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

Shih Hung Lin, Cang Yi Shyu, Jui Hsiang Liu, Po Chih Yang, Ting Shan Mo, Shuan Yu Huang, Chia Rong Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)9496-9503
Number of pages8
JournalOptics Express
Volume18
Issue number9
DOIs
Publication statusPublished - 2010 Apr 26

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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