Abstract

We report a 10³ increase in efficiency of second-harmonic generation in Tm³⁺-doped aluminosilicate glass fibers when the wavelength of the fundamental beam is tuned to the maximum of the ³H₆ → ³F₄ absorption of Tm³⁺ at 785 nm. This result shows the role of resonance enhancement in the nonlinear optical process that is responsible for the formation of the χ⁽²⁾ grating.

© 1993 Optical Society of America

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