Inter-mode interferometry for resolution enhancement of common-path OAM-basis wavefront single-pixel imaging

Wavefront single-pixel imaging (WSPI) allows the development of imaging systems where pixel-array detectors are immature or even unavailable. However, the state-of-the-art common-path interference-based WSPI methods generally sacrifice the pixels of the spatial light modulator (SLM) to introduce the reference light reducing the imaging resolution. Here, we propose to use inter-mode common-path interferometry to improve the spatial resolution of orbital angular momentum basis wavefront single-pixel imaging (OAM-WSPI), since the inter-mode interferometry does not sacrifice the pixels of the SLM to introduce reference light. Experimental demonstrations suggest the feasibility and effectiveness of the proposed method. Such a method has potential applications in the fields of high-resolution holography applications, in which OAM beams need to be used.