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Sensitive absorption measurements in bulk material and coatings using a photothermal and a photoacoustic spectrometer

: Fieberg, Stephan; Waasem, Niklas; Kühnemann, Frank; Buse, Karsten


Vodopyanov, K.L. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear Frequency Generation and Conversion. Materials, Devices, and Applications XIII : 4-6 February 2014, San Francisco, CA, USA
Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 8964)
ISBN: 978-0-8194-9877-9
Paper 896410, 7 S.
Conference "Nonlinear Frequency Generation and Conversion - Materials, Devices, and Applications" <13, 2014, San Francisco/Calif.>
Fraunhofer IPM ()
absorption; spectroscopy; crystal; glass; photothermal; photoacoustic; lithium niobate; lithium triborate

Bulk and surface absorption in lithium triborate (LBO) and lithium niobate (LiNbO3) are measured using two sensitive measurement techniques, a photoacoustic spectrometer (PAS) and a photothermal common-path interferometer (PCI). As pump light sources, optical parametric oscillators are employed, covering the wavelength ranges 212 − 2500 nm (PAS) and 1460 − 1900 nm and 2460 − 3900 nm (PCI). The spectrometers are used to measure absorption spectra of optical materials across this wide spectral range and to compare the methods in the shared wavelength regime.