Single-longitudinal-mode operation of Er3+-P2O5-codoped silica planar waveguide lasers which are equipped with integrated Bragg grating reflectors is demonstrated, with a polarized output of 340 μW at 1546 nm. The gratings are photo-imprinted using 193 nm light exposure through a phase mask in GeO2-free optical waveguides that have been sensitized by H2 loading.

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Journal Electronics Letters
Kitagawa, T. (T.), Bilodeau, F. (F.), Malo, B. (B.), Theriault, S. (S.), Albert, J, Jihnson, D.C. (D. C.), … Hibino, Y. (Y.). (1994). Single-frequency Er3+-doped silica-based planar waveguide laser with integrated photo-imprinted Bragg reflectors. Electronics Letters, 30(16), 1311–1312. doi:10.1049/el:19940888