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Home > Products > Sapphire Rods > Sapphire Tapered Rods
Sapphire Tapered Rods

Standard sapphire cylindrical rod with a conical / tapered end. The tapered surface is a conical or a flat tapered. It can be polished or ground.


Vanrun OE provides a variety of customized precise tapered sapphire rods. There are following types:

All surfaces polished sapphire rod

Only two ends polished sapphire rod

Conical tapered rod

Flat tapered rod

Common specifications of sapphire tapered rods: (conical, cone rod)

Material:

CZ, KY, HEM monocrystal sapphire, C-cut or random 

Diameter Range:

Dia. 5mm to 20mm

Diameter Tolerance:

+/-0.02mm, +/-0.05mm

Length Range:

10mm to 100mm

Length Tolerance:

+/-0.05mm, +/-0.1mm

Tapered Diameter:tapered small end from 0.5mm up to the diameter of rod, tolerance +/-0.1mm
Tapered Length:30% to 90% of the length of rods, tolerance +/-0.2mm, customized

Surface Quality:

20-10, 40-20, 60-40 (MIL13830) for polished ends, 60-40, 80-50 for polished cylindrical surface

Surface Accuracy:

up to 1/4 lambda @633nm for two ends

Chamfer:

protective, 0.2 to 0.5x45 Degree, ground or polished

Coating:

no coating or AR coating of end surface

Proterties of sapphire crystal:
Physical and optical proterties

Transimission Range0.17 to 5.5um
Refractive IndexNo 1.75449; Ne 1.74663 @ 1.06um
Reflection Loss14% @ 1.06um
Absorption Coefficient0.3 x 10-3cm-1 @2.4um
Reststrahlen Peak13.5um
dn/dT13.1x10-6 @ 0.546um
dn/du = 01.5 um
Density3.97 g/cc
Melting Point2040 
Thermal Conductivity27.21 W m-1 K-1 @ 300K
Thermal Expansion5.6 (para) & 5.0 (perp) x 10-6/K
HardnessKnoop 2000 with 2000g indenter
Specific Heat Capacity763 J Kg-1 K-1 @ 293K
Dielectric Constant11.5 (para) 9.4 (perp) @ 1MHz
Youngs Modulus (E)335 GPa
Shear Modulus (G)148.1 GPa
Bulk Modulus (K)240 GPa
Elastic CoefficientsC11=496 C12=164 C13=115 C33=498 C44=148
Apparent Elastic Limit300MPa （45,000 psi)
Poisson Ratio0.25
Solubility98x10-6g/100g water
Molecular Weight101.96
Class/StructureTrigonal (hex), R3c