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Old 04-04-2011, 10:18 PM #1
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Question Pump wavelengths for KTP?

As the title suggests, what (if any) are compatible with pumping KTP?

Ive skimmed some papers which mention 755nm and 832nm. 1064nm is
the obvious choice which will be project 1, but want to experiment with
some of the other wavelengths even if inefficient..

These are the sets I got, but no datasheet or info included other than
what is labeled on the containers.






As usual, all comments welcome..

Thanks much


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Old 04-04-2011, 11:29 PM #2
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Default Re: Pump wavelengths for KTP?

1064 would be the obvious choice, but it -can- work with other pump wavelengths too. The problem is that the pump light needs to be extremely monochromatic, so pumping it with a laser diode is not possible. You could try pumping with 946 (a weaker Nd:YAG line) to get 473, though i doubt it will be efficient at all.
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Old 04-05-2011, 01:40 AM #3
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Default Re: Pump wavelengths for KTP?

Thanks for the info I was hoping there would be more possibilities...

I have 940 ~ 980nm 4W cmounts and corrective optics, maybe ill get lucky.

When you say that diodes cant do it, is it because they wander wavelength?
Is this something that a TEC could control?

I was thinking maybe try a 4W LD, chill it down and slowly increase the temp to
see what happens.

Im thinking start with 532 and try something different with the last one..
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Old 04-07-2011, 02:10 AM #4
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Default Re: Pump wavelengths for KTP?

KTP depends on resonant cavities for multipass to get enough energy in the crystal to double. Its very hard to single pass double anything unless its a high energy, very short pulse. Ie Qswitched yag.

You also need to angle tune and temperature tune the KTP for a given wavelength.

Steve
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Old 04-07-2011, 07:01 AM #5
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Default Re: Pump wavelengths for KTP?

Quote:
Originally Posted by LSRFAQ View Post
KTP depends on resonant cavities for multipass to get enough energy in the crystal to double. Its very hard to single pass double anything unless its a high energy, very short pulse. Ie Qswitched yag.

You also need to angle tune and temperature tune the KTP for a given wavelength.

Steve
If I also remember correctly KTP will not double below ~500nm without a drastic loss in efficiency due to the inability of it to be phase-matched below 500nm or so.

That would be the reason why it isn't used with 473 and 457nm systems- if it could, then, they would have.

Besides, as Steve said, they do like large, large amounts of intracavity power. Simply shooting a diode through them won't work (even assuming you could get it phase-matched correctly, that is) will get you extremely little (on the order of microwatts, maybe) to no output.

Remember even a 5mW pointer will have many watts of power circulating within the cavity; only some of this power is doubled and consequently 'released' from the cavity.
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Old 04-11-2011, 01:05 PM #6
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Default Re: Pump wavelengths for KTP?

Quote:
Originally Posted by wannaburn View Post
As usual, all comments welcome..
Only experiments or a direct email to Casix could reveal what for those crystals were made. As other mentioned the best lasers would be a Q-switched type to pump these crystals. The starting one is 1064nm to get 532nm (the Second Harmonic Generation, SHG). The next one is 532nm to get something in VIS-NIR through a parametric process (OPA and OPO)

Does a crystal have any number on it? Hopefully a phasematching angle
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