Implementation of an adaptive-optics assisted isoSTED nanoscope.

An adaptive-optics assisted isoSTED (4Pi-STED) nanoscope can be built and aligned to deliver isotropic sub-50-nm 3D imaging in thick samples up to 35 µm.

• Why it matters: High 3D STED performance depends on precise 4Pi alignment, but building and calibrating such systems is complex and not well standardized for new labs.
• What they did: The authors provide a step-by-step construction and alignment protocol, including optomechanics, electronics/control setup, beam-path alignment, and performance assessment, targeting completion in about 12 months.
• The result: After fine calibration, the instrument is expected to produce isotropic sub-50-nm resolution 3D biological images in samples with depth ≤35 µm, enabling imaging in thicker specimens.

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