High-sensitive absorption measurement in ultrapure quartz glasses and crystals using time-resolved photothermal common-pass interferometry and its possible prospects
| Autor: | K. V. Vlasova, N F Andreev, A. I. Makarov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science business.industry Physics::Optics General Physics and Astronomy 02 engineering and technology Photothermal therapy Radiation 021001 nanoscience & nanotechnology Laser 01 natural sciences Signal law.invention Interferometry Optics law 0103 physical sciences 0210 nano-technology Absorption (electromagnetic radiation) business Quartz Refractive index |
| Zdroj: | Journal of Applied Physics. 129:043101 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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