Galvanometer-scanning transient phase microscopy with balanced detection and arbitrary pump polarization Article Swipe

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Coleal, Cameron N. , Bartels, Randy A. , Wilson, Jesse W. ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2511.05443

Transient absorption microscopy measures excited-state kinetics based on the imaginary part of the pump-induced perturbation to the complex refractive index, i.e. $\Im \{Δ\mathcal N\}$, with applications in both materials and biomedical sciences. Its complement, transient phase microscopy, enabled by stable inline birefringent interferometry, measures the real part $\Re\{Δ\mathcal N\}$. The ability to switch between absorption and phase measurements may yield a stronger signal, depending on the sample and probe wavelength. To date, however, transient phase has not been coupled with galvanometer scanners, thus limiting it to materials science applications and non-imaging spectroscopy. Here, we extend transient phase microscopy to operate in a fast galvanometer-scanning microscope with balanced detection, comparing amplitude and phase measurements in graphene, hemoglobin, and red blood cells. We examine the impacts and limitations introduced by galvanometer scanning, in addition to relocation of the pump-probe combining dichroic to permit arbitrary polarization of the pump.

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Galvanometer Optics Birefringence Microscopy Materials science Polarization (electrochemistry) Transient (computer programming) Dichroic glass Phase (matter) Microscope Photobleaching Amplitude Optoelectronics Monochromatic color Limiting Laser linewidth Absorption (acoustics) Perturbation (astronomy) Ultrafast laser spectroscopy Transient response Optical microscope Nanosecond Beam splitter

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Type: preprint
Landing Page: https://doi.org/10.48550/arxiv.2511.05443
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OpenAlex ID: https://openalex.org/W7108753452

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DOI: https://doi.org/10.48550/arxiv.2511.05443

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Title: Galvanometer-scanning transient phase microscopy with balanced detection and arbitrary pump polarization

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Publication year: 2025

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Publication date: 2025-11-07

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Authors: Coleal, Cameron N., Bartels, Randy A., Wilson, Jesse W.

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Landing page: https://doi.org/10.48550/arxiv.2511.05443

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Concepts: Galvanometer, Optics, Birefringence, Microscopy, Materials science, Polarization (electrochemistry), Transient (computer programming), Dichroic glass, Phase (matter), Microscope, Photobleaching, Amplitude, Optoelectronics, Monochromatic color, Limiting, Laser linewidth, Absorption (acoustics), Perturbation (astronomy), Ultrafast laser spectroscopy, Transient response, Optical microscope, Nanosecond, Beam splitter

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