How to choose power for 445nm laser pointer?
"Classical" lasers produce ultrashort laser pulses designed to maximize the coherence of the emitted beam. In particular, it tries to obtain "single-mode" radiation by manipulating the shape of the laser cavity. That means we just want to allow radiation in very precise directions and lengths and very precise waves. However, Heisenberg's uncertainty principle forbids pulses that are too short for a single-mode laser. Laser pulses cannot generate ultra-short, high-power high powered laser pulses in one step. Therefore, short pulses must first be generated and then amplified to the desired power level. However, short pulses have sufficient power to potentially damage passing optical devices...... after amplification Includes laser pointer recommended amplifier crystals! Therefore, during amplification, you need to use a specific technique called "frequency drift amplification." The technology was developed in 1985 by Gerard Mrou's team at the University of Michigan.
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As you may know, green light lasers are much more powerful and are generally classified as Class 3A lasers in the United States because they measure less than 5 milliwatts. However, be aware of label permissions. According to a 2013 test conducted by the National Institute of Standards and Technology (NIST), 44% of green and red laser beam tests (a total of 122 laser tests) would be about 90% if they did not meet federal safety standards. More worryingly, nearly half of the test Pointers emitted beams that were twice as strong as the limit set by federal regulations.
2021-12-02 12:23:27
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