White flashes with Red laser

[pseudonomen137]

What are you burning into the nanotube structure for?

Top secret . More on that general project in a later post though.

 

[nikokapo]

[quote author=climbak link=1212355402/12#15 date=1212882957]What are you burning into the nanotube structure for?

Top secret  . More on that general project in a later post though.[/quote]


Booooo

why make Chuck wait?




PS: too obvious you said it just to have somebody ask "why"

 

[Abray]

I'm kinda late coming into this topic, lol, but I see those flashes too with my red laser! And instead of white, sometimes it almost looks a little blue-ish. I always thought it was just from heating the material being burned up to such a high temperature that it began to glow for a nanosecond (however long the flash is).

 

[Switch]

I agree, black body radiation isnt what causes it..


i'm guessing as a camera lens can saturate, our own eyes can saturate too.

i cant really compare it to something else because we dont see 200mW of red light focused on a <1mm spot at 15cm of distance everyday  :

Yes they can saturate, at least the dot of a really powerful laser looks white to me on a white wall. But those flashes are not our eyes saturating.You can't get that effect on a white surface no matter how hard you try, besides, if you look through goggles, you can still see the flash eventhough you can't see your laser.

 

[pseudonomen137]

I agree, black body radiation isnt what causes it..


i'm guessing as a camera lens can saturate, our own eyes can saturate too.

i cant really compare it to something else because we dont see 200mW of red light focused on a <1mm spot at 15cm of distance everyday  :

Nah, not saturation. In my case the laser flashes real quick, and then looks red. When I move the laser over the forest, it flashes white as it moves along. If the laser stops moving, or if you scan it back across the same portion you just burned, it stays the red color.

 

[nikokapo]

Then why!! *snif* :'(

 

[pseudonomen137]

Then why!! *snif* :'(

Already been answered multiple times on the thread. Check back to Razako's post on page 1 or my post on Page 2.

 

[Seoul_lasers]

I have seen the white light as well from several different lasers. It is related with higher temperatures as tomcat says.
Carbon when heated will turn bright white.  Remember that little invention called the carbon arc lamp in the late 1800s...
I have even seen some materials emit blue light from the heat.. especially from MgAl alloys when they combust from a laser.   (MgAl burns pretty well anyway even without the high heat of a laser!!)
Indeed this is called incandescence.