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Intrinsic apodization effect in a compact two-mirror system with a spherical primary mirror

Gontcharov, Alexander LU ; Owner-Petersen, Mette LU and Puryayev, DT (2002) In Optical Engineering 41(12). p.3111-3115
Abstract
In so-called compact two-mirror focusing and afocal systems the secondary mirror is situated at the paraxial focus of the spherical primary mirror. The peculiar conelike shape of the secondary is chosen to eliminate the spherical aberration. Thus the systems are stigmatic, but they have a great offence against the sine condition (OSC), creating uneven distribution of energy on the surface of the outgoing wavefront. There is a substantial concentration of energy toward the optical axis, similar to apodization of the pupil. Calculations of the point spread function (PSF) show that in such systems, the Airy disk is slightly enlarged (at most 20%) and the second maximum (the first bright ring) can be completely suppressed. The most effective... (More)
In so-called compact two-mirror focusing and afocal systems the secondary mirror is situated at the paraxial focus of the spherical primary mirror. The peculiar conelike shape of the secondary is chosen to eliminate the spherical aberration. Thus the systems are stigmatic, but they have a great offence against the sine condition (OSC), creating uneven distribution of energy on the surface of the outgoing wavefront. There is a substantial concentration of energy toward the optical axis, similar to apodization of the pupil. Calculations of the point spread function (PSF) show that in such systems, the Airy disk is slightly enlarged (at most 20%) and the second maximum (the first bright ring) can be completely suppressed. The most effective suppression of the second and higher maxima in the diffraction pattern is obtained with an imposed central obscuration ratio of 0.5 and a primary mirror focal ratio of 2. Compact two-mirror afocal and focusing systems have intrinsic apodization, enabling modification of the diffraction pattern without the use of a variable transmission filter or coating at the pupil. (C) 2002 Society of Photo-Optical Instrumentation Engineers. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
compact optical system, point spread function, apodization
in
Optical Engineering
volume
41
issue
12
pages
3111 - 3115
publisher
SPIE
external identifiers
  • wos:000179954500017
  • scopus:0036980212
ISSN
0091-3286
DOI
10.1117/1.1518506
language
English
LU publication?
yes
id
43d1b43b-ef91-4ce8-806f-e44a0e7563dd (old id 320572)
date added to LUP
2007-08-20 16:42:45
date last changed
2017-01-01 06:43:34
@article{43d1b43b-ef91-4ce8-806f-e44a0e7563dd,
  abstract     = {In so-called compact two-mirror focusing and afocal systems the secondary mirror is situated at the paraxial focus of the spherical primary mirror. The peculiar conelike shape of the secondary is chosen to eliminate the spherical aberration. Thus the systems are stigmatic, but they have a great offence against the sine condition (OSC), creating uneven distribution of energy on the surface of the outgoing wavefront. There is a substantial concentration of energy toward the optical axis, similar to apodization of the pupil. Calculations of the point spread function (PSF) show that in such systems, the Airy disk is slightly enlarged (at most 20%) and the second maximum (the first bright ring) can be completely suppressed. The most effective suppression of the second and higher maxima in the diffraction pattern is obtained with an imposed central obscuration ratio of 0.5 and a primary mirror focal ratio of 2. Compact two-mirror afocal and focusing systems have intrinsic apodization, enabling modification of the diffraction pattern without the use of a variable transmission filter or coating at the pupil. (C) 2002 Society of Photo-Optical Instrumentation Engineers.},
  author       = {Gontcharov, Alexander and Owner-Petersen, Mette and Puryayev, DT},
  issn         = {0091-3286},
  keyword      = {compact optical system,point spread function,apodization},
  language     = {eng},
  number       = {12},
  pages        = {3111--3115},
  publisher    = {SPIE},
  series       = {Optical Engineering},
  title        = {Intrinsic apodization effect in a compact two-mirror system with a spherical primary mirror},
  url          = {http://dx.doi.org/10.1117/1.1518506},
  volume       = {41},
  year         = {2002},
}