Nonlinear harmonic generation and devices in doubly-resonant Kerr cavities

A method of performing nonlinear harmonic conversion comprising:

• positioning a waveguide channel for receiving and propagating electromagnetic signals;
• and
• coupling a resonant cavity to said waveguide channel, said resonant cavity structure having a plurality of resonant modes into which electromagnetic energy is coupled during the operation of said system;
• and
• changing the frequency of one of said resonant modes during operation of said system to reach either an input-signal frequency or a harmonic frequency for a majority of the time in which harmonic generation is occurring, where both reflected and harmonic fields are emitted back into said waveguide channel so as to allow efficient harmonic generation at a specified critical input power.

An oscillator system comprising:

• a waveguide channel for receiving and propagating electromagnetic signals;
• and
• a resonant cavity being coupled to said waveguide channel, said resonant cavity structure having a plurality of resonant modes into which electromagnetic energy is coupled during the operation of said system;
• said resonant modes are coupled by a Kerr nonlinearity, where reflected fields are emitted back into said waveguide channel with a specified power having oscillations that include a frequency substantially lower than any frequency of the input electromagnetic wave.