A method of and apparatus for performing a transmyocardial revascularization procedure is disclosed which utilizes two laser power sources. A first laser source provides a coagulating or blanching effect on tissue and a second laser source capable of tissue ablation are supplied to a combined optical fiber bundle comprising a plurality of fibers which can be moved axially or rotatively by the operating physician. As the distal end of the fiber bundle is moved forward, bursts of laser energy therefrom may be programmed to first penetrate the epicardium with minimal bleeding and thereafter provide channels or pockets in the myocardium for causing or stimulating angiogenesis.
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