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A multiple pass optical cell and method comprising providing a pair of opposed cylindrical mirrors having curved axes with substantially equal focal lengths, positioning an entrance hole for introducing light into the cell and an exit hole for extracting light from the cell, wherein the entrance hol

A multiple pass optical cell and method comprising providing a pair of opposed cylindrical mirrors having curved axes with substantially equal focal lengths, positioning an entrance hole for introducing light into the cell and an exit hole for extracting light from the cell, wherein the entrance hole and exit hole are coextensive or non-coextensive, introducing light into the cell through the entrance hole, and extracting light from the cell through the exit hole.

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What is claimed is: 1. A multiple pass optical cell comprising a pair of opposed spherical cylindrical mirrors having curved axes with substantially equal focal lengths, an entrance hole for introducing light into the cell at approximately a center of one of said cylindrical mirrors, and an exit ho

What is claimed is: 1. A multiple pass optical cell comprising a pair of opposed spherical cylindrical mirrors having curved axes with substantially equal focal lengths, an entrance hole for introducing light into the cell at approximately a center of one of said cylindrical mirrors, and an exit hole for extracting light from the cell, wherein said entrance hole and exit hole are coextensive or non-coextensive, and wherein said curved axes are crossed at angles other than approximately 0, 90, 180, and 270 degrees. 2. The optical cell of claim 1 additionally comprising a rotation mount for one of said mirrors permitting rotation of said curved axes with respect to one another. 3. The optical cell of claim 1 wherein a plurality of number of passes of light between the two mirrors exist for light entering said entrance hole and exiting said exit hole for any given combination of mirror separation distance and angle of crossing of said curved axes. 4. The optical cell of claim 1 wherein manufacturing tolerances as to said focal lengths are adjusted for by varying mirror separation distance. 5. A multiple pass optical cell comprising a pair of opposed cylindrical mirrors having curved axes crossed at angles other than approximately 0, 90, 180, and 270 degrees, an entrance hole for introducing light into the cell, and an exit hole for extracting light from the cell, wherein said entrance hole and exit hole are coextensive or non-coextensive and wherein light is introduced through the center of one of said cylindrical mirrors. 6. The optical cell of claim 5 wherein said curved axes have substantially equal focal lengths. 7. The optical cell of claim 6 wherein manufacturing tolerances as to said focal lengths are adjusted for by varying mirror separation distance. 8. The optical cell of claim 5 additionally comprising a rotation mount for one of said mirrors permitting rotation of said curved axes with respect to one another. 9. The optical cell of claim 5 wherein a plurality of number of passes of light between the two mirrors exist for light entering said entrance hole and exiting said exit hole for any given combination of mirror separation distance and angle of crossing of said curved axes. 10. A multiple pass optical cell method comprising the steps of: providing a pair of opposed spherical cylindrical mirrors having curved axes with substantially equal focal lengths; positioning an entrance hole for introducing light into the cell at approximately a center of one of the cylindrical mirrors and an exit hole for extracting light from the cell, wherein the entrance hole and exit hole are coextensive or non-coextensive; introducing light into the cell through the entrance hole; and extracting light from the cell through the exit hole; and wherein the curved axes are crossed at angles other than approximately 0, 90, 180, and 270 degrees. 11. The method of claim 10 additionally comprising the step of providing a rotation mount for one of the mirrors permitting rotation of the curved axes with respect to one another. 12. The method of claim 10 wherein a plurality of number of passes of light between the two mirrors exist for light entering the entrance hose and exiting the exit hole for any given combination of mirror separation distance and angle of crossing of the curved axes. 13. The method of claim 10 wherein manufacturing tolerances as to the focal lengths are adjusted for by varying mirror separation distance. 14. A multiple pass optical cell method comprising the steps of: providing a pair of opposed cylindrical mirrors having curved axes crossed at angles other than approximately 0, 90, 180, and 270 degrees; positioning an entrance hole for introducing light into the cell and an exit hole for extracting light from the cell, wherein the entrance hole and exit hole are coextensive or non-coextensive; introducing light into the center of one of the cylindrical mirrors; introducing light into the cell through the entrance hole; and extracting light from the cell through the exit hole. 15. The method of claim 14 wherein the curved axes have substantially equal focal lengths. 16. The method of claim 15 wherein manufacturing tolerances as to the focal lengths are adjusted for by varying mirror separation distance. 17. The method of claim 14 additionally comprising the step of providing a rotation mount for one of the mirrors permitting rotation of the curved axes with respect to one another. 18. The method of claim 14 wherein a plurality of number of passes of light between the two mirrors exist for light entering the entrance hole and exiting the exit hole for any given combination of mirror separation distance and angle of crossing of the curved axes.