WARF: P00284US

Frequency-Narrowed High-Power Diode Laser Array Method and System


Thad Walker, Bien Chann, Ian Nelson

The Wisconsin Alumni Research Foundation (WARF) is seeking commercial partners interested in developing a method and device for producing a very narrow spectrum from a high-power diode laser array.
OVERVIEWAn important proven use for high-power diode lasers is to produce laser-polarized gas for magnetic resonance imaging applications. Currently, high power diode laser array systems put out only a fraction of the desired wavelength. For example, a 15-watt diode array may only put out one or two watts of usable power.
THE INVENTIONUW–Madison researchers have developed a high-power diode laser array system that uses an external cavity to narrow the spectral width, changing the output power from a broad spectrum to a very narrow spectrum. The light from each emitter is collimated, reflected off a diffraction grating and imaged back onto the emitter. This causes each diode to preferentially lase at the wavelength that is fed back. The result is a diode laser array that uses a much greater portion of the laser's output power.
  • Production of laser-polarized gas for MRI
  • Can be used to frequency narrow and tune commercial diode laser arrays
  • Successfully tunes and narrows a true multiple-element array (via optical feedback).
  • Lets the user adjust and set the level of feedback, which allows maximum tunability, maximum output power and a combination of tunability and output power.
  • The small curvature of linear arrays called "smile" can be compensated for using this system.
  • Can be extended to stacks of diode array bars, such as those that are currently used to provide 100 W.
For More Information About the Inventors
Contact Information
For current licensing status, please contact Emily Bauer at or 608-960-9842.
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