Mr. Christian Veltkamp Profile

Christian Veltkamp

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Proceedings Article | 9 March 2007 Paper

Detailed single-shot spectral diagnostics of Q-switched solid state lasers

Christian Veltkamp, A. Petersen, J. Kafka

Proceedings Volume 6451, 64511E (2007) https://doi.org/10.1117/12.713791

KEYWORDS: Pulsed laser operation, Mirrors, Q switched lasers, Interferometers, Solid state lasers, Collimation, Sensors, Diagnostics, Charge-coupled devices, Neodymium

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A measurement station to examine the longitudinal mode structure of Q-switched solid state lasers on a single pulse basis is presented. The key component is a Fabry-Perot interferometer (FPI) providing a high finesse to not only display the full spectral emission bandwidth but also resolve single modes of high gain laser media such as Nd : YVO₄. In addition the setup allows one to link relative pulse energy data to each recorded fringe pattern. It is then used to quantify the spectral information of three lasers with a cavity length of up to 200mm to evaluate correlations among pulse stability, pulse repetition frequency and spectral emission characteristics. The optical approach implies a decaying finesse from approximately 250 to 60 across the measurement range. Therefore the setup can only partially resolve single longitudinal modes of lasers with a cavity length greater than 130mm but still gives a qualitative picture of the emission bandwidth that allows a deeper understanding of the spectral characteristics and thus points the direction for performance improvement.

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