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-1H, 5H-benzo[ij] quinolizin-9–1)ethenyl)-4H-pyran-4-ylidene) propanedinitrile (DCJTB) and 4-dicyanomethylene-2-methyl-6-(p-dimethyl-aminostyryl)-4H-pyran (DCM), doped in polystyrene (PS) matrices were studied and compared. It was found that DCJTB has a larger net gain, 40.72 cm−1, a lower loss, 2.49 cm−1, and a lower threshold, 0.16 (mJ/pulse)/cm2, than DCM, which has a net gain of 11.95 cm−1, a loss of 9.25 cm−1, and a threshold of 4(mJ/pulse)/cm2. 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)