Fabrications of a Germanium Laser Tunable in a Far-Infrared Range from 70 to 300mum.

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1) Single-Wavelength-line oscillation using a Lameller type reflectorSingle line oscillation was achieved by an optical resonator consisting of a Lameller type interference reflector and a concave mirror.2) Single-wavelenth-line oscillation using a capacitive mesh mirrorSingle line oscillation was achieved also by a combination of a capacitive mesh mirror faricated on a silicone-single-crystal substrate and a concave mirror.3) High-resolution spectrum measurement by a heterodyne detectionSelf-beat signal of simultaneous oscillating lines was detected with real-time- and wavelength-resolutions of 0.1 sec and 1MH_z, respectively, by operating a spectrum analyzer in a pulsed mode. The measurements revealed that line width of individual oscillation lines is extremely narrow, being around 4MH_z.4) Improved Characteristics of Oscillation in Voight ConfigurationLaser oscillation was achieved in Voight configuration, in which magnetic field is applied perpendicular to the axis of the optical resonator. This choice of configuration has led to significant improvements of the performance, such as a development of oscillation wavelength range, an increase in the intensity of long-wavelength oscillations, and an expansion of electric- and magnetic-field ranges for oscillation.