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                <term xml:lang="en">Biological Physics (physics.bio-ph)</term>
                <term xml:lang="en">FOS: Physical sciences</term>
                <term xml:lang="en">Two-photon Microscopy</term>
                <term xml:lang="en">Light-sheet microscopy</term>
                <term xml:lang="en">Zebrafish Danio rerio</term>
                <term xml:lang="en">Calcium imaging</term>
                <term xml:lang="en">Laser  femtosecond</term>
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              <p>Multiphoton microscopy is widely used for live imaging. However, its acquisition speed remains limited by fluorophore emission rates and photodamage. To increase the pixel rate of a two-photon microscope beyond a few megahertz (MHz), multi-point parallelized schemes have been proposed. Two-photon (2P) light-sheet microscopy emerges as an effective approach for high-speed multiphoton imaging of live specimens, as it enables parallelized excitation while minimizing the required laser power. However, optimizing the signal-to-photodamage ratio in 2P light-sheet microscopy requires to precisely control the illumination parameters, including both wavelength and pulse frequency. Since conventional femtosecond laser sources generally do not allow independent modulation of these parameters, the development of low-cost, efficient and robust strategies to modulate the temporal excitation profile is essential to fully exploit the advantages of 2P light-sheet microscopy. Here, we introduce a compact pulse splitting scheme that meets these criteria. We used cascaded birefringent crystals to convert each excitation laser pulse into an adjustable sequence of collinear sub-pulses. We demonstrate its effectiveness in optimizing 2P light-sheet imaging of live zebrafish embryos. We analyze the impact of pulse splitting on photobleaching, nonlinear photodamage, and imaging performance. Additionally, we demonstrate high-speed 2P imaging of the beating heart and brain calcium dynamics using red fluorophores in live embryos. We achieve kilohertz imaging frame rate, reaching more than 150 MHz pixel rates with fluorescent signal levels above 10 $photons.pixel^{-1}$ using a laser mean power and a peak intensity in the range of 100 mW and 0.1 $TW.cm^{-2}$ at the sample, respectively. This adjustable pulse-splitting scheme allows full advantage to be taken of light-sheet illumination for fast in vivo 2P imaging.</p>
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