p-type Ge far-infrared laser oscillation in Voigt configuration

Abstract

Far-infrared laser oscillation is studied in p-Ge subjected to crossed electric and magnetic fields. Compared with the oscillation in the Faraday configuration, the region of radiation in the optical resonator is propagated perpendicularly to the external magnetic field. Compared to the oscillation in the Faraday configuration, the region of the electric (E) and magnetic (B) fields for oscillation is expanded significantly. Also, longer-wavelength oscillation ( lambda >150 mu m), which is missing in the Faraday configuration, coexists with shorter-wavelength oscillation ( lambda <120 mu m) in the whole region of E and B fields. The laser emission is suggested to be of linear polarization, where the plane polarization is aligned either parallel or normal to the external B-field, depending on E- and B-fields and the oscillation wavelength.