Chen Hongzhou, Duan Zhenyu, Guan Chunying, Li Xixin, Gao Shan, Hu Xiao, Ye Peng, Yang Jing, Li Ping, Shi Jinhui, Yuan Libo
Opt Lett. 2023 Sep 1;48(17):4574-4577. doi: 10.1364/OL.497037.
This Letter proposes a method that balances miniaturization and high performance of fiber optic speckle spectrometers. The periodically tapered coreless fiber is used as the scattering element to excite more higher-order modes in the coreless fiber. As a result, a remarkable spectral resolution of 0.03 nm in the near-infrared spectrum can be achieved with a 5-cm-long fiber. Narrow linewidth and broadband spectra in the wavelength of 1540-1560 nm are reconstructed separately, demonstrating the excellent performance of the designed all-fiber spectrometer. The spectral resolution of our proposed spectrometer is comparable to that of a 2-m multimode fiber spectrometer and has a significant improvement in miniaturization.
本文提出了一种平衡光纤散斑光谱仪小型化与高性能的方法。周期性锥形无芯光纤用作散射元件，以激发无芯光纤中更多的高阶模。结果，使用5厘米长的光纤在近红外光谱中可实现0.03 nm的出色光谱分辨率。分别重建了1540 - 1560 nm波长范围内的窄线宽和宽带光谱，证明了所设计的全光纤光谱仪的优异性能。我们提出的光谱仪的光谱分辨率与2米多模光纤光谱仪相当，并且在小型化方面有显著改进。
