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Home--Optical Coatings

Materials
Selecting a glass material is important since each glass has different optical characteristics. The index of refraction and Abbe Number of a glass are typically used by designers as degrees of freedom when designing systems. Many glass manufacturers offer the same material characteristics under different trade names.

Glass name	Index of Refraction	Abbe Number	Density	Coefficient of Linear Expansion
Fused Silica	1.458	67.70	2.20	0.55
Schott BoroFloat	1.472	65.70	2.20	3.25
Corning Pyrex 7740	1.474	65.40	2.23	3.20
BK7	1.517	64.20	2.46	7.10
K5	1.522	59.50	2.59	8.20
B270	1.523	58.50	2.55	8.20
SK11	1.546	60.80	3.08	6.50
BaK4	1.569	56.10	2.85	7.00
SSKN8	1.618	49.80	3.33	7.10
F2	1.620	36.40	3.61	8.20
BaSF1	1.626	38.96	3.66	8.50
SF2	1.648	33.90	3.86	8.40
LaKN22	1.651	55.89	3.73	6.60
BaF11	1.667	48.30	3.76	6.80
BaF13	1.669	45.00	3.80	7.40
BaF10	1.670	47.20	3.76	6.80
BaFN10	1.670	47.10	3.76	6.80
SF5	1.673	32.30	4.07	8.20
SF8	1.689	31.20	4.22	8.20
SF18	1.722	29.30	4.49	8.10
SF10	1.728	28.40	4.28	7.50
FD10	1.728	28.30	4.32	7.60
SF14	1.762	26.50	4.54	6.60
Sapphire	1.768	72.70	3.97	5.30
SF11	1.758	25.80	3.41	6.20
LaSFN30	1.803	46.40	4.46	6.20
SFL6	1.805	25.39	3.37	9.00
SF6	1.805	25.40	5.18	8.10
SF57	1.847	23.80	5.51	8.30
LaSFN9	1.850	32.20	4.44	7.40