Chopper
A low-frequency optical chopper offers modulation frequencies from dc to 12 Hz. The CH-50 offers an aperture of 0.25 ¥ 0.45 in. The jitter-free operation offers stability to 0.005%. The compact modulator can accept external clock input and can be stopped in the on or off position.
Electro-Optical Products Corp.,
Fresh Meadows, NY