Pulse Modulation of an Electron Injection Laser Transmission System

摘要

Amplitude modulation of gas lasers in CW operation are easily achievable in the audio frequency range either by modulation of the rf pump power or by electro-optical or piezoelectric modulators. In initial experiments a He-Ne gas laser (Spectra Physics Nr. 112) with hemispherical resonator arrangement emitting at 6328 was employed. Pump modulation allowed a modulation depth of the emitted coherent radiation of 100% with an average power output of three milliwatts. The light signal was collected in a 4 foot telescope (Questar) and received by an RCA 7265 photomultipler. This experimental system was used for the transmission of one audio channel.