Quality Audit of green laser pointer

green laser pointer has no harm or damage to the human body. High myopia with posterior staphyloma persons; 2 average initial preoperative central corneal curvature less than or greater than 47D 39D should be careful; 3 dark light, the pupil diameter greater than 7mm; 4. Contralateral eye as legal blindness; 5.2 years, suffered from herpes simplex keratitis; 6 mild cataracts; 7 has a history of retinal detachment and macular hemorrhage; 8 mild dry eye; 9 mild blepharophimosis dysraphism; 10 patients with suspected glaucoma ; 11 menstrual period and pregnancy; 12 physical scars; 13 diabetes; 14 with a fever and other physical discomfort; 15 epilepsy; 16 anxiety disorders, depression, and those who expect too much of the surgery. 1917: Albert Einstein that "stimulated emission" theory, a photon makes the excited atoms emit an identical photon. 1953: American physicist Charles Townes microwave lasers to achieve a predecessor: microwave amplification by stimulated emission (English acronym maser). 1957: Townes's doctoral student Gordon Gould created the "laser" This word, from the theory that the excited atom can be used up to produce a bunch of coherent light beam, after it applied for its patent-related legal disputes lasted nearly 30 years.
Work is defined as the laser material to achieve and maintain population inversion and the body to provide energy sources or devices. According to the work material and the different laser operating conditions, can take different incentives and incentive devices common are the following four. ① optical excitation (optical pumping). Is the use of external light source to emit light irradiation the working substance in order to achieve population inversion, the entire incentive device, usually by gas-discharge light sources (such as xenon, krypton lamp), and condenser components, such incentives also known as Lamp-pumped. ② gas discharge excitation. Work is the use of the material in the gas within the gas discharge process occurs to achieve population inversion, the entire incentive devices typically discharge from the discharge electrodes and power supply components. ③ chemical excitation. Substances at work is the use of chemical reactions that occur within the process to achieve population inversion, and usually requires an appropriate chemical reaction and the corresponding trigger measures. ④ nuclear excitation. Is the use of small nuclear fission reaction fission fragments produced by high-energy particles or radiation to stimulate the work material and to achieve population inversion. Usually caused by a certain geometry and optical properties of the two reflection mirrors a combination of a specific way.