white beam with NO dichros?

[allthatwhichis]

Whats wrong with Coherent?

When your 40, looking for a wife, looking at adopting a kid, your attitude towards "giving it away" will change. I have documentation that it works, and that was hard to come by. I've been doing this for 20 years. I do like to get paid once in a while.

Neat problem for me, if I post a "fraction" of the details, some one here will clone it. I'm probably the champion "Giver Awayer" on this forum because I love the industry. But if its cutting edge, I'm keeping it.



Steve

If anybody should be allowed to make a few dollars on an idea its Steve, especially if it is cutting edge, or not already in the public view. Steve is always down to give out freebies and, in my opinion even better, he knows when he should give out freebies in a non-public fashion.

Hope to see you in a month Steve!

[ImageLight]

Hope to see you in a month Steve!

Yeah.. Me too! It just wouldn't be the same without you my friend.

[planters]

Wait a minute. No one is suggesting that he isn't a nice guy or that he hasn't been helpful in the past. Rather, the origin of this thread was a lighthearted inquiry about alternative methods for combining diodes with fibers. There are all kinds of trade offs when playing with these things ie. beam quality,stability, loss and cost. The suggestion that this is very doable, but that to find out how you have to pay a lot and keep it secret is like saying I heard this great joke, but well I can't tell it to you. Arghh.

[mixedgas]

Loss less then 10% per launched laser up to six diodes launched. Less loss if the end of the fiber is AR coated.
Stability excellent, mode scrambling is applicable for multiple wavelengths.

Steve

[steve-o]

Are you bringing it to SELEM, Steve?

[mixedgas]

Selem, no. I'm Serious on this one. Need 2 see a checkbook for this technology.

Steve

[steve-o]

Makes me wish I was rich. I'm just a po'-boy.

[andythemechanic]

Actually fiber coupling isn't that difficult. Just lay all the beams next to each other in a knife edging setup and focus them onto the fiber. Make sure that the focused beams are within the acceptance angle of your fiber (beam diameter/focal length< NA of fiber). Use an achromatized lens. Voila. All big Laser companys do that all the time. The beam which exits the fiber will be much more homogeneous then the beam that entered, although, depending on how you couple not necessary perfect.
The drawback: fiber coupling decreases the beam quality (or increases beam parameter product). That means that you will get a beam which will be bigger of have higher divergence than before.
Just an example a fiber with 50µm core and 0.22NA (standard multimode fiber) gives you a beam parameter product of 5.5mm mrad which means in order to get a divergence of 1mrad (half angle) you will have a beam radius of 5.5mm or for 1mrad full angle a beam of 22mm diameter. And thats already a small fiber! That physics can't be beat.

Andreas

[kecked]

Would it not be simpler to dope the fiber and figure a way to make it a cavity so that it naturally lases at three wavelenghts at the same time. I think I've seen something like this done.

[mixedgas]

I priced the fiber and optics for the Pr doped fiber lasers last week. The cost is prohibitive

Steve .