Device for modulating intensity of light rays generated from gas laser
OwnerMasahiko Kato, Asao Hayashi +1inventors
InventorsMasahiko Kato, Asao Hayashi, Takeomi Suzuki
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Abstract
A device for modulating the intensity of light rays generated from a gas laser in which an input modulating signal is supplied to a switching element included in a modulating current supply source connected across a gas laser discharge tube to control the discharge current and hence modulate the laser light output. The gas laser discharge tube is eventually subjected to the influence of a magnetic field so as to stabilize the laser light output and modulating characteristic.
Claims10
A device for rapidly modulating at frequencies up to 200 KH.sub.z the intensity of light rays generated by a gas laser for picture image transmission, said device comprising an He-Ne gas laser discharge tube connected across the secondary side of a transformer, the pressure of gas sealed being of the order of 3 to 4.3 torr, and a modulating current supply source connected across said gas laser discharge tube and controlled by an input modulating signal such that the discharge current changes within a range from a current value at which the laser light output becomes maximum to a current value which is larger than said current value, said current source including a direct current supply source connected across said gas laser discharge tube for supplying discharge current to said gas laser discharge tube, resistors connected in series with said direct current supply source, and a switching transistor connected in parallel with one of said resistors, whereby said switching transistor is controlled by said input modulating signal so as to control the discharge current, thereby modulating the intensity of output light generated from said gas laser.
Dependencies are inferred from the claim text.