What is a laser cavity
The laser cavity or resonator is the core of the system. A single transmission through a group of excited atoms or molecules is sufficient to trigger the laser action in certain high gain devices (such as store pointer lasers). Excimer; However, for most lasers, multiple passes through the laser medium are required to further increase the gain. The simplest cavity is defined by two mirrors facing each other-a total reflector and a partial reflector, whose reflectivity can vary from 30% to nearly 100%. The light reflects back and forth between these mirrors, and its intensity increases each time it passes through the gain medium. The photons spontaneously emitted in directions other than the axis are simply lost and do not contribute to the green laser pointer operation. The laser beam allows high radiation power to be focused on a small area. Therefore, they are used to heat, melt or evaporate materials. Therefore, they are used in industry to pierce the hardest materials, such as diamonds, polish microelectronic components, heat-treat semiconductor chips, and even develop new plastics. It allows you to drill or cut very thick and wear-resistant materials with extreme precision.
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The ideal representation is a plane wave, which propagates in a flat wavefront along a given direction, and each plane perpendicular to that direction experiences the same electric and magnetic field amplitude and phase at any given time. When two waves with this characteristic interact, they create an interference profile, just like in Yang's experiment. The light reaches the back of the eye, the retina, where we perceive vision. What the eye actually sees is a small part of the electromagnetic spectrum, ranging from short cosmic radiant energy to long radio waves. Brightness (or more accurately, luminescence)-the most significant difference between very powerful lighters. Unlike traditional light sources, all the light emitted is in the same direction as the strong beam. Radiosity is defined as the amount of light leaving the light source per unit area and unit solid angle. A star like the sun emits a lot of radiation per unit area, but it emits in many different directions.
2022-01-08 09:57:06
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