A confocal optical microscope for detection of single impurities in a bulk crystal at cryogenic temperatures

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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.

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  • Atom and Molecular Physics and Optics
Original languageEnglish
Article number033701
JournalReview of Scientific Instruments
Volume87
Issue number3
Publication statusPublished - 2016 Mar 1
Publication categoryResearch
Peer-reviewedYes