Highly precise f/0.9 refractive anamorphic microlenses have been fabricated in GaP substrates by mass‐transport smoothing of etched multiple‐mesa structures. Astigmatic outputs from tapered unstable‐resonator lasers have been collimated to a nearly round beam of near diffraction‐limited 0.43° divergence. Initial good efficiencies (as high as 35%) have been obtained in coupling the laser output into a single‐mode fiber. These lenses are highly promising for realizing simple compact optical systems that exploit the high power capability of tapered lasers.
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