Design Considerations for a Portable Raman Probe Spectrometer for Field Forensics

Figure 13

An example line formed epi-illuminator and line image transfer optic to match the target line illumination to a low distortion Offner-Dyson spectrograph (slit intensity shown in the inset). The 1st cylindrical achromat reshaping light from a 1D axicon (Powell lens) is oriented at 90 degrees with respect to the focusing objective (2nd) and transfer (3rd) cylindrical achromats. The line image was designed in this case to be 12 mm high. The illuminated/imaged sample is shown in the lower left of the figure.