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Old 07-12-2013, 03:43 AM #49
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Default Re: 8 line TUNABLE argon

That's what we were talking about; diffraction mirrors.

I have a prism, the power loss is the worst of all due to the tons of lossy reflections coming out every side. A mirrored prism maybe.


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Old 07-12-2013, 03:43 AM #50
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Default Re: 8 line TUNABLE argon

Aren't those reflecting diffraction gratings? I thought we were talking about the same thing.

EDIT: Sig beat me to it!

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Old 07-12-2013, 04:42 AM #51
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Default Re: 8 line TUNABLE argon

I don't think you understand. Most of the beam is reflected like it would be off of a mirror. Only a small part of it is diffracted to either side. Point a laser at a CD to see what I mean.
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Old 07-12-2013, 04:49 AM #52
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Default Re: 8 line TUNABLE argon

That's unfortunate I was looking at some gratings on ThorLabs and they claimed efficiencies between 45-65%. Is that inaccurate?
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Old 07-12-2013, 05:38 AM #53
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Default Re: 8 line TUNABLE argon

What would happen if you shot the output of a ml argon through a prism to separate the lines, then through a slit with a perfectly aligned partial mirror on the other side? Am I correct thinking it would create an external cavity for one individual line and cause the line selected by the slit to be amplified more than the others?

Is that essentially how your tunable works bloom?
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Old 07-12-2013, 01:18 PM #54
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Default Re: 8 line TUNABLE argon

I see how that would work.

I am not the one to ask about optics. The lacks of knowledge in optics is the big thing holding me back from building a tunable HeNe. I know there is a prism, and mirrors, but I'm not sure how it works exactly. If I visualize it all though, that makes sense. Rotating the prism would offset the output horizontally, allowing a different line to pass through. That being said, there's a lot of "down-time" between lines. Up to over a half turn between lines. So I'm not sure how the line seems to come out at the same spot every time. With these "ghetto" setups, you have a skewed beam, for me, the beam/dot hits the same point with every line.
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Old 07-12-2013, 03:15 PM #55
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Default Re: 8 line TUNABLE argon

Bloom, my guess is that the screw is connected to a gear which turns the prism slowly for finer tuning. I would bet that the prism+slit+mirror is how it works. It just has to have a broadband coating is all.
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Old 07-12-2013, 03:42 PM #56
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Default Re: 8 line TUNABLE argon

I imagine in his the prism comes before the output coupler so power isnt wasted by allowing the other lines to lase at all. I dont think you would even need a slit if it was like this.
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Old 07-12-2013, 08:34 PM #57
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Default Re: 8 line TUNABLE argon

Theres a diagram somewhere about it. There is a prism in front of the HR mirror in the back and when you rotate the prisim it allows one line to lase at a time. Get slightly offset from that line and it dims. Too far and ots dead untill you being the next line onto the HR mirror by rotating the prism more.
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Old 07-13-2013, 03:47 AM #58
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Default Re: 8 line TUNABLE argon

Yep, it's an intracavity prism that deflects the beams.
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Old 07-13-2013, 03:58 AM #59
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Default Re: 8 line TUNABLE argon

But prisms cause huge losses, do they not?
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Old 07-13-2013, 04:01 AM #60
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Default Re: 8 line TUNABLE argon

Yes but the intracavity beam is a couple orders of magnitude higher than the output beam. A 10mW HeNe has an intracavity beam power of up to 60W.
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Old 07-13-2013, 06:20 AM #61
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Default Re: 8 line TUNABLE argon

Prisms don't have big losses if the coating and angle are optimized.

Quote:
Originally Posted by benmwv View Post
What would happen if you shot the output of a ml argon through a prism to separate the lines, then through a slit with a perfectly aligned partial mirror on the other side? Am I correct thinking it would create an external cavity for one individual line and cause the line selected by the slit to be amplified more than the others?

Is that essentially how your tunable works bloom?
The prism is at the HR end. Depending on the alignment, a single wavelength is selected for amplification. This is the most efficient way to produce a single line besides changing the mirrors. Adding something intercavity allows power to go into generating other lines, but then throws them away.

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Originally Posted by Wolfman29 View Post
That's unfortunate I was looking at some gratings on ThorLabs and they claimed efficiencies between 45-65%. Is that inaccurate?
ThorLabs wouldn't have bad specs. The question is how they measure it. Is 35% lost to heat? Is 50% diffracted? I dunno.
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Old 07-13-2013, 06:55 AM #62
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Default Re: 8 line TUNABLE argon

That's what I was wondering.
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Old 07-14-2013, 01:40 AM #63
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Default Re: 8 line TUNABLE argon

About to purchase an optics book next week, actually about tunable laser optics specifically. Should be a good read.

I'll be by myself tonight, so I'll get some more pics up in a few
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Old 07-14-2013, 05:18 AM #64
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Default Re: 8 line TUNABLE argon

Quote:
Originally Posted by bloompyle View Post
About to purchase an optics book next week, actually about tunable laser optics specifically. Should be a good read.

I'll be by myself tonight, so I'll get some more pics up in a few
Still interested in some pictures of the actual unit, and how it tunes the different wavelenghts....

Let us know.
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Laser physics Argón 488nm 90mw

Ebay Pen Style 532nm 40-80mW
Rick Trent 638nm 1.2w--Blord 1 Watt 638nm EDC laser Shadow GF1 (review)--05-LHR-991 MELLES GRIOT HeNe 16mW--AEROTECH ELECTRO OPTICAL OEM5R 7mW

Laserbee II 3.2 LPM.
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