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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:

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Electro-optically tunable microwave source based on composite-cavity microchip laser.

Yunfei Qiao1, Shilie Zheng, Hao Chi

  • 1Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

Optics Express
|December 25, 2012
PubMed
Summary
This summary is machine-generated.

This study demonstrates a compact, tunable microwave source using a specialized laser cavity. The device achieves continuous frequency tuning up to 14.12 GHz by manipulating laser polarization states.

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Area of Science:

  • Optoelectronics and Photonics
  • Microwave Engineering
  • Laser Physics

Background:

  • Development of compact and tunable microwave signal generators is crucial for various applications.
  • Existing methods often lack continuous tunability or compactness.
  • Microchip lasers offer a platform for miniaturized laser systems.

Purpose of the Study:

  • To demonstrate a compact and electrically tunable microwave source.
  • To achieve continuous frequency tuning of microwave signals.
  • To utilize a diode-pumped composite laser cavity for microwave generation.

Main Methods:

  • A diode-pumped composite Nd:YAG-LiNbO(3) cavity microchip laser was employed.
  • An electro-optical element introduced intra-cavity birefringence for electric tuning.
  • Two orthogonal polarization modes of the laser's longitudinal mode were generated and controlled.

Main Results:

  • A continuously tunable microwave signal was successfully generated.
  • The microwave signal frequency reached up to 14.12 GHz.
  • The tuning was achieved by beating the two polarization modes on a high-speed photodetector.

Conclusions:

  • A compact and electrically tunable microwave source based on a microchip laser is feasible.
  • The proposed method allows for continuous frequency tuning of microwave signals.
  • This technology has potential for applications requiring compact, tunable microwave generation.