A detector system, filter therefor, and method of making same is
disclosed. The filter includes an interference element having a
reflection band disposed primarily in the near infrared, and having a
high transmission over most of the visible region. The filter also
includes an absorptive element that absorbs light non-uniformly over the
visible region. The filter when combined with a semiconductor photodiode
or other suitable detector yields a detector system whose spectral
responsivity closely matches the visual response of the human eye.