We report preliminary results of a systematic research of far-infrared (FIR) emissions in (15)NH(3) by Stark-tuning the infrared-pumped transitions to the CO(2) or N(2)O laser lines; 28 new FIR lasing lines have been detected for static-electric fields up to 62 kV/cm.
The construction of metallic wired grids used as semitransparent mirrors is described. The reflectance of such grids varies widely with the polarization direction of the beam. The measured characteristics are compared with those calculated. These grids are used in the cavity of an HCN laser and determine the polarization direction of the output beam.
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