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

1)利用Lameller型反射器实现单波长线振荡采用由Lameller型干涉反射器和凹面镜组成的光学谐振器实现单波长线振荡。2)利用电容式网状镜实现单波线振荡在硅单晶衬底上制备的电容式网状镜和凹面镜的组合也实现了单波线振荡。3)采用外差检测的高分辨率光谱测量方法利用频谱分析仪在脉冲模式下工作，实时和波长分辨率分别为0.1秒和1MH_z，检测同步振荡线的自拍信号。测量结果表明，单个振荡线的线宽非常窄，约为4MH_z。4)改进了Voight构型的振荡特性在Voight构型中，垂直于光谐振腔的轴线施加磁场，实现了激光振荡。这种结构的选择导致了性能的显著改善，例如振荡波长范围的发展，长波振荡强度的增加，以及振荡的电场和磁场范围的扩大。

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.