Light source device and light filtering assembly

The invention relates to a light filtering assembly which comprises a first interference film and a second interference film, wherein the first interference film comprises multiple first film layers and multiple second film layers; the first film layers and the second film layers are stacked in a mutually alternate manner; the second interference film comprises multiple third film layers and multiple fourth film layers; the third film layers and the fourth film layers are stacked in a mutually alternate manner; and the optical constant of the first film layers is the same as the optical constant of the third film layers, the optical constant of the second film layers is the same as the optical constant of the fourth film layers, and the optical path difference generated by the first interference film is different from the optical path difference generated by the second interference film. 种光滤波组件包括第干涉膜与第二干涉膜。第干涉膜包括多层第膜层与多层第二膜层。这些第膜层与这些第二膜层彼此交替堆迭。第二干涉膜包括多层第三膜层与多层第四膜层。这些第三膜层与这些第四膜层彼此交替堆迭。第膜层的光学常数与第三膜层的光学常数相同，第二膜层