Triplet extinction coefficients of some laser dyes. II

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Abstract
We measured the triplet extinction coefficients εT over the laser action spectral region of DODC, DMC, Sulforhodamine B, Rhodamine 575, Coumarin 523, Coumarin 521, Coumarin 504, Coumarin 498, Coumarin 490, LD466, bis‐MSB, and BBO. We employed the different lines from an argon‐ and a krypton‐ion cw laser for excitation. McClure’s method [J. Chem. Phys. 1 9, 670 (1951)] was again employed to measure the triplet extinction coefficients. We provide a simplified derivation of McClure’s equation. The triplet extinction coefficient of Rhodamine 575 was also measured by using the depletion method and improving it by reconstructing for true triplet‐triplet (T‐T) absorption. The εT value obtained is in good agreement with the one obtained by McClure’s method.