Almost all high-contrast imaging coronagraphs proposed until now are based on passive coronagraph optical
components. Recently, Ren and Zhu proposed for the first time a coronagraph that integrates a liquid crystal array (LCA)
for the active pupil apodizing and a deformable mirror (DM) for the phase corrections. Here, for demonstration purpose,
we present the initial test result of a coronagraphic system that is based on two liquid crystal spatial light modulators
(SLM). In the system, one SLM is served as active pupil apodizing and amplitude correction to suppress the diffraction
light; another SLM is used to correct the speckle noise that is caused by the wave-front distortions. In this way, both
amplitude and phase error can be actively and efficiently compensated. In the test, we use the stochastic parallel gradient
descent (SPGD) algorithm to control two SLMs, which is based on the point spread function (PSF) sensing and
evaluation and optimized for a maximum contrast in the discovery area. Finally, it has demonstrated a contrast of 10-6 at an inner working angular distance of ~6.2 λ/D, which is a promising technique to be used for the direct imaging of young exoplanets on ground-based telescopes.
We have developed a portable solar and stellar adaptive optics (PSSAO) system, which is optimized for solar and stellar high-resolution imaging in the near infrared wavelength range. Our PSSAO features compact physical size, low cost and high performance. The AO software is based on LabVIEW programing and the mechanical and optical components are based on off-the-shelf commercial components, which make a high quality, duplicable and rapid developed AO system possible. In addition, our AO software is flexible, and can be used with different telescopes with or without central obstruction. We discuss our portable AO design philosophy, and present our recent on-site observation results. According to our knowledge, this is the first portable adaptive optics in the world that is able to work for solar and stellar high-resolution imaging with good performances.