English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Measuring small absorptions by exploiting photothermal self-phase modulation

MPS-Authors
/persons/resource/persons40471

Lastzka,  Nico
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons1464

Steinlechner,  Jessica
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons1464

Steinlechner,  Sebastian
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40490

Schnabel,  Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Locator
There are no locators available
Fulltext (public)

Optics49_5391.pdf
(Any fulltext), 641KB

Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-C7E6-9
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.