In particular, the invention relates to blue and ultraviolet laser devices using {HEAD ~ II VI compound} such as ZnSe, or SiC, which were difficult in {TAIL ~ the prior art} 
difficult in
In particular , the invention relates to blue and ultraviolet laser devices using { HEAD ~ II VI compound } such as ZnSe , or SiC , which were difficult in { TAIL ~ the prior art }
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