Green laser Pointers appeared on the market around 2000 and are the most common DPSS green laser pointer (also known as frequent-doubling diode pumped, solid-state DPSSFD). They are more complex than standard red laser Pointers because laser diodes are not common in this wavelength range. Green laser Pointers appeared on the market around 2000 and are the most common DPSS lasers (also known as frequent-doubling diode pumped, solid-state DPSSFD). They are more complex than standard red laser Pointers because laser diodes are not common in this wavelength range. Blue Laser Pointer: Blue laser Pointers of a specific wavelength, such as 473 nm, usually have the same basic structure as DPSS green lasers. In 2006, many factories began producing blue laser modules for mass storage devices, which are also used in laser Pointers. These are DPSS dual-band devices. They most often emit beams of 473 nm, which are diode-pumped Nd:YAG or Nd:YVO4 crystals (ND-doped crystals typically produce a D-main-wave length of 1064 nm, but other "higher-order harmonic" lengths can also be made with appropriate reflector coatings. Non major neodymium wave).
For high output power, BBO crystal is used as a frequency doubler; For lower power, KTP is used. Nichia, a Japanese company, controlled 80% of the blue laser diode market in 2006.In recent years, 593.5nm orange laser Pointers began to appear. September 2005 473nm blue laser pointer. In early 2010, a 405nm blue and purple laser pointer. The apparent brightness of laser spot depends not only on high powered laser power and reflectivity, but also on human color perception. For example, because the human eye is most sensitive to green light with wavelengths of 520-570 nm in the visible spectrum, and less sensitive to red or blue wavelengths, green light with the same watt-number appears brighter than other colors.