I have found one more after WkLaser sales person recommended it
https://yllaser.en.alibaba.com/produ...367.0.0.x2JY4W

It is either DLT-280(280W) or DLT-300(300W) model. Both have two tube design inside and working from two power supplies. So if I go with it I won't need a Brewster window and may be able to connect them to the HVPS from GSI tubes. And I guess I should worry about polarization as beams should be combined inside the unit.

The price is not bad, $5000 for DLT-280 and about $7000 for DLT 300