| |
 |
|
|
Science Forum Index » Optics Forum » [q]shot noise limit determination
Page 1 of 1
|
| Author |
Message |
| sperelat |
 Posted: Fri Apr 25, 2008 7:55 pm |
|
|
|
Guest
|
I'm trying to do quantum squeezing experiment with IR diode laser
light.
Since it's my first time to do squeezing experiment,I need to know
where the shot
noise limit is.
I will get the signal from balanced photodiode,and need to determine
shot noise limit.
And then, I will detect squeezed light and compare its noise level
with the limit.
I found that people don't mention how to get shot noise limit in their
paper nowadays.
I'm trying to find older papers, but still have difficulty.
How do you get the shot noise limit with your laser light? |
|
|
| Back to top |
|
| Jürgen Appel |
| Posted: Sat Apr 26, 2008 6:02 am |
|
|
|
Guest
|
sperelat schrieb:
Quote: I will get the signal from balanced photodiode,and need to determine
shot noise limit.
And then, I will detect squeezed light and compare its noise level
with the limit.
[...]
Quote: How do you get the shot noise limit with your laser light?
There are basically 3 kinds of noise in a balanced photodetector:
a) electrical noise which is independent of the light intensity.
b) shot noise, which causes electrical noise that scales proportionally to
the intensity of the light power on the photodiodes.
c) classical noise in the light that does not balance away completely. This
produces electrical noise increasing quadratically with the light power.
So the most common way to verify that what you see, is really the light shot
noise is to vary the light intensity on your detector and determine the
constant, linear and quadratic scaling coefficient.
Cheers,
Jürgen
--
GPG key:
http://pgp.mit.edu:11371/pks/lookup?search=J%FCrgen+Appel&op=get |
|
|
| Back to top |
|
| |
|
Page 1 of 1
All times are GMT - 5 Hours
The time now is Sat Aug 30, 2008 1:07 am
|
|