Title :
Gaussian-beam open resonator with highly reflective circular coupling regions
Author :
Matsui, Toshiaki ; Araki, Ken´ichi ; Kiyokawa, Masahiro
Author_Institution :
Commun. Res. Lab., Minist. of Posts & Telecommun., Tokyo, Japan
fDate :
10/1/1993 12:00:00 AM
Abstract :
A high-Q open resonator with quasi-optical coupling regions is described. The resonator consists of a pair of spherical mirrors, on each of which a highly reflective, partially transparent circular region is fabricated with a diameter larger than several wavelengths. The signal is coupled in and out as a Gaussian beam by means of these regions. Both very weak coupling and very efficient mode conversion are simultaneously achieved. This results in a Q-factor over 2×105 and a high signal-to-noise ratio at 105.9 GHz. The Q-factor of the open resonator can be varied by rotating the output mirror to change the angle between the directions of the conducting stripes on the two mirrors
Keywords :
Q-factor; mirrors; resonators; submillimetre wave devices; 105.9 GHz; Gaussian-beam open resonator; Q-factor; circular coupling regions; conducting stripes; high-Q open resonator; mode conversion; output mirror; partially transparent circular region; quasi-optical coupling regions; signal-to-noise ratio; spherical mirrors; weak coupling; Apertures; Diffraction; Electromagnetic coupling; Electromagnetic waveguides; Gaussian processes; Millimeter wave measurements; Millimeter wave technology; Mirrors; Optical coupling; Q factor;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
