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Sensors 2013, 13(1), 565-573; doi:10.3390/s130100565

Absorption Measurements of Periodically Poled Potassium Titanyl Phosphate (PPKTP) at 775 nm and 1550 nm

, , , , ,  and *
Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstr. 38, 30167 Hannover, Germany
* Author to whom correspondence should be addressed.
Received: 1 November 2012 / Revised: 6 December 2012 / Accepted: 19 December 2012 / Published: 4 January 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
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The efficient generation of second-harmonic light and squeezed light requires non-linear crystals that have low absorption at the fundamental and harmonic wavelengths. In this work the photo-thermal self-phase modulation technique is exploited to measure the absorption coefficient of periodically poled potassium titanyl phosphate (PPKTP) at 1,550 nm and 775 nm. Themeasurement results are (84±40) ppm/cmand (127±24) ppm/cm, respectively. We conclude that the performance of state-of-the-art frequency doubling and squeezed light generation in PPKTP is not limited by absorption.
Keywords: PPKTP; absorption; photo-thermal PPKTP; absorption; photo-thermal
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Steinlechner, J.; Ast, S.; Krüger, C.; Singh, A.P.; Eberle, T.; Händchen, V.; Schnabel, R. Absorption Measurements of Periodically Poled Potassium Titanyl Phosphate (PPKTP) at 775 nm and 1550 nm. Sensors 2013, 13, 565-573.

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