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  Measuring small absorptions by exploiting photothermal self-phase modulation

Lastzka, N., Steinlechner, J., Steinlechner, S., & Schnabel, R. (2010). Measuring small absorptions by exploiting photothermal self-phase modulation. Applied Optics, 49(28), 5391-5398. doi:10.1364/AO.49.005391.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-C7E6-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-C7E9-3
Genre: Journal Article

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Lastzka, Nico1, Author              
Steinlechner, Jessica1, Author              
Steinlechner, Sebastian1, Author              
Schnabel, Roman1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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 Abstract: We present a method for the measurement of small optical absorption coefficients. The method exploits the deformation of cavity Airy peaks that occur if the cavity contains an absorbing material with a nonzero thermorefractive coefficient dn/dT or a nonzero expansion coefficient ath. Light absorption leads to a local temperature change and to an intensity-dependent phase shift, i.e., to a photothermal self-phase modulation. The absorption coefficient is derived from a comparison of time-resolved measurements with a numerical time-domain simulation applying a Markov-chain Monte Carlo algorithm. We apply our method to the absorption coefficient of lithium niobate doped with 7mol.% magnesium oxide and derive a value of αLN=(5.9±0.9)×10−4/cm. Our method should also apply to materials with much lower absorption coefficients. Based on our modeling, we estimate that, with cavity finesse values of the order of 104, absorption coefficients of as low as 10−8/cm can be measured.

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 Dates: 2010
 Publication Status: Published in print
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 Identifiers: DOI: 10.1364/AO.49.005391
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Title: Applied Optics
Source Genre: Journal
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Pages: - Volume / Issue: 49 (28) Sequence Number: - Start / End Page: 5391 - 5398 Identifier: -