Patent ID: 8988779
Filing Date: 2015-03-24
Classification: G02B

Abstract:
1. An optical system for combining a plurality of light beams along a single light path, comprising: a first source of collimated light; a first bandpass filter positioned in the path of light from said first light source, the distal surface of said first filter being reflective to light frequencies outside the bandpass range of said first filter, such that light from said first light source passes through said first filter at an angle θ, where said angle θ is between 15 and 25 degrees; a second source of collimated light; and a second filter positioned in the path of light from said second light source, such that light from said second light source passes through said second filter; wherein said first filter is positioned such that light from said second light source is incident on said distal surface substantially at the location at which light from said first light source passes through said first filter, and such said incident light from said second light source is reflected at said angle θ, whereby light from said first and second light sources are combined into a single beam.