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Old 04-25-2013, 03:23 PM #1
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Default adjustable frequency diode?

Anyone aware of any research in this direction? A pointer with a wavelenth from 405nm t0 680nm would be great..


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Old 04-25-2013, 04:17 PM #2
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Default Re: adjustable frequency diode?

Thats a huge swing. An ECDL has adjustable frequency. But no where near a range like you've mentioned.
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Old 04-25-2013, 06:45 PM #3
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Default Re: adjustable frequency diode?

ECDLs tune by fiddling with the operating temperature and they adjust within a range of like +/- 3nm, or something like that. Someday, tunable diode across the entire spectrum may be readily available.







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Old 04-25-2013, 07:50 PM #4
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Default Re: adjustable frequency diode?

At best you can get a tuneable ArKr laser which will have lines in blue, green, yellow, and red, but I think to get all the lines you need a double brewster tube with interchangeable HR and OC pairs.
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Old 04-25-2013, 10:49 PM #5
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Default Re: adjustable frequency diode?

Are Krypton Ion lasers tunable to ANY wavelength, or only those wavelengths it's capable of lasing at? I did not think these lasers were infinitely tunable, only tunable (more like selectable) to the lines available.

Conversely, ECDLs are be infinitely tunable within their (narrow) range of operation.

I welcome any feedback to help me get this right in me wee little head.
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Old 04-25-2013, 10:52 PM #6
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Default Re: adjustable frequency diode?

Sorry did not mean to imply they are tunable to any wavelength. They just have many, many lines through the visible spectrum, from UV through NIR. I think the highest gain ones have several lines in deep blue, central green, upper yellow, and red.
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Old 05-01-2013, 12:03 AM #7
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Default Re: adjustable frequency diode?

So is this similar to projecting an IR beam through a prysm cube to get the different colors?
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Old 05-01-2013, 12:13 AM #8
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Default Re: adjustable frequency diode?

IR doesn't do that but if you mean sunlight, then yes.
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Old 05-01-2013, 02:08 AM #9
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Default Re: adjustable frequency diode?

So, then how do you "tune" them to the different wavelengths. I'm probably in over my head on this one, but how else are you gonna learn? I'm assuming you have to turn off the power to go to the other wavelength.
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Old 05-01-2013, 02:20 AM #10
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Default Re: adjustable frequency diode?

We're still referencing an ArKr Ion laser here right? It normally produces all of the lines simultaneously. You either let them all out at once or you filter out the ones you don't want. One with an intravacity prism would have a prism inside the cavity which moves the line you want into alignment with the HR mirror so it gets more than single pass gain. This is normall called a Tunable ArKr laser as you tune the cavity to provide gain to the desired wavelength line. They are harder to produce than a standard multiline ArKr though. You don't turn them off to tune, there just isn't enough gain to get any real lasing when the prism is out of alignment, so you get no beam.
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Old 05-01-2013, 10:32 AM #11
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Default Re: adjustable frequency diode?

Ok. Can you tell me what an HR mirror is and is it similar to the mirror/ lens in a dvd player? Also, do you have a picture of diagram of what we are discussing?
Thanks
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Old 05-02-2013, 02:11 AM #12
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Default Re: adjustable frequency diode?

While I appreciate your thirst for knowledge and willingness to learn, we're reaching the point where it would take a large amount of effort (and time) on my part to explain the concepts and physics behind the operation of lasers. The short answer is no, it is not like any lens you have encountered before. Likewise, the ArKr laser is a gas laser about the size of a small counter top, not a portable device. Diode based lasers are only tunable over such a small range that the eye cannot tell the difference in color. Truly tunable lasers are very large systems.

HR mirror = "high reflect" mirror
OC = output coupler mirror or partial transmittance mirror

The info you need can be found by searching the internet for "how does a HeNe laser work".
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Old 05-02-2013, 03:16 AM #13
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Default Re: adjustable frequency diode?

Grab a particle accelerator and build a free electron laser, they can be tuned to any wavelength
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Old 05-02-2013, 10:32 AM #14
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Default Re: adjustable frequency diode?

Thanks for the reply. Sigh. Guess I'll have to get some books and read. Not that I'll ever get something that big, but it still is intresting to know. When I first stumbled upon this site it was just to do one build maybe 2, but know I am pre-planning several. And I'm also getting hooked on Flaminpyro's niche of pyrotechnics. Not enough time and money.
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Old 05-02-2013, 11:00 PM #15
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Default Re: adjustable frequency diode?

Hobby can be expensive, but reading is free

Reading and research gives you time to save up, too
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Old 05-03-2013, 07:01 AM #16
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Default Re: adjustable frequency diode?

So what is the difference between a tunable laser system and a MEMS projector like the one below? i mean you are technically combing three RGB lasers, but hey its tunable....

Mini-projector

are the colors that come out something like not a true(can't think of the technical term to describe it) sinusoid waves?
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