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2019

3.5 THz quantum-cascade laser emission from dual diagonal feedhorns

Ellison, B. N., Valavanis, A., Auriacombe, O., Gerber, D., Rawlings, T., Brewster, N., Oldfield, M. L., Han, Y., Li, L. H., Zafar, E., Linfield, E. H., Davies, A. G., Savini, G., Emes, M., Winter, B., Walker, D. & Saenz, E., 1 Nov 2019, In : International Journal of Microwave and Wireless Technologies. 11, 9, p. 909-917 9 p.

Research output: Contribution to journalArticle

Open Access
Quantum cascade lasers
Directional patterns (antenna)
Earth (planet)
Radiometers
Waveguides
2 Citations (Scopus)

Advances in Optical Fabrication for Astronomy

Walker, D., Yu, G., Li, H., Myer, B. W., Beaucamp, A. T., Namba, Y. & Wu, L., 11 May 2019, In : Monthly Notices of the Royal Astronomical Society. 485, 2, p. 2071–2082 12 p.

Research output: Contribution to journalArticle

Open Access
Astronomy
astronomy
Fabrication
fabrication
Optical design
1 Citation (Scopus)

Combined processing chain for freeform optics based on atmospheric pressure plasma processing and bonnet polishing

Su, X., Ji, P., Liu, K., Walker, D., Yu, G., Li, H., Li, D. & Wang, B., 24 Jun 2019, In : Optics Express. 27, 13, p. 17979-17992 14 p.

Research output: Contribution to journalArticle

Open Access
polishing
atmospheric pressure
optics
roughness
textures

Fully automating fine-optics manufacture - why so tough, and what are we doing?

Walker, D. D., McCluskey, T. L., Yu, G., Petrovic, S. & Li, H., 1 Dec 2019, In : Journal of the European Optical Society. 15, 1, 10 p., 24.

Research output: Contribution to journalArticle

Open Access
optics
psychology
artificial intelligence
turbine blades
automation
1 Citation (Scopus)

Fundamental steps toward next-generation intelligent automatic process in a faster and cost-effective chain for processing optical surfaces

Wu, H. Y., Walker, D. & Yu, G., 22 Jul 2019, In : Optics Express. 27, 15, p. 21856-21871 16 p.

Research output: Contribution to journalArticle

Open Access
manufacturing
telescopes
costs
textures
industries

Mid-spatial frequency removal on aluminum free-form mirror

Li, H., Walker, D. D., Zheng, X., Su, X., Wu, L., Reynolds, C., Yu, G., Li, T. & Zhang, P., 2 Sep 2019, In : Optics Express. 27, 18, p. 24885-24899 15 p.

Research output: Contribution to journalArticle

Open Access
mirrors
aluminum
polishing
saddles
robots

Rigid aspheric smoothing tool for mid-spatial frequency errors on aspheric or freeform optical surfaces

Yu, G., Wu, L., Su, X., Li, Y., Wang, K., Li, H. & Walker, D., 2 Aug 2019, In : Journal of the European Optical Society. 15, 1, 9 p., 18.

Research output: Contribution to journalArticle

Open Access
smoothing
cushions
cutters
grit
abrasives

Simulation and experimental study on form-preserving capability of bonnet polishing for complex freeform surfaces

Su, X., Ji, P., Jin, Y., Li, D., Walker, D., Yu, G., Li, H. & Wang, B., 1 Nov 2019, In : Precision Engineering. 60, p. 54-62 9 p.

Research output: Contribution to journalArticle

Polishing

Surface Texture Evolution of Fused Silica in a Combined Process of Atmospheric Pressure Plasma Processing and Bonnet Polishing

Su, X., Ji, C., Xu, Y., Li, D., Walker, D., Yu, G., Li, H. & Wang, B., 18 Oct 2019, In : Coatings. 9, 10, 13 p., 676.

Research output: Contribution to journalArticle

Open Access
Plasma applications
Fused silica
Polishing
polishing
Atmospheric pressure

Waveguide-integrated THz Quantum-Cascade Lasers for Atmospheric-Research Satellite Payloads

Valavanis, A., Auriacombe, O., Rawlings, T., Han, Y., Rea, S., Crook, M., Arena, C., Walker, D., Brooks, D., Yu, G., Li, L., Davies, A. G., Savini, G., Linfield, E. H., Ellison, B. & Saenz, E., 19 Aug 2019, 2019 IEEE MTT-S International Wireless Symposium, IWS 2019 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 3 p. 8803875

