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Double-clad structures and proximity coupling for diode-bar-pumped planar waveguide lasers

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4 Author(s)
Bonner, C.L. ; Optoelectron. Res. Centre, Southampton Univ., UK ; Bhutta, T. ; Shepherd, D.P. ; Tropper, A.C.

We report, for the first time, fabrication of double-clad planar waveguide structures and their use for multiwatt, diode-bar-pumped, planar waveguide lasers based on Nd/sup 3+/ and Yb/sup 3+/-doped YAG. The direct-bonded, five-layer structures of sapphire, YAG, and rare-earth-doped YAG have sufficient numerical aperture to capture the fast-axis divergence of a diode bar by proximity coupling with no intervening optics, leading to very simple and compact devices. The restriction of the doped region to the central core leads to diffraction-limited laser output in the guided direction. We also show that the direct-bonding fabrication process can lead to a linearly polarized output.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:36 ,  Issue: 2 )