FIELD: physics.
SUBSTANCE: tunable frequency selector has a Fabry-Perot resonator with variable optical length between mirrors. The size of constriction of the Fabry-Perot resonator mode is several times the radiation wavelength. A waveguide with mode size of several wavelengths is placed in front of the Fabry-Perot resonator. Waveguide and Fabry-Perot modes partially coincide such that the modulus of the waveguide coupling coefficient of the Fabry-Perot resonator mode is higher than the waveguide coupling coefficient of the waveguide mode reflected from the front mirror of the Fabry-Perot resonator.
EFFECT: providing the least possible optical length of an active resonator which includes a frequency selector for operation in a mode for generating one longitudinal mode of the active resonator.
9 cl, 9 dwg
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