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Old 07-14-2013, 05:18 AM #17
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Default Re: I got the power....!!!

Quote:
Originally Posted by norbyx View Post
The LPM is fine, I tested it with all my other lasers and it is just on track. When I did this test I just had my other He-Ne Aerotech on the side, and switching from one laser to the other the readings where right on. The aerotech measured at just around 6mW that was what it should be. Also before it got shipped out the Rigel 6 was measured giving the power readings that where expected. So the LPM is fine.
Now on the shape of the beam, well let me tell you that the dot is quite awful, it is way worse than the Aerotech, I don´t really know if a single mode laser can become a multimode from some bumping around during transportation but it sure doesn´t look like its nice and clean.

Maybe someone can bring some light to this.....
A laser in TEM00 produces less power than a laser in a higher order mode.

Why?

The higher order mode allows the laser to gain in more of the cavity - so it ultimately outputs more power. So, if the mirrors became slightly misaligned, it could net you a power increase like what you see. Many of the higher powered green lasers coming out of China in recent years owe that power to crazy high-order transverse modes.

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Old 07-14-2013, 05:27 AM #18
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Default Re: I got the power....!!!

Well I will try to clean the front mirror since to be honest I didn´t try that, the Qtip was there just because I had one laying in the table, but peronally I don´t think it will change much.
On the other hand knowing how a HeNe laser works shouldn´t the power be topped with the mirrors perfectly aligned? I mean I have seen various videos where with HeNe lasers and external mirrors if they are just a tenth of a degree out of alignment they loose power... so how could it gain power from a misalignment?
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Old 07-14-2013, 05:32 AM #19
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Default Re: I got the power....!!!

It's not that the laser is misaligned, per se. I'm saying the alignment has changed.

It's a fairly simply concept - if you use more of the gain medium, you will get more laser power. To use more of the gain medium, you have to change the way the laser resonates. To change the way it resonates, you have to change the alignment. You'll get increased power at the cost of beam quality.

With regards to the halo around the beam, cleaning the OC will help, but I would recommend against using Q-tips. They cotton might have abrasive bits in it that could damage the mirror and make the problem worse.

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Old 07-14-2013, 05:37 AM #20
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Default Re: I got the power....!!!

Well I could try with a microfibre cloth... that should work better. I will try tomorrow if I get to have some spare time, even if it is sunday I still have a ton of stuff to do.
Anyhow I am quite happy with the lasers as they are, they work quite nicely and even if they were kind of expensive to be just red 633, at least they do work fine.
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Old 07-14-2013, 05:40 AM #21
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Default Re: I got the power....!!!

Also keep in mind, a gas laser that doesn't run in TEM00 can be beautiful.

Here's my old multiline argon laser at idle:



And at full current, suddenly TEM01:





The shorter wavelengths ran in the most beautiful, perfect TEM01 I'd ever seen. I've never seen any other laser like that one.

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Old 07-14-2013, 05:43 AM #22
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Default Re: I got the power....!!!

Could it have become a multiline laser? That would be interesting.
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Old 07-14-2013, 05:51 AM #23
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Default Re: I got the power....!!!

You'd need new mirrors with different coatings for that to happen. I'm pretty sure that didn't happen during shipping.

That being said, helium-neon doesn't have a lot of gain on the non-red wavelengths, and can't really run multiline in any sort of interesting way (i.e. red and another color). There are tubes made commercially that produce two IR lines, or a red and IR line.

640nm can lase weakly alongside 632.8nm, but you probably wouldn't notice it. Similarly, occasionally an orange line can show up weakly in a yellow laser. These examples, however, would be due to manufacturing error rather than design.

Your HeNe just exhibits the telltale signs of an altered alignment.

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Old 07-14-2013, 06:05 AM #24
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Default Re: I got the power....!!!

Well Trevor let me thank you for all the given information. I would rep you if I could but the system just won't let me. I will do as soon as I can...
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Old 07-14-2013, 05:45 PM #25
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Default Re: I got the power....!!!

In the warmup process, if I apply pressure to the mirrors on my REO, it will switch in and out of SL 612 and ML with 594/604/612.

I haven't heard of 640 from anything other than a Raman, given it IS a Raman line.
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Old 07-14-2013, 05:49 PM #26
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Default Re: I got the power....!!!

Quote:
Originally Posted by bloompyle View Post
In the warmup process, if I apply pressure to the mirrors on my REO, it will switch in and out of SL 612 and ML with 594/604/612.

I haven't heard of 640 from anything other than a Raman, given it IS a Raman line.
Want to take a video? How stable is the output? How many lines are present at once?

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Old 07-14-2013, 07:02 PM #27
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Default Re: I got the power....!!!

I have a thread all about my 2 Multilines. Check my sig

I have one stable with 594/604 and another stable with 594/604/612.

They move warmup to multiline in seconds. Just in the beginning, I have to do that for it to lase 3.

