Laser Repair: Laser Operating Principles, Laser Equipment Manufacturers – Laser Equipment
08/06
2020
Laser Repair The manufacturer shares the operating principle of lasers:
Laser light is light emitted through stimulated emission. The principle behind laser emission is to ensure that stimulated emission becomes the dominant process. To achieve this, two conditions must be met: first, population inversion must be realized; second, the gain must exceed the losses.
1. Achieve particle number inversion
We know that the distribution of particles across energy levels follows the Boltzmann distribution. At room temperature, most particles occupy low energy levels, while no particles are found in high energy levels. With temperature as… T = 3000K , launch 500 Take nanoscale visible light thermal radiation sources as an example, N2 / N1 Far less than 1 …indicating that the intensity of stimulated emission is far less than that of spontaneous emission, to the extent that stimulated emission can be neglected. Stimulated absorption (photon absorption) significantly reduces the number of photons in the system. Population inversion refers to the process of increasing the population of higher energy levels… E2 The quantity N2 Far greater than the low energy level E1 The quantity N1 Lasers use excitation pumping systems—primarily optical excitation or gas discharge excitation—to achieve population inversion.
2. Gain is greater than loss.
In a laser, the optical resonator reflects the first emitted light through the laser output mirror, then amplifies it once more to complete positive feedback. During the process of back-and-forth reflection, the initially very small light is amplified to a very high light level (referring to… 1 (magnifying to an extremely large number of photons), thereby achieving population inversion. All of the system’s energy is concentrated in this direction, and in the end, a small fraction of the light inevitably leaks out through the output mirror and is coupled out—this is the output laser. During this amplification process, some losses do occur in other directions as well; however, overall, thanks to the amplifying effect of the resonant cavity, the gain exceeds the losses. The additional function of the optical resonator further narrows the laser’s frequency spectrum. For a fixed resonant system, it can only respond to a single frequency or one of its harmonics (for example, when you pluck a string between two points on a guitar and change the distance between those points, you produce sounds of different frequencies). The two mirrors within the resonant cavity act as fixed nodes, much like the ends of a taut string: light waves are reflected back and forth, and their interference is constructive only when the wavelength of the light is an integer multiple of half the optical path length; otherwise, the waves interfere destructively. This results in an exceptionally narrow frequency range, ensuring that the output laser beam travels in a single direction and that its wavelength is highly concentrated. Lasers exhibit extraordinary monochromaticity, exceptionally strong spatial coherence, and incredibly high spectral brightness. Laser beams are nearly perfectly parallel, all pointing in the same direction. Thanks to these remarkable properties, lasers have found widespread application across numerous fields since their invention.
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