Thank you for all suggestions about my noisy laser. It seems I might improve things with a severe clean (ABF) of the brewster windows, I have not yet had time to try this. I don't quite understand why dirty windows should cause instability rather than loss of power, but it's not the first time physics has gone over my head. ;~) Will report results and maybe start a highly technical discussion later.... :) Joseph. -- Joseph Webster, Flow Cytometry Facility Centenary Institute, Sydney AUSTRALIA.
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