A beam expander can enlarge an input beam by the factor M, but it can also reduce it by the factor 1/M with a reversed optical beam path. Beam expanders are optical systems for increasing or decreasing the diameter of a laser beam. 📦 For purchasing, use the RP Photonics Buyer's Guide for beam expanders. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. And, for students or those. A beam splitter divides incident light into reflected and transmitted beams at a specified R/T ratio. R = reflectance, T = transmittance, A = absorptance (ideally zero) When comparing beam splitters, always check whether the specified R/T ratio is for. Once you have determined the need for a beam expander, selecting the correct beam expander can be a daunting task due to the numerous options available.
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