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Photoerasable and photorewritable spatially-tunable laser based on a dye-doped cholesteric liquid crystal with a photoisomerizable chiral dopant

Photoerasable and photorewritable spatially-tunable laser based on a dye-doped cholesteric liquid crystal with a photoisomerizable chiral dopant

Authors :
Cang Yi Shyu
Po Chih Yang
Shuan Yu Huang
Chia Rong Lee
Ting Shan Mo
Shih-Hung Lin
Jui-Hsiang Liu
Source :
Optics Express. 18:9496
Publication Year :
2010
Publisher :
The Optical Society, 2010.

Abstract

This study investigates, for the first time, a photoerasable and photorewritable spatially-tunable laser using a dye-doped cholesteric liquid crystal (DDCLC) with a photoisomerizable chiral dopant (AzoM). UV illumination via a photomask with a transmittance-gradient can create a pitch gradient in the cell such that the lasing wavelength can be spatially tuned over a wide band of 134nm. The pitch gradient is generated by the UV-irradiation-induced gradient of the cis-AzoM concentration and therefore the induced gradient of the cell HTP value, resulting in the spatial tunability of the laser. Furthermore, the laser has advantages of photoerasability and photorewritability. The spatial tunability of the laser can undergo more than 100 cycles of photoerasing and photorewriting processes without decay or damage.

Details

ISSN :
10944087
Volume :
18
Database :
OpenAIRE
Journal :
Optics Express
Accession number :
edsair.doi.dedup.....ae44a4ccef1d5adf0d9c0f662da50a62
Full Text :
https://doi.org/10.1364/oe.18.009496