29-30 September, 1 and 2 October 2015
SMETHODS+ course on optical design

Program: SMETHODS schedule 2015.doc

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Purpose:
Hands-on training in design and optimisation of optical imaging systems supported by a theoretical introduction. At the end of the session, trainees will be able to specify an optical imaging system, propose the general layout, and understand the methods used to characterize its performance. On simple systems, they will be able to select a starting point, run the optimisation and estimate tolerances. On more complex cases, including for their own needs, they can interact efficiently with highly skilled experts.

Overview :
Training domain 1 provides hands-on experience in the design of image-forming optical systems. Its particular approach will be to treat these systems as a whole, i.e. from the source to the detector and to specify the respective roles of the designer and of the software.

The full session consists of five consecutive days. The first 2 days cover theoretical backgrounds in geometrical and instrumental optics, sources and detectors, as well as an introduction to optimization theory. A half a day break is scheduled on the afternoon of the third day. The two following days, practical training will be provided. The hands-on training will deal with realistic optical design problems: how to start an optical design, how to develop it and how to make a decision when to stop.  Different optical design programs will be used: Zemax, CODEV, SYNOPSYS.

Trainees will be provided printed hand-outs of all presentations at the beginning of the session. A list of recommended literature, such as textbooks, articles, will be also provided,

Course description:

  • Main laws of geometrical optics and ray tracing through simple components
  • Stigmatism: Fermats principle; stigmatic surfaces and their limits
  • Gauss theory of paraxial optics; Lagrange Helmholtz invariant; cardinal points; conjugate relationships
  • Aperture and field stops; third order geometric and chromatic aberrations
  • Polarization of light: Fresnel reflection coefficients
  • Image of a point source through a perfect, diffraction limited, optical system
  • Image of a point source by actual systems:  wave-front error (WFE) and Point Spread Function (PSF)
  • Modulation Transfer Function (MTF) of an image forming system: definition, methods of measurements
     
  • Bases of radio-photometry:  parameters and units of optical radiations: flux, intensity, radiance, irradiance, étendue (throughput)
  • Spectral properties of radiations and components: thermal (blackbody) and luminescent radiations; particular case of coherent sources, lasers
  • Radiometric properties of image forming systems:  throughput, transmittance, case of aplanatic systems:  Abbe sine condition and étendue conservation
  • On-axis and off-axis radiometry of imaging optical systems: cos4 law and vignetting
  • Detectors for imaging applications: main families and parameters
  • Exercises on the above material
     
  • Basic ideas of optimization
  • Local optimization of optical imaging systems; simple example of optimization: triplet design (ZEMAX)
  • Minimizing the error function; constraints
  • Damped least-squares algorithm for local optimization; anomalies in local optimization algorithms
  • Steps towards global optical system optimization
  • Optimization exercise that the participants will do independently (CODE V)
  • Real-world designs
  •  Hands-on training with one optical element (singlets), spherical surfaces and aspherical surfaces
     

Hands-on training by instructors from TNO:

  • General optical systems, classification, combinations of optical elements. Practical exercises with two-lens and two-mirror combinations, e.g. photographic objective, microscope objective, afocal system (telescope), relay lens (projector) and mirror-lens combinations
  • Design of multi-element optical systems, e.g. triplets, Gauss lenses, telephotos, Kepler and Galilean telescopes, eyepieces, microscope objectives.

Costs €1700 incl. VAT.

more information: www.smethods.eu