Optical Choppers
New Focus
Chopping is phase-locked Versatile-chop at frequencies from 4 Hz to 6.4kHz Lock to external references for harmonic or sub-harmonic chopping.
The Model 3501 optical chopper provides rock-solid stability and flexibility because its chopping frequency is phase-locked to its own internal frequency synthesiser. It comes complete with four wheels, a wheel cover and a GPIB (IEEE-488) interface.
Italy Fotonica 
