Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster: New Instruments and Methods

CPP 15.14: Poster

Tuesday, March 27, 2012, 18:15–20:15, Poster A

Electrical fine tuning of liquid crystal lasers — •Jürgen Schmidtke and Heinz-Siegfried Kitzerow — Department Chemie, Universität Paderborn, Germany

We demonstrate high-precision, continuous, electrical tuning of a photonic band-edge laser based on a dye-doped cholesteric liquid crystal. A micro-patterned array of electrodes creates an electric field perpendicular to the cholesteric helix, which distorts the chiral order of the liquid crystal, thus shifting the resonant band edge modes. This configuration allows for smooth tuning of the laser emission in a wavelength range of about 4 nm, using low voltages (of the order of 10 V).