jackery's blog

There are many different types of high power laser pointer. According to the color classification, there are green, red, blue, purple, etc. The more common ones are green and red laser pointers; there are also different colors of laser pointers classified by wavelength; secondly, they are classified according to power. High-power laser pointers also have low-power laser pointers because the eyes can follow the laser beam along the entire length of the laser beam. On the other hand, many red laser pointers have no visible beam unless they are very powerful. When the laser is in contact with the solid, the human eye can only reliably pick up the red dot.

Some manufacturers are now selling bundled diode blue laser pointer with a measuring power of more than 1,500 MW. However, since the claimed power of the "laser pointer" product also includes IR power (only in DPSS technology), there is still a beam (the reason is described below), and the comparison based on the strictly visible blue component from the DPSS-type laser is still problematic. And the information is often unavailable. Due to the use of high-order harmonic neodymium and the low frequency doubling conversion efficiency, in the optimized DPSS module, the ratio of IR power converted to 473 nm blue laser is usually 10-13%, which is about the typical value of green laser Half (20-30%).

Blue lasers can also be made directly with 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 Nichia NDB7K75 diodes, continuously output more than 5 watts of energy when overloaded. These devices are brighter than 405 nm violet laser diodes at the same power because the longer wavelength is closer to the maximum sensitivity of the human eye. The mass production of laser diodes used in commercial equipment such as laser projectors is driven by price.