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HeNe produced red (primarily), yellow, and green (to lesser extents).but the
Usually, the end mirror filters out all but the red. The expense of the
greenies is the mirror (dielectric depositing, etc.) to filter out all
green. Same with yellow. They must also start out with more power, since
most of the energy goes into producing the red.<P>Dean Baird, Rio Americano HS, Sacramento