It is possible to get laser diodes that only radiate in the IR part of the
spectrum. I don't know where or how much though.


Andrew

      |
      |         "For God so loved the  world that
  ----+----      he  gave his only son,  that who
      |          so ever believes in him will not
      |          perish but have eternal life"
      |                                 John 3:16
      |
      |