1. Editorial

   • Kenneth J. Button

   EditorialNotes Pages: 1 - 2

2. Low Pass metallic mesh interference filters for operation in the 165 GHz to 880 GHz region

   • B. W. Davis
   • R. Miller

   OriginalPaper Pages: 3 - 11

3. Axisymmetric optical system for quasi-optical gyrotron

   • Y. Itoh
   • T. Sugawara

   OriginalPaper Pages: 13 - 23

4. A simulation of the thermal behaviour of the UK-NL millimeter wave telescope

   • J. D. Bregman
   • J. L. Casse

   OriginalPaper Pages: 25 - 40

5. Doppler-shift dominated cyclotron maser amplifiers

   • A. T. Lin
   • Chih-Chien Lin

   OriginalPaper Pages: 41 - 51

6. A far infrared scanning plane Fabry-Perot spectro interferometer

   • H. Blancher
   • G. Bachet
   • D. Aubert

   OriginalPaper Pages: 53 - 62

7. Optical pumping by CO₂ and N₂O lasers: New cw FIR emissions in vinyl cyanide

   • C. Gastaud
   • M. Redon
   • M. Fourrier

   OriginalPaper Pages: 63 - 70

8. Si-monolithic integrated pyroelectric infrared sensor made of PbTiO₃ thin films

   • Masanori Okuyama
   • Kohzo Ohtani
   • Yoshihiro Hamakawa

   OriginalPaper Pages: 71 - 78