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Quantum cascade lasers
Upper atmosphere
quantum cascade lasers
payloads
Telescopes
2018
1 Citation (Scopus)

Advanced techniques for robotic polishing of aluminum mirrors

Li, H., Walker, D., Zheng, X., Yu, G., Reynolds, C., Zhang, W. & Li, T., 15 Jun 2018, Optical Fabrication, Testing, and Metrology VI. Schröder, S. & Geyl, R. (eds.). SPIE, 13 p. 106920N. (Proceedings of SPIE; vol. 10692).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Open Access
File
Polishing
robotics
Aluminum
polishing
Robotics
1 Citation (Scopus)

A Novel Hyper-Crossing Tool Path Generation Algorithm for Sub-Aperture Polishing

Reynolds, C., Walker, D., Yu, G. & Li, H., 10 Jul 2018, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. SPIE, Vol. 10706. 11 p. 107060F

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tool Path Generation
Polishing
Tool Path
polishing
apertures

Composite material evaluation at cryogenic temperatures for applications in space-based far-infrared astronomical instrumentation

Spencer, L. D., Veenendaal, I. T., Naylor, D. A., Gom, B. G., Sitwell, G. R. H., Huber, A. I., Christiansen, A., Benson, C. S., Gunuganti, S., Jones, M., Day, R., Walker, D., Zobeiry, N. & Poursartip, A., 12 Jul 2018, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. Navarro, R. & Geyl, R. (eds.). USA: SPIE, 9 p. 107063R. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 10706).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Infrared Instrumentation
Astronomical Instrumentation
cryogenic temperature
carbon fibers
Composite Materials
2017
3 Citations (Scopus)

Development of swinging part profilometer for optics

Zhang, P., Li, J., Yu, G. & Walker, D., 12 Jan 2017, In : Proceedings of SPIE - The International Society for Optical Engineering. 10151, 9 p.

Research output: Contribution to journalConference article

Open Access
profilometers
Optics
Probe
optics
Metrology
6 Citations (Scopus)

Insight into aspheric misfit with hard tools: Mapping the island of low mid-spatial frequencies

Walker, D., Hsing-Yu, W., Yu, G., Li, H., Zhang, W. & Lu, C., 13 Dec 2017, In : Applied Optics. 56, 36, p. 9925-9931 7 p.

Research output: Contribution to journalArticle

Open Access
File
aspheric optics
Polishing
Abrasives
numerical control
abrasives

Machine Acceleration Effects on Computer Controlled Polishing

Faehnle, O., Reynolds, C., Yu, G. & Walker, D., 1 Aug 2017, Optical Fabrication and Testing Conference Proceedings 2017. OSA - The Optical Society, 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polishing
Pressure distribution
Derivatives
1 Citation (Scopus)

More steps towards process automation for optical fabrication

Walker, D., Yu, G., Beaucamp, A., Bibby, M., Li, H., McCluskey, L., Petrovic, S. & Reynolds, C., 2017, Fourth European Seminar on Precision Optics Manufacturing. Fähnle, O. W., Rascher, R. & Wünsche, C. (eds.). SPIE, 8 p. 103260S. (Proceedings of SPIE; vol. 10326).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Optical Fabrication
automation
Automation
Fabrication
fabrication
1 Citation (Scopus)

Recent progress in the Elegant Breadboard supra-THz activities for LOCUS and a view to an astronomy application

Savini, G., Brooks, D., Zhu, L., Ellison, B., Auriacombe, O., Bradshaw, T., Crook, M., Gerber, D., Henry, M., Rawlings, T., Wang, H., Charlton, J., Tun, S. M., Emes, M., Hunt, T., Winter, B., Linfield, E., Davies, G., Valavanis, A., Parkes, S. & 2 others, Walker, D. & Yu, G., 7 Mar 2017, 2016 IEEE 9th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies (UCMMT). Institute of Electrical and Electronics Engineers Inc., p. 1-5 5 p. 7873956

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Astronomy
low Earth orbits
astronomy
receivers
space weather
3 Citations (Scopus)

Research on edge-control methods in CNC polishing

Yu, G., Walker, D., Li, H., Zheng, X. & Beaucamp, A., 16 Sep 2017, In : Journal of the European Optical Society. 13, 13 p., 24.

