VP Grating Structures
Grating material: Dichromated Gelatin
Grating substrates: BK7, Fused Silica, etc.
Anti-reflective coatings on substrate-air surfaces.
Encapsulated nature protects gelatin from environment over a range in temperature and humidity.
Encapsulated nature allows surfaces to be cleaned without risk to grating.
Lifetimes of at least 20 years if properly handled.