Thermal effects vs. gain in femtosecond laser written waveguides in neodymium doped fused silica
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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.
KeywordsPump Power Refractive Index Change Laser Glass Gain Measurement Integrate Optical Device
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