Jones, J.K., de Sandro, J.P., Hempstead, M., Shepherd, D.P., Tropper, A.C. and Wilkinson, J.S.
Spectra and energy levels of the trivalent ytterbium ion doped into lithium niobate by thermal indiffusion
At Materials Research Society Symposium New Materials for Advanced Solid State Lasers, United States.
29 Nov - 03 Dec 1993.
An x-cut LiNbO3 substrate has been doped with Yb3+ ions by thermal diffusion from an Yb metal film of thickness 7nm. Polarised absorption and fluorescence spectra of the dopant ion have been measured using Ti-diffused y-propagating channel waveguides prepared in the doped region. Yb is a diode- pumpable laser ion with characteristics which can be compared favourably with those of Nd in some respects; for example the small energy difference between pump and laser photons reduces thermal load facilitating high power operation. A waveguide laser geometry is particularly advantageous for Yb due to the quasi-3-level nature of the laser transition. The simple fabrication technique described here has been used to produce a system which may have the potential to operate as an Yb waveguide laser in an electro-optic host crystal.
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