Applied Optics42(6),1040–1047(2003), DOI10.1364/AO.42.001040. Primary byline Ian N.Ross, Marta Csatári and Steve Hutchins; CLF affiliation and i.n[email protected].uk match the1998/99 CLF directory. Abstract reports multipass saturated gain over6000, short-term output stability0.2% rms and long-term0.7% rms under the reported conditions.