Laser Diode Module
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What laser shows a better beam in sky?
Blue Violet one like this
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=270431132046&Category=53141&_trkparms=algo%3DLVI%26its%3DI%26otn%3D2
Or a green one like this
http://cgi.ebay.com/70mW-532nm-Green-High-Power-Laser-Diode-Module-Glass_W0QQitemZ280375161730QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4147a97382&_trksid=p3911.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1205%7C293%3A1%7C294%3A50
Which has better burning capabilities?
Unfortunately, no laser beam will be visible in the sky on the average night. During fog, or when winds have kicked up a lot of dust, or those few days when there is a huge amount of pollen in the air, then the beam will hit this stuff and be more or less visible. Light beams themselves, including lasers, are invisible until they hit something to reflect or scatter the light.
The number of mW determines the "burning capabilities" -- some materials will also react very differently to different wavelengths, but mostly it is the wattage in milliwatts (mW).
The lasers you see as pointers or cat toys or whatever are typically in the range of 0.5mW to 5 mW, with 1mW being the most common.
These lasers are over 100 times more powerful than that! That means a few things:
It is a federal crime to use it in any way that can result in the beam hitting any part of a human body, unless in a licensed medical application.
It must be mounted in an enclosure that cuts the power to the laser whenever the "door" is opened.
You can not buy or own one if you are under 18.
If you buy one, you are basically swearing that you are going to incorporate it into some equipment for some practical use.
Fines and jail time are applicable to breaking these laws.
This type of laser - either one - will INSTANTLY blind you if it goes in your eye directly, and will instantly injure you - up to and including blindness - if it reflects off of something and goes in your eye.
They can not be used in "constant on" mode - they will burn up. They must be used in short bursts or pulsed. (Again, they are designed to be part of some piece of industrial or medical equipment.)
In effect, they should be treated just the way you would treat a handgun.
You can do a google search on "laser laws" and get the whole story...
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