In a microscope of a micro-Raman spectrometer a cylindrical lens is introduced to form a line-focus microprobe (LFMP). The dimensions of the LFMP are 0.66 × 167 µm. The lateral spatial resolution of Raman scattering with the LFMP is equal to the spatial resolution of the point-focus microprobe (PFMP). It is shown that the LFMP system enables measurements with a laser power density that is 320 times lower than the PFMP. For the same laser power density in both types of illumination, the LFMP Raman spectra give approximately √320 or ≍ 18 times better signal-to-noise ratio.
© 1992 Optical Society of America
M. Ivanda and K. Furić, "Line focusing in micro-Raman spectroscopy," Appl. Opt. 31, 6371-6375 (1992)