Laser Energy Sensors measure 500 pW to 3 W light levels.

ThomasNet news

February 2, 2010 - Available in 4 models, PD300-R Circular Photodiode Sensors feature round geometry and SM-1 threads for mounting/centering on collinear optical bench systems. They include filter that minimizes light level on detector and allows for measurements up to 30 mW without saturation, while second, removable filter allows measurements up to 3 W. Low-noise energy detectors measure wavelengths up to 1,800 nm and work with all Ophir smart meters and PC interfaces.
Read the article