Research output: Contribution to journalArticle

Open Access
polishing
rectification
mirrors
precession
specifications
2016

Analysis of tool-mass-acceleration effects onto sub-aperture computer controlled polishing (CCP)

Faehnle, O., Yu, G. & Walker, D., 1 Jul 2016, Third European Seminar on Precision Optics Manufacturing. SPIE, Vol. 10009. 5 p. 1000903

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polishing
polishing
footprints
apertures
Ion Beam Figuring
3 Citations (Scopus)

CFRP mirror technology for cryogenic space interferometry: Review and progress to date

Jones, M. L., Walker, D., Naylor, D. A., Veenendaal, I. T. & Gom, B. G., 2016, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave. SPIE, Vol. 9904. 18 p. 99046F

Research output: Chapter in Book/Report/Conference proceedingConference contribution

carbon fiber reinforced plastics
Carbon Fiber
Carbon fiber reinforced plastics
Interferometry
Cryogenics
1 Citation (Scopus)

Closing the metrology/process loop in CNC polishing

Walker, D. D., Yu, G., Bibby, M., Li, H. & Dunn, C. R., 2016, Third European Seminar on Precision Optics Manufacturing. SPIE, Vol. 10009. 6 p. 100090O

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polishing
closing
Metrology
robots
polishing
3 Citations (Scopus)

Optimisation of grolishing freeform surfaces with rigid and semi-rigid tools

Yu, G., Wu, H. Y., Walker, D., Zheng, X., Li, H., Dunn, C. & Gray, C., 2016, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II. SPIE, Vol. 9912. 6 p. 99123Q

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Free-form Surface
optimization
Optimization
spindles
Tool Path Generation
6 Citations (Scopus)

Performance of a cryogenic test facility for 4 K interferometer delay line investigations

Veenendaal, I., Naylor, D., Gom, B., Gunuganti, S., Winter, C., Jones, M. & Walker, D., 2016, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave. SPIE, Vol. 9904. 12 p. 99045E

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Delay Line
Electric delay lines
test facilities
delay lines
Test facilities
11 Citations (Scopus)

Robotic automation in computer controlled polishing

Walker, D. D., Yu, G., Bibby, M., Dunn, C., Li, H., Wu, H. Y., Zheng, X. & Zhang, P., 6 Feb 2016, In : Journal of the European Optical Society. 11, 7 p., 16005.

Research output: Contribution to journalArticle

Open Access
automation
robotics
robots
polishing
manufacturing

The LOw Cost Upper atmosphere Sounder: The "elegant breadboard" programme

Swinyard, B., Auriacombe, O., Bradshaw, T., Brooks, D. J., Charlton, J., Crook, M., Davies, G., Ellison, B., Emes, M., Friend, J., Gerber, D., Gray, C., Henry, M., Hunt, T., Linfield, E., Navarathinam, N., Parks, S., Rawlings, T., Rea, S., Saunders, C. & 5 others, Savini, G., Tun, S. M., Walker, D., Wang, H. & Winter, B., 26 Apr 2016, 2015 8th UK, Europe, China Millimeter Waves and THz Technology Workshop, UCMMT 2015. Institute of Electrical and Electronics Engineers Inc., 4 p. 7460627

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Upper atmosphere
upper atmosphere
payloads
Acoustic waves
Environmental testing
2015
3 Citations (Scopus)

Optical and quasi-optical analysis of system components for a far-infrared space interferometer

Bracken, C., O'Sullivan, C., Donohoe, A., Murphy, A., Savini, G., Juanola-Parramon, R., Baccichet, N., Guisseau, A., Ade, P. A. R., Pascale, E., Spencer, L., Walker, I., Dohlen, K., Lightfoot, J., Holland, W., Jones, M., Walker, D. D. & McMillan, R. A., 14 Mar 2015, In : Proceedings of SPIE - The International Society for Optical Engineering. 9362, 12 p., 93620N.

Research output: Contribution to journalArticle

Interferometer
Interferometers
Infrared
interferometers
Telescopes
7 Citations (Scopus)

Progress in the Critical Assessment for a Far-Infrared Space Interferometer with Double Fourier Modulation (FP7-FISICA)

Savini, G., Ade, P. A. R., Baccichet, N., Bracken, C., Dohlenh, K., Donohoe, A., Gom, B., Griffin, J. M., Holland, W., Iafolla, V., Ivison, R. J., Jones, M., Juanola-Parramon, R., Lightfoot, J., Liu, S., McMillan, R. A., Murphy, J. A., Naylor, D., O'Sullivan, C., Pascale, E. & 12 others, Pezzutto, S., Rakotonimbahy, E., Schito, D., Spencer, L., Spinoglio, L., Swinyard, B., Venendaal, I., Vives, S., Walker, D., Leisawitz, D., Shi, S. & Matsuo, H., 2015, Fourier Transform Spectroscopy, FTS 2015. OSA - The Optical Society, FT4A.3

