Laser pointers
Laser pointers make use of small laser for drawing attention to certain spots. Basically, there are two types of laser pointers, one with green laser and one with blue laser. Green one is less expensive than blue laser. This price difference is because of the processes used for generating beams, the components used and the volume they are manufactured in.
Both the laser beams make use of diode but they are different in the optical coating and infrared red that produces them. Green laser pointers produce 1064 nms of infrared light while blue ones only produce 946 nm. Thus, blue laser pointers need larger pump diodes, adding to their cost. Green laser has better visibility and thus is in more demand. Green laser pointers are widely used in burning, astronomy, pointing and signaling.
Laser pointers should be used carefully as they may result in flash blindness, after images and glare, thus may cause an unwanted accident.
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