Beam coupler

A coupler assembly for a fiber laser, comprising:

• a tubular housing extending along a central axis and having a sidewall with an interior surface, art exterior surface, a first end and a second end;
• input and output collimator units configured with:
• respective collimator housings extending through respective first and second ends of the tubular housing and terminating at an axial distance from one another within the tubular housing;
• respective lens assemblies mounted in respective collimator housings;
• a compression mechanism configured and arranged to concentrically align the input collimator unit and the output collimator unit about the central axis;
• and an alignment mechanism coupled to one of the input and output collimator units, the collimator housings of respective input and output collimator units each being configured with an outer sub-housing and an inner sub-housing, the inner sub-housing of the one collimator unit being displaceably mounted within the outer sub-housing thereof and receiving the lens assembly which is pres-fit thereinto, the alignment mechanism being configured and arranged to adjust the inner sub-housing of the one collimator unit relative to the outer sub-housing thereof so that the lens assemblies of respective input and output collimator units are optically aligned about a common optical axis upon being concentrically adjusted about the central axis.