Parametric oscillator

About: Parametric oscillator is a research topic. Over the lifetime, 5836 publications have been published within this topic receiving 95631 citations. The topic is also known as: Parametric excitation.

Tunable narrowband source of a coherent radiation

Abstract: A tunable narrowband source of a coherent radiation, comprising a first optical parametric oscillator (OPO1) which includes at least one first optical parametric amplifier medium (K 1 ) in a resonator (18, 20; 20, 34) or an optical parametric generator; at least one second optical parametric oscillator (OPO2) which includes at least one second optical parametric amplifier medium (K 2 ) in a resonator (22, 24) and into which is coupled the output radiation (28; 28b) of the first optical parametric oscillator (OPO1); at least one third optical parametric amplifier medium (OPA) into which is coupled the output radiation (30) of the second optical parametric oscillator (OPO2); and means (12, 14, 16, 26) for generating and coupling the pump radiation (10, 10') into the first and second optical parametric oscillators (OPO1, OPO2) and into the third optical parametric amplifier medium OPA), wherein the output radiation (28; 28b) of the first optical parametric oscillator (OPO1) which is coupled into the second optical parametric oscillator (OPO2) has a bandwidth which is smaller than the spacing of the only one longitudinal mode is excited and coupled into the third optical parametric amplifier medium (K 3 , K 4 ) and amplified therein.

A dispersive nanoSQUID magnetometer for ultra-low noise, high bandwidth flux detection

Abstract: We describe a dispersive nanoSQUID (nanoscale superconducting quantum interference device) magnetometer comprised of two variable thickness aluminum weak-link Josephson junctions shunted in parallel with an on-chip capacitor. This arrangement forms a nonlinear oscillator with a tunable 4–8 GHz resonant frequency with a quality factor Q = 30 when coupled directly to a 50 Ω transmission line. In the presence of a near-resonant microwave carrier signal, a low frequency flux input generates sidebands that are readily detected using microwave reflectometry. If the carrier excitation is sufficiently strong, then the magnetometer also exhibits parametric gain, resulting in a minimum effective flux noise of 30 nΦ0 Hz−1/2 with 20 MHz of instantaneous bandwidth. If the magnetometer is followed with a near-quantum-noise-limited Josephson parametric amplifier, we can increase the bandwidth to 60 MHz without compromising sensitivity. This combination of high sensitivity and wide bandwidth with no on-chip dissipation makes this device ideal for local sensing of spin dynamics, both classical and quantum.

Noise in a Driven Josephson Oscillator

Abstract: The effect of noise on the microwave-induced steps in the current-voltage characteristic of a Josephson junction is investigated theoretically. The dynamic resistance of a step is obtained in the limit that the capacitance of the junction is small. The phase fluctuations of the junction are greatly reduced in the presence of the microwave signal, and the dynamic resistance can be extremely small.