Non-Mechanical Digital Beam Steering Systems
- Functional layers: Liquid crystal and liquid crystal polymer films
- Film thickness: 1-5 μm
- Steering angle: up to 60º
- Angular separation: 0.1 mrad
- Re-pointing time: 0.2 - 5 ms
- Number of pointing angles: 2N (N – number of stages)
- Wavelengths: UV-MWIR
- Diffraction efficiency: >95% (circular polarized light)
- Absorption losses per stage: <2% (Vis –NIR-SWIR), <4% (UV, MWIR)
- Wavefront error in diffracted beam: λ/4 (@633 nm)
- Substrates: All major transparent materials, including plastic
- Substrate thickness: 5 μm (plastic sheet) – 5 mm (high degree polished optical windows)
- Clear aperture: >90%
- Assembly thickness per stage: 0.2 – 2 mm
- Low power consumption
References:
-N.V. Tabiryan, S.R. Nersisyan, D.M. Steeves and B.R. Kimball, The Promise of Diffractive
Waveplates, Optics and Photonics News 21, 41-45, 2010.
-H. Sarkissian, S.V. Serak, N.V. Tabiryan, L.B. Glebov, V. Rotar, B.Ya. Zeldovich,
Polarization-controlled switching between diffraction orders in transverse-periodically aligned
nematic liquid crystals, Optics Letters 31, 2248-2250, 2006.