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Published on: May 28, 2021
A confocal optical microscope for detection of single impurities in a bulk crystal at cryogenic temperatures
Jenny Karlsson1, Lars Rippe1, Stefan Kröll1
1Department of Physics, Lund University, P.O. Box 118, SE-22100 Lund, Sweden.
Abstract:
A compact sample-scanning confocal optical microscope for detection of single impurities below the surface of a bulk crystal at cryogenic temperatures is described. The sample, lens, and scanners are mounted inside a helium bath cryostat and have a footprint of only 19 × 19 mm. Wide field imaging and confocal imaging using a Blu-ray lens immersed in liquid helium are demonstrated with excitation at 370 nm. A spatial resolution of 300 nm and a detection efficiency of 1.6% were achieved.

