1. Test & Measurement
    2. Research

    New pumping scheme increases efficiency of blue upconversion lasers

    Feb. 1, 1995
    Researchers at the Center for Research and Education in Optics and Lasers (CREOL, Orlando, FL) have proposed a direct pumping method for Yb3+ and Tm3+ codoped fluoride crystals that promises to be more efficient than existing schemes. The Tm3+ ions are directly populated by pumping at 780 nm, then a twoste¥process transfers energy to Yb3+ and back to Tm3+ ions; excitedstate Tm3+ ions then radiatively decay at blue wavelengths.

    Researchers at the Center for Research and Education in Optics and Lasers (CREOL, Orlando, FL) have proposed a direct pumping method for Yb3+ and Tm3+ codoped fluoride crystals that promises to be more efficient than existing schemes. The Tm3+ ions are directly populated by pumping at 780 nm, then a twoste¥process transfers energy to Yb3+ and back to Tm3+ ions; excitedstate Tm3+ ions then radiatively decay at blue wavelengths.

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