Abstract
A double-cavity optical configuration designed to maximize the power available from cw lasers is reported. A passive supplementary cavity is strongly coupled to the main active laser cavity. It is shown theoretically that higher powers are available inside the passive cavity than those achievable by operating the same laser in a two-mirror configuration designed for optimum coupling. Furthermore, the power inside the passive cavity is equal to or greater than the useful circulating power in the two-mirror configuration. Key aspects of the theory are verified with a high power cw argon laser.
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