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Interferometers
interferometers
Modulation
Infrared radiation
modulation
13 Citations (Scopus)

The role of robotics in computer controlled polishing of large and small optics

Walker, D., Dunn, C., Yu, G., Bibby, M., Zheng, X., Wu, H. Y., Li, H. & Lu, C., 2015, Optical Manufacturing and Testing XI. Fähnle, O. W., Williamson, R. & Kim, D. W. (eds.). SPIE, 95750B. (Proceedings of SPIE; vol. 9575).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Open Access
Polishing
robotics
robots
polishing
Robotics
2014

Active edge control in the Precessions polishing process for manufacturing large mirror segments

Li, H., Zhang, W. E., Walker, D. & Yu, G., 2 Sep 2014, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes. Jiang, W., Cho, M. K. & Wu, F. (eds.). SPIE, Vol. 9280. 7 p. 928007

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polishing
precession
polishing
Mirror
Mirrors
5 Citations (Scopus)

Advanced abrasive processes for manufacturing prototype mirror segments for the world’s largest telescope

Walker, D., Davies, G., Fox-Leonard, T., Gray, C., Mitchell, J., Rees, P., Wu, H. Y., Volkov, A. & Yu, G., 2014, Advances in Abrasive Technology XVII. Trans Tech Publications Ltd, Vol. 1017. p. 532-538 7 p. (Advanced Materials Research; vol. 1017).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Open Access
Abrasives
Telescopes
Mirrors
Stray light
Polishing
4 Citations (Scopus)

Coordinate transformation of an industrial robot and its application in deterministic optical polishing

Wang, H. W., Yu, G., Xu, M. & Walker, D., 5 May 2014, In : Optical Engineering. 53, 5, 6 p., 0551026.

Research output: Contribution to journalArticle

Open Access
Industrial robots
coordinate transformations
Polishing
robots
polishing

Fusing data from multiple interferometers for the measurement of off-axis aspheres

King, C. W., Davies, G., Mitchell, J., Mitchell, P., Rees, P. & Walker, D. D., 2014, Proceedings - ASPE/ASPEN Summer Topical Meeting: Manufacture and Metrology of Freeform and Off-Axis Aspheric Surfaces. American Society for Precision Engineering, ASPE, p. 28-33 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Open Access

Interactions between manufacture and measurement of off-axis aspheres

Walker, D. D., Beaucamp, A., Bibby, M., Fox-Leonard, T., Gray, C., King, C., Rees, P. & Yu, G., 2014, Proceedings - ASPE/ASPEN Summer Topical Meeting: Manufacture and Metrology of Freeform and Off-Axis Aspheric Surfaces. American Society for Precision Engineering, ASPE, p. 72-77 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Open Access
16 Citations (Scopus)

Surface integrity of fluid jet polished tungsten carbide

Beaucamp, A., Namba, Y., Messelink, W., Walker, D., Charlton, P. & Freeman, R., 2014, In : Procedia CIRP. 13, p. 377-381 5 p.

Research output: Contribution to journalArticle

Open Access
Tungsten carbide
Polishing
Fluids
Molds
Substrates
2013
40 Citations (Scopus)

Edge control in CNC polishing, paper 2: Simulation and validation of tool influence functions on edges

Li, H., Walker, D., Yu, G., Sayle, A., Messelink, W., Evans, R. & Beaucamp, A., 14 Jan 2013, In : Optics Express. 21, 1, p. 370-381 12 p.

Research output: Contribution to journalArticle

polishing
simulation
short circuits
precession
pressure distribution
14 Citations (Scopus)

Fast manufacturing of E-ELT mirror segments using CNC polishing

Gray, C., Baker, I., Davies, G., Evans, R., Field, N., Fox-Leonard, T., Messelink, W., Mitchell, J., Rees, P., Waine, S., Walker, D. D. & Yu, G., 28 Nov 2013, Optical Manufacturing and Testing X. Vol. 8838. 88380K

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polishing
polishing
Telescopes
Optoelectronic devices
Optics
26 Citations (Scopus)

Modeling and validation of polishing tool influence functions for manufacturing segments for an extremely large telescope

Li, H., Walker, D., Yu, G. & Zhang, W., 10 Aug 2013, In : Applied Optics. 52, 23, p. 5781-5787 7 p.

