Proceedings PaperDCG recording with red light: discovery of a new electron-donor system
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Bright and scatter-free reflection holograms of about 4 cm. diameter can now be made in DCG using a 10mw HeNe laser and a one minute exposure. This breakthrough in DCG technology comes from the discovery of a new electron donor compound (tetramethylguanidine) used in conjunction with methylene blue. Other dyes will allow much greater sensitivity to green light than normally exists in DCG. This can lead to both easier fabrication of HOE's and full color DCG holograms. Furthermore, the high alkalinity of the system allows the unexposed coated material to have an effective lifetime at room temperature of weeks rather than hours. It has a much lower quantity of hexavalent chromium than normal unexposed DCG, thus making its toxicity comparatively much lower.