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UnISIS: Laser Guide Star and Natural Guide Star Adaptive Optics System

机译：UnISIS：激光制导星和自然制导星自适应光学系统

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摘要

UnISIS (University of Illinois Seeing Improvement System) is a versatile adaptive optics system mounted on a large optics bench at the coude focus of the Mount Wilson 2.5-m telescope. It was designed to have both laser guide star (LGS) and natural guide star (NGS) adaptive optics capabilities. The LGS side of the system relies on a pulsed UV laser with raw power of 30 W capable of creating an artificial laser star via Rayleigh scattering 18 km above the telescope. The LGS system can work at temporal response rates as high as 333 Hz-limited by the UV laser pulse rate-and the NGS system can work at rates up to 1.4 kHz. Each side of the system has its own highspeed wavefront sensor that runs separately, but in the LGS mode the NGS wavefront sensor is converted into a natural star tip-tilt sensor. The deformable mirror is conjugate to the telescope's primary mirror and has one of the most densely packed sets of actuators of any adaptive optics system currently in operation. This paper provides details of the UnISIS design and describes key updates we have made to the system. We show NGS AO-corrected images from the sky from the 900 nm z-band through the 2.12 mu m K-s band. The highest NGS Strehl achieved to date is 0.67 at K-s band.
机译：UnISIS（伊利诺伊大学视力改善系统）是一种多功能的自适应光学系统，安装在大型光学工作台上，是威尔逊山2.5米望远镜的焦点。它的设计既具有激光制导星（LGS）和自然制导星（NGS）自适应光学功能。该系统的LGS侧依赖于30 W的原始功率的脉冲UV激光，该激光能够通过望远镜上方18 km处的瑞利散射产生人造激光星。 LGS系统可以在高达333 Hz的时间响应速率下工作，受紫外线激光脉冲速率的限制-NGS系统可以在高达1.4 kHz的速率下工作。系统的每一侧都有自己的高速波前传感器，这些传感器单独运行，但是在LGS模式下，NGS波前传感器被转换为自然的星顶倾斜传感器。可变形反射镜与望远镜的主反射镜共轭，并且具有当前运行的任何自适应光学系统中致动器最密集的一组。本文提供了UnISIS设计的详细信息，并描述了我们对系统所做的主要更新。我们显示了从900 nm z波段到2.12μm K-s波段从天空经过NGS AO校正的图像。迄今为止，在K-s波段获得的NGS Strehl最高为0.67。

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