Details

Autor(en) / Beteiligte

• 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

Titel

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

Ist Teil von

• Chinese physics letters, 2023-01, Vol.40 (1), p.14201-33

Ort / Verlag

Chinese Physical Society and IOP Publishing Ltd

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 fs 2 /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.