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Old 11-21-2014, 12:02 AM #1
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Default Why can't 980nm be frequency-doubled?

Excuse my idiocy!

I'm just wondering why 980nm isn't easily frequency doubled into 490nm like 1064nm is into 532nm. Is there not a proper crystal to do it?


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Old 11-21-2014, 01:24 AM #2
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Default Re: Why can't 980nm be frequency-doubled?

If I remember correctly, it's because the efficiency of the doubling crystal (KTP) drops to uselessness after 500nm. I read that somewhere around here.
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Old 11-21-2014, 01:44 AM #3
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Default Re: Why can't 980nm be frequency-doubled?

Quote:
Originally Posted by Sta View Post
Excuse my idiocy!

I'm just wondering why 980nm isn't easily frequency doubled into 490nm like 1064nm is into 532nm. Is there not a proper crystal to do it?
It can but the crystals and coatings required don't come cheep.

My protera produces 488nm by the direct inner cavity doubling of 976nm through a KNBO3 crystal
KNBO3 can also work at doubling 980 to 490 In fact IIRC a member here on the forum has done it. I'll give him a pm and see if he would like to chime in.
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Old 11-21-2014, 03:23 AM #4
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Default Re: Why can't 980nm be frequency-doubled?

It can be done with BiBO, but direct SHG
from a diode is problematic. There only a
few modules around that do it. There are
wavelengths close to that that are more
commonly done using vanadate. LBO and BBO
will also work, but they must be inside a
sealed chamber because they absorb
atmospheric moisture.
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Old 11-21-2014, 01:58 PM #5
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Default Re: Why can't 980nm be frequency-doubled?

You can do it, but you don't see them around because its not producing any wavelength that anybody wants. Plus as I understand it you need to perform some diode correction.

It's actually not as bad as you'd think. I can probably get a functional module for ~500-700 bucks.
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Old 11-21-2014, 05:05 PM #6
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Default Re: Why can't 980nm be frequency-doubled?

Quote:
Originally Posted by ZRaffleticket View Post
You can do it, but you don't see them around because its not producing any wavelength that anybody wants. Plus as I understand it you need to perform some diode correction.

It's actually not as bad as you'd think. I can probably get a functional module for ~500-700 bucks.
For not a whole lot more than that, you can get a 490nm single mode diode.
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Old 11-21-2014, 07:58 PM #7
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Default Re: Why can't 980nm be frequency-doubled?

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For not a whole lot more than that, you can get a 490nm single mode diode.
uh...where? Unless you are referring to the 488 diodes, which are several thousand $, not several hundred.
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Old 11-21-2014, 08:13 PM #8
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Default Re: Why can't 980nm be frequency-doubled?

Then this guy, Lazeerer, must be about the richest guy ever.

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Old 11-21-2014, 09:09 PM #9
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Default Re: Why can't 980nm be frequency-doubled?

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Originally Posted by crazyspaz View Post
uh...where? Unless you are referring to the 488 diodes, which are several thousand $, not several hundred.
I am.

And they're not "several thousand", they're a little bit over one thousand.

And that's "not a whole lot more" than $700.

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Old 11-21-2014, 09:36 PM #10
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Default Re: Why can't 980nm be frequency-doubled?

I think I won't ever touch a 488nm diode!
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Old 11-21-2014, 10:59 PM #11
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Default Re: Why can't 980nm be frequency-doubled?

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I think I won't ever touch a 488nm diode!
Give it 5 years, you might not be saying that^ then.

(Although for you, maybe 8yr.)
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Old 11-21-2014, 11:01 PM #12
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Default Re: Why can't 980nm be frequency-doubled?

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Give it 5 years, you might not be saying that^ then.
Well at least if I do, I won't use a drill press on it.
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Old 11-22-2014, 12:03 AM #13
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Default Re: Why can't 980nm be frequency-doubled?

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Well at least if I do, I won't use a drill press on it.
Give it 15 years and you will be using drill presses on $5 488nm diodes.
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Old 11-22-2014, 12:08 AM #14
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Default Re: Why can't 980nm be frequency-doubled?

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Originally Posted by rhd View Post
I am.

And they're not "several thousand", they're a little bit over one thousand.

And that's "not a whole lot more" than $700.

Eh? I can only assume you are referring to the Osram diodes, but those aren't for sale anywhere.
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Old 11-22-2014, 01:29 AM #15
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Default Re: Why can't 980nm be frequency-doubled?

Now i wasn't aware of this diode development. Ah well, I can't afford it either way. Maybe when the price goes down. A lot. College is expensive
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Old 11-23-2014, 09:25 PM #16
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Default Re: Why can't 980nm be frequency-doubled?

Not very useful, but relevant to the topic: Confirmed cheap multi-line 980nm/490nm pen

rhd, do you also have a source for the 495nm or was that a one of a kind?
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