The pure and Nd³⁺-doped YMgB₅O₁₀ (YMB,Nd:YMB) crystals were grown successfully by the top-seeded solution growth method with composite fluxes, namely, Li₂O–B₂O₃–LiF. The systematic investigation of the crystal structure, transmission spectrum, band gap, thermal properties, laser damage threshold and hardness for the YMB crystal, and polarized absorption and fluorescence spectra, fluorescence lifetimes and laser propeties for the Nd:YMB crystal were reported. Based on the J–O theory, spectroscopic parameters (including line strengths, J–O intensity, spontaneous transition rates, fluorescence branching ratios and radiative lifetimes) have been calculated in detail. The excellent physicochemical properties, such as the large band gap (5.6 eV), laser damage threshold (2.6 GW cm⁻²), hardness (6.5 Mohs) and thermal conductivity (5.94 W m⁻¹ K⁻¹, RT), show the great potential applied to the high-power laser system. The wide absorption band (FWHM, 21.2 nm, E//Y) at around 800 nm makes Nd:YMB quite suitable for the efficient pumping of AlGaAs laser diodes. The intense multi-wavelength emissions and spectral anisotropy characteristics can be observed clearly in the 850–930 nm, 1020–1100 nm and 1300–1430 nm polarized fluorescence spectra, which make it possible to realize multi-wavelength laser operation at around 0.89, 1.06 and 1.32 μm, respectively. The dual-wavelength Nd:YMB laser working at 1054 and 1090 nm with a maximum output power of 1.3 W and a slope efficiency of 31.9% was generated, which may be a potential light source for THz generation with a large frequency difference of 9.4 THz through difference frequency interactions. The results indicate that Nd:YMB is a promising multi-wavelength laser crystal.

中文翻译：

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YMgB5O10晶体的制备及掺杂Nd3 +离子的诱人多波长发射特性

通过掺有助熔剂Li ₂ O–B ₂ O ₃的顶种子溶液生长法成功地生长了纯Nd ³⁺掺杂的YMgB ₅ O ₁₀（YMB，Nd：YMB）晶体。–LiF。对YMB晶体的晶体结构，透射光谱，带隙，热性质，激光损伤阈值和硬度以及Nd：YMB晶体的偏振吸收光谱和荧光光谱，荧光寿命和激光性能进行了系统研究。根据J–O理论，已经详细计算了光谱参数（包括线强度，J–O强度，自发转变速率，荧光分支比和辐射寿命）。优异的理化性质，例如大的带隙（5.6 eV），激光损伤阈值（2.6 GW cm ^-2），硬度（6.5 Mohs）和热导率（5.94 W m ^-1 K ^-1，RT），显示了应用于大功率激光系统的巨大潜力。宽吸收带（FWHM，21.2 nm，E // Y）在800 nm左右，使得Nd：YMB非常适合高效泵浦AlGaAs激光二极管。在850-930 nm，1020-1100 nm和1300-1430 nm偏振荧光光谱中可以清楚地观察到强烈的多波长发射和光谱各向异性特性，这使得在0.89、1.06左右实现多波长激光操作成为可能。和1.32μm。产生了工作在1054和1090 nm的双波长Nd：YMB激光器，其最大输出功率为1.3 W，斜率效率为31.9％，这可能是产生THz的潜在光源，其频差为9.4 THz。通过不同频率的相互作用。结果表明，Nd：YMB是一种很有前途的多波长激光晶体。