Fig. 1. Pump laser beam shaping system

Fig. 2. Spatial resolution adjustable USEDCARS system

Fig. 3. Schematic diagram of USEDCARS longitudinal spatial resolution measurement

Fig. 4. Spatial distribution of CARS signals intensity under different resolution

Fig. 5. Spatial resolution with different annular pump laser beam radius

Fig. 6. CARS spectra with different spatial resolution conditions