Efficient lasing of a mixture of organic dyes at 610 and 670 nm

The efficiency of the lasing regime of a pulsed tunable laser at the "exoti c'' wavelengths of 610 and 670 nm, which are needed in nuclear physics, is investigated. A method for performing model calculations of the active medi a for such a laser, i. e., working mixtures of high-molecular-weight dyes, is developed. The conditions specifying a quasiequilibrium window, in which the achievement of high output characteristics is possible for such a mixt ure at assigned wavelengths, are derived. It is interpreted on the basis of the law of alternating nonequilibria in the theory of nonequilibrium state s. The results obtained are verified experimentally: a high-power miniature pulsed laser with an active medium consisting of a mixture of dye solution s with high output characteristics at the assigned wavelengths of 610 and 6 70 nm is created. (C) 1999 American Institute of Physics. [S1063-7850(99)01 604-3].