Coherent addition of AlGaAs lasers using microlenses and diffractive coupling

Leger, James R.; Scott, Miles L.; Veldkamp, Wilfrid B.
May 1988
Applied Physics Letters;5/23/1988, Vol. 52 Issue 21, p1771
Academic Journal
A near single-lobed far-field pattern was obtained from coherent operation of a nonevanescently coupled AlGaAs laser diode array. A diffractive microlens array collimated the individual beams to approximate a plane wave, and diffractive coupling from an external cavity mirror provided mutual coherence. A diffraction-limited far-field pattern was observed with 82% of the power contained in the central lobe. The method is directly applicable to two-dimensional laser arrays and can be implemented as a single thin optical element.


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