Steady-state characteristics of a GaAs injection quantum amplifier receiving a narrow-band input signal
An investigation was made of the amplifying characteristics of a stripe homojunction laser in which positive feedback was suppressed by orienting the axis of the active region at an angle to the cleaved end faces. Radiation from a conventional cw stripe homojunction laser emitting a single mode was used as the input signal. An analysis was made of the output power and spectral characteristics of the amplifier as a function of the rate of pumping of the amplifier and of the amplitude of the input signal. It was found that the gain exceeded 103 in the linear amplification regime and that the superradiant background was almost completely suppressed when the amplification process was saturated by a sufficiently strong input signal. An optical filter with a pass band 0.1 nm wide was placed at the amplifier exit and in this configuration the amplifier sensitivity was 0.4×10−7W.