[hamdani yusuf (OP)]

I didn't say anything about the temperature you can get by focussing a laser or the sun.
How did you come to the conclusion that the video contradicts what I said?

There's also nothing special about lasers for cooling.

How to cool things using light other than laser?

The same way that you would do it using a laser, but using a different light source.
The fact that you ask this proves that you don't understand how laser cooling works.

[alancalverd]

Does temperature of the detector affect the counter?

Not much. Thermal noise is all at quite low energy compared with an x-ray photon.

[Bored chemist]

I didn't say anything about the temperature you can get by focussing a laser or the sun.
How did you come to the conclusion that the video contradicts what I said?

There's also nothing special about lasers for cooling.

How to cool things using light other than laser?

The same way that you would do it using a laser, but using a different light source.
The fact that you ask this proves that you don't understand how laser cooling works.

Do you realise that heating is not the same as cooling?

[hamdani yusuf (OP)]

Does temperature of the detector affect the counter?

Not much. Thermal noise is all at quite low energy compared with an x-ray photon.

But the effect does exist.

[hamdani yusuf (OP)]

Do you realise that heating is not the same as cooling?

Heating increases temperature, cooling decreases temperature.

[alancalverd]

Does temperature of the detector affect the counter?

Not much. Thermal noise is all at quite low energy compared with an x-ray photon.

But the effect does exist.

Yes. It's all in the electronics textbooks, which is why some photon counters, particularly those looking for low-energy photons, are cooled. Less of a problem with medical x and γ radiations.

[Sheilataylor]

Do you realise that heating is not the same as cooling?

Heating increases temperature, cooling decreases temperature.

Exactly, how simple but at the same time how hard.

[Bored chemist]

Do you realise that heating is not the same as cooling?

Heating increases temperature, cooling decreases temperature.

So...  you do understand that the heating effect you from from focussing sunlight is nothing to do with the "laser" cooling effect, don't you?

[Bored chemist]

Does temperature of the detector affect the counter?

Not much. Thermal noise is all at quite low energy compared with an x-ray photon.

But the effect does exist.

Several effects- all perfectly well explained and catalogued - exist.
https://en.wikipedia.org/wiki/Shot_noise
https://en.wikipedia.org/wiki/Johnson%E2%80%93Nyquist_noise
https://en.wikipedia.org/wiki/Flicker_noise

So what?

[hamdani yusuf (OP)]

So...  you do understand that the heating effect you from from focussing sunlight is nothing to do with the "laser" cooling effect, don't you?

You said that photon from laser is indistinguishable from other sources, wich make them equally good for cooling. The video shows that they are different.   

[hamdani yusuf (OP)]

Several effects- all perfectly well explained and catalogued - exist.
https://en.wikipedia.org/wiki/Shot_noise
https://en.wikipedia.org/wiki/Johnson%E2%80%93Nyquist_noise
https://en.wikipedia.org/wiki/Flicker_noise

So what?

So you can't claim that when the detector registers a spike, it means that a photon is just hitting it.

[Bored chemist]

So...  you do understand that the heating effect you from from focussing sunlight is nothing to do with the "laser" cooling effect, don't you?

You said that photon from laser is indistinguishable from other sources, wich make them equally good for cooling. The video shows that they are different.   

It doesn't show that they are different in a relevant way, does it?

You could still use a non-laser light source for cooling. (I didn't say they were "good" for it, did I?. I said they were not good.You made that up. Why did you do that?)

The point I was making was that laser cooling has nothing to do with the negative electronic temperature in a laser.
Do you understand that?

Incidentally, the video is wrong. The "explanation" about lenses is irrelevant if you use non-imaging optics.

[hamdani yusuf (OP)]

It doesn't show that they are different in a relevant way, does it?

What do you mean by relevant?

You could still use a non-laser light source for cooling. (I didn't say they were "good" for it, did I?. I said they were not good.You made that up. Why did you do that?)

What makes them less good for cooling?

[hamdani yusuf (OP)]

The point I was making was that laser cooling has nothing to do with the negative electronic temperature in a laser.

Why is electronic temperature in a laser said to be negative?

[Bored chemist]

The point I was making was that laser cooling has nothing to do with the negative electronic temperature in a laser.

Why is electronic temperature in a laser said to be negative?

Because it is.
There are more electrons in an upper state than in a lower one.

This still has nothing to do with "laser cooling".

[Bored chemist]

What do you mean by relevant?

I mean relevant.
The differences between laser- and conventional- light are not relevant to the use of light to produce cooling.
For example:
You do not need a temperature inversion to produce cooling.
You do not need coherence to produce cooling (and you do not need a laser to produce coherence anyway.)


Why don't you try thinking about what things mean rather than asking about obvious stuff?

[Bored chemist]

What makes them less good for cooling?

Why not try to work this out for yourself?
Or are you not going to do that, because it would require you to actually learn a bit of science?

[hamdani yusuf (OP)]

The point I was making was that laser cooling has nothing to do with the negative electronic temperature in a laser.

Why is electronic temperature in a laser said to be negative?

Because it is.
There are more electrons in an upper state than in a lower one.

This still has nothing to do with "laser cooling".

It sounds more like undefined or indeterminate.
How does this negative electronic temperature affects the temperature of the container of laser medium? Is it cooled down, or heated up instead?

[hamdani yusuf (OP)]

What do you mean by relevant?

I mean relevant.
The differences between laser- and conventional- light are not relevant to the use of light to produce cooling.
For example:
You do not need a temperature inversion to produce cooling.
You do not need coherence to produce cooling (and you do not need a laser to produce coherence anyway.)

What are the necessary conditions for a light beam to produce cooling effect on an object it's shone on?

[hamdani yusuf (OP)]

What makes them less good for cooling?

Why not try to work this out for yourself?
Or are you not going to do that, because it would require you to actually learn a bit of science?

I'll try to figure it out through experiments when I have the time. There are still many others in my list.
Demonstration videos would also help to reduce efforts. If someone here has the links, I'll be thankful if you can share them here.