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The classic Hartmann test consists of an array of holes to reconstruct thewavefront from the local deviation of each focal spot, and Shack-Hartmannsensor improved that with an array of microlenses. This array of microlensesimposes practical limitations when the wavefront is not into of visiblewavelengths, e.g., the fabrication of these. Instead, we propose awavefront-sensing technique using an array of circular obstructions, i.e., theHartmann sensor with an inverted Hartmann array. We show that under the sameconditions the inverted Hartmann sensor and the Shack-Hartmann wavefront sensorhave an equivalent spot-map to recover the wavefront. The method might used innon-visible wavelengths and in a wider range of applications.

Wavefront sensing based on the inverted Hartmann sensor