Flat top optical frequency combs based on a single-core quantum cascade laser at the wavelength of ~8.7 μm
| Autor: | 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 |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Chinese Physics Letters. |
| ISSN: | 1741-3540 0256-307X |
| DOI: | 10.1088/0256-307x/40/01/014201 |
| Popis: | 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 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. |
| Databáze: | OpenAIRE |
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