Coating Phase Control in Multi-Wavelength Adaptive Optics
Abstract
Recent observations of multi-wavelength directed energy systems have shown that adaptive optic correction is not consistent between different spectral bands. One major reason for this behavior is optical coating design. Typical coatings have strongly wavelength-dependent phase variations, which means that unless design precautions are taken, a single phase correction such as that of a deformable mirror will not apply properly across multiple spectral bands, for example those of an HEL, BIL, and TIL. Analogous errors can also be seen for beams or portions of beams striking optics and mirrors with the same wavelength but at multiple angles, for example during focusing with a high NA mirror or lens. However, there are design techniques for optical coatings that can mitigate these problems. In this program, we will develop a general theory for optimal coating design for multiwavelength adaptive optics and experimentally demonstrate optical coatings with near-identical phase variation characteristics across multiple wavelength bands. The basic theory and demonstration in continuous wave visible and near-IR wavelengths will take place at the University of Minnesota while extension to longer wavelengths near 2-3.5ï�m with an emphasis on high energy per pulse and high repetition rate will occur at the University of Adelaide.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 22, 2024
- Source ID
- FA23862314119
Entities
People
- Miftar Ganija
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Adelaide