Why are white lasers the hardest to make?
Scientists and engineers at Arizona State University have created a white laser for the first time in a paper published in the journal Nature Nanotechnology. "Although past research has created red, blue, green, and other wavelengths, each laser typically emits only one color of light," the paper notes. Create a laser that can emit red, green and blue at the same time. Overall color installations are difficult because they require a combination of semiconductors on a single chip. However, placing these mismatched crystals one after another can cause some fatal defects.
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In fact, "white laser" is not a white laser in the strict sense, because it does not directly emit white light, but by red, green, blue three colors of white light synthesis. We can think of it as a broad white laser. In fact. From a basic point of view, it can still produce a laser of high monochromaticity, but it combines three wavelengths of light to create "white light". As an artificial light source, lasers always come in red, green and blue colors. Primary color forms exist; Because of its unique "three good and one high" characteristics (good monochrome, good coherence, good direction, high brightness), it has been widely used in many fields. Due to the limitation of the laser produced by the laser, the monochromism of the laser is better, but this has also become a shortcoming of the laser in the application field; Lasers can not produce any wavelength lasers, nor can they produce supercontinuum, ultra-wideband lasers. In the field of laser application, Laser pointer is widely concerned. There are different requirements for frequency (or wavelength), where nonlinear crystals are needed. However, lasers at many wavelengths still cannot be manufactured.
2021-09-27 12:22:15
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