Amplified Spontaneous Emission and Waveguiding Properties of the Colored Merocyanine Form of (1',3'-Dihydro-1',3',3'-trimethyl-6- nitrospiro[2H-1-benzopyran-2,2'-(2H)-indole] Molecules
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- 作者：Luana Persano ; Elisa Mele ; Athanassia Athanassiou ; Roberto Cingolani ; Dario Pisignano
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：August 22, 2006
- 年：2006
- 卷：18
- 期：17
- 页码：4171 - 4175
- 全文大小：129K
- 年卷期：v.18,no.17(August 22, 2006)
- ISSN：1520-5002
文摘
We report a complete study of the properties of amplified spontaneous emission (ASE) of themerocyanine form of the photochromic system, 1',3'-dihydro-1',3',3'-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-(2H)-indole], under nanosecond excitation conditions. ASE line narrowing is clearlyobserved for excitation densities larger than 400 
J cm-2 with a threshold pumping length in the range0.5-1.2 mm. Remarkable waveguiding properties were observed, with losses throughout the organicslab of about 5.7 cm-1. The observation of ASE is discussed in terms of a possible S1-dominatedphotoconversion and excitation/de-excitation dynamics of the photochromic system. These results areimportant in view of the application of merocyanine-based films as active layers for potentially gateablelaser devices.
J cm-2 with a threshold pumping length in the range0.5-1.2 mm. Remarkable waveguiding properties were observed, with losses throughout the organicslab of about 5.7 cm-1. The observation of ASE is discussed in terms of a possible S1-dominatedphotoconversion and excitation/de-excitation dynamics of the photochromic system. These results areimportant in view of the application of merocyanine-based films as active layers for potentially gateablelaser devices.