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Dear Matt,
I don't have much experience using LLGs with lasers... But as fat as I know
you can get TEM00 only from a single mode fiber (that is some five to ten
microns in diameter). With thicker fibers more modes can propagate and the
output beam profile depends on which modes you excite, e.g. it depends on
the angle of input beam. The far filed output of a 300 micron (pretty thick)
fiber can easily look like a ring with dark center.
With LLGs it's even more severe, as they are far thicker (3 to 5
millimeters). You may try it yourself by shooting your cheap green pointer
(these usually have surprisingly nice mode structure, crapped only by the
plastic lenses inside) into an LLG. The output is far from gaussian...
Still there is some coherence in the output, and probably you'll get a lot
of speckle. It depends on your application, but most of the time it is not
practical to use LLGs with lasers. You loose all the nice features lasers
(diffraction-limited performance) and the bad features remain (speckle).
So, the last bit: Why do you want that?
Cheers,
zdenek svindrych
---------- Původní zpráva ----------
Od: Matthew Nicholas <[log in to unmask]>
Datum: 19. 7. 2013
Předmět: Liquid light guides for lasers?
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Dear list,
I'm wondering if anyone has any experience using liquid light guides with
lasers? In particular, I'm interested in what the beam profile exiting the
fiber typically looks like (assuming a Gaussian/TEM_00 input), and whether
the emitted light is still spatially coherent. Any experience anyone could
share (including products with which you've had success) would be quite
helpful and much appreciated! I'd also be very interested if anyone can
suggest a good reference on optical properties of liquid light guides that
includes discussion of laser applications. So far, I have not been able to
find much, and unfortunately I have zero personal experience in this area.
Thanks in advance for any help you can offer,
Matt
--
Matthew Nicholas
Medical Scientist Training Program Student
Laboratory of Arne Gennerich
Department of Anatomy and Structural Biology
Albert Einstein College of Medicine
Forchheimer Building, Room 628
1300 Morris Park Avenue
Bronx, New York 10461
718.430.3446
[log in to unmask]"
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