Journal
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Volume 5, Issue 4, Pages S92-S96Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/5/4/361
Keywords
polymethylmethacrylate; polymer optical fibre; refractive index; femtosecond laser
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Polymethylmethacrylate (PMMA) or Perspex is an inexpensive polymer widely used for making the cores of communications grade polymer optical fibres (POFs) and as a substrate for polymer optoelectronic devices and integrated waveguides. Periodic refractive index structures have been written in undoped PMMA using multiple pulses of 40 fs duration from a 1 kHz Ti:sapphire ferntosecond laser operating at the fundamental (800 nm). A refractive index change (Deltan) of 5 +/- 0.5 x 10(-4) was observed before the onset of striations. Optimization of writing conditions for refractive index modification of POF fibres or bulk undoped PMMA will enable structures such as Bragg gratings, long-period gratings, mode couplers, microlens arrays, and zone plates to be written.
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