I guess they are all variations on the same theme. i.e. bringing the voltage variation into the best range of the A/D and ultimately the bit buckets you have available to fill.
Possible problems with a laser I guess would be finding one with a sufficiently broad spectrum, or calibrating it, or maybe not if you carefully calibrated it to match the emulsions, etc. But with the later you would be digitally simulating the color cross talk engineered into the emulsion. So maybe you be better off with just a digital camera...
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