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October 28, 2011

Mtg: Recent Advances in Green and Blue Laser Diodes Fabricated on Nonpolar/Semipolar GaN Substrates

by @ 4:16 pm. Filed under ALL, Optics/Displays, Semiconductors

TUESDAY November 1, 2011
SCV Photonics Chapter
Speaker: Dr. James W. Raring, Vice President of Laser Engineering, Soraa Inc.
Time: Networking and light dinner at 6:00 PM; Presentation at 7:00 PM
Cost: none
Place: Keypoint Credit Union, 2805 Bowers Ave, Santa Clara
RSVP: from the website

Fueled by rapid progress toward the commercialization of the direct-diode green laser and the introduction of innovative new display technologies based on blue-laser diode pumped green phosphors, we are entering a paradigm shift for projection displays that will require a massive deployment of GaN-based laser diodes.? By combining direct green laser diodes with the already available red and blue laser diodes, a compact, highly-efficient, low-cost R-G-B laser-based light engine is realized to enable brilliant miniature displays with enhanced viewing flexibility.? These miniature displays, or so-called pico projectors, will see proliferation into smart-phones, cameras, and other handheld devices. In parallel to the rapid progress in these small scale displays, we are in the midst of a swift technology shift in high lumen output projectors serving markets such as desktop projectors, home theater, digital advertising, and cinema where conventional bulb illumination is being replaced with laser diode based illumination.? The cumulative result of these new consumer applications requiring GaN-based blue and green laser will drive the next boom in laser diode demand.
Soraa Inc. is pursuing the unconventional nonpolar and semipolar orientations of bulk GaN for the development of high performance green and blue laser diodes.? These novel orientations provide superior physics over the conventional c-plane orientation, which suffers from internal polarization fields that spatially separate the electron and hole wavefunctions in the light emitting quantum well regions.? Such internal fields reduce the radiatiave recombination efficiency and introduce design constraints on the epitaxial and device structure.? Free from these restrictions, Soraa is making rapid progress towards the commercialization of blue and green laser diodes with the demonstrations of the first true green (525nm) continuous wave laser diode and world-class power and efficiency from single-mode blue laser diodes.

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