Witness Samples

Witness Samples are essential to maintaining accuracy, repeatability and traceability of any thin film coating operation. Witness Samples aid in the measurement of transmission and reflectivity performance. They are also used to measure the durability of a coating and verify the resistance to environmental effects like humidity, temperature, salt spray, etc.

Esco offers a full compliment of witness samples in three different configurations: Transmission, Reflection and Wedged. Most common generic indices as well as specific optical glass manufacturer's types are available. We can also supply melt specific materials at a competitive cost to our customers. Please note that specific optical glass and material pricing fluctuates, and may be subject to change.

Transmission			Reflection	8º Wedge	IR Material
F2	LAFN7	S-LAL7	KG2	UV Grade FS	CaF2
KG2	PBH56	S-NBM51	KG5	S-BSL7	Germanium
KG5	S-BAL35	S-PHM52	SF11		Sapphire
N-SF2	S-BSL7	S-TIH6	SF57		Silicon
N-SF5	S-BSM2	S-TIM35	S-BSL7		ZnSe
N-SF10	S-BSM4		S-FPL53
N-SF11	S-FPL53	UV Grade FS	UV Grade FS
SF11	S-LAH53
SF57	S-LAH58