Abstract: An improved detector assembly restricting light striking a detector within the assembly to a relatively narrow bandwidth and techniques for fabricating the same. A pliable material is impregnated with a coloring agent selected so that the material provides a filtering effect admitting light within a range including a predetermined wavelength, with the wavelength having a value based on a wavelength of a laser to be employed with the detector assembly. The pliable material is shaped so as form a capsule enclosing a detector, with the capsule including a hemispherical lens element as an integral part of the capsule. The hemispherical lens element is coated with a filter coating selected to provide a filtering effect complementary to that provided by the coloring agent, such that the combined filtering effects provided by the filter coating and the coloring agent provide a bandpass filtering effect.