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Shiri R, Stein R, Murphy K, et al. Fabrication of petal-shaped masks for suppression of the on-axis Poisson spot in telescope systems. Rev Sci Instrum. 2016;87(4):043112doi: 10.1063/1.4945793.
Shiri, R., Stein, R., Murphy, K., Hagopian, K., Salari, S., Sankar, S., Hagopian, J., Showalter, M., Stevenson, T., Quijada, M., Threat, F., Friedlander, J., Dillon, T., & Livas, J. (2016). Fabrication of petal-shaped masks for suppression of the on-axis Poisson spot in telescope systems. The Review of scientific instruments, 87(4), 043112. https://doi.org/10.1063/1.4945793
Shiri, Ron, et al. "Fabrication of petal-shaped masks for suppression of the on-axis Poisson spot in telescope systems." The Review of scientific instruments vol. 87,4 (2016): 043112. doi: https://doi.org/10.1063/1.4945793
Shiri R, Stein R, Murphy K, Hagopian K, Salari S, Sankar S, Hagopian J, Showalter M, Stevenson T, Quijada M, Threat F, Friedlander J, Dillon T, Livas J. Fabrication of petal-shaped masks for suppression of the on-axis Poisson spot in telescope systems. Rev Sci Instrum. 2016 Apr;87(4):043112. doi: 10.1063/1.4945793. PMID: 27131659.
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Rev Sci Instrum. 2016 Apr;87(4):043112. doi: 10.1063/1.4945793.

Fabrication of petal-shaped masks for suppression of the on-axis Poisson spot in telescope systems.

The Review of scientific instruments

Ron Shiri, Ryan Stein, Kaitlin Murphy, Kimberly Hagopian, Shirin Salari, Shannon Sankar, John Hagopian, Matthew Showalter, Thomas Stevenson, Manuel Quijada, Felix Threat, Jay Friedlander, Thomas Dillon, Jeffrey Livas

Affiliations

  1. Optics Branch, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  2. Gravitational Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  3. Advanced Manufacturing Branch, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  4. Detector Systems Branch, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  5. Astrophysics Science Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
  6. Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716, USA.

PMID: 27131659 DOI: 10.1063/1.4945793

Abstract

The presence of a bright (Poisson) spot in the geometrical shadow of circular/spherical shapes has been known for the past two centuries. A broad class of telescopes that involve simultaneous transmit and receive require suppression of the reflected light from the secondary mirror on the detector. For instance, the on-axis design of optical telescope for the evolved Laser Interferometric Space Antenna (eLISA), a re-scoped version of the baseline LISA mission concept, requires suppression of reflected laser light from the secondary mirror on the detector. In the past few years, the hypergaussian functions with petal-shaped realization have been shown to significantly suppress intensity along the optical axis. This work reports on fabrication of a series of petal-shaped masks using a variety of techniques such as 3D printing, photolithography, and wire Electro Discharge Machining. These masks are designed and fabricated to operate in the range of Fresnel numbers between 4 and 120. This paper discusses the challenges, successes, and failures of each fabrication technique and the optical performance of typical masks with suggestions for potential follow up work.

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