Complete Optical Field Reconstruction Using Computer Generated Holograms

A deep insight in the physical properties of optical devices and their emerging optical beams accrues by the knowledge of the complete field information. Furthermore, the determination of the whole spectrum of beam properties like beam-propagation ratio, beam-pointing stability or wave front deviations is possible. For the description of the entire optical field a complete set of orthogonal transversal modes is commonly used caused by the reduction of the entire field information down to a few modal coefficients. Therefore, we present a field reconstruction procedure based on model decomposition by using computer generated holograms as optical correlation filter. The presented technique provides modally resolved information about the power spectrum, the polarization state and the phase delay of the investigated beam. This enables us to reconstruct the full spatial field distribution concerning amplitude, phase and polarization. We present the application of this field reconstruction technique on optical multimode beams emerging from passive step-index large mode area fibers.