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Flat Top Optical Frequency Combs Based on a Single-Core Quantum Cascade Laser at Wavelength of ∼ 8.7 μm

Authors :
Yu Ma
Wei-Jiang Li
Yun-Fei Xu
Jun-Qi Liu
Ning Zhuo
Ke Yang
Jin-Chuan Zhang
Shen-Qiang Zhai
Shu-Man Liu
Li-Jun Wang
Feng-Qi Liu
Source :
Chinese Physics Letters. 40:014201
Publication Year :
2023
Publisher :
IOP Publishing, 2023.

Abstract

We present optical frequency combs with a spectral emission of 48 cm−1 and an output power of 420 mW based on a single-core quantum cascade laser at λ ∼ 8.7 μm. A flat top spectrum sustains up to 130 comb modes delivering ∼ 3.2 mW of optical power per mode, making it a valuable tool for dual comb spectroscopy. The homogeneous gain medium, relying on a slightly diagonal bound-to-continuum structure, promises to provide a broad and stable gain for comb operating. Remarkably, the dispersion of this device is measured within 300 fs2/mm to ensure stable comb operation over 90% of the total current range. The comb is observed with a narrow beatnote linewidth around 2 kHz and has weak dependence on the applied current for stable comb operation.

Subjects

Subjects :
General Physics and Astronomy

Details

ISSN :
17413540 and 0256307X
Volume :
40
Database :
OpenAIRE
Journal :
Chinese Physics Letters
Accession number :
edsair.doi...........693e7ecd1179343c2e075b7be53db4ab
Full Text :
https://doi.org/10.1088/0256-307x/40/1/014201