在刑侦现场勘查不同物证痕迹时，采用多波段光源对痕迹进行获取，而多波段光源是利用不同性能的干涉截止滤光片以获得不同波段的输出光.为了寻找衣物上体液和其它痕迹，利用干涉滤光片的组合方法，采取电子束蒸发并加以离子辅助沉积系统，根据薄膜干涉滤光片理论并借助膜系设计软件，制备了低成本高质量的450~520 nm波段高透射矩形波.通带透过率大于99%，其它波段透过率小于0.2%，陡度S<3%，并通过了酸碱度环境的检测.重点讨论了膜系设计中波纹产生的原因及波纹的的压缩.

In order to find out different material evidences in criminal spot, multi-band lamp house was adopted to achieve all kinds of field traces. Multi-band lamp house system can utilize interference cut-off filters of different performances to output different wave-band beams. In order to find body fluids on clothes and other traces, the high transmittance rectangular wave between 450~520 nm waveband with low-cost and high-quality was prepared through the interference filter combination method. The electronic beam depositing method with the aid of ion deposition system was also adopted based on the interference filter theory and film design software during the preparation. It is demanded that transmissivity in pass wave is more than 99%, the other wave-band is less than 0.2%, and its slope is less than 3%.