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Fabrication of microlenses by laser-assisted chemical etching

The laser assisted chemical etching technique (LACE) is capable of generating high quality aspheric microlenses, as well as other miniature components such as prisms and waveguides. Using a calculated intensity map it is possible to individually specify the optical properties of each element in the array. To date, arrays of high quality lenslets have been fabricated with specifications ranging from f/0.7 to f/10 with spacing of 50 to 300 (mu) . Microlenses have been generated in glass, silicon, CdTe and sapphire having 95 fill factors with figure quality better than 1/10th wave.