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Reduced phase-matching temperature in magnesium-doped lithium niobate crystals grown from ternary MgO-Li2O-Nb2O5 system
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DOI：10.1088/1361-6463/ae6283.png)
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Abstract
En 中文
As a classic frequency-doubling crystal for the visible spectra range, heavily magnesium-doped lithium niobate (LN:Mg) has long been hindered in its application to compact and thermally stable laser systems by its intrinsically high phase-matching temperature. In this study, a series of MgO-doped LiNbO3 crystals were grown from the ternary MgO-Li2O-Nb2O5 system, and their optical and nonlinear optical properties were systematically characterized. Compared with crystals grown from the conventional congruent binary Li2O-Nb2O5 system, the as-grown crystals from the ternary system exhibit markedly improved optical quality, enhanced optical damage resistance, and superior frequency-doubling performance. In particular, the LiNbO3 crystal doped with 6.0 mol.% MgO achieves an optical damage resistance threshold of 6.5 MW cm(-2), which is an order of magnitude higher than that of the 5.0 mol.% MgO-doped LiNbO3 crystal grown from the binary system. Meanwhile, a high SHG conversion efficiency of 30.7% for a 1064 nm pulsed laser is realized at a reduced phase-matching temperature of 45.1 degrees C, with a corresponding temperature bandwidth of 1.5 degrees C. These results demonstrate that compositional modulation via the ternary system is an effective strategy to simultaneously improve the crystal quality and nonlinear optical performance of MgO-doped LiNbO3 crystals. The greatly optimized frequency-doubling properties underscore the significant application potential of the as-prepared LN:Mg crystals as efficient frequency converters for advanced compact green laser systems.a
Keywords:
MgO-doped LiNbO3 crystals
ternary MgO-Li2O-Nb2O5 system
optical damage resistance
phase-matching temperature
second harmonic generation
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4.9W
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