Fast Swept-Wavelength, Low Threshold-Current, Continuous-Wave External Cavity Quantum Cascade Laser

We present a low threshold-current and fast wavelength-tuning external cavity quantum cascade laser (EC-QCL) using a scanning galvanometer in the Littman-Metcalf cavity geometry. The EC-QCL could repeatedly swept at 100 Hz over its full tuning range of about 290 nm (2105 cm(−1) to 2240 cm(−1)), prov...

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Detalles Bibliográficos
Autores principales: Jia, Xuefeng, Wang, Lijun, Jia, Zhiwei, Zhuo, Ning, Zhang, Jinchuan, Zhai, Shenqiang, Liu, Junqi, Liu, Shuman, Liu, Fengqi, Wang, Zhanguo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2018
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6203702/
https://www.ncbi.nlm.nih.gov/pubmed/30367319
http://dx.doi.org/10.1186/s11671-018-2765-1
Descripción
Sumario:We present a low threshold-current and fast wavelength-tuning external cavity quantum cascade laser (EC-QCL) using a scanning galvanometer in the Littman-Metcalf cavity geometry. The EC-QCL could repeatedly swept at 100 Hz over its full tuning range of about 290 nm (2105 cm(−1) to 2240 cm(−1)), providing a scan rate of 59.3 μm s(−1). The continuous-wave (CW) threshold current of the EC-QCL was as low as 250 mA and the maximum output power was 20.8 mW at 400 mA for a 3-mm-long QCL gain chip. With a sawtooth wave modulation, a scan resolution of < 0.2 cm(−1) can be achieved within the tuning range. The low power-consumption and fast swept-wavelength EC-QCL will be beneficial to many applications.

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