Noticed it when I was tinkering with it, I didn't understand the HeNe process just yet, so I was trying to put a perfectly perpendicular mirror on one side to double the output. Silly, yes, but I was new... Anyway, I then tried cleaning the HR and noticed the lines would come and go. So a simple movement of a fraction of a millimeter, can cause spectacular things to happen. It stables out to all 3 lines in a couple minutes max anyway. My REO is my most unique HeNe. People love seeing 3 lasers at once, and orange.
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Old 07-15-2013, 12:57 AM #28
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Default Re: I got the power....!!!

Quote:
Originally Posted by Trevor View Post
Also keep in mind, a gas laser that doesn't run in TEM00 can be beautiful.

Here's my old multiline argon laser at idle:



And at full current, suddenly TEM01:





The shorter wavelengths ran in the most beautiful, perfect TEM01 I'd ever seen. I've never seen any other laser like that one.

Trevor
I have a ML argon that gives over 200mW of beautiful TEM10 (looks like a donut)
I also have a high powered Hene in which the output looks like a complex tapestry
Here's a HeNe that is hopping between complex modes



Peace,
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Old 07-15-2013, 01:03 AM #29
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Default Re: I got the power....!!!

I remember almost buying that HeNe from you... thanks for chiming in.

Also, bloomie, interesting! From everything I'd read on Sam's Laser FAQ it seemed like those couldn't exist... and it turns out you bought those from Dr. Sam himself.

Looks like I need to dive back into the FAQ...

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Old 07-15-2013, 01:07 AM #30
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Default Re: I got the power....!!!

The REO was bought from Dave.

Actually, I have 3 MLs. I forgot to mention the 6 line Raman

The 612 and 650 lines go nuts when warming up, blitzing through modes like nothing, it'll morph around and sit at a different mode a second before it warms up. Soft seals
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405nm 500mW
442nm 15mW Melles Griot HeCd
445nm 1W
455nm 100mW LaserBTB
457nm Tunable OMNI 532
465nm Tunable OMNI 532
467nm 1.8W NDB7675
472nm Tunable Omni 532
473nm 2x 100mW Melles Griot lab heads w/ PSUs
476nm Tunable OMNI 532
488nm Single line 35mW
496nm Tunable OMNI 532
502nm Tunable OMNI 532
514nm Tunable OMNI 532
520nm 40mW MSV2
532nm Various pointers
543nm GreeNe 2mW
568nm ~20mW ArKr whitelight line
589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
604nm 2x <1mW multiline
609nm Ne Penning mixture Ar line from REO 612nm
612nm HeNe 1mW ML 4 line; Raman 6 line
629nm <1mW Raman 6 line
633nm 1-4mw red HeNe
635nm Raman 6 line
638nm 20mW single mode
640nm Raman 6 line
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650nm Raman 6 line
658nm LPC-826
685nm 20mW
808nm Modded NewWish pen


HeNe/gas reference thread
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Old 07-15-2013, 02:48 AM #31
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Default Re: I got the power....!!!

Here's my little green HeNe hopper.


Bloom Can you get all your gassers going at the same time for photo shoot. That would be epic.
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Old 07-15-2013, 03:20 AM #32
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Default Re: I got the power....!!!

That's 2 Argons and 6 HeNe..I'd blow a breaker lol. Plus I only have 3 HeNe psu's. One is designed for the Raman, so the other 2 are just interchangeable. Though I have a 12VDC somewhere..

I will be taking some "rainbow" shots if I can snag another psu. Showing the various greens I have, and the visible HeNe spectrum (minus the Raman).

My current gas related media goal is to get a decent beamshot of 501.7nm. But that's enough thread jacking for me

Feel free to post questions in one of my gas threads my Raman thread has some pretty sweet new pics
__________________
"These things we do.
That others may live."

405nm 500mW
442nm 15mW Melles Griot HeCd
445nm 1W
455nm 100mW LaserBTB
457nm Tunable OMNI 532
465nm Tunable OMNI 532
467nm 1.8W NDB7675
472nm Tunable Omni 532
473nm 2x 100mW Melles Griot lab heads w/ PSUs
476nm Tunable OMNI 532
488nm Single line 35mW
496nm Tunable OMNI 532
502nm Tunable OMNI 532
514nm Tunable OMNI 532
520nm 40mW MSV2
532nm Various pointers
543nm GreeNe 2mW
568nm ~20mW ArKr whitelight line
589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
604nm 2x <1mW multiline
609nm Ne Penning mixture Ar line from REO 612nm
612nm HeNe 1mW ML 4 line; Raman 6 line
629nm <1mW Raman 6 line
633nm 1-4mw red HeNe
635nm Raman 6 line
638nm 20mW single mode
640nm Raman 6 line
647nm ~10mW ArKr whitelight Kr line
650nm Raman 6 line
658nm LPC-826
685nm 20mW
808nm Modded NewWish pen


HeNe/gas reference thread

Last edited by bloompyle; 07-15-2013 at 03:23 AM.
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