The OCP71 Phototransistor. Chapter eleven of the 1960 Mullard reference manual of transistor circuits.
Light Modulation. The utter basics - at least one stage of electronics.
Light-Beam Transmitter-Receiver. Designed for speech and music.
Speech-on-Light. A simple but effective system.
Modulated-Light Transmitter and Receiver. Another successful system.
Modulated-Light Broadcast Transmitter. A range of 150 yards with light bulbs.
Communication by Modulated Arc Beam. Transmit frequency to 10 kHz and a quarter of a mile range in daylight.
David Bowman's Site Great site with technical details
Sam's Laser Site Lots of useful facts
K3PGP Experimenter's.Corner Another Good American site
Laser Communications From Jim Moss, N9JIM/6
N6IZW/W6VR Laser QSO Details of Saturday, June 24, 2000
Experiments in Finland Informative site