Beier Hope T, Noojin Gary D, Rockwell Benjamin A
U. S. Air Force Research Laboratory, 4141 Petroleum Drive, Fort Sam Houston, TX 78234, USA.
Opt Express. 2011 Sep 26;19(20):18885-92. doi: 10.1364/OE.19.018885.
Stimulated Raman scattering (SRS) is a powerful tool for obtaining background-free chemical information about a material without extrinsic labeling. Background-free spectra are particularly important in the fingerprint region (~800 and 1800 cm(-1)) where peaks are narrow, closely-spaced, and may be in abundance for a particular chemical. We demonstrate a method for obtaining SRS spectra using a single femtosecond laser oscillator. A photonic crystal fiber is used to create a supercontinuum to provide a range of Stokes shifts from ~300 to 3400 cm(-1). This SRS approach provides for collection capabilities that are easily modified between obtaining broadband spectra and single-frequency images.
受激拉曼散射（SRS）是一种强大的工具，可在无需外部标记的情况下获取有关材料的无背景化学信息。无背景光谱在指纹区域（约800和1800 cm⁻¹）尤为重要，该区域的峰狭窄、间距紧密，且特定化学物质的峰可能很多。我们展示了一种使用单个飞秒激光振荡器获取SRS光谱的方法。采用光子晶体光纤产生超连续谱，以提供约300至3400 cm⁻¹的一系列斯托克斯频移。这种SRS方法具备采集能力，可在获取宽带光谱和单频图像之间轻松切换。
