smaller rating and better output features. This project presents a 9-level diode Clamped inverter using Sinusoidal pulse width Modulation techniques as the control strategies. The algorithm has been developed within the carrier...

To investigate the use of linear diode laser bars to optically stretch cells and measure their mechanical properties, we present numerical simulations using the immersed boundary method (IBM) coupled with classic ray optics. Cells are considered as three-dimensional (3D) spherical elastic capsules immersed in a fluid subjected to both optical and hydrodynamic forces in a periodic domain. We sim...

In this extended abstract we discuss vertical power electronic device architectures using low defect density (10 to 10 cm) bulk GaN substrates as the starting material and present recent advances. The avalanche capability and ruggedness of the 0.7mm p-n junction diode are supported by test results demonstrating the diode clamping of a 100たH (8mH) inductive load with an initial current of 10 (1....

Based on the conduction mechanism of vacuum trigger diode, an experimental scheme has been designed to research on the effect of voltage parameters on radiation characteristics of vacuum trigger diode. The factors, including charging voltage and anode-cathode voltage, affecting radiation characteristics of vacuum trigger diode are analyzed. Through measure and analysis of trigger current, the r...