Advanced Multi-Mode Phase Retrieval For Dispersion Scan

TL;DR

This paper introduces a novel phase retrieval algorithm for dispersion scan that can simultaneously characterize multiple incoherent ultrafast pulses using a single trace, employing a Newton's method approach for improved accuracy.

Contribution

The paper presents a new multi-mode phase retrieval algorithm for d-scan that handles multiple incoherent pulses and addresses the square root problem with Newton's method.

Findings

Accurately retrieves phases of single and multi-mode pulses.

Demonstrates robustness through simulated and experimental data.

Effectively characterizes multiple pulses from a single trace.

Abstract

We present a phase retrieval algorithm for dispersion scan (d-scan), inspired by ptychography, which is capable of characterizing multiple mutually-incoherent ultrafast pulses (or modes) in a pulse train simultaneously from a single d-scan trace. In addition, a form of Newton's method is employed as a solution to the square root problem commonly encountered in second harmonic pulse measurement techniques. Simulated and experimental phase retrievals of both single-mode and multi-mode d-scan traces are shown to demonstrate the accuracy and robustness of the algorithm.