Amplified spontaneous emission and optical gain measurements from pyrromethene 567 - doped polymer waveguides and quasi-waveguides
Amplified spontaneous emission from planar waveguides and quasi-waveguides based on Pyrromethene 567-doped poly(methyl methacrylate) thin films deposited onto quartz and glass substrates is investigated. Films with different thickness were prepared and pumped optically at 532 nm with pulses of up to...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2008 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/51113 |
| Acesso em linha: | http://hdl.handle.net/10261/51113 |
| Access Level: | acceso abierto |
| Palavra-chave: | Dye lasers Laser materials Waveguides Thin films Polymer active devices Polymer waveguides |
| Resumo: | Amplified spontaneous emission from planar waveguides and quasi-waveguides based on Pyrromethene 567-doped poly(methyl methacrylate) thin films deposited onto quartz and glass substrates is investigated. Films with different thickness were prepared and pumped optically at 532 nm with pulses of up to 8 MW/cm2. Pump thresholds for the onset of ASE emission, optical gains and losses were assessed. Net gain coefficients were estimated by fitting the data provided by variable stripe length measurements with a theoretical expression which takes into account saturation. In this way, net gain coefficients of up to 56 ± 9 cm-1 at a pump intensity of 5.3 MW/cm2 for quasi-waveguides and up to 20.6 ± 2.7 cm-1 at a pump intensity of 3.4 MW/cm2 for waveguides, were obtained. Loss coefficients in the waveguides were estimated to be 3.8 ± 0.4 cm-1 and 6.1 ± 1.3 cm-1 for 15 μm and 5 μm thick films, respectively. The results obtained seem to indicate a stronger self-mode-restriction capability in the quasiwaveguides than in conventional total internal-reflection waveguides |
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