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Common Laser Pointer Pen
The original laser pen is usually the He Ne laser which produced a wavelength of 633nm with a output power of 1mW. Nowady, there are many kinds of laser pointers such as green laser, blue laser, violet laser and yellow laser. Some lasers uses a deep red beam by a wavelength of 670/650nm is the cheapest in the market. However, lasers with a wavelength of 635nm are expensive. Besides,the 532 nm green laser is the most common lasers.
Green Laser Pointer
Some green lasers are designed to work in the pulse or quasi continuous mode to solve the problem of cooling. The green beam is visable in the night even a low power green laser pointer , this laser is often used by astronomy enthusiasts for pointing stars. Green laser pointer have a variety of output power from 5mW (IIIA) to 10000mw, and even in the dark environment the green beam still can be seen.
Red Laser Pointer
This is the most simple laser since there is only a red diode. This kind of laser came out in the early 1980s and worth three hundred dollars. However, they are much smaller today. Diode pumped solid state (DPSS) red laser is most common red laser pointer now.
Blue Laser Pointer
In 2006 many factories began production of blue laser modules for mass-storage devices, and these were used in laser pointers too. Blue laser pointer in specific wavelengths such as 473 nm usually have the same basic construction as DPSS green lasers.These were DPSS-type frequency-doubled devices. They most commonly emit a beam at 473 nm, which is produced by frequency doubling of 946 nm laser radiation from a diode-pumped Nd:YAG or Nd:YVO4 crystal (Nd-doped crystals usually produce a principal wavelength of 1064 nm, but with the proper reflective coating mirrors can be also made to lase at other "higher harmonic" non-principal neodymium wavelengths).
Yellow Laser Pointer
Yellow laser pen is extremely rare on the market. Yellow laser pointer beam is created by DPSS technology which combine the wavelength of 1064nm and 1342nm.The complexity process makes the laser pen unstable and low efficiency, its output power is easilly affected by temperature. In addition, these lasers are almost professional products that usually used at research.
Purple Laser Pointer
Blue violet laser pen emits a beam of 405nm that is similar to ultraviolet rays.The purple spot is very clear on many white surfaces, including white paper, white clothing, and projection screens, due to the widespread use of optical brighteners in the manufacture of products intended to appear brilliantly white. As with infrared-driven green laser pointers above, such devices are able to pop balloons and light matches, but this is as a result of an unfiltered high-power infrared component in the beam.By using the highest quality green laser diode and glazing design, this green laser line generation laser alignment tool uses the production technology and technology of telecommunication lasers to enter industrial laser production. The high-performance green line laser alignment produced has unparalleled advantages in various industrial production lines.