Laser interferometer for length measurements

Lenkova, G. A.; Lokhmatov, A. I.; Gurin, E. I.; Koronkevich, V. P.; Kolesova, E. B.; Tarasov, G. G.

doi:10.1007/bf00994940

Cited by 2 publications

(1 citation statement)

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“…It is traceable to the primary standard of length 28 and is thus very accurate in measuring physical displacement of reflective objects as well as changes in the refractive index of transparent gases. This detector is thus both, a displacement measuring device 29 and a refractometer 30 , exactly what is needed to simultaneously probe the surface bending of a heated reflective solid and the temperature rise in the gas above the heated sample, since both information can be encoded into the optical phase difference (OPD). The HQLI This is the author's peer reviewed, accepted manuscript.…”

Section: Introductionmentioning

confidence: 99%

Influence of edge effects on laser-induced surface displacement of opaque materials by photothermal interferometry

Flizikowski

Anghinoni

Rohling

et al. 2020

Journal of Applied Physics

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We demonstrate the influence of edge effects on the photothermal-induced phase shift measured by a homodyne quadrature laser interferometer and compare the experiments with rigorous theoretical descriptions of thermoelastic surface displacement of metals. The finite geometry of the samples is crucial in determining how the temperature is distributed across the material and how this affects the interferometer phase shift measurements. The optical path change due to the surface thermoelastic deformation and thermal lens in the surrounding air is decoded from the interferometric signal using analytical and numerical tools. The boundary/edge effects are found to be relevant to properly describe the interferometric signals. The tools developed in this study provide a framework for the study of finite size effects in heat transport in opaque materials and are applicable to describe not only the phase shift sensed by the interferometer but also to contribute to the photothermal-based technologies employing similar detection mechanisms.

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Section: Introductionmentioning

confidence: 99%