What is Fabry-Perot FP Laser

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Fiber Optics For Sale Co.

Fiber Optics For Sale Co.

12 жыл бұрын

www.fiberoptics4sale.com/wordp...
Hello everyone, this is Colin from Fiber Optics For Sale.
In this tutorial, I will explain what is a Fabry-Perot Laser, also called FP laser. So let's get started.
FP lasers are named after the French scientists Charles Fabry and Alfred Perot. FP laser is the simplest form of semiconductor laser. It has a active region at the center, and two parallel mirrors on either end. This is also called a Fabry-Perot Resonator.
The right side picture shows the structure of a typical FP laser.
Now let's take a look at how a FP laser works.
The two mirrors and the active medium between them form a laser. This is shown again in the first figure. We need mirrors to provide positive feedback, that is, the return of stimulated photons to an active medium to stimulate more photons. The two mirrors themselves form a resonator with length L.
Let a random wave travel from the left-hand mirror to the right-hand mirror, as the second picture shows. At the right-hand mirror, this wave is reflected; hence, the wave experiences a 180 degree phase shift. As you can see, the wave should have a break in its phase, which is impossible here. In other words, this resonator does not support this wave.
Now let another wave, as shown in the third figure, travel inside a resonator. At the right-hand mirror, the wave experiences a 180° phase shift and continues to propagate. At the left-hand mirror, this wave again has the same phase shift and continues to travel. Thus, the second wave yields a stable pattern called a standing wave.
The only difference between the two waves is their wavelengths. Thus, a resonator can support only a wave with a certain wavelength, the wave that forms a standing-wave pattern.
This resonator supports many wavelengths that can form a standing wave. Wavelengths selected by a resonator are called longitudinal modes.
How many longitudinal modes can a laser diode radiate? A resonator can support an infinite number of waves as long as they form a standing wave. However, the active medium provides gain within only a small range of wavelengths. Since a laser radiation is the result of the interaction of a resonator and an active medium, only several resonant wavelengths that fall within the gain curve might be radiated. This is shown in this figure.
Of course, light generation starts only when gain exceeds loss. Thus, eventually only those resonant wavelengths that are within the gain-over-loss curve will actually be radiated. Compare these two figures, only these three waves will be the actual laser output, the other two modes are not generated since their loss is bigger than their gain.
FP laser provides lumped feedback, which results in many longitudinal modes and, eventually, in a relatively large spectral width. This picture shows the output spectrum of a 1.55um FP laser.
FP lasers are capable of producing high powers, but are typically multimode at higher operating currents.
So there you have it. Please leave your comment below if you'd like to see other topics.
Don't forget to visit fo4sale.com for more free fiber optic tutorials.
I hope you learned a thing or two from this tutorial. I will see you in the next video!

