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Thermal effects vs. gain in femtosecond laser written waveguides in neodymium doped fused silica

: Matthäus, G.; Burghoff, J.; Will, M.; Nolte, S.; Tünnermann, A.


Applied physics. A 83 (2006), Nr.3, S.347-350
ISSN: 0340-3793
ISSN: 0721-7250
ISSN: 0947-8396 (Print)
ISSN: 1432-0630 (Online)
Fraunhofer IOF ()

The influence of thermal effects in gain measurements of fs laser-written waveguides in actively doped glass is reported for the first time. We show that these effects strongly contribute to the signal enhancement (up to 50% observed). Thus, a new measurement scheme to distinguish between thermal induced signal increase and real amplification is proposed.