Beam combination is an effective geometry which can improve laser output power with good beam quality. A new and practical four-mirror cavity configuration is presented to combine the beams intracavity. This close-ended scheme is good at withstanding environmental perturbations and is easier to realize the alignment than the conventional Michelson cavity. The length of each arm can be rather short which makes the cavity more compact in practical implement. With this four-mirror cavity, the output brightness is efficiently improved compared to single F-P cavity laser by combining two Nd:YAG lasers. A single beam output exceeding 3.3 W is achieved in this composite cavity, which has the potential for scaling to much higher output power with high brightness.
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Lei et al. (2006) studied this question.
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