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Distributed feedback lasing from electrically tunable dye-doped polymer-liquid crystal transmission gratings

: Sakhno, O.V.; Gritsai, Y.; Stumpe, J.


Laser physics letters 11 (2014), Nr.11, Art. 115812, 8 S.
ISSN: 1612-2011
ISSN: 1612-202X
Fraunhofer IAP ()

In the present work we report low-threshold distributed feedback (DFB) lasing from electrically tunable holographic polymerliquid crystal transmission gratings of POLIPHEM type doped with pyrromethene 567. Due to their uniform droplet-free micro-morphology, the POLIPHEM gratings possess high diffraction efficiency and excellent optical quality. Second-order lasing with a threshold of ~0.8µJ/pulse and a bandwidth of ~1nm was achieved under the excitation of a frequency-doubled Nd:YAG laser operating at 532nm. The laser emission wavelength was tuned from 572625nm by varying the grating period. Application of an electric field switches off or tunes the lasing intensity. An electrically-induced blue-shift of the output laser emission was observed.