I am trying to focus a 2.5w blue solid state laser diode... But then this happens (attached images)...

No clear small dot is ever achieved... Any idea why? There always this "line" crossing the focal point..

This arrived as this from factory..

Is it a optic flaw? A diode flaw? Is it... Normal ?

I have co2 experience... But solid state lasers are yet a new field for me. Any feedback would be highly appreciated..