Trying to do burning without proper protection is a recipe for destroyed retinas. Being close up to a focused dot is second only to direct beam exposure in eye-damage terms. If you haven't already, read every stickied post in the Laser Safety forum and make the right choices here.
...Oh hang on a second... I should have checked your post history first
In your posting history you recently advertised a 7W Sanwu for sale with comments about "Burning things was fun for a little bit, but then got boring." Can't decide if you're a troll or just have really short term memory...