Research output: Contribution to journalArticle

Polishing
polishing
Telescopes
manufacturing
telescopes
2012
6 Citations (Scopus)

Edge-control and surface-smoothness in sub-aperture polishing of mirror segments

Walker, D., Beaucamp, A., Evans, R., Fox-Leonard, T., Fairhurst, N., Gray, C., Hamidi, S., Li, H., Messalink, W., Mitchell, J., Rees, P. & Yu, G., 1 Dec 2012, Modern Technologies in Space- and Ground-Based Telescopes and Instrumentation II. Vol. 8450. 84502A

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polishing
polishing
Hexagon
Smoothness
Mirror
47 Citations (Scopus)

Edges in CNC polishing: From mirror-segments towards semiconductors, paper 1: Edges on processing the global surface

Walker, D., Yu, G., Li, H., Messelink, W., Evans, R. & Beaucamp, A., 27 Aug 2012, In : Optics Express. 20, 18, p. 19787-19798 12 p.

Research output: Contribution to journalArticle

polishing
mirrors
telescopes
hexagons
planets
22 Citations (Scopus)

Implementing a grolishing process in Zeeko IRP machines

Yu, G., Walker, D. & Li, H., 20 Sep 2012, In : Applied Optics. 51, 27, p. 6637-6640 4 p.

Research output: Contribution to journalArticle

Polishing
polishing
Polishing machines
Power spectral density
Abrasives
8 Citations (Scopus)

Research on fabrication of mirror segments for E-ELT

Yu, G., Walker, D. & Li, H., 1 Dec 2012, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies. Vol. 8416. 841602

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Extremely Large Telescopes
Polishing
Telescopes
Fabrication
Mirror
9 Citations (Scopus)

Thin glass shell oriented to wide field X-ray telescope

Civitani, M. M., Citterio, O., Campana, S., Conconi, P., Mattaini, E., Pareschi, G., Tagliaferri, G., Parodi, G., Burwitz, V., Hartner, G. D., Arnold, J., Schuler, S., Combrinck, H., Freeman, R., Morton, R., Simpson, P. & Walker, D., 1 Dec 2012, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray. Vol. 8443. 84430Q

Research output: Chapter in Book/Report/Conference proceedingConference contribution

X-ray Telescopes
Wide-field
Fused silica
Telescopes
Shell
2011
16 Citations (Scopus)

Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments

Song, C., Walker, D. & Yu, G., 1 Jul 2011, In : Optical Engineering. 50, 7, 073401.

Research output: Contribution to journalArticle

Interferometers
Mirrors
interferometers
mirrors
aspheric optics
19 Citations (Scopus)

Modelling and measurement of polishing tool influence functions for edge control

Li, H., Yu, G., Walker, D. & Evans, R., 1 Jan 2011, In : Journal of the European Optical Society. 6, 1 p., 11048.

Research output: Contribution to journalArticle

polishing
profilometers
profiles
interferometers
telescopes
10 Citations (Scopus)

Progress on precise grinding and polishing of thin glass monolithic shell (towards WFXT)

Citterio, O., Civitani, M. M., Arnold, J., Campana, S., Combrinck, H., Conconi, P., Cotroneo, V., Freeman, R., Mattaini, E., Morton, R., Motta, G., Pareschi, G., Parodi, G., Proserpio, L., Schuler, S., Simpson, P., Tagliaferri, G. & Walker, D., 8 Nov 2011, Optics for EUV, X-Ray, and Gamma-Ray Astronomy V. Vol. 8147. 814714

Research output: Chapter in Book/Report/Conference proceedingConference contribution

X-ray Telescopes
Polishing
Grinding
Wide-field
grinding
18 Citations (Scopus)

Removal of mid spatial-frequency features in mirror segments

Yu, G., Li, H. & Walker, D., 1 Jan 2011, In : Journal of the European Optical Society. 6, 1 p., 11044.

Research output: Contribution to journalArticle

mirrors
grinding
smoothing
specifications
fabrication

Research in new polishing techniques for off-axis mirror segments

Walker, D. D., Yu, G. & Li, H., 1 Dec 2011, Proceedings - ASPE 2011 Annual Meeting. Vol. 52. p. 31-34 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Technologies for producing segments for Extremely Large Telescopes

Walker, D., Atkins, C., Baker, I., Evans, R., Hamidi, S., Harris, P., Li, H., Messelink, W., Mitchell, J., Parry-Jones, M., Rees, P. & Yu, G., 28 Nov 2011, Optical Manufacturing and Testing IX. Vol. 8126. 812604

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polishing machines
Extremely Large Telescopes
Grinding mills
Polishing
Pilot plants