The SV60 stress viewer is a medium aperture test device for checking stress in visually transparent optical components, especially those made using ZnSe. Stress from physical damage, incorrect mounting and high intensity radiation can cause non-reversible stress in the lens material. Stress shows up as birefringence, which can be seen when the component is viewed between two crossed polarizers and illuminated with visible light. Stress birefringence reduces the performance of an optic.

Lenses that are stressed by the mount may spring back when removed from the mount. In this situation small permanent stress crosses will be visible around the lens edge indicating that the lens was under severe stress when mounted.

The SV60 illuminates the test lens from below and is viewed through a magnifying lens which provides greater details of the stress. An opal screen below the lower polarizer provides uniform lighting. The SV60 is supplied with a 1.5 and a 2.0 lens holder. Mounted lenses can also be viewed.

Dimensions245 mm x 100 mm x 120 mm (HxWxD)
ConstructionAluminum alloy, black anodized
Aperture60 mm diameter
Power Supply240 V or 110 V, must be specified upon ordering
PolarizersLower is fixed
Upper rotates
DiffuserOpal screen below lower polarizer


ULO Optics is an ISO certified company and quality is at the heart of everything we do.  With a host of industrial affiliations you can rely on ULO to deliver.

Diversification into 1 micron optics

ULO Collaborate on the LaserSnake2 project, developing laser cutting optics for safe, remote cutting in air and in water, focused on nuclear decommissioning.