The brightness of green laser pointer
The first was born in 1970 excimer laser, which uses strong electron beam excitation of liquid xenon, xenon excimer lasing get the role, the laser wavelength of 1720 angstroms. Subsequently, the gas xenon excimer molecules and other rare gases, rare gas-oxide excimer (oxidation krypton, xenon oxide, oxidation argon, etc.), metal vapor – noble gas excimer (xenon sodium, etc.); rare gas compounds quasi-single-tooth molecules (fluorinated xenon, argon fluoride, krypton fluoride, xenon chloride, bromide, xenon, xenon iodide, chloride, krypton, etc.), metal gear excimer compounds (mercuric chloride, bromide, mercury, etc.) and quasi-metal molecules (sodium excimer, etc.) gradually born. Higher the power of laser is, brighter the 50mW blue violet laser pointer light is.Excimer laser material with a lower state of exclusion, it can be effective in taking the time, so no low-state absorption and energy loss, inversion is very easy to gain a large, high conversion efficiency, repetition rate, the radiation wave length, the main in the ultraviolet and vacuum ultraviolet (extended to the visible minority) area oscillation, wide tuning range. It isotope separation, UV chemistry, laser spectroscopy, fast photography, high-resolution holography, laser weapons, material structure, optical communications, remote sensing, integrated optics, nonlinear optics, agriculture, medicine, biology, and pump tunable dye lasers, etc. have been more widely used, and is expected to develop into the laser for nuclear fusion devices.Lower the laser power is, dimmer the green laser pointer light would be. In the medical field using laser types are more commonly used in ophthalmic treatment are ruby (rudy) laser, argon ions (Ar +) laser, krypton (Kr +), dye (dye) laser, neodymium-doped yttrium aluminum garnet ( Nd: YAG) laser and argon fluoride (ArF) excimer laser and other solid, gas and liquid lasers, with continuous, pulsed and Q-switched mode, the bottom of the eye treatment refractive pigment membrane and other parts of the number of ten kinds of related eye diseases. Excimer laser used in ophthalmology, is argon (Argon) and fluorine gas (Fluoride) of working gas produced by the 200mW green Laser Pointer. The so-called excimer laser, is excited dimer (inert gas and halogen two elements) generated by the laser, the wavelength range of 157 ~ 353nm, respective UV laser band.China has no specific definition in green laser pointer using. Now for the clinical argon fluoride (ArF) produced a mixture of extreme-ultraviolet wavelength of 193nm cold laser. The wavelength of 193nm ArF excimer laser for refractive surgery is the mechanism of photochemical effects. Excimer laser single photon energy is about 6.4eV, and corneal tissue in the peptide bond and the combination of carbon molecules bond energy of only 3.6eV. When the high-energy photon radiation to the cornea, directly break molecular bonds within the organization, leading to fragmentation and to achieve ablation of corneal tissue cut the organization’s purpose, and because the excimer laser pulse is short (10 ~ 20nm), but also photochemical effect removal. China has no specific definition on the laser power in 100mW green laser pointer using.Therefore, the mechanical removal of surrounding tissue damage and thermal damage to small (<0.30m). With this knife Shi Xingguang resection, the cutting precision can reach m level, the blade damage only to the extent of nm level, and because no thermal effect and will not damage the adjacent tissues. It has been used in corneal surgery, such as corneal refractive surgery, corneal scar removal and so on. A use of free electron lasers stimulated emission of free electrons, the energy of the relativistic electron beam into coherent radiation of the laser device. Stimulated emission of free electrons idea was proposed in 1951 by Motz, and experiments conducted in 1953, due to time constraints, could not be confirmed.
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