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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 18 — Jun. 20, 2010
  • pp: 3522–3537

Wavefront control of the Large Optics Test and Integration Site (LOTIS) 6.5 m Collimator

Steven C. West, Samuel H. Bailey, James H. Burge, Brian Cuerden, Jeff Hagen, Hubert M. Martin, and Michael T. Tuell  »View Author Affiliations

Applied Optics, Vol. 49, Issue 18, pp. 3522-3537 (2010)

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The LOTIS Collimator provides scene projection within a 6.5 m diameter collimated beam used for optical testing research in air and vacuum. Diffraction-limited performance (0.4 to 5 μm wavelength) requires active wavefront control of the alignment and primary mirror shape. A hexapod corrects secondary mirror alignment using measurements from collimated sources directed into the system with nine scanning pentaprisms. The primary mirror shape is controlled with 104 adjustable force actuators based on figure measurements from a center-of-curvature test. A variation of the Hartmann test measures slopes by monitoring the reflections from 36 small mirrors bonded to the optical surface of the primary mirror. The Hartmann source and detector are located at the f / 15 Cassegrain focus. Initial operation has demonstrated a closed-loop 110 nm rms wavefront error in ambient air over the 6.5 m collimated beam.

© 2010 Optical Society of America

OCIS Codes
(110.0110) Imaging systems : Imaging systems
(110.6770) Imaging systems : Telescopes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.1680) Instrumentation, measurement, and metrology : Collimation
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.1080) Optical design and fabrication : Active or adaptive optics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 17, 2010
Revised Manuscript: May 21, 2010
Manuscript Accepted: May 22, 2010
Published: June 14, 2010

Steven C. West, Samuel H. Bailey, James H. Burge, Brian Cuerden, Jeff Hagen, Hubert M. Martin, and Michael T. Tuell, "Wavefront control of the Large Optics Test and Integration Site (LOTIS) 6.5m Collimator," Appl. Opt. 49, 3522-3537 (2010)

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