Dy3＋：La2CaB10O19晶体生长和光谱性能

Crystal Growth and Optical Properties of Dy^(3+)-Doped La_2CaB_(10)O_(19) Crystals

La2CaB10O19(LCB)是一种性能优良的非线性光学晶体,通过顶部籽晶法生长出了较高质量的掺杂Dy3+离子的LCB晶体,尺寸为40mm×25mm×15mm,其中Dy3+离子的4F9/2-6 H13/2能级跃迁可以发射575nm的黄色激光,该激光有望在医学和生物检测研究等领域得到应用。通过对该晶体的b面进行摇摆曲线测量,得到其半峰全宽为16.2″。对Dy3+:LCB晶体的室温吸收光谱进行测量,并利用452nm波长的激光进行激发,测量荧光光谱,得到575nm处较强光谱峰,此波段荧光寿命为636μs。通过Judd-Ofelt理论计算了其光谱参数:唯象参数、吸收振子强度、自发辐射几率、吸收和发射截面和辐射寿命等。

La2CaB10 O19 （LCB） is a favourable nonlinear optical crystal. Dy3＋ doped La2CaB10 O19 crystal of good quality with a size of 40 mm × 25 mm× 15 mm has been grown by the top-seeded solution growth method. The 4 F9/2-6 H13/2 transition of Dy3＋ ion can emit 575 nm yellow laser, which may be applied in the medicine and biological detection. The rocking curve measurement showed that the full width at half maximum is 16.2 in the b plane. The absorption spectra of Dy3＋ ：LCB were measured at room temperature. The sample was excited at the 452 nm radiations and the fluorescence spectrum was obtained, in which the strongest peak was at 575 nm. The fluorescence lifetime was 636 gs at the 575 nm emission. The Judd-Ofelt （J-O） theory was applied to the evaluation of the spectral properties. The J-O parameters, absorption oscillator strength, the absorption and emission cross section and radiative lifetime were calculated which show Dy3＋ ：LCB crystal is a promised yellow laser material.