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Femtosecond laser fabrication of controlled three dimensional structures deep in the bulk of diamond is facilitated by a dual adaptive optics system. A deformable mirror is used in parallel with a liquid crystal spatial light modulator to compensate the extreme aberrations caused by the refractive index mismatch between the diamond and the objective immersion medium. It is shown that aberration compensation is essential for the generation of controlled micron-scale features at depths greater than 200 μm, and the dual adaptive optics approach demonstrates increased fabrication efficiency relative to experiments using a single adaptive element.

Type

Journal article

Journal

Opt Express

Publication Date

21/11/2011

Volume

19

Pages

24122 - 24128

Keywords

Diamond, Equipment Design, Equipment Failure Analysis, Feedback, Lasers, Lenses, Refractometry