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Flat Top Optical Frequency Combs Based on a Single-Core Quantum Cascade Laser at Wavelength of ∼ 8.7 μm
- 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 :
- General Physics and Astronomy
Subjects
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