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Stone, A., Jain, H., Dierolf, V., Sakakura, M., Shimotsuma, Y., Miura, K., Hirao, K., Lapointe, J. and Kashyap, R. (2015) Direct Laser-Writing of Ferroelectric Single-Crystal Waveguide Architectures in Glass for 3D Integrated Optics. Scientific Reports, 5, 10391.
http://dx.doi.org/10.1038/srep10391

has been cited by the following article:

• TITLE: Angular Dependence of the Second Harmonic Generation Induced by Femtosecond Laser Irradiation in Silica-Based Glasses: Variation with Writing Speed and Pulse Energy

  AUTHORS: Jing Cao, Bertrand Poumellec, François Brisset, Anne-Laure Helbert, Matthieu Lancry

  KEYWORDS: Nonlinear Optical Crystal, Glass Ceramics, Direct Writing, Ultrafast Processes, Waveguide

  JOURNAL NAME: World Journal of Nano Science and Engineering, Vol.5 No.3, September 25, 2015

  ABSTRACT: To control second harmonic generation (SHG) in silica-based glasses is crucial for fabricating photonic devices, such as frequency doubling waveguides. Here, we investigated SHG of laser induced nonlinear optical crystals in silica-based glasses, according to writing speed and pulse energy. We observed two regions with different probing laser polarization angular dependence: a) a well-defined cosine-like curve with period of 180° at low pulse energy (0.8 μJ) whatever the writing speed or at high pulse energy (1.4 μJ) with high writing speed (25 μm/s). This is accounted for by a well-defined texture for the nano crystals with their polar axis oriented perpendicular to the writing laser polarization; and b) a double cosine-like curve revealing a second texture of the crystals at high pulse energy (1.4 μJ) with low writing speed (5 μm/s) and with the polar axis oriented closer parallel to the writing laser polarization. Therefore, a SHG dependence on probing laser polarization angle may show high contrast by a correct choice of the writing speed and pulse energy. These results pave the way for elaboration of nonlinear optical devices.