The measurable photocurrent is much larger for an APD when compared to a PIN detector. The SAR500-Series of APDs is based on a reach through structure for high sensitivity across the range 100-1100nm and features very fast response times as well as extremely low noise and dark current levels. The diameter of the active area of the SAR500S2 is 500 microns and the device are manufactured in a standard TO-46 can which is hermetically sealed. These devices have long expected lifetimes making them suitable for applications such as range finding, LiDAR, spectroscopy and fluorescence.
Laser Components - www.lasercomponents.com