1. They are also used in optical parametric oscillators and some interferometers. 2. In microwave electronics, YAG based parametric oscillators operate in the same fashion. 3. Parametric oscillators are used in several areas of physics.4. When operated at pump levels below oscillation, the parametric oscillator can resistance. 5. Parametric oscillators are used in many applications.6. The classical varactor parametric oscillator oscillates when the diode's capacitance is varied periodically. 7. Parametric oscillators have been developed as low-noise amplifiers, especially in the radio and microwave frequency range.8. The classical varactor parametric oscillator consists of a semiconductor varactor diode connected to a resonant circuit or cavity resonator. 9. In the optical parametric oscillator the initial idler and signal waves are taken from background waves, which are always present. 10. His research and published articles at that time pertained to nonlinear optics, optical fibers, parametric oscillators and parametric amplifiers.
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