报告时间: 2016年5月19日（星期四）上午10:00
报告地点：南京天光所办公大楼二楼报告厅
Abstract2
Fast reflective Schmidt’s allow accurate imaging of 3o diagonal sky fields over extended ranges from far-ultraviolet to infrared. For space astronomy we present 50cm aperture designs, 3- and 4-reflection, as fast as f/2, dedicatedto the detection of extended objects. Active optics methods are presented to obtain accurately the free-form aspheric mirror by SMP. The fabrication of 20-25cm telescope model – half-scale – could start soon.
Prof. Gerard R. Lemaitre
Emeritus Professor of Aix-Marseille University at LAM
Prof. Gerard R. Lemaitre was a member of the International ESE (ELT Science & Engineering) Committee of European Southern Observatory (ESO) in 2009-2012 and other ELT-ESO’s committees that led to the five-mirror concept for the 39m European-ELT (E-ELT). In 2014-2015, he was a member the International Assessment Committee ?One-Three-Five? for the NAO of China created by CAS.In 2000, he was awarded Grand Prix André Lallemand of Astronomy by the French Academy of Sciences. Since 1967, G. Lemaitre developed active optics methods in astronomical optics by use of stress polishing and/or in-situ stressing. He elaborate the two-zone vacuum and flat -polishing method for making aspheric Schmidt refractive plates, vase form mirrors to hyperbolize Cassegrain telescope mirrors, and variable thickness distribution mirrors for generating by elastic deformation single aberrations modes such as Sphe3, Coma3, Astm3, etc. He invented Variable Curvature Mirrors (VCMs) with cycloid-like form and/or tulip form mirror thickness distributions that work by in-situ stressing and air pressure or central axial force. Such VCMs presently equip the height delay lines of the Very Large Telescope Interferometer (VLTI), at Cerro Paranal, Chile, for high angular resolution studies.
He found the analytic formulation for (all-) Reflective Schmidt designs, that is the best shape to be given the primary mirror – or the grating in a reflective spectrograph. His formula was adopted for the design of many aspherized grating spectrographs and for the LAMOST design.
G. Lemaitre wrote a book entitled Astronomical Optics and Elasticity Theory - Active Optics Methods, 600 p., Springer edt. 2009.
