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

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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Abstract

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 3.0).
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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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