Abstract
We show how a differential interference contrast microscope can be adapted for low temperature operation by having only the microscope objective at low temperatures. The microscope’s body, with delicate birefringent optics, is kept at room temperature. A key part is the use of two Wollaston prisms with opposite anisotropic media to ensure a flat field. The device can detect optical path differences of the order of 10 pm/μm with a few seconds of integration time. Images taken at several hour intervals can be subtracted, indicating good mechanical stability.
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