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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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Bi-frequency operation in a membrane external-cavity surface-emitting laser.

Jake Daykin1, Jonathan R C Woods2, Roman Bek3

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Researchers achieved continuous wave bi-frequency operation in a membrane external-cavity surface-emitting laser (MECSEL). This was enabled by controlling intra-cavity laser modes using spatially specific mirror loss patterns.

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Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Continuous wave (CW) lasers are crucial for various applications.
  • Bi-frequency operation allows for precise control and novel applications in spectroscopy and metrology.
  • Membrane External-Cavity Surface-Emitting Lasers (MECSELs) offer compact and scalable laser solutions.

Purpose of the Study:

  • To demonstrate continuous wave bi-frequency operation in a MECSEL.
  • To investigate the use of spatially specific intra-cavity loss for mode control.
  • To achieve simultaneous oscillation on two distinct spatial modes.

Main Methods:

  • Optically pumping a MECSEL with up to 4 W of 808 nm light.
  • Creating spatially specific loss patterns on the intra-cavity high reflectivity mirror using laser ablation with a digital micromirror device (DMD).
  • Aligning laser cavity modes with custom-designed crosshair loss patterns.

Main Results:

  • Successful continuous wave bi-frequency operation was achieved.
  • Simultaneous oscillation on the fundamental HG00 and higher-order HG11 spatial modes was demonstrated.
  • Bi-frequency operation was sustained over a range of pump powers and spatial loss feature sizes.
  • A stable wavelength separation of approximately 5 nm centered at 1005 nm was observed.

Conclusions:

  • Spatially specific intra-cavity loss is an effective method for controlling transverse cavity modes in MECSELs.
  • This technique enables stable bi-frequency operation in a compact laser system.
  • The demonstrated bi-frequency MECSEL has potential applications in areas requiring dual-wavelength emission.