Digital Control of Duty Factor for Optically-Chopped Beams

An optical chopper blade generally modulates a beam with 50% duty factor. It is possible to achieve <50% duty factor by stacking two identical blades, or by using specialty blades, which exist in both fixed and variable duty factor designs. In all of these cases, duty factor adjustments require stopping the chopper. The most flexible way to vary the duty factor is to synchronize two SR542 Precision Optical Choppers. This allows digital tuning of the duty factor continuously from 0% to 50% without stopping your experiment, and opens the door to remote, automated tests.


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