A fiber optic rotary joint assembly comprising: a first optical component having a first optical axis, a first optical axis adjuster, and a first base element having a first precision surface ; and a second optical component having a second optical axis, a second optical axis adjuster, and a second base element having a second precision surface adapted to mate slidingly with the first precision surface with a predetermined range of motion, wherein the first optical component is a rotating unit and the second optical component is a stationary component; wherein the first optical axis adjuster is adapted to adjust at least one of the pitch and yaw angles and the translational displacements of a collimator inside the first optical axis adjuster for the first optical axis to assume a first specific geometric relationship with the first precision surface such that the first optical component rotates around the first optical axis, wherein the second optical axis adjuster is adapted to adjust at least one of the pitch and yaw angles of a collimator inside the second optical axis adjuster for the second optical axis to assume a second specific geometric relationship with the second precision surface such that, if the first optical element and second optical element are combined into an assembly, the first optical axis is parallel with the second optical axis, and wherein after the first optical axis and second optical axis have each been adjusted to be parallel with one another, the second base element is adapted to slidingly mate with the first base element by movement of the second precision surface in a single plane to combine the first optical component and second optical component into the assembly such that the first optical axis and second optical axis are sufficiently collinear. a first optical component having a first optical axis, a first optical axis adjuster, and a first base element having a first precision surface ; and a second optical component having a second optical axis, a second optical axis adjuster, and a second base element having a second precision surface adapted to mate slidingly with the first precision surface with a predetermined range of motion, wherein the first optical component is a rotating unit and the second optical component is a stationary component; wherein the first optical axis adjuster is adapted to adjust at least one of the pitch and yaw angles and the translational displacements of a collimator inside the first optical axis adjuster for the first optical axis to assume a first specific geometric relationship with the first precision surface such that the first optical component rotates around the first optical axis, wherein the second optical axis adjuster is adapted to adjust at least one of the pitch and yaw angles of a collimator inside the second optical axis adjuster for the second optical axis to assume a second specific geometric relationship with the second precision surface such that, if the first optical element and second optical element are combined into an assembly, the first optical axis is parallel with the second optical axis, and wherein after the first optical axis and second optical axis have each been adjusted to be parallel with one another, the second base element is adapted to slidingly mate with the first base element by movement of the second precision surface in a single plane to combine the first optical component and second optical component into the assembly such that the first optical axis and second optical axis are sufficiently collinear. <EOS>