The amplified spontaneous emission and gain characteristics of various fluorescent dyes, 2-(1, 1-dimethylethyl)-6(2-(2, 3, 6, 7-tetrahydro-1, 1, 7, 7-tetramethyl-1<i>H,</i> 5<i>H</i>-benzo[<i>ij</i>] quinolizin-9–1)ethenyl)-4<i>H</i>-pyran-4-ylidene) propanedinitrile (DCJTB) and 4-dicyanomethylene-2-methyl-6-(<i>p</i>-dimethyl-aminostyryl)-4<i>H</i>-pyran (DCM), doped in polystyrene (PS) matrices were studied and compared. It was found that DCJTB has a larger net gain, 40.72 cm<sup>−1</sup>, a lower loss, 2.49 cm<sup>−1</sup>, and a lower threshold, 0.16 (mJ/pulse)/cm<sup>2</sup>, than DCM, which has a net gain of 11.95 cm<sup>−1</sup>, a loss of 9.25 cm<sup>−1</sup>, and a threshold of 4(mJ/pulse)/cm<sup>2</sup>. The improvement of performance in DCJTB PS films is attributed to the larger free volume of DCJTB caused by the introduction of steric spacer groups into the DCJTB molecule.
© 2004 Optical Society of America
Wu Lu, Bo Zhong, and Dongge Ma, "Amplified Spontaneous Emission and Gain from Optically Pumped Films of Dye-Doped Polymers," Appl. Opt. 43, 5074-5078 (2004)