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What is the smallest HeNe laser that I can use to make simple laser transmission holograms with the PFG-01 emulsion?

April 26, 2017emulsion HeNe holograms laser pfg-01 simple smallest transmission

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What is the smallest HeNe laser that I can use to make simple laser transmission holograms with the PFG-01 emulsion?

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There is no smallest size. Even with 1mW you can make excellent holograms. All depends on the exposure time – less energy of your laser – longer exposure time.