Glass and quartz glass envelopes are most commonly used in incandescent light bulbs but do not transmit well in the infrared, sapphire is a much better choice. The EP emitter has a patented design that integrates a sapphire window with a tungsten filament in a sealed metallic package, providing a robust source for spectroscopic instruments.
Tungsten filaments are provided in a variety of sizes to accommodate various frequency and modulation requirements. Operating temperatures up to 1,900K are standard with the EP source, all the devices include a gold plated parabolic reflector and an inert gas backfill.