Andreas, Andrea and I were discussing Snoutscope alignment, and I was complaining about the scan unit: it's hard to align the galvo, and the scan lenses lose more light than we'd like. (Right, @DougPShepherd?)
Andreas asked my favorite question:
"Why don't you just...?"pic.twitter.com/PCXQK8gGBP
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Andreas sketched a galvo-mirror-mirror design, arguing that the output beam scans laterally without changing direction, just like a lens-galvo-lens system... ...but ditching the scan lenses reduces photon loss by an order of magnitude! AND alignment tolerances go from μm to mm!pic.twitter.com/LgaFAILiff
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You need a large (slow) galvo, but even a sluggish 50 Hz galvo would yield a blazing-fast 100 volumes-per-second Snoutscope. So I rushed home to prototype! I used stock
@Thorlabs parts, substituting a 2" mirror for the galvo that I don't have yet.pic.twitter.com/ZICFEpRKcr
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With axial path length <400 mm, it fits between tube lens 1 and 2, so in addition to more photons, cheaper parts and relaxed alignment, it also folds up the longest part of the path, replacing box "B" in the Snoutscope. Use the right magnification though! https://andrewgyork.github.io/high_na_single_objective_lightsheet/index.html#fig_SOLS_ref_design …pic.twitter.com/fauwiIKA4r
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Alignment protocol: Center your input beam on the galvo, and tilt the galvo until it almost clips. Use the far edges of your two mirrors to catch and return the reflected beam to the far edge of the galvo. Optionally, tune mirror positions and repeat to improve FOV.
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Now, I need your help, Snouty family. Where can we get flat, fast, big galvos? Ideally, 50 mm. Tag helpful folks, please.
@RetoPaul@kD3AN@IlariaTesta4@DougPShepherd@Bin_YANG_Optics@loicaroyer@Maurice_Y_Lee@DrDonnaWhelan@adam_k_glaser@gailmcconnell@jsdaniel02pic.twitter.com/mcE1ZC0Sj3Prikaži ovu nit -
PS: peer review and reproduction of results in a matter of hours, thanks to
@Maurice_Y_Lee!https://mobile.twitter.com/Maurice_Y_Lee/status/1222420483561279490 …
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This looks awesome! A nice lateral shearing interferometer. Does "Scandreas" scan with a constant optical path length as well?
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I always think of those Thorlabs shear plates when I picture a lateral shearing interferometer, so my first reaction is "that's not what this is!" But it sounds like you mean that in a more general sense. Can you explain more?
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Neat trick! I thought this would be a good excuse to try out using
@geogebra, so here's my (not great) animation of what Scandreas does for those that don't like thinking about corner cubes: https://www.geogebra.org/graphing/xcjeewrd … -
Beautiful! I didn't know about that tool. A slick animation adds a lot of value to these tweets! NB the beam path here is slightly different than the one I used; my second galvo reflection is closer to normal incidence than my first galvo reflection.
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