INGOT WFS for LGSs: First Results from Simulations

The Ingot WFS ON an ELT-like telescope: the project and simulations

The Ingot WFS represents an innovative and indispensable class of sensors conceived to overcome some limitations due to the LGSs geometry, which is significantly different from the point-object originated by a NGS. Here we overview the project, aiming at investigating the performance of an ELT-like telescope equipped with the Ingot WFS, facing different aspects of the program: the needs for numerical simulations and laboratory experiments, the prototype and, finally the future plan for the verification on sky.

Laboratory testing of the Ingot WFS

The ingot WFS is a new kind of wavefront sensor specifically designed to deal with the elongation of LGS reference sources on ELT-class telescopes. Like the pyramid, it belongs to the family of pupil plane wavefront sensors and can be considered as a generalization of the pyramid WFS for extended, three-dimensional elongated sources. The current design uses a simple, reflective roof-shaped prism to split the light into three pupils that are used to retrieve the wavefront shape. A test-bench has been realized at the INAF-Padova laboratories to test the alignment and functioning of the ingot. Th…

INGOT Wavefront Sensor: Simulation of Pupil Images

The ingot wavefront sensor (I-WFS) has been proposed, for ELT-like apertures, as a possible pupil plane WFS, to cope with the geometrical characteristics of a laser guide star (LGS). Within the study and development of such a WFS, on-going in the framework of the MAORY project, the final purpose of the I-WFS simulation is to estimate its performance in terms of wavefront aberration measurement capability. The first step of this analysis is to translate incoming wavefronts into the three pupil images, produced by the optical system. The intrinsic geometrical characteristics of the ingot optical…

Ingot WFS实验室测试的新进展

New developments on the Ingot WFS laboratory testing

针对传统波前传感器处理钠LGS的难题，研究团队对适用于甚大望远镜的Ingot WFS开展实验室测试，总结新搜索算法测试结果，并通过模拟时变钠层剖面研究其对锭型光瞳信号的影响。

用于巨型望远镜激光导星系统的瞳面波前传感器：Ingot 案例研究

Pupil plane WFSs for LGS systems of giant telescopes: the case of Ingot

本研究介绍了用于巨型望远镜钠激光导星系统的Ingot瞳面波前传感器，其利用沙伊姆弗勒原理感知拉长时变光源的三维体积以优化自适应光学性能，同时分析了其设计动因、配置方案、与其他方法的比较及项目进展。

Pupil plane wavefront sensing for extended and 3D sources

The basic outline of a pupil plane WaveFront Sensor is reviewed taking into account that the source to be sensed could be different from an unresolved source, i.e. it is extended, and that it could deploy also in a 3D fashion, enough to exceed the field's depth of the observing telescope. Under these conditions it is pointed out that the features of the reference are not invariant for different position on the pupil and it is shown that the INGOT WFS is the equivalent of the Pyramid for a Laser Guide Star. Under these conditions one can imagine to use a Dark WFS approach to improve the SNR of …