Пікірлер: 54
@kumarsuresh5723
@kumarsuresh5723 9 жыл бұрын
Very simple and cool way of explanation. Thank you!
@akankshakumar8499
@akankshakumar8499 9 жыл бұрын
could not get a better explanation...thanks a ton!! :)
@anantikamehra1694
@anantikamehra1694 8 жыл бұрын
Very concise and to the point explanation! Loved it. Thanks for the video.
@nevermindshort3
@nevermindshort3 8 жыл бұрын
+Anantika Mehra I second that. I study a lasers-course at the moment and the video was helpful for understanding the class.
@nandkhidkikar5350
@nandkhidkikar5350 8 жыл бұрын
Nice explanation of F-P Laser.
@NilayJainhi
@NilayJainhi 9 жыл бұрын
thank you for this video...now i actually understood what is fp laser...thank you:)
@saurabhbedi195
@saurabhbedi195 8 жыл бұрын
Very Nice Explanation !! Please upload the tuneable lasers using ring-resonators. Thanks
@kevinsong1056
@kevinsong1056 7 жыл бұрын
very good explanation! thanks!
@mathk1ng1
@mathk1ng1 8 жыл бұрын
Does anyone know what the receiver of this experiment is measuring? I just did this lab for intermediate physics and found a good wavelength but I'm not sure of the value that the receiver gives me. It's on a scale from 0-1 and has units of "mA". Are those miliamps or an amplitude for the wave?
@memsuniverse
@memsuniverse Жыл бұрын
Thank you great tutorial
@elifnurdayi9897
@elifnurdayi9897 3 жыл бұрын
Great explanations thanks!
@MrPrimanshu
@MrPrimanshu 11 жыл бұрын
thanks fr the explanation....nice work!!!
@jonni2734
@jonni2734 9 ай бұрын
Very useful! Thank you!
@rakshyathapa7438
@rakshyathapa7438 3 жыл бұрын
Nice work!
@eXtremeDR
@eXtremeDR 10 жыл бұрын
Great explanation. Just an idea - wouldn't it be even more effective if the mirrors focus the reflected photons?
@aswinp.k5779
@aswinp.k5779 8 жыл бұрын
Nice explanation
@anonymus126
@anonymus126 8 жыл бұрын
Thx 4 uploading.
@ahmedrajab2400
@ahmedrajab2400 6 жыл бұрын
Thank you. I wish you added more details. but still, appreciated
@haribaskar1716
@haribaskar1716 4 жыл бұрын
good one... can you please share passive mode locking of laser??
@jacobvandijk6525
@jacobvandijk6525 3 жыл бұрын
For the very, very basics it's not a bad video.
@zenlee5826
@zenlee5826 6 жыл бұрын
i'm an indian &i'm so thankful for your tutorial.i need it but its not sufficient.
@jpmorgan187
@jpmorgan187 6 жыл бұрын
Please have a seat right over there. - Chris Hansen
@jalalfathisola9899
@jalalfathisola9899 8 жыл бұрын
Hi there I needed to learn some about fiber optics and fabri parot. your videos helped me alot. Thank you so much. good luck
@betabet5714
@betabet5714 7 жыл бұрын
Do you have an example of active medium? Thanks
@nikolaradakovic5050
@nikolaradakovic5050 7 жыл бұрын
It seems you have explained mode locking on an example of FP
@YasminBello
@YasminBello 5 жыл бұрын
could you help me out on how the fp laser connection works
@mwerensteijn
@mwerensteijn 4 ай бұрын
Thank you!
@SahilMalik-zu8pe
@SahilMalik-zu8pe 6 жыл бұрын
Just Perfect what else i could say👌
@FabianMueller
@FabianMueller 9 жыл бұрын
thank you!
@delaramnematolahi1004
@delaramnematolahi1004 9 жыл бұрын
Thank you :)
@ahmedrajab2400
@ahmedrajab2400 5 жыл бұрын
Thank you
@amrabdelfattah3528
@amrabdelfattah3528 11 жыл бұрын
very nice thanks alot
@ashishdas7249
@ashishdas7249 8 жыл бұрын
Please produce more videos on optics. There are no new videos.
@SudarakaMallawaArachchi
@SudarakaMallawaArachchi 10 жыл бұрын
Thanks :)
@HassanAlMusawi1975
@HassanAlMusawi1975 11 жыл бұрын
thanks
@ARCSTREAMS
@ARCSTREAMS 3 жыл бұрын
cant they make these diodes much bigger?
@ARCSTREAMS
@ARCSTREAMS 3 жыл бұрын
so wont any cavity length work?
@jacobvandijk6525
@jacobvandijk6525 3 жыл бұрын
In theory, yes. As long as L = (1/2 wavelength) x any positive integer, and thus the bigger the integer, the smaller the wavelength.
@ARCSTREAMS
@ARCSTREAMS 3 жыл бұрын
@@jacobvandijk6525would 1/2 wave be the minimum and why does it have to be1/2 not less or full ? i never understood why wavelength comes into play
@jacobvandijk6525
@jacobvandijk6525 3 жыл бұрын
@@ARCSTREAMS With lasers you're dealing with light and light can be described as a combination of electric and magnetic waves. A wave has a wavelength (in space) and a frequency (in time). The 1/2 wavelength has to do with standing waves in the cavity. kzfaq.info/get/bejne/qceGeJqhss7FqJ8.html
@ARCSTREAMS
@ARCSTREAMS 3 жыл бұрын
@@jacobvandijk6525 so when the cavity length accommodates an increment of half waves only then there will only be one or a few standing wave freq's? suppose it accommodated more than or less than half wave on the ends these will cancel the whole wave?
@jacobvandijk6525
@jacobvandijk6525 3 жыл бұрын
@@ARCSTREAMS In theory, an infinite amount of frequencies is possible. But if you want light coming out of your laser, only the visible part of the EM-spectrum is relevant. And yes, only a part of all the waves survive and make a laser 'lase'.
@401jab
@401jab 10 жыл бұрын
Awesome! Perot is pronounced "Pear-oh" though haha
@sabcam2000
@sabcam2000 5 жыл бұрын
Just no. He has a decent "Perot" 's pronunciation. It's PE-RO or PA-RO (where A is pronounced like the letter A)
@davidbrandhuber
@davidbrandhuber 5 жыл бұрын
@@sabcam2000 I think he just wanted to note that the "t" is not pronounced (;
@jacobvandijk6525
@jacobvandijk6525 3 жыл бұрын
Yep, just like Ross Perrot.
@shyfulislambhuyan6718
@shyfulislambhuyan6718 2 жыл бұрын
Ruplirntirpise feni Bangladesh
@TheLightningStalker
@TheLightningStalker 10 жыл бұрын
It's pronounced Parrow, not Pairit.
@dileepk4024
@dileepk4024 5 жыл бұрын
It is good that you found a terrible mistake which could shake the entire scientific community!!!
@inventaunmanana4860
@inventaunmanana4860 5 жыл бұрын
now everything is wrong!!
@mucahitdemirc
@mucahitdemirc 4 жыл бұрын
thanks
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