Monochromaticity of the laser
Monochromaticity-The energy of a photon determines its wavelength through the relationship E = hc / λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength. The energy of all photons emitted by an ideal laser is exactly the same, so the wavelength is also the same, and it is a perfect monochromatic laser. Many applications rely on monochromaticity. For example, in the field of telecommunications, multiple lasers with slightly shifted wavelengths can transmit pulse streams in parallel along the same fiber without crosstalk. Real lasers are not completely monochromatic, because several broadening mechanisms broaden the frequency (and energy) of the emitted photons. For example, the line width of a free-running YAG laser can reach hundreds of GHz, while the line width of a stabilized diode YAG laser can be less than 1 kHz.
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These tests are conducted on randomly selected commercial laser equipment labeled Class IIIa or Class 3R and sold in a manner suitable for use in classrooms and other public places. This laser is restricted in CFR to a maximum emission of 5 mW in the visible part of the spectrum and less than 2 mW in the infrared part of the spectrum. Approximately half of the test equipment emits at one or more wavelengths at a power level that is at least twice the CFR limit. In 2011, Rheinmetall successfully developed a 10-kilowatt air defense high power laser pointer cannon and successfully destroyed the "Tire-1" UAV. In the same year, the Israeli army launched a military crackdown in the Gaza Strip, using advanced laser pointer tactics and optical fire control of Hamas’ anti-tank The missiles are dazzling. This year, Lockheed Martin successfully used a new damaged laser pointer in the first field test one mile away from the engine of a small truck. Without ammunition, laser weapons can hit the target at the speed of light, and the shooting cost is high, which will fundamentally change the way of fighting.
2022-01-08 09:55:15
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