Publications in Refereed Journals

2013

‘Modeling and validation of polishing tool influence functions for manufacturing segments for extremely large telescopes’, H. Li, D. Walker, G. Yu, W. Zhang, Applied Optics, Vol. 52, Issue 23, pp. 5781-5787 (2013)

‘Edge control in CNC polishing, Paper 2: simulation and validation of tool influence functions on edges’, H. Li, D. Walker, G. Yu, A. Sayle, W. Messelink, R. Evans, A. Beaucamp, Optics Express, Vol. 21, Issue 1, pp. 370-381 (2013) 

2012

‘Implementing Grolishing Process in Zeeko IRP Machines’, G. Yu,D. Walker and H. Li, Applied Optics, Vol. 51, Issue 27, pp. 6637-6640 (2012).

‘Edges in CNC polishing: from mirror-segments towards semiconductors, paper 1: edges on processing the global surface’, David Walker, Guoyu Yu, Hongyu Li, Wilhelmus Messelink, Rob Evans, and Anthony Beaucamp, Optics Express, Vol. 20, Issue 18, pp. 19787-19798 (2012)

2011

‘Modeling and Measurement of Polishing Tool Influence Functions for Edge Control’, H. Li, G. Yu, D. Walker, R. Evans, J. Eur. Opt. Soc. – Rapid Publications 6, 11044, 2011

‘Removal of Mid Spatial Frequency Features in Mirror Segments’, G. Yu, H. Li, D. Walker, JEOS – Rapid Publications 6, 1103, pp1-4

‘Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments’, Ci Song, David Walker, Guoyu Yu,  Opt. Eng. 50, 073401 (Jul 06, 2011); doi:10.1117/1.3597328

2010

‘Simulation and validation of a prototype swing arm profilometer for measuring extremely large telescope mirror-segments’, Hongwei Jing, Christopher King, and David Walker, Opt. Express 18, 2036-2048 (2010)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-3-2036

  ‘Measurement of influence function using swing arm profilometer and laser tracker’, Hongwei Jing, Christopher King, and David Walker, Opt. Express 18, 5271-5281 (2010)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-5-5271

2008

‘Pseudo-random tool paths for CNC sub-aperture polishing and other applications’, Christina R. Dunn, David D. Walker, Optics Express, published by Optical Society of America on http://www.opticsexpress.org/, Vol. 16 Issue 23, 2008, pp.18942-18949

2007

“Subsurface damage in precision ground ULE (R) and Zerodur (R) surfaces”, X. Tonnellier, P. Morantz, P. Shore, A. Baldwin, R. Evans, D. Walker, Opt. Express, Vol 15, 12197-12205 (2007).

2006

‘Use of the ‘Precessions’process for pre-polishing and correcting 2D & 2½D form’, David D. Walker,

Richard Freeman, Roger Morton, Gerry McCavana, Anthony Beaucamp, Optics Express, ISSN: 1094-4087, Published by Optical Society of America on http://www.opticsexpress.org/, Vol. 14, issue 24, 2006, pp. 11787-11795

2005

‘Matching Manufacturing and Measurements-solutions for Free-Form Surfaces’, D.D. Walker, M.  Hutchinson, Euspen conference, Montpellier, France, May 9-12 2005, P28, Proceedings of the VisionOnline Seminar ‘Ultra Precision Optics- Meeting the Manufacturing Challenge & The Metrology of Advanced Optics’, May 2005.

Other Publications

2013

‘Faster production of high-quality telescope mirrors’, D. Walker, SPIE Newsroom article, April, download from   http://spie.org/documents/Newsroom/Imported/004794/004794_10.pdf

2012

‘Edge-control and surface-smoothness in sub-aperture  polishing of mirror segments’, D. Walker, A. Beaucamp, R. Evans, T. Fox-Leonard, N. Fairhurst, C. Gray , S. Hamidi, H. Li, W. Messalink, J. Mitchell, P. Rees, G. Yu,  Proc. SPIE Astronomical telescopes and Instrumentation, Amsterdam, 2012

Review of proposal for a new book, ‘Manufacturing and Measurement of Large and Middle-scale Aperture Aspheric Surfaces’, author Professor Shengyi li, for John Wiley & Sons Ltd

