Re: Problem with Laser-fiber coupler

Thanks for your answers

@Mr. Roberts: Yes, it's polarized, with a polarization ratio of about
500:1, as the data*** says.

@Mr. Goldwasser: In practice, you say that the backreflection can be
the main cause of this oscillation, and that I must to use the AFC
connector, to minimize it? Or I can solve it in another way?

@Mr. jk: I've seen this Application note:
http://www.ozoptics.com/ALLNEW_PDF/DTS0071.pdf
This is the company from which the local reseller has taken fiber and
coupler. In the last two pages you can see the note about alignment.
The connector key is aligned with the slow axis, so, to mantain
polarization with my He-Ne, laser, I must to have this key connector
at the top, considering that the laser is vertically-polarized, right?
Do you think that changing the angle can reduce power oscillations?
And, considering that I actually don't know who have built the fiber,
the slow axis of the fiber core aligned with the key connector, it's a
standard or I can have some other combination? Because for me it's
difficult to rotate the fiber, considering that we must to create a
mechanical adapter between the coupler and the laser head.

@Mr. Ron: II'm actually using the OZ coupler HPUCO-23-400/700-P-3.5AC,
as I've said in the first post of this thread. Do you think that this
is not good for this type of laser?

Daniele


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