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Related Concept Videos

Second-order Op Amp Circuits01:19

Second-order Op Amp Circuits

420
Implementing second-order low-pass filters in audio systems is crucial in refining audio signals by eliminating undesirable high-frequency noise. These filters typically involve second-order op-amp circuits configured as voltage followers, encompassing two nodes with distinct storage elements.
The analysis of such circuits follows a systematic approach, similar to the second-order RLC circuits. In practical scenarios, bulky inductors are rarely employed due to their size and weight. This means...
420

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Ultra-low-power second-order nonlinear optics on a chip.

Timothy P McKenna1,2, Hubert S Stokowski1, Vahid Ansari1

  • 1E.L. Ginzton Laboratory, Stanford University, Stanford, CA, 94305, USA.

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|August 4, 2022
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Summary
This summary is machine-generated.

Researchers developed chip-scale photonic circuits using thin-film lithium niobate for efficient second-order nonlinear optics. This breakthrough enables new quantum entanglement applications and integrated photonics platforms.

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Area of Science:

  • Photonics
  • Quantum Optics
  • Materials Science

Background:

  • Second-order nonlinear optical processes are crucial for wavelength conversion and quantum entanglement.
  • Existing silicon photonics primarily use third-order nonlinearity, lacking efficient second-order integrated platforms.
  • Developing chip-scale devices for second-order nonlinear optics is a significant challenge.

Purpose of the Study:

  • To demonstrate an integrated photonic circuit for efficient second-order nonlinear optical processes.
  • To achieve frequency doubling and parametric oscillation on a chip.
  • To explore the potential of thin-film lithium niobate for advanced photonic applications.

Main Methods:

  • Fabrication of an integrated thin-film lithium niobate photonic circuit.
  • Demonstration of efficient frequency doubling and parametric oscillation.
  • Characterization of parametric oscillation at room temperature, including degenerate and non-degenerate operation.
  • Tuning of parametric oscillator emission via pump frequency variation.
  • Observation of cascaded second-order processes.

Main Results:

  • Achieved efficient frequency doubling and parametric oscillation with a low threshold (tens of microwatts).
  • Demonstrated tunable parametric oscillation over one terahertz.
  • Observed cascaded second-order processes leading to parametric oscillation.
  • Operated the parametric oscillator at room temperature.

Conclusions:

  • Integrated thin-film lithium niobate circuits enable efficient on-chip second-order nonlinear optics.
  • These devices are crucial for advancing nonlinear and quantum photonics platforms.
  • The demonstrated technology paves the way for scalable quantum entanglement generation and manipulation.