Here's what I have in my notes:
'uD laser (n) KGT
sic for {'uD'a'} - an error from the "official charghwI' list" at the KLI web site [source?]
Why do you think this is an error, as opposed to just the same noun with the suffix {-'a'}?
'uD Haqtaj laser scalpel (n) (medical device) [HQ 1.3:9 < veS QonoS]
'uD'a' laser (n) [HQ 1.3:9 < veS QonoS]
If {'uD'a'} is the correct form, it begs the question: "What is {'uD}? Perhaps a beam of light? Or a smallish, low-power laser (suitable for surgical devices), with {'uD'a'} being the more powerful kind used in industry or as a weapon?
This is how I have understood the definitions, that {'uD} and {'uD'a'} both mean "laser", with the latter being a bigger, more powerful, or more important version of the former.