Infrared imaging using a tip-tilt secondary mirror

Laird M. Close, Donald W. McCarthy

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


We have recently developed the first adaptive system to utilize a tip-tilt Cassegrain secondary mirror. The system (called FASTTRAC) is also unique since it uses an infrared array to track the brightest speckle of the guide star. FASTTRAC can correct wavefront slope fluctuations at up to 100Hz closed loop and stabilize image motion to less than 0.1" rms in the focal plane. The system requires an infrared guide star of 8th mag at K (22μm). The resulting 54×54" images show improvements of up to -300% in resolution (FWHM) when tracking the brightest speckle of the infrared guide star.

Original languageEnglish (US)
Pages (from-to)353-363
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Aug 25 1993
EventActive and Adaptive Optical Components and Systems II 1993 - Albuquerque, United States
Duration: Feb 1 1993Feb 4 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Infrared imaging using a tip-tilt secondary mirror'. Together they form a unique fingerprint.

Cite this