【摘要】 本文报道了三价铬离子在钼酸钾铝、钨酸铝、铌酸铝和钽酸铝中的荧光光谱和荧光寿命测量结果。高电价阳离子的极化效应使铬离子所处的晶格场减弱,因此T₂到⁴A₂的振动电子跃迁光谱峰值出现在长于800nm的波段。这些材料有足够强的电子-声子耦合强度,荧光带较宽,有可能作为红外可调谐激光材料。更多还原

【Abstract】 The fluorescent spectra and fluorescent lifetime measurement of the ions Cr³⁺ in four oxides （the potassium aluminium molybdate, the aluminium tungstate, the aluminium niobate and the aluminium tantalate） are reported. The wavelength of the fluorescent peaks of these samples is longer and their linewidth is wider than that of Alexandrite and many other ohromium-doped tunable laser materials. The crystal field of the Cr³⁺ ions is weaken by polarization effect of the high valent-cations, so the wavelength of the ⁴T₂-⁴A₂ vibronic transition is moved to the infrared side. These materials have strong enough electron-phonon coupling or large enough Huang-Ehyg factors. In this way one can expect to obtain a series of tunable laser materials which have wide tunable range and the wavelength of emission peaks longer than 800 nm.更多还原