Abstract: | This paper reports crystal growth and optical characteristics of dysprosium (Dy3+) and erbium (Er3+) doped mid‐infrared laser crystal ternary‐potassium‐lead‐chloride (KPb2Cl5). Two transparent crystals with good optical quality have been grown successfully by using the Bridgman technique,the largest crystal size reaches up to ??10×60mm2. Measurements of X‐ray diffraction(XRD) and absorption spectra were carried out. Based on Judd‐Ofelt theory, the intensity parameters Ωt(t=2,4,6), the experimental and theoretical oscillator strengths have been obtained.The intensity parameters Ωt(t=2,4,6) of Er3+:KPb2Cl5 were calculated to be Ω2=5.10×10‐20 cm2, Ω4=1.25×10‐20 cm2, Ω6=0.83×10‐20 cm2, and the values for Dy3+:KPb2Cl5 were calculated to be Ω2=6.26×10‐20 cm2, Ω4=2.45×10‐20 cm2, Ω6=0.04×10‐20 cm2 respectively. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |