The phosphate glasses doped with rare earth ions have been widely used in laser mediums and opticalfilter materials for their outstanding optical and spectrum characteristics.
稀土掺杂磷酸盐玻璃具有优异的光学和光谱特性，在激光介质材料、有色滤光材料等领域中有着重要的应用。
2
According to spatial filter character, a common slit can become a practical opticalfilter by adding two couples of shades.
根据空间滤波特点，在普通单缝上增加两对挡光片，使之成为一种实用的光学滤波器。
3
A new method is proposed to build a micromachined tunable opticalfilter array on glass base in visible band.