Polarization of the far-infrared laser oscillation in p-Ge in Faraday configuration

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Abstract
Polarization of far‐infrared laser oscillation in p‐Ge under crossed electric and magnetic fields is studied by use of a linear polarizer. The laser emission is found to be polarized with the primary axis nearly parallel to the current vector in the Ge laser rod, independent of the strength of electric and magnetic fields and the oscillation wavelength. An analysis of the resonance condition of an optical resonant cavity placed in Faraday configuration together with the experimental results make it probable that net Faraday rotation vanishes in the laser oscillation. To support this it is pointed out that both the free‐carrier Faraday effect and the intervalence band Faraday effect are strongly affected by the strong radiations caused by laser oscillation. The relation of the anisotropy of carrier distribution in velocity space to the observed polarization is also discussed.