crystaltechno : crystal optics manufacturer


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Full Spectrum Grade Synthetic Fused Silica (KV)

Fused silica is the glassy form of quartz and is thus isotropic. It is tough and hard and has a very low expansion. Normal varieties contain water which gives strong absorption in the IR. Water-free varieties are available.


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE


	Refractive Index	n_F (486nm) = 1.4632; n_d (588nm) = 1.4586; n_C (656nm) = 1.4565
		for two surfaces at 400nm – 7.0%; at 588nm – 6.8%;
	Index of Absorption	10 x 10^-6 cm-1 at 1 microns
	dN/dT	+11.9 X 10^-6/°C
	dN/dµ = 0	1.3µm
	Birefringence Constant	3.61 nm/cm
	Abbe Constant	67.6
	Fluorescence	Upon excitation at 242 nm the material displays blue fluorescence.
	Impurity Content	Total metallic impurities: 25 - 30 ppm
	OH^- Content	400 - 500 ppm
	Density	2.203 g/cm³
	Thermal Conductivity	1.38 Wm^-1K^-1
	Specific Heat Capacity	703 J Kg^-1K^-1
	Coefficient of Expansion	0.55 x 10^-6 /^oC
	Softening Point	1730^oC (3146^oF)
	Annealing Point	1180^oC (2156^oF)
	Strain Point	1075^oC (1967^oF)
	Max. Service Temperature	1150^oC (2102^oF) - continuous, 1300^oC (2372^oF) - limited time
	Dielectric Constant	3.91 at 1kHz
	Dielectric Strength	250-400 kV/cm at 20^oC
	Young's Modulus	73 GPa at 25^oC
	Shear Modulus	31 GPa at 25^oC
	Rupture Modulus	50 MPa at 25^oC
	Bulk Modulus	36.9 GPa at 25^oC
	Poisson Ratio	0.17 at 25^oC
	Knoop Hardness	500 kg/mm²
	Compressive Strength	1.1 GPa
	Tensile Strength	50 MPa
	Apparent Elastic Limit	55MPa (7980 psi)
	Molecular Weight	28.09
	Class/Structure	Amorphous glass
	Chemical Stability	High resistance to water and acids (except hydrofluoric).


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

The following products from FS are available:

  WINDOWS

  BLANKS

  LENSES

  PRISMS