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Using a fibre-coupled collimator F280APC-780 (https://www.thorlabs.com/thorproduct.cfm?partnumber=F280APC-780) to expand to a few mm's (~4mm).
The fibre is either P3-780PMY-2 (https://www.thorlabs.com/thorproduct.cfm?partnumber=P3-780PMY-2) or P3-780PM-FC-2 (https://www.thorlabs.com/thorproduct.cfm?partnumber=P3-780PM-FC-2
Then used a X3 beam expander GBE03-B (https://www.thorlabs.com/thorproduct.cfm?partnumber=GBE03-B) to > 1cm.
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