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Related Experiment Videos

Pyramid sensor for segmented mirror alignment.

S Esposito1, E Pinna, A Puglisi

  • 1Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125-Firenze, Italy. esposito@arcetri.astro.it

Optics Letters
|October 8, 2005
PubMed
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This study demonstrates a pyramid wavefront sensor for aligning segmented mirrors, achieving a 10 nm residual error. This technique is promising for phasing large astronomical telescopes.

Area of Science:

  • Optical engineering
  • Astronomical instrumentation

Background:

  • Segmented mirrors are crucial for large telescopes.
  • Precise alignment of mirror segments is challenging.

Purpose of the Study:

  • To demonstrate a pyramid wavefront sensor for cophasing and aligning segmented mirrors.
  • To evaluate the sensor's performance in controlling piston, tip, and tilt.

Main Methods:

  • Laboratory experiment using a pyramid wavefront sensor.
  • Iterative alignment procedure for segmented mirrors with three degrees of freedom.
  • Measurement of wavefront residual error.

Main Results:

  • Achieved a wavefront residual error of approximately 10 nm.
  • Error was equally distributed among piston, tip, and tilt adjustments.

Related Experiment Videos

  • Demonstrated simultaneous sensing of piston, tip, and tilt.

    • Conclusions:

    • Pyramid wavefront sensor effectively cophases and aligns segmented mirrors.
    • The technique is suitable for astronomical segmented telescopes, including extremely large telescopes.