Overview of IS-1-2W 1"inner diameter integrating sphere photodiode laser measurement sensor:

The IS-1-2W is a calibrated 1” internal diameter integrating sphere photodiode laser measurement sensor. It is used for measuring divergent beams up to +/-50 degrees, especially from fibers. It has a 5mm aperture and can measure from 500nW to 2W. It covers the spectral range from 0.22 to 1.1μm. The sensor comes with a 1.5 meter cable for connecting to a meter or PC interface.

IS-1-2W sensor drawing:

Main parameters:

Problem summary:

How do they work with integrating spheres when there are divergent light sources?

When there is a divergent light source, the integrating sphere is used. The inner surface of the integrating sphere is coated with a highly reflective (usually 99%) surface in a scattering, non mirror way. Therefore, when the divergent beam hits the integrating sphere wall, the light will be reflected and scattered many times until the light hitting anywhere on the sphere wall has the same intensity. The detector placed in the sphere has the same intensity as anywhere else, and the power detected by the detector is proportional to the total incident power independent of the beam divergence. (The detector is arranged so that it can only see the scattered light but not the incident beam). The ideal integrating sphere surface has Lambert reflection characteristics.