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Ultralow Threshold Reported for Raman Laser

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Whispering-gallery resonator sets new benchmark for Raman-laser efficiency.

Breck Hitz

How low can you go? In the quest for ever more efficient Raman lasers, investigators have achieved thresholds that have been below a milliwatt by resonating both pump and laser wavelengths in a fused-silica microsphere. But now scientists at California Institute of Technology’s Jet Propulsion Laboratory in Pasadena have fabricated a single-crystal fluorite whispering-gallery resonator demonstrating Raman-laser thresholds that they believe are orders of magnitude lower than any previous Raman laser. Their device reached threshold with only 3 μW of absorbed pump power, and they...Read full article

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    Published: March 2007
    Glossary
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    Biophotonicsfused-silica microspherephotonicsRaman lasersResearch & Technologysingle-crystal fluorite whispering-gallery resonator

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