Mode-hop-free wavelength-tunable semiconductor lasers covering the S+C+L band via external-cavity optical feedback

作者：Liwen Sheng, Zhiming Liu, Jianjun Wang, Lei Liu, Bingqi Yin, Zhihui Zhang, Shuai Zhou, Lin Huang · 发表于：Frontiers in Physics · 年份：2025 · DOI：10.3389/fphy.2025.1586316 · 被引用次数：5 · 研究领域：Semiconductor Lasers and Optical Devices、Photonic and Optical Devices、Optical Network Technologies

A wide mode-hop-free and narrow-linewidth tunable laser diode source employing a Littman-Metcalf configuration with a diffraction grating is developed. We conducted a series of experiments to evaluate the tuning characteristics and spectral linewidth of the proposed external-cavity diode laser. A continuous, mode-hop-free wavelength tuning range of approximately 180 nm within the S+C+L band is achieved, with a spectral linewidth below 32.95 kHz. Moreover, the device maintains an optical signal-to-noise ratio exceeding 62.60 dB and an output power above 10.11 dBm over the entire tuning range under long-term free-running conditions. This tunable laser, offering both mode-hop-free operation and narrow-linewidth output, holds significant promise for practical applications such as coherent detection.