MEMS compatible micro-GRIN lenses for fiber to chip ...
2007-4-22 · 2.2. Micro-GRIN lenses as optical collimators The furthermost usage of micro-lenses on a chip is light collimation. In order to have larger free space coupling lengths the incoming beam waist has to be broadened. A broader beam waist has a smaller divergence angle, 0 (0 = / 0) therefore, a double diameter yields a four