The fiber collimators of series 60FC-Q typically are used in quantum optical systems with narrow line width lasers.
In these fiber collimators, the quarter-wave plate is placed directly after the fiber receptacle in the diverging beam.
Thus, we use low-order waveplates for this application because they have a ten times smaller angular dependence compared to zero-order waveplates.
It may be better to use zero-order plates only if the parts are used in a non-temperature-stabilized environment or if they are used with a broadband source.
Series 60FC-Q fiber collimators with zero-order plates are available upon request.