用提拉法生长了新型激光晶体Yb³⁺:GdTaO₄,测量了它的吸收和光致发光光谱,计算了它的光谱特性参数。Yb³⁺:GdTaO₄的吸收半峰全宽(FWHM)为56 nm,约为Yb³⁺:YAG的2.4倍;吸收峰为930,957,974 nm,吸收截面分别为0.81×10^-20,0.91×10^-20,1.2×10^-20 cM²;光致发光发射主峰为1016,1035 nm的FWHM分别为42,57 nm,为Yb³⁺:YAG的4-6倍,发射截面约为2.29×10^-20,1.36×10^-20 cM²,与Yb³⁺:YAG相当。它的宽吸收带有利于降低抽运激光二极管(LD)的温度调控依赖,宽的发射带则有利于实现超短脉冲和可调谐激光输出。结果表明Yb³⁺:GdTaO₄是非常有希望的全固态超短脉冲激光、可调谐激光的工作物质。

Yb³⁺:GdTaO₄ was grown by Czochralski method. Its absorption,photoluminescence spectra were measured,and its spectral property parameters were computed. Full width at half maximum (FWHM) of absorption of Yb³⁺:GdTaO₄ is 56 nm,which is 2.4 times broader than that of Yb³⁺:YAG. Its absorption peaks are at 930,957 and 974 nm,whose absorption cross sections are 0.81×10^-20,0.91×10^-20,and 1.2×10^-20 cM²,respectively. The main peak of photoluminescence is at 1016 nm. The FWHM of emission peaking at 1016 and 1035 nm are 42 and 57 nm,which are 4-6 times wider than that of Yb³⁺:YAG,corresponding cross sections are 2.29×10^-20 and 1.36×10^-20 cM²,respectively,which are a little higher than or equal to that of Yb³⁺:YAG. Its broad absorption band makes for decreasing the dependence on the temperature control of pump laser diode (LD),and broad emission band makes for realizing laser output of ultra-short pulse and tunable laser. Results indicate that Yb³⁺:GdTaO₄ is a very promising laser medium used in all-solid state ultra-short pulsed and tunable lasers.