WHAT IS RPP ?
The focusing of the laser is very important parameter as it is directly proportional to the resolution one can attain for machine vision applications. It is important to note the relationship between focus and depth of focus, the tighter the beam size at focus that can be attained the smaller the depth of focus. Depth of focus is defined as the distance where the beam size remains within 1.4 times its minimum.
At Osela we provide many different focusing options giving you the flexibility to choose the one that best suits your application. The RPP laser is focusable by the user without removing the RPP optic. From the graphs below note the beam size and Depth of Focus (DOF) values and then multiply by the K constants for the laser diode model and focus option of choice.
Example: From the graphs at 400 mm working distance, Focus = 140μm, DOF = 36 mm. Then for Laser Model 660 nm 130 mW the beam at focus for OPTION A will be an ellipse having a dimension of 212.8 by 299.6 um (i.e.140 um x 1.52, 140 um x 2.14). Its Depth of focus will be 88.92mm by 177.12 mm (i.e. 36mm x 2.47, 36mm x 4.92) respectively. Also note the beam size and depth of focus is noted for the center beam only.