Position and mode dependent coupling of terahertz quantum cascade laser fields to an integrated diode

TL;DR

This paper investigates how the position and mode of a Schottky diode integrated into a terahertz quantum cascade laser affect the coupling of laser fields, revealing that diode placement significantly influences laser-diode interaction.

Contribution

It demonstrates the dependence of laser-diode coupling on diode position and laser mode in integrated terahertz quantum cascade lasers.

Findings

Diode response correlates with laser power and mode coupling strength.

Diode position significantly influences laser-diode coupling.

Coupling varies with different cavity locations.

Abstract

A Schottky diode integrated into a terahertz quantum cascade laser waveguide couples directly to the internal laser fields. In a multimode laser, the diode response is correlated with both the instantaneous power and the coupling strength to the diode of each lasing mode. Measurements of the rectified response of diodes integrated in two quantum cascade laser cavities at different locations indicate that the relative diode position strongly influences the laser-diode coupling.