Abstract: A side entry TEM holder incorporates a miniature tilted off axis elliptical mirror to collect cathodoluminescence from the specimen and couple it efficiently into a tilted fiber optic integrated into the holder. The design is compatible with the cryogenic operation of the holder. TEM specimens are partially transparent to the electron beam, and so light can be emitted above and below the specimen. The same principle of off-axis mirror and tilted fiber can be utilized to collect light from above and below the specimen yet fit into the very confined space required by insertion through the goniometer and for operation between narrow gap pole pieces. With a dual system, the emission of light from above the specimen can be compared to that from below thereby enhancing the versatility of the analytical technique.