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Reekie, L.
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Publications (4/4 displayed)
- 2004UV inscription of sub-micron periodic structures in "hard" optical materials and waveguides
- 2001Gratings in indium oxide film overlayers on ion-exchanged waveguides by excimer laser micromachiningcitations
- 2000Bragg gratings in ternary SiO2 SnO2 Na2O optical glass fiberscitations
- 2000Relief gratings on Er/Yb-doped borosilicate glasses and waveguides by excimer laser ablationcitations
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article
Gratings in indium oxide film overlayers on ion-exchanged waveguides by excimer laser micromachining
Abstract
Relief Bragg gratings were imprinted by 248nm interferometric excimer laser ablation on potassium ion-exchanged channel waveguides in BK-7 glass overlaid with a thin high-index InO<sub>x</sub> film. Using five pulses of energy density 60mJ/cm<sup>2</sup>, a spectral transmittance notch of depth 66% and Δλ < 0.1nm was obtained at 1547nm in the TE polarisation for a waveguide having a nominal width of 8µm and a 135nm thick InO<sub>x</sub> overlayer. In waveguides coated with 100nm InO<sub>x</sub>, with widths increasing from 3µm to 8µm, the reflection wavelength shifted by 0.12nm/µm and the reflectivity increased monotonically.<br/>