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Laser Photomedicine and Biomedical Optics at the Oregon Medical Laser Center Oregon Medical Laser Center, Oregon Health & Science University, Portland, Oregon, USA. Hospital and university based research center for biomedical optics and medical laser applications.
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Optical properties of Melanin Melanin is a very complex absorbing material. Melanins from natural sources fall into two general classes.
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Melanin history Melanin appear to be instrumental for various brain functions, for the ear to hear, for the eyes to see. No blue or green colours would be seen in animal and plant kingdom without melanin
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Sam's Laser FAQ Laser Safety, Info, Links, Parts, Types, Drive, Construction
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Alexandrite production and Alexandrite Lasers The alexandrite laser was originally designed to be a fixed wavelength laser, but later was developed into a tuneable solid-state laser. Alexandrite rods are usually 0.3 to 0.7 cm in diameter and 7.6 to 10 cm long. Alexandrite lasers can be pulsed or continuous, depending on the requirements of the operation. The majority of medical lasers devices only deliver one wavelength of laser light, and the surgeon has to choose the right wavelength for the tissue involved. Some lasers can deliver two wavelengths of laser light but some are tuneable over a narrow range of wavelengths. Continuous wave lasers emit a steady beam for as long as the laser medium is excited. If this beam is held on tissue longer than the thermal relaxation time, excessive heat will be conducted into normal tissue delaying healing and increasing scarring. All continuous wave lasers may be pulsed, either mechanically or by electronic or photonic means.
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Basic Photomedicine Photomedicine includes both the study and treatment of diseases caused by exposure to light and on the other hand the diagnostic and therapeutic applications of light for detecting and curing disease.
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ENERGY TRANSFER IN SOLID-STATE LASERS Lasers can be classified according to the type of material used for the active (amplifying) medium and the temporal (time) characteristics of the output. In a "solid-state laser" the active medium is a solid material instead of a gas or a liquid. All solid-state lasers are optically pumped, which means that excitation of the active medium is achieved by the absorption of light. Solid-state laser operation may be either continuous wave or pulsed.
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PhotoBiology Course Photobiology is broadly defined to include all biological phenomena involving non-ionizing radiation. It is recognized that photobiological responses are the result of chemical and/or physical changes induced in biological systems by non-ionizing radiation.
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Skin optic properties In response to requests for a summary of skin optical properties, this article presents how to choose the approximate optical coefficients for absorption and reduced scattering of skin with variable amounts of melanin and blood perfusion. It is merely an approximation and a starting point for describing the skin optics of any particular individual.
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Excimer and Dye Laser theory Dye Lasers, Amplification, Doubling, Molecular Jets
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LASER SPECTROSCOPY Absorption and Emission processes.
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Laser Induced Fluorescence Structural information about the ground and excited states of molecules.
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Stimulated Raman scattering Stimulated Raman scattering
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Practical aspects lasers in physics and biology The basic processes of laser radiation with tissue interaction
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Laser Fundamentals All lasers exploit the principle of Stimulated Emission, in which energy transitions defined by quantum mechanics provide a source of photons. What makes Light Amplication by the Stimulation Emission of Radiation possible is a mechanism by which identical photons can be generated, captured, amplified and harnessed for use.
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What is a Laser ? Physics Laser is an acronym of Light Amplification by the Stimulated Emission of Radiation. The full name itself exhibits the major processes involved in laser production. Before we look into these processes, we must, first of all, understand the structure of matter, and the principles of light emission and absorption.
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Center for Biophotonics This course targets freshmen students that are part of the Integrated Studies Program. The course is a basic interdisciplinary exploration of the intersection of biology, physics, optics and technology with light. In addition to getting an overview of the science of biophotonics, doing hands-on experiments, and interacting with CBST scientists, the students in IST 8A have projects on how to communicate this new technology to middle and high school students and the general public.
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Ressources Lasers et applications Cours optique et lasers. Bases de connaissances et enseignement.
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Cours d'introduction à la physique des lasers Le laser fait partie de notre vie quotidienne. Pour preuve, voyez cet étrange individu qui rentre à Paris en avion: le lecteur CD qui lui diffuse son morceau préféré utilise un laser à semi-conducteur, tout comme l’imprimante qui lui a tiré le dossier qu’il est en train de lire. Et tout à l’heure, juste avant l’embarquement, le prix de la bouteille de parfum qu’il a acheté a été lu grâce à un laser à semiconducteur.
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Studying thermal effects of laser on tissue using implicit finite volume method Abstract: In this paper, thermal effects of laser irradiance on biological tissue is investigated using computer simulations. Earlier attempts in this field made use of finite difference and finite element techniques. Here a novel approach is adopted to improve the results. The effect of our implicit approach on the convergence procedure and accuracy of results, with different timing steps, is explored. Monte Carlo method is used in combination with the finite volume algorithm in order to obtain a profile of light distribution and heat transport in tissue. It is shown that implicit finite volume technique has not only acceptable accuracy, but also high stability for different timing steps.
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