Deng Lihua, Yang Zheng, Yan Baiyi, Jiang Nan, Zhang Jiale, Liang Wei
Opt Express. 2025 Jun 16;33(12):25436-25446. doi: 10.1364/OE.566424.
We demonstrate a 1550 nm external-cavity diode laser (ECDL) based on a high-Q miniaturized Fabry-Pérot (FP) cavity, achieving a wide mode-hop-free continuous frequency-tuning range, which holds significant application value in fields such as frequency-modulated continuous-wave (FMCW) ranging and radar. By minimizing the feedback loop length and employing a piezoelectric transducer (PZT) to scan the cavity length, the continuous frequency-tuning range exceeds 30 GHz at a repetition rate of 100 Hz, with frequency-tuning nonlinearities of 1.7% and 1.9% for the up-scan and down-scan phases, respectively. When the scanning frequency is increased to 10 kHz, the continuous frequency-tuning range remains above 10 GHz. The 3 dB linewidth is narrowed to 10 kHz, while the laser volume is only 3 mL. Through synchronous adjustment of both the feedback loop and FP cavity phases, the continuous frequency-tuning range can be expanded to 50 GHz, with a corresponding frequency-tuning nonlinearity of 2.0%. By increasing the Q-factor of the FP cavity (>10), the linewidth is further narrowed to 2.8 kHz, and the high-Q FP cavity demonstrates significant suppression of frequency noise.
我们展示了一种基于高Q值小型法布里-珀罗（FP）腔的1550 nm外腔二极管激光器（ECDL），实现了宽的无模式跳变连续频率调谐范围，这在调频连续波（FMCW）测距和雷达等领域具有重要的应用价值。通过最小化反馈回路长度并采用压电换能器（PZT）扫描腔长，在100 Hz的重复频率下连续频率调谐范围超过30 GHz，上扫描和下扫描阶段的频率调谐非线性分别为1.7%和1.9%。当扫描频率增加到10 kHz时，连续频率调谐范围保持在10 GHz以上。3 dB线宽缩小到10 kHz，而激光器体积仅为3 mL。通过同步调整反馈回路和FP腔的相位，连续频率调谐范围可扩展到50 GHz，相应的频率调谐非线性为2.0%。通过提高FP腔的品质因数（>10），线宽进一步缩小到2.8 kHz，高Q值FP腔显著抑制了频率噪声。
