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The phosphate glasses doped with rare earth ions have been widely used in laser mediums and optical filter 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。
Digital filter is the basic arithmetic of language, picture processing, model recognition and spectrum analysis.
数字滤波器是语言、图象处理、模式识别以及谱分析中的基本运算的处理运算。
It was found that the transmission spectrum of the filter is the cosine function modulated reflection spectrum of the fiber grating.
结果表明该滤波器的透射光谱是余弦函数调制后的光纤光栅反射光谱。
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