An effect of a pump pulse rising edge on the QCL build-up time: the analytical approach

TL;DR

This paper presents an analytical model for quantum cascade laser build-up time, considering overheating and photon filling effects, explaining diverse experimental behaviors across different power regimes.

Contribution

It introduces a simplified analytical approach that accurately accounts for key effects influencing QCL build-up time, enhancing understanding of experimental observations.

Findings

Build-up time behavior varies with power levels.

Overheating and photon filling significantly affect build-up dynamics.

Model explains non-monotonous and decreasing curvature behaviors.

Abstract

In this work, we provide a simplified theoretical analytical estimation of the quantum cascade laser build-up time, accurately taking into account the main effects: the QCL overheating during the pump pulse and the photon mode filling effect. The non-trivial interplay of the mentioned effects brings about a variety of possible experimental build-up time behaviors. The latter range from decreasing curvature for low-power devices to non-monotonous function for devices performing at high power.