Pol_Conv_Video_OptExpress_V2.mp4 (543.37 kB)

Polarisation Conversion at Cryogenic Temperatures

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posted on 15.09.2020 by Frederik Thiele
This video shows the response of an electro-optic polarisation converter as a function of operating temperature, when cooled from 300K to 0.8K over a duration of 16h. Linearly polarised light is sent through the sample and changes in the intensity of the ordinary and extra-ordinary polarised beams are monitored, dependent on an applied voltage. During the cool down, the wavelength and modulation voltage is continuously swept, around the (temperature dependent) phase-matched wavelength and +/- 27V, respectively. The operation wavelength shifts to longer wavelengths because of the temperature dependent refractive index of the material.