Originally Posted by
Greg
Was beam torquer an offset to the colormod signal? Or was it a separate optical device?
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Beam torquer, color mod I & II we're all summed together and drove the color mod galvo. In the Concert series projectors the raw beam was dispersed by a prism, then made parallel by a second prism, then through a lens to focus the beams on the beam torquer mirror, then through a second lens to re-collimate the beams. This eliminated the need for color mod correction - which didn't really work well on the original Mark 6. I think the problem was the difference in the mass of the color mod mirror vs the scanner mirrors caused a significant difference in the galvos resonance frequencies and the PDM scan amps - amplified the problem. Obviously focusing all of the beam at a point on the color mod mirror requires a good coating. On the other hand you could use a much smaller mirror in theory, and or a faster scanner...
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