Low aspect ratio transverse optical patterns indye-doped nematic liquid crystals
✍ Scribed by R. Macdonald; U. Damerau; H. Danlewski
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 435 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0960-0779
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✦ Synopsis
Spontaneous transverse two!dimensional optical pattern formation has been observed with dye! doped nematic liquid crystals in front of a single feedback mirror[ It is shown that photo!thermally excited dispersive optical nonlinearities are responsible for the observed spatial instabilities[ The appearence and symmetry of the patterns obtained within _nite diameter laser beams in low aspect ratio regimes are discussed in terms of Bessel function modes[ Furthermore\ a comparision of self!focussing versus self! defocussing nonlinearities has been performed by using ordinary or extra!ordinary polarized input beams[