A real-time spectroscopic technique called time-wavelength optical sampling (TWOS) is investigated. TWOS combines the concepts of time-stretch spectroscopy (TSS) and ultrafast optical sampling to address some of the challenges facing the conventional TSS, such as its overreliance on detector speed and the inherent tradeoff between spectral resolution and signal-to-noise ratio. Using optical sampling by laser cavity tuning (OSCAT), a spectral resolution of 710 MHz has been achieved in the 1.5 µm wavelength range. A 15-dB improvement in low-power tolerance and a frame rate as high as 2 kHz for real-time measurement are also demonstrated. This work sets the benchmark performance for TWOS spectroscopy and thereby lays out a path towards practical applications of this new technique.

中文翻译：

---

具有 sub-GHz 分辨率和高灵敏度的实时 TWOS 光谱

研究了一种称为时间波长光学采样 (TWOS) 的实时光谱技术。TWOS 结合了时间拉伸光谱 (TSS) 和超快光学采样的概念，以解决传统 TSS 面临的一些挑战，例如过度依赖探测器速度以及光谱分辨率和信噪比之间的固有权衡。由激光腔调谐（OSCAT）使用光学采样，710 MHz的光谱分辨率已在1.5实现μ米的波长范围。还展示了 15-dB 的低功率容限改进和高达 2 kHz 的帧速率用于实时测量。这项工作为 TWOS 光谱设定了基准性能，从而为这项新技术的实际应用开辟了道路。