Elongated Laser Guide Stars - Collaborative Project Pages

Use this web page to exchange documents and share ideas on this CfAO Theme2 project.

Project Description

System Level Modeling and Optimization of the Polar Coordinate Detector Combined with Modeling and Simulation of Algorithms for Wavefront Sensing with Elongated Sodium Laser Guide Stars

This is a collaborative project designed to produce a wavefront sensor that is optimized for laser guide stars. There are two components: 1) specifying the parameters of a new wavefront sensor CCD specifically designed for extended laser guide stars, and 2) developing and analyzing optimal algorithms for laser guide wavefront sensing, with predictions anchored against experimental results at the W.M Keck Observatory and at the UCSC Laboratory for Adaptive Optics.

The CfAO Proposal:

• ElongatedLGS_AnalysisDesign.pdf: Collaborative Proposal to CfAO Theme 2

Meetings:

Workshop at UCSC, September 8, 2006

• CfAOElongatedLGSWorkshop_AgendaSept06.pdf: Workshop Agenda for September 8, 2006 meeting at UCSC

• CfAO_Presentation.ppt: Presentation by Sean Adkins on Radial CCD design issues

• OptimizationOfSHWFS_SandrineThomas_GavelNotes.ppt: Presentation by Sandrine Thomas on analytic and simulation modeling of centroiders

• Notes_from_the_Elongated_LGS_and_WFS_meeting.doc: Meeting notes

Meeting at UCSC, October 12, 2006

• ToDoList

• Meeting_061012.doc: To Do List from today's meeting

Related Papers and Memos:

• Adkins, Azucena, and Nelson, The design and optimization of detectors for adaptive optics wavefront sensing, SPIE 6272, June, 2006. PDF Library Card.

• Adkins, A Polar Coordinate Detector for LGS AO, January, 2006 PDF

• Adkins, Next Generation Optical Detectors for Wavefront Sensing: Imager Clocks for the Phase 2 CCD Design1, January, 2006 PDF

• L.Gilles and B.L. Ellerbroek, Shack-Hartmann wavefront sensing with elongated sodium laser beacons: centroiding versus matched filtering, Appl. Opt. (2006).

• L. Gilles, B.L. Ellerbroek and J.-P. Veran, Laser guide star multi-conjugate adaptive optics performance of the Thirty Meter Telescope with elongated sodium beacons and matched filtering, Proc. SPIE, Advances in Adaptive Optics II, Orlando (2006).

• S. Thomas, T. Fusco, A. Tokovinin, M. Nicolle, V. Michau, G. Rousset, Comparison of centroid computation algorithms in a Shack–Hartmann sensor, Monthly Notices of the Royal Astronomical Society, Volume 371, Issue 1, Page 323-336, Sep 2006. ...external link to PDF...Library Card.

• S. Thomas, Optimized Centroid Computing in a Shack-Hartmann Sensor, Proc. SPIE, V. 5490, pp. 1238-1246, 2004.

• S. Thomas, Etude d'une optique adaptative pour l'astronomie dans le visible, Thesis (Docteur en Sciences), l'universite de Nice-Sophia Antipolis, 2005. PDF (in French)

• S. Thomas, Study of an adaptive optics for the astronomy in the visible, Thesis (Docteur en Sciences), l'universite de Nice-Sophia Antipolis, 2005. English translation of the wavefront sensor technical analysis part

• elongatedLGS.gif:
  

• TimeVariabilitySodiumLayer_Gavel.pdf: Gavel, D., Time Variability of the Mesospheric Sodium Profile, Dec., 2005

• Vancouver07_01.pdf: Paper submitted to OSA for the June 2007 conference in Vancouver

• link to software for modeling elongated LGS wavefront sensors