Glass Types

Glass Name	Description	Refractive Index	TCE in/in/C	Relative Cost
Water White	Our standard choice for 1mm substrates. It is equivalent to BK7 in transmission and wavefront quality when using 1mm thick substrates.	1.517 at 546nm	90.6 x 10^-7	No extra charge
B270	Crown glass, used as an equivalent replacement to BK7 for 2mm - 3mm thick substrates	1.523 at 588nm	95 x 10^-7	Low-Med
BK7	Crown glass, high optical quality by which other glasses are compared; standard choice for substrates 3mm thick or greater	1.517 at 588nm	83 x 10^-7	Medium
Fused Silica	High optical quality; low thermal coefficient of expansion	1.458 at 589nm 1.444 at 1545nm	5.7 x 10^-7	High
Borofloat	Float glass	1.471 at 588nm	32.5 x 10^-7	Low-Med

Glue Types

Glue Name	Use	Refractive Index (n)	Transmission % specified at 25-40 micron thickness	TCE in/in/C
NOA 61: UV cure	Most non-fiberoptic applications	1.54-1.575	>96% from 400-2000nm
NOA 63: UV cure	Most non-fiberoptic applications	~1.56	>98% from 350-1300+nm
Epo-Tek 301-2: heat cure	Higher power density such as laser applications	1.564	>98% from 550-2000nm	62 x 10^-6
Epo-Tek 353ND: heat cure	DWDM/FiberOptic: (Amber color in visible)	1.560	>95% from 700-2000nm	54 x 10^-6
Dymax OP-4-20639: UV cure	DWDM/FiberOptic	1.470	>93% from 1400-2000nm	223 x 10^-6