Wavefront error budget development for the Thirty Meter Telescope laser guide star adaptive optics system

Luc Gilles; Lianqi Wang; Brent Ellerbroek

doi:10.1117/12.786971

10 July 2008 Wavefront error budget development for the Thirty Meter Telescope laser guide star adaptive optics system

Luc Gilles, Lianqi Wang, Brent Ellerbroek

Proceedings Volume 7015, Adaptive Optics Systems; 701520 (2008) https://doi.org/10.1117/12.786971
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

This paper describes the modeling effort undertaken to derive the wavefront error (WFE) budget for the Narrow Field Infrared Adaptive Optics System (NFIRAOS), which is the facility, laser guide star (LGS), dual-conjugate adaptive optics (AO) system for the Thirty Meter Telescope (TMT). The budget describes the expected performance of NFIRAOS at zenith, and has been decomposed into (i) first-order turbulence compensation terms (120 nm on-axis), (ii) opto-mechanical implementation errors (84 nm), (iii) AO component errors and higher-order effects (74 nm) and (iv) tip/tilt (TT) wavefront errors at 50% sky coverage at the galactic pole (61 nm) with natural guide star (NGS) tip/tilt/focus/astigmatism (TTFA) sensing in J band. A contingency of about 66 nm now exists to meet the observatory requirement document (ORD) total on-axis wavefront error of 187 nm, mainly on account of reduced TT errors due to updated windshake modeling and a low read-noise NGS wavefront sensor (WFS) detector. A detailed breakdown of each of these top-level terms is presented, together with a discussion on its evaluation using a mix of high-order zonal and low-order modal Monte Carlo simulations.

Citation Download Citation

Luc Gilles, Lianqi Wang, and Brent Ellerbroek "Wavefront error budget development for the Thirty Meter Telescope laser guide star adaptive optics system", Proc. SPIE 7015, Adaptive Optics Systems, 701520 (10 July 2008); https://doi.org/10.1117/12.786971

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