Single-shot curvature sensing with non-coaxial Fibonacci-sieve filter in telescope

Wavefront curvature sensing is considered a promising method for measuring wavefront aberrations, which has widespread applications ranging from adaptive optics to optical testing. Here, a single-shot curvature sensing with a noncoaxial Fibonacci-sieve filter in the telescope was proposed to reconstruct the wavefront distribution of tiny transmissive objects fabricated on a chrome plate. A noncoaxial Fibonacci-sieve filter in the telescope was designed to realize simultaneously triplanar diffraction patterns at a recording plane; thus, the wavefront can be quantitatively retrieved by a single exposure. A trifocal Fibonacci sieve was fabricated, and its feasibility was verified in the optical region experimentally. With the advantages of simple operation in real-time and reducing the effects of vibration, this method makes it possible to be applied to various imaging and detection techniques, especially for biological imaging and wavefront detection.