Optical design & Instrumentation

Ivan Syniavskiy

Ultrathin camera lens

The basic approach to the creation of ultrathin high quality lens is based on the modernization of classical optical system of an astronomical telescope Cassegrain type with the addition of "fold" aspheric mirrors to reduce the thickness of the optical system, as well as correction of aberrations.

This approach to creating a system was made possible by the emergence of technologies of precision diamond turning. It is particularly for the manufacture of high-quality optics and IR with which the surface can be manufactured satisfactory quality for the visible range. In the future, the use of magnetorheological polishing significantly improves the quality of these surfaces.

During the design of the optical layout were used the following sources:

  • Eric J. Tremblay, Ronald A. Stack, Rick L. Morrison and Joseph E. Ford Ultrathin cameras using annular folded optics // Applied Optics. – 2007. - Vol. 46, Issue 4. – p. 463-471.
  • Eric J. Tremblay, Ronald A. Stack, Rick L. Morrison, Jason H. Karp, and Joseph E. Ford Ultrathin four-reflection imager // Applied Optics. – 2009. – Vol. 48, Issue 2. – p. 343-354.
  • Eric J. Tremblay, Joel Rutkowski, Inga Tamayo, Paulo E. X. Silveira, Ronald A. Stack, Rick L. Morrison, Mark A. Neifeld, Yeshaiyahu Fainman, and Joseph E. Ford Relaxing the alignment and fabrication tolerances of thin annular folded imaging systems using wavefront coding //Applied Optics. – 2007. – Vol. 46, Issue 27, p. 6751-6758.
  • E. R. Dowski, Jr. and W. T. Cathey Extended depth of field through wavefront coding // Applied Optics.- 2005. – Vol.34. – p. 1859–1866.
The Optical layout with rays propagation

Parameters:

  • Focal length
    23 mm
  • Image size (diagonal)
    8.5 mm
  • Aperture ratio
    1:0,9
  • Spectral range
    480-650 nm
  • MTF values through the field
    0.3 for freq. 100 p.line/mm
Spot diagram
Modulate transfer function