Analysis of iterative phase retrieval approach to optimize amplitude measurement parameters

Abstract

Abstract-This paper describes a thorough analysis made with the Iterative Error-Reduction Approach (IERA) for the determination of phase profiles of the output microwave beam of a gyrotron from known amplitudes. Based on theoretical field profiles of 170GHz/2MW coaxial gyrotron, a numerical/statistical approach is used to study the accuracy of Iterative phase retrieval algorithm. Several measurement parameters are optimized to get more accuracy during the infrared measurements of intensity thermograms of the microwave beam.

Output System for a 170-GHz/1.5-MW Continuous Wave Gyrotron Operating in the TE28,12Mode

“…Replaceà 2 with the simulated amplitude A 2 of plane 2, back propagate it to the plane 1 using same propagator. Replace the computed amplitudeà 1 with measured amplitude A 1 at plane 1, repeat the above process until the error reaches to the required threshold [22]- [24]. Fig.…”