Sensitive measurement of the magneto-optic effect in the near infrared wavelength region with weak alternating magnetic fields

초록

In this paper, we present a sensitive measurement method of the Verdet constant of magneto-optic materials with an auto-balanced photodetector and a lock-in amplifier under weak alternating magnetic fields in the near infrared wavelength region. We describe the theories and formulas for the measurement method by accounting for the characteristics of the auto-balanced photoreceiver and lock-in amplifier. The measurement method was verified by measuring the Verdet constant of the well-known BK7 samples at 1,310 and 1,550 nm wavelengths. This method was used to measure the Verdet constant of the regioregular poly(3-hexylthiophene-2,5-diyl) thiophenes (P3HT) materials prepared at various baking and cooling conditions for the wavelengths of 1310 and 1550 nm. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

키워드