Shanghai Dream Lasers Technology - DPSS Green, Blue & Red Lasers, Precision Optics and Crystals

Optical Specifications

Optical Materials

Achromatic Lenses

Spherical Lenses

Cylindrical Lenses

Prisms

Penta Prisms

Corner Cube Retroreflector

Waveplate

Beamsplitters

Filters

Coating

Cleaning Optics

Introduction	Material Table	BK7	UV Grade Fused Silica	SF11	BaK1
LaSFN9	Optical Crown Glass	F2	Borosilicate Glass (LEBG)	Sapphire	CaF2

Optical Crown Glass

In optical crown glass, a low-index commercial-grade glass, the index of refraction, transmittance, and homogeneity are not controlled as carefully as they are in optical-grade glasses such as BK7. Optical crown is suitable for applications in which component tolerances are fairly loose and as a substrate material for mirrors.

Optical Crown Glass Constants Constants
Abbé Constant	58.5
Dispersion	(n_F - n_C) = 0.0089
Density	2.55 g/cm^-3
Young's Modulus	7.15 x 10⁹ dynes/mm²
Poisson's Ratio	0.235
Specific Heat Cp (20° to 100°C)	0.184 cal/g-°C
Coefficient of Linear Expansion (20° to 300°C)	9.3 x 10^-6/°C
Stress Birefringence, (Yellow Light)	10 nm/cm
Melt-to-Melt Mean Index Tolerance	±0.001
Transformation Temperature	521°C
Softening Point	708°C

Transmittance characteristics for optical crown are shown the figure below.

External transmittance for 10-mm-thick uncoated optical crown glass