What was the first laser?
The first laser pointer was a HeNe (HeNe) gas high powered laser, which produced 633 nanometer (nm) laser radiation. These pointers are usually designed to produce a laser beam with an output power of no more than 1 milliwatt (mW). According to the ANSI classification system (ANSI Z136.1-1993, the National Standard for Safe Use of Lasers in the United States), visible lasers (400-700 nm) with working power less than 1 mW belong to Class 2 lasers, and their flicker reflection can usually protect the eyes well. If a person deliberately overcomes their natural aversion response by looking at the light beam, the Class 2 laser may damage the retina.
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First of all, the technical content of the green laser pointer is not very high, it is mainly composed of several main components: battery compartment, circuit board, 808nm infrared laser diode (pump source), laser crystal (crystal Nd: YVO4, KTP crystal), expand Collimating lens group. Due to size limitations, 510nm / 515nm / 520nm / 525nm / 532nm laser pointers are unlikely to reach more than 2W. The word laser is actually an acronym for "amplifying light through stimulated radiation." Simply put, a laser is a beam of light, a beam of photons moving in the same direction. The intensity of any laser depends on the energy it produces, usually in milliwatts. Because these laser pointers come from faraway countries abroad, they are often missed by the safety hazard stickers required by the FDA.
2021-11-11 08:24:37
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