  Spiral phase contrast is an important and convenient imaging processing
technology in edge detection, and a broader field-of-view (FOV) of imaging is a
long-pursuing aim to see more regions of the illumination objects. Compared
with near-infrared (NIR) spectrum, the up-conversion imaging in visible
spectrum benefits from the advantages of higher efficiency detection and lower
potential speckle. FOV enhanced and spiral phase contrast up-conversion imaging
processing methods by using second order nonlinear frequency up-conversion from
NIR spectrum to visible spectrum in two different configurations are presented
in this work. By changing the temperature of crystal, controllable spatial
patterns of imaging with more than 4.5 times enhancement of FOV is realized in
both configurations. Additionally, we present numerical simulations of the
phenomenon, which agree well with the experimental observations. Our results
provide a very promising way in imaging processing, which may be widely used in
biomedicine, remote sensing and up-conversion monitoring.
