Adaptive central moment descent for broadband scattered light manipulation

Wavefront shaping enables precise control of light propagation through scattering media by utilizing the knowledge of the scattering matrix. However, in many imaging applications where broadband light is employed, reduced speckle contrast and strong background signals significantly impair the performance of conventional phase retrieval methods. To overcome this limitation, we introduce an adaptive central moment descent (ACMD) method, which enhances speckle contrast via high-order central moment processing. Experimental results using scattered femtosecond pulses and their second-harmonic signals demonstrate that ACMD consistently outperforms conventional methods across various scattering scenarios, achieving accurate matrix reconstruction and precise wavefront control.