We demonstrate a method with which to calibrate a Shack–Hartmann sensor for absolute wavefront measurement of collimated laser beams. Nearly perfect spherical wavefronts originating from a single-mode fiber were used as references. After the calibration, the uncertainty of the wavefront was less than λ/100 peak to valley across a diameter of 6mm. For example, this method allowed us to balance aberrations and prepare collimated beams with wavefronts that are plane to λ/500 across 1mm.
© 2005 Optical Society of America
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
Instrumentation, Measurement, and Metrology
Alexander Chernyshov, Uwe Sterr, Fritz Riehle, Jürgen Helmcke, and Johannes Pfund, "Calibration of a Shack–Hartmann sensor for absolute measurements of wavefronts," Appl. Opt. 44, 6419-6425 (2005)