fig 1 (IMAGE) Compuscript Ltd Caption (a) Schematic of the PC-SRS microscope system for 3D chemical imaging. Inset drawings illustrate the ring-shaped pump beam and Gaussian Stokes beam on the SLM. (b) The distortion-corrected phase pattern for the SLM. (c-d) The phase patterns mimicking the ZPs for pump and Stokes beams, respectively. (e) The phase patterns used in experiments to control the axial positions of the Bessel pump and Gaussian Stokes beams in the sample. (f) The schematic of the generated shortened-length Bessel pump beam and Gaussian Stokes beam at different depths corresponding to the phase patterns in (e). (g) Raw SRS images of 10 μm PS beads acquired at different depths. Scale bar: 20 μm. Credit OEA Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.