Among all visible lasers and invisible IR lasers, green laser pointer is always my first choice. Available with special laser wavelength of 532nm, it just stands in the middle of optical spectrum. Comparing with other visible lasers, green color laser light is the most sensitive one to human eyes. Especially when green laser pointer is pointed into sky at night, it has just got the brightest and the most visible green laser beam emitting. As a result, green laser pointer has just got great application as astronomy laser.
In current astronomy fields, low powered 5mW green laser pointer is just a very nice stargazer. When it is pointed into sky, astronomy lovers and amateurs can make clear pointing of star and constellation. Sometimes astronomy professionals also mount green laser pointer on telescope. The green laser pointer can project bright and visible green laser beam parallel with the tube of telescope. This application is always workable for long working distance astronomy stargazing.
Even though 5mW green laser pointer belongs to Class IIIa lasers, however, same safety cautions should be taken into consideration as same as high powered laser operation. Whenever users are making presentation with low powered laser, it should also not allowed to point into eyes, skins of human and animals. For the most important of all, laser pointers can never be pointed into airplane at night. De be cautious enough with laser radiation, and enjoy the great laser fun.