Experimental validation of single-iteration multigrid wavefront reconstruction at the Palomar Observatory

Single-iteration multigrid wavefront reconstruction schemes (SIMG) were implemented and validated on the adaptive optics system at the Hale 5.1 meter telescope at the Palomar Observatory. Results indicate that even the simplest such method produces performance indistinguishable from that of the standard least-squares reconstructor for both bright and dim guide stars. SIMG provides a dramatic reduction in computational cost when compared to vector-matrix multiplication and can be implemented in parallel, making it the obvious choice for reconstruction in future large-scale adaptive optics systems.