Multiple beam internal structuring of poly(methyl methacrylate)

Dun Liu, Walter Perrie, Zheng Kuang, P. J. Scully, A. Baum, S. Liang, A. Taranu, S. P. Edwardson, E. Fearon, G. Dearden, K. G. Watkins

    Research output: Contribution to journalArticlepeer-review


    Spatial light modulator addressed with computer generated holograms is used to diffract femtosecond laser pulses into > 15 parallel beams and focused simultaneously inside poly(methyl methacrylate) (PMMA) for high throughput 3D refractive index modification. Uniform modification throughout the structure is demonstrated and used to create a 19 μm pitch, 5 × 5 × 3.5 mm3 thick volume grating in <50 minutes with first order Bragg diffraction efficiency > 65%. Thick volume phase gratings are created by carefully stitching filamentary modifications. PMMA shows a remarkable time dependent Δn, related to the photochemistry during and after exposure.
    Original languageEnglish
    Pages (from-to)208-211
    Number of pages3
    JournalJournal of Laser Micro Nanoengineering
    Issue number2
    Publication statusPublished - May 2012


    • Femtosecond laser
    • PMMA
    • Refractive index modification
    • Spatial light modulator
    • Volume grating


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