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Capability of shifted excitation Raman difference spectroscopy under ambient daylight

机译:日光下位移激发拉曼差光谱的能力

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We present the capability of shifted excitation Raman difference spectroscopy (SERDS) under ambient daylight. A dual-wavelength diode laser emitting at 785 nm is used as the excitation light source. The monolithic diode laser provides more than 110 mW in cw operation. Both excitation lines show an emission width <= 0.2 cm(-1) and a spectral distance of 10 cm(-1) as targeted for SERDS. Polystyrene (PS) is used as the test sample and ambient daylight to generate real-world background interference. Here, a broadband background signal with narrowband absorption lines from water vapor and Fraunhofer lines from singly ionized calcium (Ca II) obscure the Raman lines of PS. SERDS clearly separates the Raman signals from the background signals with a 13-fold improvement in signal-to-background noise. (C) 2015 Optical Society of America
机译:我们介绍了在环境日光下的移动激发拉曼差光谱(SERDS)的功能。使用在785 nm处发射的双波长二极管激光器作为激发光源。单片二极管激光器的连续工作功率超过110 mW。两条激发线均显示出SERDS的目标发射宽度<= 0.2 cm(-1)和10 cm(-1)的光谱距离。聚苯乙烯(PS)用作测试样品和环境日光以产生实际背景干扰。在这里,宽带背景信号带有来自水蒸气的窄带吸收谱线和来自单离子钙(Ca II)的Fraunhofer谱线,遮盖了PS的拉曼谱线。 SERDS可以将拉曼信号与背景信号清楚地分开,从而使信噪比提高13倍。 (C)2015年美国眼镜学会

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