Rayleigh lengthnumerical aperture

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Those of us of a certain age still refer to screw sizes as imperial – we often hear the words can I have a box of 1”x 8’s please?

Rayleigh lengthcalculator

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Many manufacturers still market screws that way, but for those of you who find it frustrating buying in metric, here’s a handy conversion chart.

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Hello everyone. I am currently working with an input collimated gaussian laser beam of 0.8mm width, which propagates through several lenses and focuses at a distance of 30mm from the last surface of the lens. My objective is to measure the spot size and rayleigh length of my Gaussian beam at an off-axis position. I attempted to use POP (Physical Optics Propagation) for this purpose, but unfortunately, the results did not align as expected.