Monochromatic light, where all photons possess the same wavelength, was not possible until the invention of lasers in 1958. Lasers produce light by stimulating specific electron transitions repeatedly, leading to powerful and varied wavelengths. However, there is a fundamental limit on energy density in lasers. Exceeding this limit is impossible due to constraints from the laws of physics, preventing endless accumulation of photons.
Lasers, invented in 1958, allow for the production of truly monochromatic light through stimulated emission, achieving specific wavelengths and building photon density in a cavity.
While lasers can produce high energy densities, a fundamental limit exists beyond which no more photons can be accumulated, dictated by the laws of physics.
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