Y coupled terahertz quantum cascade lasers

TL;DR

This paper demonstrates a Y coupled terahertz quantum cascade laser system that exhibits enhanced power output and unique emission spectra when both arms are driven synchronously, showing potential for advanced THz laser applications.

Contribution

The study introduces a Y coupled THz QCL system with synchronized driving, revealing power enhancement and spectral differences compared to individual lasers.

Findings

Total peak power exceeds linear sum of individual arms.

Emission spectra differ significantly from individual lasers.

Synchronous driving enhances output and spectral properties.

Abstract

Here we demonstrate a Y coupled terahertz (THz) quantum cascade laser (QCL) system. The two THz QCLs working around 2.85 THz are driven by independent electrical pulsers. Total peak THz output power of the Y system, with both arms being driven synchronously, is found to be more than the linear sum of the peak powers from the individual arms; 10.4 mW compared with 9.6 mW (4.7 mW + 4.9 mW). Furthermore, we demonstrate that the emission spectra of this coupled system are significantly different to that of either arm alone, or to the linear combination of their individual spectra.