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HL: Halbleiterphysik

HL 15: Photonische Kristalle III

HL 15.13: Vortrag

Dienstag, 9. März 2004, 13:15–13:30, H17

Tunable mirrorless lasing based on short pitch Ferroelectric Liquid Crystals — •W. Haase, K. Yoshino, M. Kasano, and M. Ozaki — Technische Universitaet Darmstadt, Institut fuer Physikalische Chemie, Petersenstr. 20, 64287 Darmstadt

The helical pitch of Ferroelectric Liquid Crystals can be tuned via heating or via variyng the strength of the applied external electrical field. The so called short pitch FLC-materials allowing the selective reflection of external laser light, hence they are acting as stop band. The applied external field can influence the length of the helical pitch by ca. 30 nm. Preparing specific mixtures is giving rise for a broad wavelength range mirrorless lasing (1,2). Along the talk the fundamentals and the experimental conditions will be discussed. 1)Electrically tunable waveguide laser based on ferroelectric liquid crystals, M. Kasano, M. Ozaki, K. Yoshino, D. Ganzke, W. Haase Appl. Phys. Lett., 82, 4026-4028 (2003). 2) Electro-Tunable Liquid-Crystal Laser M. Ozaki, M. Kasano, T. Kitasho, D. Ganzke, W. Haase, K. Yoshino, Adv. Mater., 15, 974-977 (2003)