Beam steering by combining two binary phase modulated FLC SLMs
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2003

Ferroelectric Liquid Crystal (FLC) Spatial Light Modulators (SLMs) are attractive because of their high switching speed. However, conventional FLC SLMs are only capable of binary phase modulation. This is inconvenient for beam steering since as much as 60% of the incident power is lost to unwanted diffraction orders. To overcome this problem two cascaded FLC SLMs were used in this work. By coherently imaging a 180° binary-phase FLC SLM onto a 90° FLC SLM, with high precision, an effective four-level phase modulator was realized experimentally. Beam steering was demonstrated in the angular range ±10.9 mrad. The angular inaccuracy of the steered beam was found to be about 0.1 mrad, which equals about 25% of the beam diameter. The beam steering device has also been used for tracking experiments.

Författare

David Engström

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Sverker Hård

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Per Rudquist

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Koen D'Havé

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Tomasz Matuszczyk

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Marek Skeren

Björn Löfving

Proc. SPIE

Vol. 5181 132-143

Ämneskategorier

Telekommunikation