| Citation: |
WANG Wenrong, QI Meng, LI Yuanji, FENG Jinxia, ZHANG Kuanshou. Measurement of Verdet constant of Er, Yb : YAl3(BO3)4 crystal[J]. LASER TECHNOLOGY, 2025, 49(2): 223-226. DOI: 10.7510/jgjs.issn.1001-3806.2025.02.010
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In order to construct a unidirectional traveling-wave ring resonator or non-planar ring resonator that utilizes the magneto-optical effect of the laser gain medium itself without additional magneto-optical crystals, so as to meet the application requirements of preparing continuous wave single-frequency 1.5 μm solid-state lasers with power greater than watts, the Verdet constants of Er, Yb : YAl3(BO3)4 crystals were experimentally investigated by means of magneto-optical modulation technique combined with balanced detection. The Verdet constants of Er, Yb : YAl3(BO3)4 crystals at different doped atomic fractions and temperatures were obtained. The results show that the measured Verdet constants of Er, Yb : YAl3(BO3)4 crystals with different doped atomic fractions of Yb ions, namely 10%, 15% and 25%, are 48.11°/(T·m), 33.05°/(T·m) and 10.88°/(T·m), respectively. When the temperature of Er, Yb : YAl3(BO3)4 crystal with a Yb3+ doped atomic fractions of 25% is increased from 13 ℃ to 38 ℃, the Verdet constant showes a nonlinear decrease from 11.40°/(T·m) to 10.15°/(T·m). The Verdet constant of the Er, Yb : YAl3(BO3)4 crystal is comparable with that of the yttrium aluminum garnet crystal. Moreover, the crystal exhibits paramagnetism. The magneto-optic rotation performance of the gain medium can be improved by either employing the low doped crystal or lowering the crystal temperature. This study provides a reference for the construction of continuous wave single frequency solid-state lasers without additional magneto-optical crystals.
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