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It is observed that the red, green and blue colored glass filters did not have any significant impact on the power of the laser beam. It is also observed that the red laser beam emitted the greatest amount of power and the blue beam, the least amount of power.

Glass filter color Power of the laser light through the glass filter (Watt)
  Red laser Green laser Blue laser
None 0.88 0.65 0.35
Red 0.88 0.64 0.34
Green 0.87 0.62 0.31
Blue 0.87 0.64 0.33
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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 hour for observation
Material availability:
Easily obtained from a hobby store
Safety concerns:

The colored glass will filter and block the beam of the laser pointer.