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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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Mid-IR laser oscillation in Cr2+:ZnSe planar waveguide.

J E Williams1, V V Fedorov, D V Martyshkin

  • 1Department of Physics, University of Alabama at Birmingham, 1300 University Blvd, Birmingham, AL 35295, USA. jwill18@uab.edu

Optics Express
|December 18, 2010
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Summary

Researchers achieved room-temperature mid-infrared lasing at 2.6 µm using chromium-doped zinc selenide (Cr2+:ZnSe) planar waveguides. This technology also enabled passive Q-switching for an erbium-doped yttrium aluminum garnet (Er:YAG) laser.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Laser Physics

Background:

  • Mid-infrared (MIR) lasers are crucial for various applications, including spectroscopy and free-space communications.
  • Developing compact, room-temperature MIR laser sources remains a significant challenge.
  • Chromium-doped II-VI semiconductors offer promising gain media for MIR applications.

Purpose of the Study:

  • To demonstrate room-temperature lasing in a planar waveguide structure operating in the mid-infrared region.
  • To investigate the potential of chromium-doped zinc selenide (Cr2+:ZnSe) thin films for laser applications.
  • To explore the use of Cr2+:ZnSe/sapphire structures for passive Q-switching.

Main Methods:

  • Planar waveguides were fabricated using pulsed laser deposition (PLD).
  • Thin films of chromium-doped zinc selenide (Cr2+:ZnSe) were deposited on a sapphire substrate.
  • The optical properties and lasing performance of the Cr2+:ZnSe/sapphire waveguides were characterized.
  • Passive Q-switching of an Er:YAG laser was demonstrated using a highly doped Cr2+:ZnSe/Sapphire thin film.

Main Results:

  • Room-temperature lasing was successfully achieved at a wavelength of 2.6 µm in the Cr2+:ZnSe/sapphire planar waveguide.
  • The pulsed laser deposition method enabled the fabrication of high-quality, highly doped thin films.
  • Passive Q-switching of an Er:YAG laser at 1.645 µm was demonstrated, showcasing the material's nonlinear optical properties.

Conclusions:

  • Cr2+:ZnSe/sapphire planar waveguides are a viable platform for realizing room-temperature mid-infrared laser sources.
  • The fabrication technique allows for the creation of materials suitable for both direct lasing and nonlinear optical applications.
  • This work contributes to the development of compact and efficient MIR laser technologies.