PRESSURE-DEPENDENCE OF SM-YAG FLUORESCENCE TO 50 GPA - A NEW CALIBRATION AS A HIGH-PRESSURE SCALE

The pressure-induced wavelength shift of laser excited fluorescence fr om samarium doped yttrium aluminum garnet (Sm:YAG) was measured up to 50 GPa at room temperature against the R1 shift of ruby. The intense p eaks between 618 and 611 nm were analyzed as triplet, Y1, Y2, and Y3, by curve fitting analysis using the Lorentzian function. The Y1 (lambd a(0)=618 nm) peak was the strongest peak up to 40 GPa, while the Y2 (l ambda(0)=616 nm) peak became the strongest above it. Based upon the pr essure dependency of the YI and Y2 peaks, the following pressure scale s are proposed: P=3.25X Delta lambda((Y1))-0.015X Delta lambda((Y1))(2 );P=4.03X Delta lambda((Y2))-0.055X Delta lambda((Y2))(2). As the temp erature dependence of the fluorescence shift of Sm:YAG is negligibly s mall, these pressure scales will be useful for high pressure and high temperature experiments using a diamond anvil cell.