For use as a laser file - save out the .dxf from the part model, not the drawing sheets. The scale of the drawing view is determining your .dxf size.
In the model, make sure the view is "normal to" the part face that you want the laser file to be prior to "save as". If it's a sheet metal part it doesn't matter, SW will flatten the view for you from the flat pattern automatically.
The scale of the .dxf will be the same as the model.