Profile: Andover Corporation specializes in the manufacturing of optical filters and coatings. We are an ISO 9001 certified company. Our products include bandpass filters, neutral density filters, heat control filters, dichroic filters, anti-reflection coatings, filter wheels, temperature controllers, calibration filters, filter glass and epoxy filters. Our neutral density filters are used as attenuators for broadband spectral sources, partial reflectors for light balancing applications and for use as neutral beam-splitters. Our hot mirrors reflect the heat and transmit the visible light. Our long wave pass filters provide a sharp cut-off below a particular wavelength.