Pulsed laser interference patterning of polyimide grating for dye-doped polymer laser

Soon Yie Kok; Teck Yong Tou; Seong Ling Yap; Seong Shan Yap

doi:10.1117/1.JNP.10.033003

8 February 2016 Pulsed laser interference patterning of polyimide grating for dye-doped polymer laser

Soon Yie Kok, Teck Yong Tou, Seong Ling Yap, Seong Shan Yap

Author Affiliations +

Journal of Nanophotonics, Vol. 10, Issue 3, 033003 (February 2016). https://doi.org/10.1117/1.JNP.10.033003

Abstract

Direct laser interference patterning of polyimide (PI) films was performed by using a pulsed 355-nm laser. At laser fluence of 0.4 J/cm², gratings with spatial periods of 3.8 μm to 344 nm were created. The highest aspect ratio of the grating structure (0.8) was obtained for the 344-nm grating. An all-polymer dye laser was then fabricated by spin-coating a layer of disodium fluorescein (DF)-doped polyvinyl alcohol (PVA) film on bare and patterned PI substrate. Green laser emission was obtained when transversely pumped by a 355-nm laser. The lasing threshold reduced by ∼10 times for the sample with 344-nm grating while the laser intensity was ∼18 times higher. The enhancements are ascribed to the 344-nm grating structures, which act as an efficient distributed feedback resonator and distributed Bragg reflector grating for DF-doped PVA emitting at ∼563 nm, on top of being a passive light-trapping structures.

Citation Download Citation

Soon Yie Kok, Teck Yong Tou, Seong Ling Yap, and Seong Shan Yap "Pulsed laser interference patterning of polyimide grating for dye-doped polymer laser," Journal of Nanophotonics 10(3), 033003 (8 February 2016). https://doi.org/10.1117/1.JNP.10.033003

Published: 8 February 2016

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