To provide an optical chopper which is made small in size, light in weight, high in operating speed, low in power consumption, and low in cost.
An input light beam is intermitted with an optical variable attenuator 1 by passing an exciting current through a magnetic field applying coil 2 which applies a magnetic field to the optical variable attenuator 1 with light attenuation varied corresponding to the applied magnetic filed via a constant current driving circuit 4. The constant current driving circuit 4 sets an exciting current passed from a driving voltage source 4A to a magnetic field applying means in the forward direction to a predetermined value and a current passed in the reverse direction to zero, corresponding to a chopping signal supplied from a chopping signal generating circuit 5.
IMAI KAZUHIRO
BAMBANG WIDIYATMOKO
KOYAIZU HIROTADA
Eiichi Tamura
Seiji Iga
Toshiya Fujii
Nobuhiro Noguchi
Shigeru Yamaguchi
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