The MiniCL is a simple but effective cathodoluminescense (CL) imaging system, which is interfaced to the Zeiss EVO 50 Variable Pressure SEM. The novel design utilizes a miniature, highly sensitive photomultiplier tube (PMT), which is mounted inside the SEM chamber at the end of a retractable probe. The detector can be positioned close to the sample, whilst under vacuum, allowing efficient collection of CL emission whether at low or high magnification. A simple 'push on' mirror is provided, which facilitates improved collection of light emitted close to the sample without restricting low magnification imaging or back scatter detection. The probe can be easily retracted to allow the use of other detectors or large sample movements.
The output from the MiniCL is connected to the SEM auxiliary input allowing the CL image to be displayed on the SEM monitor. A prime example for use of the detector is for studying zonation in minerals such as Zircon.