The basic structure of blue and purple lasers
The specific wavelength of the blue laser pointer, such as the 473 nm blue laser pointer is, in general, having the same basic structure as the DPSS green laser. In 2006, many factories began manufacturing blue laser modules for mass storage devices, which are also used in laser Pointers. These are DPSS type doubler devices. They typically emit beams of 473 nm. It is produced by doubling the emission frequency of the 946 nm laser from diode-pumped Nd:YAG or Nd:YVO4 crystals (Nd-doped crystals typically produce a primary wavelength of 1064 nm, but the correct reflection. The laser industry has four levels of high powered laser safety classification. You can operate the blue laser pointer at every corner. Class I: low power laser (power less than 0.4MW), regardless of the eyes and skin after focusing the optical system does not exceed the MPE value. Can you provide construction safety without any special controls? Laser pointer, CD player, CD-ROM equipment, geological exploration equipment, laboratory analysis and other commonly used instruments.
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A purple laser designator, GaN (gallium nitride) semiconductor can be used to emit a 405 nm purple beam. This is near ultraviolet light, near the limit of human vision, which fluoresces brightly in blue. As a result, on many white surfaces (white clothing, white paper, projections, etc.), blue spots look far away instead of purple spots. Fluorescent brighteners are widely used in product manufacturing to appear bright white. At the same time, there are already several higher drive (120 mW) 404-405 nm "purple" laser Pointers on the market. Although they are not based on GaN, they use DPSS frequency doubling technology and a 1 watt 808 nm GaAlAs infrared diode laser. . Like the infrared powered green laser pointer above, this type of device can pop balloons to ignite games due to the presence of unfiltered high-power infrared components in the beam.
2021-11-03 09:45:43
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