E. Bormashenko et al., Development of new near-infrared filters based on the "sandwich" polymer-chalcogenide glass-polymer composites, OPT ENG, 40(5), 2001, pp. 661-662
A new generation of filters are presented that are ideal for blocking visib
le light while passing near-infrared radiation. These filters are based on
the novel use of selenium-based chalcogenide glasses with a low softening p
oint on the one hand, and thermoplastic polymers on the other hand. A techn
ology was developed that allows "sandwich" structures to be obtained, which
include thin layers of polymers and chalcogenide glasses. The technology p
ermits the cutoff edge of filters to be controlled with high accuracy. This
can be done either by varying components of the "sandwich" or by varying t
he thickness of the chalcogenide glass layer. (C) 2001 society of Photo-Opt
ical instrumentation Engineers.