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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end.
Reflection of Waves01:07

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

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Published on: August 5, 2013

Waveguide resonators with a phase-conjugate mirror.

G P Agrawal, J L Boulnois

    Optics Letters
    |August 28, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study explores phase-conjugate waveguide resonators, demonstrating their ability to discriminate transverse modes while maintaining low loss for the fundamental mode. This innovation allows for compact designs with excellent beam quality.

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    Area of Science:

    • Optics and Photonics
    • Waveguide Technology

    Background:

    • Traditional waveguide resonators face challenges in achieving both compactness and high beam quality.
    • The integration of phase-conjugate mirrors offers a novel approach to resonator design.

    Purpose of the Study:

    • To investigate the performance of a waveguide resonator incorporating a phase-conjugate mirror.
    • To assess the resonator's capability for transverse-mode discrimination and coupling loss.

    Main Methods:

    • Theoretical analysis of a waveguide resonator with one mirror replaced by a phase-conjugate mirror.
    • Modeling the resonator using an effective finite mirror size.

    Main Results:

    • The phase-conjugate waveguide resonator demonstrates effective transverse-mode discrimination.
    • Low coupling loss is achieved for the fundamental waveguide mode.

    Conclusions:

    • Phase-conjugate waveguide resonators enable simultaneous achievement of compactness and good beam quality.
    • This design presents a promising advancement for integrated optical devices.