Work

Mid-infrared quantum cascade laser frequency combs based on multi-section waveguides

Year: 2020

Type: article

Abstract: We present quantum cascade laser (QCL) frequency comb devices with engineered waveguides for managing the dispersion. The QCL waveguide consists of multiple sections with different waveguide widths. The narrow and wide sections of the waveguide are designed in a way to compensate the group velocity dispersion (GVD) of each other and thereby produce a flat and slightly negative GVD for the QCL. The QCL exhibits continuous comb operation over a large part of the dynamic range of the laser. Strong and narrow-linewidth intermode beatnotes are achieved in a more than 300 mA wide operation current range. The comb device also features considerably high output power ( > 380 m W ) and wide optical bandwidth ( > 55 c m − 1 ).

Source: Optics Letters

DOI: 10.1364/ol.411027

Authors: Ruijun Wang, Philipp Täschler, Filippos Kapsalidis, Mehran Shahmohammadi, Mattias Beck, Jérôme Faist

Institutions: ETH Zurich, Institute for Quantum Electronics

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: green

Funder: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

Award: High-resolution QCL frequency comb spectrometer for the detection of trace gases and their isotopes