相干反斯托克斯拉曼散射(CARS)光谱技术可检测物质的分子组成和结构特征，具有信号强、灵敏度高、抗荧光干扰等优点，在材料检测、生物成像等领域具有重要应用价值。普通CARS测量需要多光束共同作用，且需波长扫描以获取完整的分子振动谱，限制了该技术的应用。本项目提出一种基于超连续白光的单光束CARS光谱技术，利用飞秒超连续白光作为激光光源，通过陷波调制产生具有窄带光谱特征的激发光脉冲，可同时完成分子多个振动模式的CARS测量，并具有光谱分辨率高、动态范围大、信噪比高的优点。项目拟研究基于光谱陷波调制的单光束CARS测量技术，实现光谱分辨率高的单光束CARS测量；利用飞秒激光在介质中诱导产生均匀稳定的超连续白光光源，扩展单光束CARS的动态测量范围；研制基于超连续白光的单光束宽带CARS测量系统，光谱分辨率优于50波数，测量动态范围高于3000波数。探索该技术在生物显微成像与燃烧场检测中的应用。

Coherent anti-Stokes Raman scattering (CARS) spectroscopy can be employed to study molecular components and structures of materials. Because of its great advantages of high sensitivity against fluorescence background and high collection efficiency, it can be employed in studying material properties, optical bio-imaging, and et al. The applications of conventional CARS technique are greatly restricted as multi-beam is involved and wavelength scanning is needed to acquire the full vibrational spectrum. In this project, we propose a single-beam CARS spectroscopy based on femtosecond laser induced white-light supercontinuum. By modulating the excitation pulse with spectral notch filter, multi vibrational spectra of molecule can be achieved at the same time. This single-beam CARS shows great advantages with high spectral resolution, large dynamic spectral range and high signal-to-noise ratio. The study of the project includes:.(1) Investigating the key techniques in single-beam CARS measurements based on spectral notch filtered pulses, and realizing single-beam CARS detection with high spectral resolution. .(2) Enlarging the dynamic spectral range of the proposed single-beam CARS measurements, by developing supercontinuum white-light source induced by femtosecond laser pulses. .(3) The final goal of the project is to set up the single-beam broadband CARS spectrograph based on femtosecond white-light supercontinuum, and explore its application in bio-imaging and combustion flow imaging. The system is characterized by a spectral resolution less than 50 cm-1 and dynamic range higher than 3000 cm-1.