Image with Single Lens Beam Expander
Image with Concave Single Lens Couple to Single-Mode Fiber
Focusing a Collimated Beam Spatial Filter Pinhole
Collimating a Beam From a Point Source Return to Newport Online Catalog
   
 
Note:

Choose an objective closest to the calculated f, whether larger or smaller than the result shown. For best results, please choose a plano-convex lens or a microscope objective.

Inputs:
d: beam diameter
: wavelength
D: fiber mode field diameter
Output:
f: focal length

See Spherical Lenses  See Objective Lenses