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High Power Laser Windows

by Rogers Gislason


High power laser windows are parallel windows made from low scatter excimer grade Ultraviolet Fused Silica that is optimized for high power laser systems. The surface of the high-power laser window is coated with high efficiency, high damage-threshold antireflection coating agent. This laser window construction mostly consists of excimer grade ultraviolet fused silica, with surface flatness of λ/10 @ 632.8 nm, and 3.0mm thick. High power laser window Is used in many industrial applications. High power laser window systems are getting more popular and widely used in industry and military affairs. It is necessary to develop a high-power laser system that can operate over long periods without appreciable degradation in performance. When a high-energy laser beam transmits through a laser window, permanent damage may be caused to the window because of the energy absorption by window materials. It is therefore important to design a high-power laser system, a suitable laser window material must be selected and the laser damage threshold of the window must be known. This lensing system requires low spherical aberration and a low absorption coefficient and high thermal conductivity to avoid a distortion of the transmitted wavefront due to thermal lensing. High energy lasers windows are designed to be used as a safeguard for the more expensive optics inside the laser cutting head. They are placed as the last optics before the workpiece. Lasers are devices that can produce a sharp, bright beam of light.  Laser is one of the most significant technological inventions. High power Lasers window now find widespread application in an incredibly diverse range of duties, including reading compact discs, printing paper, scanning bar codes, machining and welding, precision surgery, finding distances, enabling high-speed communications, guiding precision munitions, and driving controlled nuclear fusion. The production of high power is the operation of a laser. Custom Laser delivered quite high power by the standards of a typical continuous light source, particularly one delivering light of only one well-defined color.  The ability to produce high powers with lasers stems from the quantum mechanics that enable their operation. You can get the best fused silica cylindrical lens. The active atoms or molecules in the laser system can be in gaseous forms, such as the neon atoms in the ubiquitous helium-neon laser known well to students in laboratory classes, or the carbon-dioxide molecules in many welding lasers. They can also be semiconductor materials, such as the gallium arsenide used in the diode (or solid-state) lasers of CD players. Or they can be embedded in crystals, such as the chromium ions in ruby. In the electron of a laser medium, the atom must be excited with energy. This feat is accomplished in many ways, such as by creating a high-voltage discharge in gases of the helium-neon laser, causing current to flow through the semiconductor of a diode laser, or shining a light on crystals such as ruby with bright electric-arc lamps. When the electrons in a laser material’s atoms are in the excitation state, they can only acquire energies,  in specific quantum-energy levels. When the electrons are pushed to a higher quantum level, they can retain that energy for some time, called the “lifetime” of that quantum level.  The light that is traveling at a specific wavelength passes near these atoms within a high power window, the energy stored by the excited electron is extracted by stimulating the electron to drop back to a lower-energy quantum state. Thus the electron gives its energy to the passing light photons and effectively amplifies the passing light beam. Sometimes the laser acts as an energy storage device, which releases previously-stored energy into a beam or pulse of photons. If conditions are set up correctly, energy can be pumped into the electrons of the laser’s atoms over a long period, and then it can be released quickly, resulting in the production of a pulse of light with high peak power. The exciting laser gain material is placed between two mirrors, an optical laser cavity,  that light circulates back and forth through the laser gain medium, extracting the energy stored by electrons pumped into the upper quantum state. By coating the front faces of the laser gain rod so that they reflected light (with a small amount allowed to leak out on one side to deliver the laser output). 


Application Of High Power Laser Windows

  • Laser accelerator and laser nuclear physics
  • High Energy Density Physics, laboratory astrophysics, and geophysics
  • Cancer therapy by laser-driven ion beam
  • Production of PET(Positron Emission Tomography)  isotopes
  • Nuclear transmission by laser-driven rays
  • Pulse neutron by source by lasers