A mirror bearing for an interferometer , the mirror bearing comprising: a mounting member configured for rigid coupling to the interferometer at a first end of the mounting member and comprising: a bore extending through the mounting member along a longitudinal axis of the mounting member , and a drive coil receiving area (134; 304; 404; 608a, 608b) configured to hold, in a fixed position, a drive coil (302; 402; 604a, 604b) coupled to the mounting member at the drive coil receiving area (134; 304; 404; 608a, 608b); the mirror bearing further comprising a mobile mirror assembly comprising: a tube configured to receive, through a first end of the tube , a second end of the mounting member disposed opposite the first end of the mounting member , wherein the tube is configured for slidable movement relative to the stationary mounting member along the longitudinal axis during operation of the interferometer, a mirror coupled to a second end of the tube opposite the first end of the tube , and a drive magnet coupled to the mirror and disposed within the tube , wherein the drive magnet is configured to be received through the second end of the mounting member and disposed within the bore of the mounting member . a mounting member configured for rigid coupling to the interferometer at a first end of the mounting member and comprising: a bore extending through the mounting member along a longitudinal axis of the mounting member , and a drive coil receiving area (134; 304; 404; 608a, 608b) configured to hold, in a fixed position, a drive coil (302; 402; 604a, 604b) coupled to the mounting member at the drive coil receiving area (134; 304; 404; 608a, 608b); the mirror bearing further comprising a bore extending through the mounting member along a longitudinal axis of the mounting member , and a drive coil receiving area (134; 304; 404; 608a, 608b) configured to hold, in a fixed position, a drive coil (302; 402; 604a, 604b) coupled to the mounting member at the drive coil receiving area (134; 304; 404; 608a, 608b); the mirror bearing further comprising a mobile mirror assembly comprising: a tube configured to receive, through a first end of the tube , a second end of the mounting member disposed opposite the first end of the mounting member , wherein the tube is configured for slidable movement relative to the stationary mounting member along the longitudinal axis during operation of the interferometer, a mirror coupled to a second end of the tube opposite the first end of the tube , and a drive magnet coupled to the mirror and disposed within the tube , wherein the drive magnet is configured to be received through the second end of the mounting member and disposed within the bore of the mounting member . a tube configured to receive, through a first end of the tube , a second end of the mounting member disposed opposite the first end of the mounting member , wherein the tube is configured for slidable movement relative to the stationary mounting member along the longitudinal axis during operation of the interferometer, a mirror coupled to a second end of the tube opposite the first end of the tube , and a drive magnet coupled to the mirror and disposed within the tube , wherein the drive magnet is configured to be received through the second end of the mounting member and disposed within the bore of the mounting member . <EOS>