Ultrafast broadband Fourier-transform CARS spectroscopy at 50,000 spectra/s enabled by a scanning Fourier-domain delay line

作者：Tamamitsu Miu; Sakaki Yusuke; Nakamura Tasuku; Podagatlapalli G Krishna; Ideguchi Takuro^*; Goda Keisuke

来源：Vibrational Spectroscopy, 2017, 91: 163-169.

DOI：10.1016/j.vibspec.2016.07.007

• Raman spectroscopy
• Coherent anti-Stokes Raman scattering
• Fourier-transform spectroscopy

We propose and demonstrate a coherent Raman scattering (CRS) spectroscopy technique capable of acquiring 50,000 broadband Raman spectra/s. This ultrafast spectral acquisition is realized by employing a Fourier-domain delay line based on a rapidly rotating polygonal mirror array as an optical path-length scanner in a broadband Fourier-transform coherent anti-Stokes Raman scattering (FT-CARS) spectroscopy platform. We provide a theoretical description of the proposed FT-CARS spectroscopy technique while also presenting its proof-of-concept demonstration on a liquid toluene sample. Our use of a 54-facet polygonal mirror array rotating at 916 rotation/s achieves a record high scan rate of 50,000 CARS spectra/s, covering most of the molecular fingerprint region (200-1430 cm(-1)) with a high resolution of 4.2 cm(-1). This ultrafast broadband CRS technique is expected to be of great use in applications where high-throughput screening or real-time monitoring of unknown samples with high specificity is required, such as single-cell analysis and biomedical imaging.

• 出版日期2017-7