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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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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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The Electromagnetic Spectrum

Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...

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Related Experiment Video

Updated: Jun 5, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
09:10

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Room temperature continuous wave milliwatt terahertz source.

Maik Scheller1, Joe M Yarborough, Jerome V Moloney

  • 1Desert Beam Technologies LLC, Tucson, AZ 85705, USA. maik.scheller@physik.uni-marburg.de

Optics Express
|January 4, 2011
PubMed
Summary
This summary is machine-generated.

We developed a continuous wave terahertz source using a novel laser design. This new terahertz generation method achieves high efficiencies and covers the entire terahertz gap spectrum.

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Related Experiment Videos

Last Updated: Jun 5, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Published on: December 5, 2025

Continuous-wave Thulium Laser for Heating Cultured Cells to Investigate Cellular Thermal Effects
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Published on: June 30, 2017

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
07:28

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Area of Science:

  • Optics and Photonics
  • Terahertz Spectroscopy
  • Laser Physics

Background:

  • Terahertz (THz) radiation is crucial for various scientific applications.
  • Generating tunable and efficient THz sources remains a challenge.

Purpose of the Study:

  • To present a novel continuous wave (CW) terahertz source.
  • To demonstrate high conversion efficiencies and broad spectral coverage.

Main Methods:

  • Intracavity difference frequency generation (DFG) within a dual-color vertical external cavity surface-emitting laser (VECSEL).
  • Utilizing a nonlinear crystal with a surface-emitting phase-matching scheme.

Main Results:

  • Achieved high conversion efficiencies due to the phase-matching scheme.
  • Demonstrated tunability of dual mode spacing to cover the entire THz gap.
  • Terahertz output scales quadratically with intracavity intensity.

Conclusions:

  • The developed VECSEL-based DFG offers a promising route to efficient and tunable THz sources.
  • Potential for high milliwatt-level terahertz output power.