Temperature and Intensity Dependent Faraday Rotation in Hg1-xMnxTe at CO2 Laser Wavelengths |
| L. Kowałczyk, R.R. Gałązka Institute of Physics' Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland |
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| Faraday rotation in Hg1-xMnxTe (x = 0.11) has been investigated experimentally over the temperature range from T = 8 K to 250 K using a Q-switched CO2 laser. Due to the exchange interaction between mobile carriers and localized Mn ions, dramatic enhancement of Verdet coefficient at low temperatures has been observed. The values of Verdet coefficient V = 5585 rad T-1 m-1 at 8 K and V = 1745 rad T-1 m-1 at 80 K have been obtained for Hg0.89Mn0.11Te at 10.6 μm. The dependence of Faraday rotation on intensity of laser radiation has been observed. Intensity dependent Faraday rotation shows saturation for high laser power. Intensity induced rotation is qualitatively attributed to the dispersion associated with saturable absorption of laser radiation. The results obtained in this work indicate that Hg1-xMnxTe is a suitable material for Faraday rotator at CO2 laser wavelengths for high power laser beam. |
| DOI: 10.12693/APhysPolA.80.429 PACS numbers: 78.20.Ls, 75.30.El |