WARF: P99252US

Single Mode Surface-Emitting Semiconductor Laser


Dan Botez, James Lopez, Gunawan Witjaksono

The Wisconsin Alumni Research Foundation (WARF) is seeking commercial partners interested in developing a single mode, single lobe surface-emitting distributed feedback semiconductor laser in which surface emission is achieved at high power levels with very high efficiency.
OVERVIEWSemiconductor diode lasers are formed of multiple layers of semiconductor materials and are useful in applications such as telecommunications, spectroscopy and magnetic resonance imaging. Surface-emitting, grating-coupled, distributed feedback lasers provide advantages such as dynamic single-mode operation, high output power, integrability with other optical components and surface emission of light in directions substantially normal to the film waveguide. However, current lasers experience issues with multimode operation, produce an undesirable double-lobed far-field beam pattern and have limited efficiency. An improved surface-emitting semiconductor diode laser is needed.
THE INVENTIONUW–Madison researchers have developed a high power surface-emitting semiconductor laser that operates in a single mode with a single lobe far-field radiation profile. The device comprises a semiconductor substrate and an epitaxial structure on the substrate that includes a layer with an active region at which light emission occurs. A distributed feedback grating is incorporated with the epitaxial structure and comprises periodically alternating grating elements to provide optical feedback.
  • Semiconductor diode lasers, particularly surface-emitting distributed feedback semiconductor lasers
  • Single lobe surface emission is achieved at high power levels with very high efficiency.
  • Laser can be constructed from a wide variety of semiconductor laser materials.
  • Single lobe far-field surface emission of light is obtained without requiring the use of lossy elements in the distributed feedback grating.
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Contact Information
For current licensing status, please contact Jeanine Burmania at or 608-960-9846.
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