Thermoelectrically cooled THz quantum cascade laser operating up to 210 K

TL;DR

This paper reports a terahertz quantum cascade laser that operates up to 210.5 K using thermoelectric cooling, achieved through optimized quantum well design and non-cryogenic measurement techniques.

Contribution

The study introduces a simplified active region design with only two quantum wells and demonstrates high-temperature operation with cryogenic-free measurement.

Findings

Operates up to 210.5 K with thermoelectric cooling

Maximum output power of 200 mW at 40 K

Cryogenic-free measurement setup

Abstract

We present a \MF{terahertz} quantum cascade laser operating on a thermoelectric cooler up to a record-high temperature of 210.5 K. The active region design is based on only two quantum wells and achieves high temperature operation thanks to a systematic optimization by means of a nonequilibrium Green's function model. Laser spectra were measured with a room temperature detector, making the whole setup cryogenic free. At low temperatures ($\sim 40 K), a maximum output power of 200 mW was measured.