Diode-bar lasers have been used with great success to pump high power solid state lasers in numerous different geometries; nevertheless it remains a challenge to use the highly asymmetric diode-bar output efficiently. We describe an approach to this problem in which the solid-state gain medium is fabricated as a planar waveguide, into which the high-aspect-ratio emission from the diode-bar can be coupled using a simple optical system. This is a geometry which should in principle handle heat dissipation well. We have investigated the performance of a planar Nd-doped YAG waveguide pumped by a 20-W 807-nm diode-bar. A high-quality, low propagation loss guide is essential for such a device; in this experiment we used a liquid-phase-epitaxy-grown structure. The 5-mm long waveguide had an 80-/spl mu/m-thick 1.5-at.% Nd:YAG core sandwiched between substrate and protective cladding layer of undoped YAG. The Nd content of the core raised its refractive index by 4.8/spl times/10/sup -4/ relative to substrate and cladding, creating an optical waveguide with a numerical aperture of 0.06. Pump radiation from the diode-bar was coupled into the waveguide using a cylindrical lens system which produced a line focus at the input face of the waveguide with measured beam radii of 10 /spl mu/m and /spl sim/1 mm along the guided and non-guided axes respectively. A monolithic laser cavity was formed by dielectric coatings applied to the plane-parallel end-faces of the waveguide.


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    Titel :

    Diode-bar-pumped planar waveguide lasers


    Beteiligte:
    Tropper, A.C. (Autor:in) / Bonner, C.L. (Autor:in) / Brown, C.T.A. (Autor:in) / Shepherd, D.P. (Autor:in) / Clarkson, W.A. (Autor:in) / Hanna, D.C. (Autor:in)


    Erscheinungsdatum :

    01.01.1998


    Format / Umfang :

    135782 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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