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The Z4203/N1211A tube is similar to HP/Agilent/Keysight 5501B/5517 tubes. Also see note, above. This is normal. It has an RS232 port, though the command set is not known. (This can be changed.). The output of these lasers should be within +/-10 MHz of the published optical frequency specifications of 473.612234 THz (corresponding to a vacuum wavelength of 632.991372 nm).
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