We measured laser-action properties of some novel eight-position substituted 1, 3, 5, 7-tetramethyl-2, 6-diethyl pyrromethene-BF<sub>2</sub> complexes in a Littman-type cavity pumped by the second harmonic of a <i>Q</i>-switched Nd:YAG laser. The substitution effects were investigated by comparing the spectroscopic and laser-action properties of various eight-position substituted complexes, such as absorption, excitation, and fluorescence emission, and triplet–triplet absorption spectra, dye-laser wavelength-tuning spectra, and output-pulse energy versus the pump-laser energy. The results showed that 1, 3, 5, 7-tetramethyl-2, 6-diethyl pyrromethene-BF<sub>2</sub> complexes with phenyl, <i>p</i>-methoxyphenyl, and <i>p</i>-fluorophenyl substituted at the eight-position outperformed the commercially available benchmark laser dye Rhodamine 6G (Rh6G) in fluorescence quantum yields, laser efficiency, and laser wavelength-tuning range.
© 2001 Optical Society of America
Feng Liang, Heping Zeng, Zhenrong Sun, Yizhong Yuan, Zuguang Yao, and Zhizhan Xu, "Eight-position substitution effects on laser action of the 1,3,5,7-tetramethyl-2,6-diethyl pyrromethene-BF2 complexes," J. Opt. Soc. Am. B 18, 1841-1845 (2001)