Abstract
Parallel beam frequency doubling of 170 fs, NIR pulses is demonstrated by placing a thin beta barium borate (BBO) nonlinear crystal after a spatial light modulator. Computer-generated holograms applied to the spatial light modulator create 18 parallel diffracted beams at the fundamental wavelength λ=775 nm, then frequency doubled to λ=387 nm and focussed inside the poly(methyl methacrylate) (PMMA) substrate for refractive index structuring. This procedure, demonstrated for the first time in PMMA, requires careful attention to phase matching of multiple beams and opens up dynamic parallel processing at UV wavelengths where nematic liquid crystal devices are more sensitive to optical damage. By overlapping filamentary modifications, an efficient, stable volume phase grating with dimensions 5×5×2.0 mm3 and pitch Λ=15 μm was fabricated in 18 minutes and reached a first-order diffraction efficiency of 70 % at the Bragg angle.
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Acknowledgements
This work was supported by the UK North West Development Agency under grant N0003200 and European Regional Development Fund (ERDF) under grant X01436PR. The authors acknowledge Professor Miles Padgett and Dr Jonathan Leach of the Department of Physics and Astronomy at the University of Glasgow for providing the SLM control software.
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Liu, D., Perrie, W., Kuang, Z. et al. Multi-beam second-harmonic generation in beta barium borate with a spatial light modulator and application to internal structuring in poly(methyl methacrylate). Appl. Phys. B 107, 795–801 (2012). https://doi.org/10.1007/s00340-012-5068-8
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DOI: https://doi.org/10.1007/s00340-012-5068-8