We demonstrate a wavelength tunable optical excitation source for coherent Raman scattering (CRS) spectroscopy based on a single femtosecond fiber laser. Electrically controlled wavelength tuning of Stokes optical pulses was achieved with soliton self frequency shift in an optical fiber, and linear frequency chirping was applied to both the pump and the Stokes waves to significantly improve the spectral resolution. The coherent anti-Stokes Raman scattering (CARS) spectrum of cyclohexane was measured and vibrational resonant Raman peaks separated by 70 cm−1 were clearly resolved. Single laser-based tunable excitation may greatly simplify CRS measurements and extend the practicality of CRS microscopy.
展开▼
机译：我们演示了基于单飞秒光纤激光器的相干拉曼散射（CRS）光谱学的波长可调光激发源。斯托克斯光脉冲的电控波长调谐是通过光纤中的孤子自频移实现的，并且线性频率线性调频应用于泵浦和斯托克斯波，以显着提高光谱分辨率。测量了环己烷的相干抗斯托克斯拉曼散射（CARS）光谱，清楚地分辨了由70 cm -1 隔开的振动共振拉曼峰。基于单个激光的可调激发可以大大简化CRS测量并扩展CRS显微镜的实用性。
展开▼
