Terahertz microscopy using laser feedback interferometry based on a generalised phase-stepping algorithm.

ABSTRACT: In this paper we report an improved method of coherent sensing through the use of a generalized phase-stepping algorithm to extract magnitude and phase information from interferometric fringes acquired by laser feedback interferometry (LFI). Our approach allows for significantly reduced optical sampling and acquisition times whilst also avoiding the need for fitting to complex models of lasers under optical feedback in post-processing. We investigate theoretically the applicability of this method under different levels of optical feedback, different laser parameters, and for different sampling conditions. We furthermore validate its use experimentally for LFI-based sensing using a terahertz (THz)-frequency laser in both far-field and near-field sensing configurations. Finally we demonstrat

SUBMITTER: Mohun D 

PROVIDER: S-EPMC10853214 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature