Request InfoHamamatsu CorporationSeven types of optical blocks for use with photomultiplier tube modules are available from Hamamatsu Corp. The compact devices can be combined to meet the specifications of various applications. The series includes an adapter block, a beam expander, a neutral density filter block for light attenuation, combinable bandpass or long-pass filters, four dichroic filter blocks, and a beamsplitter block with a cubic half-mirror to split the incident light beam into reflected and transmitted beams at a ratio of 1:1. 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