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The NE2R13B from Thorlabs Inc is a Optical Filter with Center Wavelength(CWL) 633 nm, Filter Diameter 50.8 mm (2 Inch). More details for NE2R13B can be seen below.
340 nm CWL, 25mm DIa., Visible Range Interference Bandpass Filter with 10nm FWHM
2mm thickness Bandpass Filter with Transmitting wavelength of 430 to 500 nm
10.6 µm CWL, 12.5mm Diameter, 1.5 FWHM, IR Bandpass Filter