Lee Young Jong, Liu Yuexin, Cicerone Marcus T
Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Opt Lett. 2007 Nov 15;32(22):3370-2. doi: 10.1364/ol.32.003370.
We demonstrate that a broadband coherent anti-Stokes Raman scattering (CARS) spectrum generated with a typical two-pulse scheme contains two distinct, significant signals: '2-color' CARS, where the pump and probe are provided by a narrowband pulse and the continuum pulse constitutes the Stokes light, and '3-color' CARS, where the pump and Stokes are provided by two different frequency components in the continuum pulse and the narrowband pulse serves as the probe. The CARS spectra from the two different mechanisms show distinct characteristics in Raman shift range, laser power dependence, and chirping dependence. We discuss the potential for a 3-color CARS signal to cover the fingerprint region with reduced photodamage of live cells. Official contribution of the National Institute of Standards and Technology; not subject to copyright in the United States.
我们证明，用典型的双脉冲方案产生的宽带相干反斯托克斯拉曼散射（CARS）光谱包含两个不同的重要信号：“双色”CARS，其中泵浦光和探测光由窄带脉冲提供，而连续谱脉冲构成斯托克斯光；以及“三色”CARS，其中泵浦光和斯托克斯光由连续谱脉冲中的两个不同频率成分提供，窄带脉冲用作探测光。来自这两种不同机制的CARS光谱在拉曼位移范围、激光功率依赖性和啁啾依赖性方面表现出不同的特征。我们讨论了三色CARS信号在减少活细胞光损伤的情况下覆盖指纹区域的潜力。美国国家标准与技术研究院的官方贡献；在美国不受版权保护。
