Author:
Ma Yu,Li Wei-Jiang,Xu Yun-Fei,Liu Jun-Qi,Zhuo Ning,Yang Ke,Zhang Jin-Chuan,Zhai Shen-Qiang,Liu Shu-Man,Wang Li-Jun,Liu Feng-Qi
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.
Subject
General Physics and Astronomy
Cited by
5 articles.
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