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-   -   Newport Tunable HeNe (http://laserpointerforums.com/f43/newport-tunable-hene-86071.html)

hwang21 10-30-2013 02:03 AM

Newport Tunable HeNe
 
Not sure if this is rare or unexpected, but Newport has tunable HeNe's for sale, covering both 604nm and 612nm ranges: https://www.newport.com/HeNe-Lasers-...1033/info.aspx

This sounds like a very rare occurrence?

ARG 10-30-2013 02:18 AM

Re: Newport Tunable HeNe
 
Yours for only one payment of $6,000.00 :p

hwang21 10-30-2013 02:19 AM

Re: Newport Tunable HeNe
 
Well yes way out of my range but I thought tunables were extraordinarily rare? As far as I can tell no 604nm or 612nm HeNe's have been made or stocked by manufacturers for many years now... is this not the same for tunables?

SKeeZ 10-30-2013 02:21 AM

Re: Newport Tunable HeNe
 
REO Optical makes some, you can find them if you need them...

Edit: OMG REO is Newport...

ZRaffleticket 10-30-2013 02:24 AM

Re: Newport Tunable HeNe
 
You're right, they are extraordinarily rare. So are 488nm diodes, so are 577nm OPSL systems, and so are 607nm DPSS processes. They're all readily available, just extremely rare.

However they're still being produced by at least one other company right now. (I'm not a gas guy... I don't know)

hwang21 10-30-2013 02:35 AM

Re: Newport Tunable HeNe
 
I see. Well I'm pretty sure no company even manufactures 604nm and 612nm HeNe's anymore... obtaining one and seeing it working should be quite a journey :p

pschlosser 10-30-2013 11:28 AM

Re: Newport Tunable HeNe
 
Rare, perhaps.
Poor demand = poor supply.

SKeeZ 10-30-2013 03:59 PM

Re: Newport Tunable HeNe
 
as time goes on and i figure more things out, bloompyle's collection is looking INCREDIBLE.

bloompyle 10-30-2013 09:26 PM

Re: Newport Tunable HeNe
 
It's the same tube made by REO back in the day.

The REO LSTP.

It's a semi-standard tube with just the right gas fill, and pressure, to allow for lasing of all 5 standard lines between 543.5 - 632.8 (543.5, 594.1, 604.6, 611.8, and 632.8).

Sometimes you can get some stray raman lines, but they aren't advertised as being included. Similar to getting a multiline tube.

It's got a broadband OC on one end, and on the other you will find a littrow prism/HR coated broadband as well.

As you would expect from a regular prism, this prism also diffracts the light and places all the wavelengths in their correlating places of the spectrum. However, one face of this prism is coated HR broadband, so once this light is enters the prism and diffracts, it is also being reflected back through the tube.

The tuning takes place when this prism undergoes very precise rotation. By rotating the prism, you are allowing individual lines to resonate, thus gaining, throughout the cavity. Whereas the other 4 (or however many other lines remain) will collide with the bore walls and not have the opportunity to gain, thus no lasing will take place on these lines.

Very ingenious design, and is very similar on concept to other tuning designs. Whether it's an intra-cavity prism with external HR, or a littrow grating, they all work on the same principles.

It's on my must-have list, but not for a while. Aryntha has one, as Sam is selling a couple. A healthy one for $3k, and a couple others for a few hundred less that are either missing green, or have a long warmup, etc. I will eventually knuckle down and save for a few months to get one. Though it is not a pressing need currently.

As far as production, REO I believe still does it. As it's their laser, and you can still purchase it from their website. These are used in spectroscopy. When you need a laser capable of producing wavelengths over a tunable range, this is a fine option. It provides stable wavelengths, that change by fractions, of a fraction of a nm over warmup. These are used when you need to test a materials ability to absorb wavelengths, for instance in cavity ring down spectroscopy.

This is a science involving an external cavity using a Herriott Cell. This cavity resonates light within it in a ring-like patter. This external cavity is a vacuum sealed environment, with mirrors on both sides. One mirror has a hole in it for light to enter, and exit, and both mirrors are highly reflective.

This tube has a known spectral readout, as far as how it absorbs various wavelengths. They also know how long it takes for a pulse of light, at a certain power, to dissipate to nothing within the tube. How many resonations. When a gas is placed in the tube, they fire the laser pulse, and measure the new rate. They use this integer to identify the spectral qualities of various gases, and the rate at which they absorb various wavelengths.

Helium-Neon lasers are known to be used in this fashion, and I'd even put money on companies using this very laser.

crazyspaz 10-30-2013 09:47 PM

Re: Newport Tunable HeNe
 
sure would be an amazing piece to add to your collection, even if you aren't a "gas" guy!

bloompyle 10-30-2013 10:03 PM

Re: Newport Tunable HeNe
 
FYI: Research Electro-Optics = REO (right on the side of the laser).

hwang21 10-30-2013 10:17 PM

Re: Newport Tunable HeNe
 
I'm surprised that even the hobbyist tunable HeNe is still in the $3k range :eek:

hwang21 10-30-2013 10:47 PM

Re: Newport Tunable HeNe
 
Also, what would be a good price to pull the trigger on for a 612nm HeNe? Obviously pricing is different depending on output power, so how about 1-2mW?

EDIT: so it seems REO/Newport still produces an occasional tunable HeNe. But what about 604nm or 612nm HeNe's? I don't think anyone produces these at all anymore... am I wrong?

ultimatekaiser 10-30-2013 11:51 PM

Re: Newport Tunable HeNe
 
you're probably looking at something crazy for a 612. probably at least 800. there's few reasons to own one frankly, other than to just have the color. I almost bought one a while back, but I bought the argon instead.

bloompyle 10-31-2013 12:04 AM

Re: Newport Tunable HeNe
 
Quote:

Originally Posted by hwang21 (Post 1249378)
Also, what would be a good price to pull the trigger on for a 612nm HeNe? Obviously pricing is different depending on output power, so how about 1-2mW?

EDIT: so it seems REO/Newport still produces an occasional tunable HeNe. But what about 604nm or 612nm HeNe's? I don't think anyone produces these at all anymore... am I wrong?

All depends on output, and luck. Anywhere from $125 - $800 pending both of those conditions.

604.6nm is not, nor ever was, produced solely by itself. The only way to get 604.6nm is either from a multiline, or the tunable.

611.8nm isn't produced visibly. Meaning they aren't advertised. At least by REO anyway, the main leader in orange tubes. Though emailing MG, REO, Seimens, or Uniphase may lead somewhere lucky.

Those are the four companies that every sold 611.8nm HeNes.

Good luck! Ordering direct from the company will be VERY expensive. I recommend getting on Sam's good side, and scanning ebay.

SerpantSlayer 10-31-2013 01:04 AM

Re: Newport Tunable HeNe
 
A little out of my price range... :)


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