2011

‘Technologies for producing segments for extremely large telescopes’, D. Walker, I. Baker, R. Evans, S. Hamidi, P. Harris, H. Li, W. Messelink, J. Mitchell, M. Parry-Jones, P. Rees, G. Yu, proceedings of Optical Manufacturing and Testing IX conference, San Diego, Pub. SPIE

‘Progress on precise grinding and polishing of thin glass monolithic shell (towards WFXT)’, O. Citterio, M. M. Civitani, J. Arnold, S. Campana, H. Combrinck, P. Conconi, V. Cotroneo, R. Freeman, E. Mattaini, R. Morton, G. Motta, G. Pareschi, G. Parodi, L. Proserpio, S. Schuler, P. Simpson, G. Tagliaferri, D. Walker, proceedings of Optical Manufacturing and Testing IX conference, San Diego, Pub. SPIE

‘Nanotechnology at the Large Scale in Wales – Optics Meets Photonics’D. Walker, Proc. Welsh Opto-Electronics Forum meeting, ‘Celebration of Photonics in Wales, P1

‘Shortage of Rare Earths’
D. Walker, Science in Parliament, Vol 68 No 2 Whitsun 2011, P17

2010

‘Alignment and arm length measurement of the Swing Arm Profilometer using a laser tracker’, Hongwei Jing, Christopher King, and David Walker, AOMATT2010, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, Dalian,China, April 26th-29th, Published SPIE, Vol. 7656

‘The Large Optics Opportunity in the UK – an Update’

D. Walker, Public Service Review: Devolved Government, Issue 20, p12,13, published PSCA International Ltd,  ISSN 1470-5257
http://edition.pagesuite-professional.co.uk/Launch.aspx?EID=c7a1c804-f561-42d2-bf55-ca0f19914c8b

‘Optics at the Large Scale: An Opportunity for the UK’

D. Walker, Public Service Review: Devolved Government, Issue 19, p14,15, published PSCA International Ltd,   ISSN 1470-5257
http://edition.pagesuite-professional.co.uk/Launch.aspx?EID=7cc50ac5-f62b-4d1a-8b0a-a1e2e1cd82a8

2008

‘Active Control of Edges and Global Microstructure on Segmented Mirrors’

D.D. Walker, A. Beaucamp, C. Dunn, R. Evans, R. Freeman, R. Morton, X. Wei, G. Yu, proceedings of Astronomical Telescopes and Instrumentation Conference, Marseille, 2008, pub. SPIE Vol. 7018

C. R. Dunn, D. D. Walker, A. Beaucamp, J. Kelchner, R. Freeman, "Improving Surface PSD Using a Random Tool Path", Optical Fabrication and Testing, OSA Technical Digest (CD) (2008).

‘Removal of diamond-turning signatures on x-ray mandrels and metal optics by fluid-jet polishing’

A. Beaucamp, R. Freeman, R. Morton, Karthik Ponudurai, D.D. Walker, proceedings of Astronomical Telescopes and Instrumentation Conference, Marseille, 2008, p35, pub. SPIE Vol. 7018

Announcement of 5M Euro contract to produce seven prototype mirror segments for the European Extremely Large Telescope, Welsh Optoelectronics Forum Newsletter, August.

X. Tonnellier, X. TonnellierP. Shore; P. Morantz; A. Baldwin; D. Walker;G. Yu; R. Evans, “Sub surface damage issues for effective fabrication of large optics”, Proc. SPIE Vol. 7018 (2008)

2007

‘A Quantitative Comparison of Three Grolishing Techniques for the Precessions TM Process’

D.D. Walker, A. Baldwin, R. Evans, R. Freeman, S. Hamidi, P. Shore, X. Tonnellier, S. Wei, C. Williams, G. Yu, Proc. SPIE Optical Manufacturing and Testing Conference, San Diego, August 28, 29 2007, pp66711H-1 to H-9

‘Manufacturing processes for free-form optics’

R. Freeman,  A.T.H. Beaucamp, G. McCavana, R. Morton, D. Riley, J. Simms a, D.D. Walker, X. Wei, Proc conference Chubu, Japan, January 

‘Metrology Software Support for Free-Form Optics Manufacturing’

A.T.H Beaucamp, R Freeman, R Morton, D.D. Walker, Proc conference Chubu, Japan, January

