Appendix 4.6.a Ground Conjugate, Wide Field Adaptive Optics for the Elt’s

Appendix 4.6.d a Wave Optics Propagation Code for Multi-conjugate Adaptive Optics

Appendix 4.6.c a Multigrid Preconditioned Conjugate Gradient Method for Large Scale Wavefront Construction

We introduce a multigrid preconditioned conjugate gradient (MGCG) iterative scheme for computing open loop wavefront reconstructors in the adaptive optics (AO) system of large telescopes. We present numerical simulations which indicate that our MGCG method has a rapid convergence rate for a wide range of sub-aperture gradient measurement signal-to-noise ratios. The cost per iteration is order N...

Ground-Conjugate Wide Field Adaptive Optics for the ELTs

Ground-conjugate wide eld AO is presented and preliminary performance results are given, which show that signi cant seeing improvement can be achieved over 10-20 arcmin eld of view. A proposal for an ELT AO system is sketched.

Scaled Atmospheric Blooming Experiments (SABLE)

II The SABLE field experiments investigated the use of phase-conjugate adaptive optics to compensate for strong thermal blooming and turbulence. The experiments, conducted at the TRW Capistrano Test Site in southern California over horizontal paths of 100 and 400 m, were designed to explore issues related to the propagation ofhigh-power lasers from the ground to space. The laser used in the exp...

Profiles of the daytime atmospheric turbulence above Big Bear solar observatory

Context. Space weather has become acutely critical for today’s global communication networks. To understand its driving forces we need to observe the Sun with high angular-resolution, and within large fields-of-view, i.e. with multi-conjugate adaptive optics correction. Aims. The design of a multi-conjugate adaptive optical system requires the knowledge of the altitude distribution of atmospher...