Do you understand the distance of the laser beam?
When the power of the green laser pointer beam is enough, the measuring range can reach about 40 kilometers or even farther. The laser rangefinder can operate day and night, but when there are materials with high laser absorption rate in space, the distance and accuracy of its ranging will decrease. Have yellow laser Pointers emitting 593.5 nm been available in the last few years? Based on the DPSS process, in this case, two Nd laser lines (YVO4, 1064nm and 1342nm) are added to the nonlinear crystal. Due to the complexity of the process, these laser Pointers are inherently unstable and inefficient. The power spectrum ranges from 1mW to about 10mW and varies greatly with temperature. For hot or cold temperatures, it is usually in jump mode. This is because complex processes may require temperature ballasts and active cooling that cannot be installed on small mainframes.
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Blue lasers can also be made directly using InGaN semiconductors, which can produce blue light without doubling the frequency. 450 nm (447 nm plus/minus 5 nm) blue laser diodes are still available on the open market. Some blue diodes can provide very high output. Like the NichiaNDB7K75 diode, it consistently outputs more than 5 watts of power when overloaded. These devices are brighter than 405 nm purple laser diodes with the same output. This is because the longer the wavelength, the closer it is to the maximum sensitivity of the human eye. Mass production of laser diodes, used in commercial equipment such as laser projectors, depends on price. High-performance versions of the 447 nm pointer are very popular now, reducing collimation and divergence for better optics.
2021-12-06 12:49:26
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