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a) Oval-shape 500 nm long-pass dichroic beam splitter fixed inside the final mechanical mounting. b) Size comparison of a customary matchstick next to the final probe illustrates the miniature appearance of the device with a spatial extent of only 1.6 mm in diameter, a length of 6.7 mm and a total weight of 60±10 mg excluding the wires. Scale bars 2.0 mm, respectively.
