Laser tube bending is a flexible forming process. Two irradiation methods of axial and circumferential scanning are generally used to form metal tubes. The two most important disadvantages of circumferential scanning are its lower bending angle and the time interval required between each scan for cooling purpose. In this research, a novel cooling strategy during laser tube bending with circumfe...

Objective(s): Photo-thermal therapy (PTT) is a therapeutic method in which photon energy is converted into heat to induce hyperthermia in malignant tumor cells. In this method, energy conversion is performed by nanoparticles (NPs) to enhance induced heat efficacy. The low-cytotoxicity and high optical absorbance of NPs used in this technique are very important. In the present study, titanium di...

The kinetics and channels of laser energy redistribution in a target irradiated by a short, 1 ps, laser pulse is investigated in computer simulations performed with a model that combines molecular dynamics (MD) simulations with a continuum description of the laser excitation and relaxation of the conduction band electrons, based on the two-temperature model (TTM). The energy transferred from th...

one of the basic purposes in dental treatment is providing a painless treatment for patients. this purpose may be achieved by the application of laser in dentistry. low-level laser therapy (lllt) is an internationally accepted title for biomodulation with low-level lasers which we use to achieve ideal therapeutic effects. low-level laser therapy is a painless, reproducible, non-invasive, and wi...

introduction: the unprotected eye is extremely sensitive to laser radiation and can be permanently damaged from direct or reflected beams. the area of the eye damaged by laser energy is dependent upon the wavelength of the incident laser beam, duration of exposure and tissue characteristics. this study aims to investigate the effect of intense green light from doubled frequency neodymium-doped ...

The Nautilus Project was started in 1995 as a joint USIsrael feasibility study for using laser systems to defend against short-range artillery rockets. It has now matured into a successful laser weapon demonstration program – the Tactical High Energy Laser (THEL) Advanced Concept Technology Demonstration (ACTD) Program. By now the THEL Demonstrator has engaged and destroyed a large number of ar...

PURPOSE To study factors affecting laser energy levels required for neodymium: yttrium aluminium garnet (Nd: YAG) laser capsulotomy and to evaluate whether any correlation exists between applied laser energy levels and complications. METHODS The present study examined 474 consecutive patients for a number of factors including age, type of posterior capsule opacification (PCO), material and fi...

-This paper reviews br ief ly the theoretical understanding and properties of optical resonators. Starting from the theory of stable laser resonators, unstable resonators are discussed with emphasis on understanding the i r properties tha t ensure near diffraction limited performance of higb power lasers. The growing f i e ld of adaptive optics for laser transmission i s a lso examined as an ad...

the use of titanium and its alloys has increased in various industries recently, because of their superior properties of these alloys. titanium alloys are generally classified as difficult to machine materials because of their thermo-mechanical properties such as high strength-to-weight ratio and low thermal conductivity. laser assisted machining (lam) improves the machinability of high strengt...