Point spread function computation in normal incidence for rough optical surfaces

Kashmira Tayabaly; Daniele Spiga; Giorgia Sironi; Rodolfo Canestrari; Michele Lavagna; Giovanni Pareschi

doi:10.1117/12.2232320

10 August 2016 Point spread function computation in normal incidence for rough optical surfaces

Kashmira Tayabaly, Daniele Spiga, Giorgia Sironi, Rodolfo Canestrari, Michele Lavagna, Giovanni Pareschi

Proceedings Volume 9911, Modeling, Systems Engineering, and Project Management for Astronomy VII; 99111X (2016) https://doi.org/10.1117/12.2232320
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The Point Spread Function (PSF) allows for specifying the angular resolution of optical systems which is a key parameter used to define the performances of most optics. A prediction of the system's PSF is therefore a powerful tool to assess the design and manufacture requirements of complex optical systems. Currently, well-established ray-tracing routines based on a geometrical optics are used for this purpose. However, those ray-tracing routines either lack real surface defect considerations (figure errors or micro-roughness) in their computation, or they include a scattering effect modeled separately that requires assumptions difficult to verify. Since there is an increasing demand for tighter angular resolution, the problem of surface finishing could drastically damage the optical performances of a system, including optical telescopes systems. A purely physical optics approach is more effective as it remains valid regardless of the shape and size of the defects appearing on the optical surface. However, a computation when performed in the two-dimensional space is time consuming since it requires processing a surface map with a few micron resolution which sometimes extends the propagation to multiple-reflections. The computation is significantly simplified in the far-field configuration as it involves only a sequence of Fourier Transforms. We show how to account for measured surface defects and roughness in order to predict the performances of the optics in single reflection, which can be applied and validated for real case studies.

Citation Download Citation

Kashmira Tayabaly, Daniele Spiga, Giorgia Sironi, Rodolfo Canestrari, Michele Lavagna, and Giovanni Pareschi "Point spread function computation in normal incidence for rough optical surfaces", Proc. SPIE 9911, Modeling, Systems Engineering, and Project Management for Astronomy VII, 99111X (10 August 2016); https://doi.org/10.1117/12.2232320

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available