8 February 2016 Pulsed laser interference patterning of polyimide grating for dye-doped polymer laser
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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.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Soon Yie Kok, Soon Yie Kok, Teck Yong Tou, Teck Yong Tou, Seong Ling Yap, Seong Ling Yap, Seong Shan Yap, 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 . Submission:


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