Laser into diverging lens... [optics]

[Externet]

What is the difference between (same wavelenght)  LED light and a laser light exiting a diverging lens ?

[studiot]

Laser systems often use lenses (more usually converging or collimating) but the laser light retains its coherence.

So I suppose that basic difference remains.

 

https://www.thorlabs.com/tutorials.cfm?tabID=f7ed0dd5-3f31-4f84-9843-e0f7ac33f413

[John Cuthber]

3 hours ago, Externet said:

What is the difference between (same wavelenght)  LED light and a laser light exiting a diverging lens ?

If you could get an LED that produced such as narrow range of wavelengths as a laser does, there wouldn't be much difference.

[swansont]

The same difference that was present before the lens. 

You have to be more specific. Do the sources have the same charateristics with regard to e.g beam divergence? What does "same wavelength" mean? The center wavelength? The frequency linewidth? Lasers are generally much narrower than LEDs (tens of MHz or even better, vs nm for an LED, which would mean THz) so you would get lesser chromatic effects with a laser.

[studiot]

The term LED is also a bit misleading.

Some LEDs laze most don't.

Also although chemical doping / composition sets the basic light frequency output range, filter correction is also engineered to offer desired colours.

[swansont]

The ones that lase are called lasers.

[John Cuthber]

2 hours ago, studiot said:

 

Some LEDs laze most don't.

 

How did you come to the conclusion that  there was a "Z" in that?

[studiot]

11 hours ago, swansont said:

The ones that lase are called lasers.

My catalogue call them laser diodes, perhaps because they are also diodes.

10 hours ago, John Cuthber said:

How did you come to the conclusion that  there was a "Z" in that?

I seem to remember the verb had a z in it when I last heard it, but I like to spread my bounty evenly and fairly between letters.

 

 

[John Cuthber]

As I laze around on a Saturday afternoon I consider the idea that what lasers do would be lazing if they used ztimulated radiation or if they were lazy.

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