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<p>According to the single-frequency phonon model, the lower phonon energy of YAlO<sub>3</sub> (YAP) compared to Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> (YAG) is expected to enable more efficient laser cooling in Yb<sup>3+</sup>-doped YAP. We present the first experimental comparison of anti-Stokes fluorescence cooling in 2% Yb<sup>3+</sup>-doped YAP and YAG crystals. Yb<sup>3+</sup>: YAP exhibits a broader cooling spectral range (1020–1070&#xa0;nm) than Yb<sup>3+</sup>: YAG (1020–1055&#xa0;nm). A minimum achievable temperature (MAT) of ~ 249.7&#xa0;K is obtained for Yb<sup>3+</sup>: YAP at 1040&#xa0;nm, which is notably lower than that of ~ 259.3&#xa0;K observed for Yb<sup>3+</sup>: YAG. Further analysis predicts ultimate cooling limits of ~ 167&#xa0;K for Yb<sup>3+</sup>: YAP and ~ 171&#xa0;K for Yb<sup>3+</sup>: YAG from room temperature. These findings highlight the superior cooling performance of Yb<sup>3+</sup>: YAP and support its potential application in high-power radiation-balanced lasers (RBLs).</p>

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Comparison of Yb3+: YAP with Yb3+: YAG cooling crystals

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  • 发表日期：

    2026年4月27日

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  • Chaoyu Wang,
  • Jianping Yin

摘要

According to the single-frequency phonon model, the lower phonon energy of YAlO3 (YAP) compared to Y3Al5O12 (YAG) is expected to enable more efficient laser cooling in Yb3+-doped YAP. We present the first experimental comparison of anti-Stokes fluorescence cooling in 2% Yb3+-doped YAP and YAG crystals. Yb3+: YAP exhibits a broader cooling spectral range (1020–1070 nm) than Yb3+: YAG (1020–1055 nm). A minimum achievable temperature (MAT) of ~ 249.7 K is obtained for Yb3+: YAP at 1040 nm, which is notably lower than that of ~ 259.3 K observed for Yb3+: YAG. Further analysis predicts ultimate cooling limits of ~ 167 K for Yb3+: YAP and ~ 171 K for Yb3+: YAG from room temperature. These findings highlight the superior cooling performance of Yb3+: YAP and support its potential application in high-power radiation-balanced lasers (RBLs).