`The Precessions Polishing and Hybrid Grolishing Processes - Implementation in a novel 1.2m Capacity Machine Tool’

D.D. Walker, R.Evans, R. Freeman, D. Riley, G. McCavana, J. Simms, S. Wei, G. Yu Lamdamap, Cardiff, Laser Metrology and Machine Performance VIII – Lamdamap, pp 99-108

‘Subsurface damage caused during rapid grinding of Zerodur’

, Proc. ISAAT’07 International Symposium ‘Advances in Abrasive Technology X’, pp 543-549, Pub. Soc. Manuf. Engineers, Dearborn, MI, USA,

X. Tonnellier, P. Shore, P. Morantz, A.Baldwin , D.D. Walker, R. Evans

2006

‘Commissioning of the first Precessions 1.2m CNC Polishing Machines for Large Optics’,  D.D. Walker,  A.T.H. Beaucamp, V. Doubrovski, C. Dunn, R. Evans, R. Freeman,  G. McCavana, R. Morton, D. Riley, J. Simms, G. Yu, X. Wei, Proc. SPIE Vol. 6288: Current Developments in Lens Design and Optical Engineering, San Diego Aug. 2006, 62880P, pp1-8

Precessions 2½D Correction of an Aspheric Mirror’, D. Walker, A. Beaucamp, R. Freeman, R. Morton, G. McCavana, J. Kelchner, Optical Fabrication and Testing, Proc. Optical Society of America Rochester NY, October 9-11 2006, accepted for publication

‘Automated optical fabrication – First results from the new “Precessions” 1.2m CNC polishing machine’, D.D. Walker,  A.T.H. Beaucamp, V. Doubrovski, C. Dunn, R. Evans, R. Freeman, J. Kelchner, G. McCavana, R. Morton, D. Riley, J. Simms, G. Yu, X. Wei, Proc. SPIE Vol. 6273: Optomechanical Technologies for Astronomy, Orlando, pp 627309-1 to 627309-8

‘£1m Zeeko Machine Will Help OpTIC Polish Up the Opto-electronics Sector’, Welsh Optoelectronics Forum Newsletter, Jan. 2006

‘Wheel Wear and Surface/Subsurface Qualities when Precision Grinding Optical Materials’, X. Tonnellier, P. Shore, X. Luo, P. Morantz, A.Baldwin, R. Evans, D.Walker, Proc. SPIE conference Orlando, Proc. SPIE Vol. 6273, PP8-16

‘Zeeko’s Technology is Surfacing at OpTIC!’, Welsh Optoelectronics Forum Newsletter, Dec. 2006

2005

‘OpTIC Hosts New national Centre for Ultra Precision Surfaces’, Welsh Optoelectronics Forum Newsletter, October, P8

`Recent advances in the control of form and texture on free-form surfaces’ (invited paper) D.D. Walker, A.T.H. Beaucamp, V. Doubrovski, C. Dunn. R. Freeman, G. Hobbs, G. McCavana, R. Morton, D. Riley, J. Simms, X. Wei, Proc. SPIE conference ‘Optical Fabrication, Testing and Metrology II’, Jena,  Vol. 5965, 13-15 May 2005

‘New results extending the Precessions process to smoothing ground aspheres and producing freeform parts’, D. D. Walker, A. T. H. Beaucamp, V. Doubrovski, C. Dunn, R. Freeman, G. McCavana, R. Morton, D. Riley, J. Simms, X. Wei, Proc. SPIE Vol. 5869, San Diego, Aug. 2005, pp 79-87

‘New Developments  in the Precessions process for  Manufacturing Freeform, Large-optical, and Precision-mechanical  Surfaces’, D.D. Walker,  A.T.H. Beaucamp, V. Doubrovski, C. Dunn, R. Freeman, G. Hobbs, G. McCavana, R. Morton, D. Riley, J. Simms, X. Wei, Proc. 2nd International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT), plenary paper, Xian, 2005, pub SPIE Vol. 6148 pp 614805-1 to 614805-9

 ‘Zeeko 1 metre polishing system’, D. Walker, R Freeman, G Hobbs, A King, G. McCavana, R. Morton, D. Riley, J. Simms, 7th Int. Conf Lamdamap Cranfield, UK June 2005, p 240