[Q] back reflection from fiber collimator
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Posted by laser on August 19, 2007, 11:51 pm
Please log in for more thread options fiber collimator ( back reflection dependance on types of fiber, lens, coating, anlge, etc.), would you please share them with me? | ||||||||||||||||||||||||||||
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Posted by Lostgallifreyan on August 20, 2007, 3:42 am
Please log in for more thread options I considered Brewster's angle, and went hunting, and found this: http://www.freepatentsonline.com/4986661.html Googling for [fibre coupled laser brewster angle] might get you some good stuff. That linked page is a patent describing a combination of AR coating and less-than-Brewster to get good power and minimal reflection. There might be other schemes, and searching in the context of Brewster's angle seems likely to find some more. | ||||||||||||||||||||||||||||
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Posted by Pat B. on August 20, 2007, 3:01 pm
Please log in for more thread options >
> > If you know any literature(s) which covers a back reflection from
> > fiber collimator ( back reflection dependance on types of fiber, lens, > > coating, anlge, etc.), would you please share them with me? >
this:http://www.freepatentsonline.com/4986661.html
> I considered Brewster's angle, and went hunting, and found >
> Googling for [fibre coupled laser brewster angle] might get you some good > stuff. That linked page is a patent describing a combination of AR coating > and less-than-Brewster to get good power and minimal reflection. There > might be other schemes, and searching in the context of Brewster's angle > seems likely to find some more. Confused, Why back reflection concerns, of course you want to minimize reflections. You will also get reflections from the cleaved or polished output end of fiber as well as both surfaces of the collimating lens. The best you can do is AR coat the fiber end, and both sides of the lens. Are you worried about a beat frequency or something like that? These reflections are minimal. Is the cost incurred to create a brewster scheme or something more exotic justify end result? Why is it (back reflection) such a big concern to you? | ||||||||||||||||||||||||||||
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Posted by Helpful person on August 20, 2007, 3:43 pm
Please log in for more thread options >
> > > > If you know any literature(s) which covers a back reflection from
> > > fiber collimator ( back reflection dependance on types of fiber, lens, > > > coating, anlge, etc.), would you please share them with me? >
> > I considered Brewster's angle, and went hunting, and found
this:http://www.freepatentsonline.com/4986661.html
>
> > Googling for [fibre coupled laser brewster angle] might get you some good
> > stuff. That linked page is a patent describing a combination of AR coating > > and less-than-Brewster to get good power and minimal reflection. There > > might be other schemes, and searching in the context of Brewster's angle > > seems likely to find some more. >
> Confused, Why back reflection concerns, of course you want to minimize > reflections. You will also get reflections from the cleaved or > polished output end of fiber as well as both surfaces of the > collimating lens. The best you can do is AR coat the fiber end, and > both sides of the lens. Are you worried about a beat frequency or > something like that? These reflections are minimal. Is the cost > incurred to create a brewster scheme or something more exotic justify > end result? Why is it (back reflection) such a big concern to you? Back reflections are a concern because if they re enter the cavity they will effect the gain in an unpredictable manner. www.richardfisher.com | ||||||||||||||||||||||||||||
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Posted by Pat B. on August 20, 2007, 6:58 pm
Please log in for more thread options >
> > > > > > > > If you know any literature(s) which covers a back reflection from
> > > > fiber collimator ( back reflection dependance on types of fiber, lens, > > > > coating, anlge, etc.), would you please share them with me? >
> > > I considered Brewster's angle, and went hunting, and found
this:http://www.freepatentsonline.com/4986661.html
>
> > > Googling for [fibre coupled laser brewster angle] might get you some good
> > > stuff. That linked page is a patent describing a combination of AR coating > > > and less-than-Brewster to get good power and minimal reflection. There > > > might be other schemes, and searching in the context of Brewster's angle > > > seems likely to find some more. >
> > Confused, Why back reflection concerns, of course you want to minimize
> > reflections. You will also get reflections from the cleaved or > > polished output end of fiber as well as both surfaces of the > > collimating lens. The best you can do is AR coat the fiber end, and > > both sides of the lens. Are you worried about a beat frequency or > > something like that? These reflections are minimal. Is the cost > > incurred to create a brewster scheme or something more exotic justify > > end result? Why is it (back reflection) such a big concern to you? >
> Back reflections are a concern because if they re enter the cavity > they will effect the gain in an unpredictable manner. > > www.richardfisher.com Your statement is true, however, you need more information before making a broad statement like that. I know that is possible but that is why I asked the question. VERY few cavity designs will be adversely affected by low power reflections. As usual...more information is needed to resolve question. Scope too broad. | ||||||||||||||||||||||||||||
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> fiber collimator ( back reflection dependance on types of fiber, lens,
> coating, anlge, etc.), would you please share them with me?
>
>