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The optimization of light absorption in a weakly absorbing medium is studied by repeatedly reflecting a light beam from either plane or cylindrical canted and parallel mirrors. Vertical control is exerted either by horizontal mirror reflection, by cylindrical end mirrors, or by wellcollimated or focused beams. Useful absorption for a number of numerical parameters is calculated. The gross properties of lasers are characterized for geometrical optical purposes. Beam insertion optics are evaluated. Chamber and mirror energetics are considered. In the Appendix one of us (JJD) gives the shape and speed of a light beam eating its way into a very highly absorbing medium.

Optical design of a reaction chamber for weakly absorbed light. I. Canted and parallel mirrors (with an appendix for strongly absorbed light waves)