Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Laser Pointer Store

Is IR light

diachi

Well-known member
Joined
Feb 22, 2008
Messages
9,447
Likes
1,322
Points
113
This is all just to sort out a dispute weather IR was light or heat or Electro Magnetic Radiation .

He argued that IR wasn't light ( Because It isn't visible ), But I argued that IF a laser could produce it then it must be light, otherwise IR lasers wouldn't be called Lasers the would be called Hasers ( heat amplification by stimulated emission of radiation ;D ) So what is IR is It light or is It something else ?

He also argued that there were Gamma Lasers in development, but then that also would not be called a laser , as once again Gamma radiation is not light .

Thanks,

Diachi
 

Razako

Well-known member
Joined
Mar 17, 2006
Messages
4,499
Likes
680
Points
113
Actually gamma radiation and IR are both types of light.
 

diachi

Well-known member
Joined
Feb 22, 2008
Messages
9,447
Likes
1,322
Points
113
Because EMR is still all light, as its all photons, its just outside the visible spectrum , Am I right ?

Diachi
 

Razako

Well-known member
Joined
Mar 17, 2006
Messages
4,499
Likes
680
Points
113
Diachi said:
Because EMR is still all light, as its all photons, its just outside the visible spectrum , Am I right ?

Diachi
yes
 

diachi

Well-known member
Joined
Feb 22, 2008
Messages
9,447
Likes
1,322
Points
113
Thank you ! thats that dispute ended ;D We always have disputes like this ::) And me being me, I never want to be wrong, and try to prove that I'm better constantly ;D

Once again I was right ;D

Thanks again Razako, I thought I had read that elsewhere on this forum.

Diachi
 
Joined
Nov 19, 2007
Messages
490
Likes
5
Points
0
Actually, it depends on your interpretation of light.

a)Light is the visible portion of the EM spectrum.

b)Light is any part of the EM spectrum.
 

Switch

New member
Joined
Dec 9, 2007
Messages
3,327
Likes
4
Points
0
happytomato said:
Actually, it depends on your interpretation of light.

a)Light is the visible portion of the EM spectrum.

b)Light is any part of the EM spectrum.
Yeah, that's pretty much so.In day to day life, light means only the visible part, but in science , it's safe to call the whole EM spectrum light.
And about the IR/heat thingy.All bodies that have a temperature emit IR radiation, this is called radiant heat and it has wavelengths of 8 to 14um(that's 8000nm to 14000nm , so it's way beyond our NIR lasers and pump diodes).It's so deep into the IR part of the spectrum it behaves totally differently from visible light and NIR.That range is where CO[sub]2[/sub] laser beams are situated (10600nm).So the IR from a remote control led, or from a pump diode, or from a YAG laser is not heat, however I guess it would kinda make sense to call a CO[sub]2[/sub] laser a "radiant heat laser" (rhaser? :D)
Just so you know. :p
 

GooeyGus

New member
Joined
Mar 8, 2008
Messages
2,673
Likes
38
Points
0
The definition of light is arbitrary, there really is no set point nor any law of physics that determines what is light and what isn't. So really, you're both right.
 

Switch

New member
Joined
Dec 9, 2007
Messages
3,327
Likes
4
Points
0
GooeyGus said:
The definition of light is arbitrary, there really is no set point nor any law of physics that determines what is light and what isn't. So really, you're both light.
LoL, I read this a bit differently and it sounded funny. :D
 

Ace82

New member
Joined
Feb 11, 2008
Messages
1,781
Likes
0
Points
0
In other (my) words: "light" is a term used for humans to reference something.  As humans, we have a need to identify, break down, and measure every freaken thing in existence.  The entire EM spectrum is all measured in the same fashion, in wavelength nm's, or "frequency" can be another referencing term. So how one perceives the word is relative to their own perception, leaving the only true universal fact; all energies (radiation) in the EM spectrum are all based on the exact same foundation.  
 
Joined
Mar 27, 2008
Messages
477
Likes
26
Points
0
Switch said:
...And about the IR/heat thingy.All bodies that have a temperature emit IR radiation, this is called radiant heat and it has wavelengths of 8 to 14um...
I believe the proper term is blackbody radiation.  ;)
 

diachi

Well-known member
Joined
Feb 22, 2008
Messages
9,447
Likes
1,322
Points
113
to what ace was saying, is that the Theory of relativity ( or is it speical relativity, theres too many )

Diachi
 

Switch

New member
Joined
Dec 9, 2007
Messages
3,327
Likes
4
Points
0
Diachi said:
to what ace was saying, is that the Theory of relativity ( or is it speical relativity, theres too many )

Diachi
I think it's just the word "relative" with it's primary sense. :p

I believe the proper term is blackbody radiation.
I knew someone was gonna correct me. :p
 

diachi

Well-known member
Joined
Feb 22, 2008
Messages
9,447
Likes
1,322
Points
113
But is that not what the theory of relativity states, that every one percieves time and space differently according to certain things ?
 

Switch

New member
Joined
Dec 9, 2007
Messages
3,327
Likes
4
Points
0
So how one perceives the word is relative to...
In Ace's context "light" is a word.It's not time nor space.The "Theory of Relativity" also containts the word "relativity".It's also a word that exists beyond the Theory of Relativity, and Ace was using it without refering to the theory...just using the proper meaning of the word "relative".Right? :p
 




Top