Relative intensity noise of a continuous-wave interband cascade laser at room temperature.

Abstract

This Letter investigates the relative intensity noise (RIN) characteristics of a continuous-wave 3.4μm interband cascade laser operated at room temperature. The RIN decreases with an increasing pump current and reaches down to -130 dB/Hz at a frequency of 450MHz. In addition, it is proved that the current noise of the laser pump source dominates the RIN for frequencies below 100MHz. The measured RIN is quantitatively in agreement with the theoretical analysis, from which the gain coefficient and the transparent carrier number of the laser are extracted.