Sensitivity enhancement in photothermal interferometry by balanced detection of the complex response to moving excitation
OPTICS LETTERS(2021)
Abstract
The sensitivity of photothermal detection relies on both the magnitude of the response of a sample to excitation and the way the response is sensed. We propose a highly sensitive photothermal interferometry by addressing the above two issues. One is the use of moving excitation to enable a different manner in sample heating and cooling, which results in a strong thermoelastic response of the sample. The other is the use of a balanced Mach-Zehnder interferometer with a defocused probe beam to sense the complex response induced by the phase delays taking place at the sample surface and in the surrounding air. The method was verified experimentally with a Nd-doped glass to have 68-fold sensitivity enhancement over the classical photothermal common-path interferometry. (C) 2021 Optical Society of America
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Key words
photothermal interferometry,balanced detection,sensitivity,complex response
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