Dropping a couple resources here for mode matching, at least how I've done it in the past. Looks like we will need to do some of these calculations in the next few weeks so if you haven't done it I would start here.

1. Calculate the approximate beam waist position. Attached is an example of that. Use a beam profiler to measure the beam size at multiple locations and this script will calculate the approximate beam waist position.

2. Download some form of mode matching tool. Lee has one he prefers, I use this: http://www.sr.bham.ac.uk/dokuwiki/doku.php?id=geosim:jammt It's called jaMMT (just another Mode Matching Tool).

3. Input your calculated waist position, the lenses you have available for mode matching, the preferred location of the new waist, etc, and this program will do the rest. Happy to show people how to do this in more detail in person. It is a pretty easy program to use though.

Happy Mode Matching.