Short Length Large Diameter ND: YAG Crystal - What for?

[diachi]

I have a few : D

This is the lamp that dose all the pumping .

IMG_1503 by TwirlyWhirly555, on Flickr

Not so good picture of the cavity and the YAG rod in its flow tube .

008 by TwirlyWhirly555, on Flickr

outer case of chamber , each end are the lamp connections .

006 by TwirlyWhirly555, on Flickr

Thanks! A picture is worth a thousand words and all that...