Description

A porous alumina ceramic of 99.7% Al₂O₃ content, used extensively for long-life laser reflectors. This material is sintered at high temperatures to achieve a controlled porosity.

 

Prime features

• Surfaces can be sealed and coated with a solarization-resistant glaze to give high bulk refectivity

• 97.8% reflectance efficiency at 1000nm

• Reflectance efficiency exceeds 96% across the wavelength range 500-2000nm (see curve)

• Controlled porosity

• Good thermal conductivity

• High electrical resistivity

 

Typical applications

Pumping chambers for Nd:YAG lasers — low to high power, single or multiple lamp designs. Pumping chamber reflectors of this material are virtually indestructible, and prove a highly cost effective alternative to metal coated types.

 

Specifications

Quality Assurance to BS EN 9001:2000

 

Production capabilities

• Components up to 250mm long and 80mm wide/diameter manufactured as standard

• Larger components manufactured to development contracts

• One-piece or split-cavity designs

• Prototype, batch and volume production.

 

Physical properties*

Color: White

Bulk density (fired), Mg/m³    :3.2

Porosity (apparent), % nominal :20

Flexural strength (ASTM C1161, 3-point), MPa :150

Thermal expansion coefficient

                 200-500C, 10^-6/C      7.9

                 200-1000C, 10^-6/C      9.0