We describe the functional capabilities of the time-resolved photothermal common-pass interferometry method. For two thermo-optical effect-based methods, photothermal common-pass interferometry and time-resolved photothermal common-pass interferometry, the achieved detection limit for absorption measurements in ultrapure quartz glasses (5 × 10−7 cm−1 and 2 × 10−9 cm−1, respectively) is given. The problem of calculating the variation of the refractive index tensor under local heating trigonal-symmetric crystals of class 32 by a focused laser beam is considered. For these crystals, it is shown that the problem of the influence of deformations on the measured signal is reduced to determine a thermo-optical parameter (an analog of dn/dT). The calculation of this parameter does not require a complete solution to the strain problem when the crystals are heated locally by laser radiation. The formulas for calculating the thermo-optical parameter P and its numerical values are presented. They are required to calibrate absorption measurements in crystalline quartz using the time-resolved photothermal common-pass interferometry scheme. For a full understanding, formulas of the theory of equilibrium deformations used in this study are presented. An analysis of the relevance of improving the thermo-optical method sensitivity for concentration measurements of pollutant inclusions in crystals, ultrapure quartz glasses, and ambient air is presented.
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28 January 2021
Research Article|
January 22 2021
High-sensitive absorption measurement in ultrapure quartz glasses and crystals using time-resolved photothermal common-pass interferometry and its possible prospects
Special Collection:
Photothermics
K. V. Vlasova
;
K. V. Vlasova
a)
Institute of Applied Physics of the Russian Academy of Sciences
, 46 Ulyanova St., Nizhny Novgorod 603950, Russia
a)Author to whom correspondence should be addressed: ksenia.vlasova@ipfran.ru
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A. I. Makarov
;
A. I. Makarov
Institute of Applied Physics of the Russian Academy of Sciences
, 46 Ulyanova St., Nizhny Novgorod 603950, Russia
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N. F. Andreev
N. F. Andreev
Institute of Applied Physics of the Russian Academy of Sciences
, 46 Ulyanova St., Nizhny Novgorod 603950, Russia
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a)Author to whom correspondence should be addressed: ksenia.vlasova@ipfran.ru
Note: This paper is part of the Special Topic on Photothermics.
J. Appl. Phys. 129, 043101 (2021)
Article history
Received:
June 30 2020
Accepted:
December 31 2020
Citation
K. V. Vlasova, A. I. Makarov, N. F. Andreev; High-sensitive absorption measurement in ultrapure quartz glasses and crystals using time-resolved photothermal common-pass interferometry and its possible prospects. J. Appl. Phys. 28 January 2021; 129 (4): 043101. https://doi.org/10.1063/5.0020437
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