Operational characteristics of a light amplifier

Abstract
A general operation diagram of a traveling unidirectional light amplifier is proposed by theoretical analysis, wherein different regimes are specified by a noise condition and the several threshold conditions of gain. The effects of hole burning and cross relaxation on the amplified spontaneous‐emission (AES) noise and the gain saturation threshold were formulated. The transient operation diagram was determined by a numerical calculation of the rate equations in dye‐laser amplifier with a rhodamine 6G methanol solution system. The numerically calculated diagram agreed well with the general analytical results.