445 nm diode focus problem

[kambotwister]

Hi i got a problem, my 445 nm 1.4 W laser got glow problem. I dont know how to say in english. just look on photos and tell me how to fix it

focused with 3 element lense, and unfocused without lense
When unfocused dont seen any bad. When focused u will see on the left small glow. How to fix it.
Sorry about my english

http://imageshack.us/photo/my-images/600/20120118085244216.jpg/
http://imageshack.us/photo/my-images/846/20120118085427297.jpg/

 

[Lotus_Darkrose]

That's a normal abnormality of a 445nm multi-mode diode. Sometimes the square shaped artifact is very noticable, sometimes it is not.

 

[Blord]

Try with another lens. You could have a bad lens with internal reflections.

 

[kambotwister]

I got 2 pics lenses and the problem with the each one. Maybe i have got one of lense put incorrect. Can anyone show how should be correct position?