基于Fe2+:ZnSe微米粉末嵌入ZBLAN玻璃的4.32μm中红外随机激光

4.32 μm mid-infrared random lasing based on ZBLAN glass containing micro-sized Fe2+:ZnSe powder

在室温下制备了基于Fe^2+:ZnSe微米粉末嵌入ZBLAN(ZrF4-BaF2-LaF3-AlF3-NaF)玻璃的中红外随机激光器,随机激光的中心波长约为4.32μm。Fe^2+:ZnSe微米粉末的平均晶粒尺寸为3.54μm,XRD结果表明Fe^2+:ZnSe微米粉末为立方闪锌矿结构。在2.94μm纳秒脉冲激光泵浦下,随机激光的阈值为557.89mJ/cm^2。随着泵浦能量的增加,随机激光多纵模的特点也随之出现。泵浦能量超过阈值后,随机激光的光谱线宽为10nm,脉冲宽度为50ns。这项工作为获得稳定的中红外激光源提供了一种简单而经济的方法,将粉末嵌入固体基质中可以对粉末起到稳定的作用,这种方法在制备中红外光子器件和光纤激光器上具有潜在前景。

Mid-infrared random laser based on Fe^ 2+ doped ZnSe powders embedded in ZBLAN glass with a center wavelength at ~4.32 μm is developed at room temperature.The average grain size of micro-sized Fe^ 2+:ZnSe powder is 3.54 μm,and the XRD results indicated that the micro-sized Fe^ 2+:ZnSe powders are of cubic zinc blende structure.The threshold of the random laser is 557.89 mJ/cm 2 under the 2.94 μm nanosecond pulse laser.The characteristic of the multi-longitudinal mode of random laser appears with the increasing of pump energy.As the pump energy increases until it exceeds the threshold,the random laser has a narrow spectral line-width of 10 nm,and the steady pulse width drops to 50 ns.This work provides a simple and cost-effective way to obtain stable mid-IR laser source.Embedding powders into solid host can be an appropriate method to stabilize powders,especially for middle-infrared lasing powders,which have the potential use for fabricating middle-infrared photonic devices and fiber laser.