光学
拉曼光谱
光子计数
光子
光谱学
拉曼散射
材料科学
重复(修辞手法)
相干反斯托克斯拉曼光谱
物理
语言学
量子力学
哲学
作者
N. Finlayson,Andrea Usai,Gillian E. Brown,Heather McEwan,Ahmet T. Erdogan,Colin J. Campbell,Robert Henderson
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2021-07-08
卷期号:46 (17): 4104-4104
被引量:7
摘要
Significant improvements in time-correlated single photon counting (TCSPC) Raman spectroscopy acquisition times can be achieved through exploitation of megahertz (MHz) laser repetition rates. We have developed a TCSPC Raman spectroscopy system based on a high peak power ( > 40 W ) pulsed laser, a high pulse repetition rate (40 MHz), a custom f / 1.5 spectrometer, and a 512 spectral channel × 16 time bin single photon avalanche diode line sensor. We report millisecond Raman spectrum acquisition times, a peak Raman count rate of 104 kcps, and a linewidth aggregated count rate of 440 kcps with a diamond sample. This represents a three-order-of-magnitude increase in measured Raman count rate in comparison with a 104 kHz pulsed laser operating at 300 W and a four-order-of-magnitude increase over a 0.1 W pulsed laser operating at 40 MHz. A Raman-to-fluorescence ratio of 4.76 is achieved with a sesame oil sample at a 20 MHz repetition rate. Achieving high count rates and Raman-to-fluorescence ratios unlocks the potential of combined Raman/fluorescence lifetime spectroscopy for imaging and other short acquisition time applications.
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