Replacing the C-Mount in a 532nm - FAC or no FAC?

If I'm trying to replace the C-Mount IR in a 532, do I need the diode to have a FAC? to NOT have a FAC? or is it dependant on the host's focusing for the 532?

My understanding is no-FAC is needed for the IR - but I'm not 100% on that.

I guess you'd need the new diode to have FAC if the old one did.:thinking:
You'd likely also need to mount a diode that has the exact same specs,
wavelength, beam, in the exact same position, distance, orientation (polarization),
so the crystal does think it is being pumped in the exact same way as before.

Otherwise the output will likely be much lower....

I'm just talking out of my ass, imagining it, might be way off....

Since it's a C-Mount:
- I think the allignment will almost take care of itself.
- Similarly, I would think that polarization should be the same automatically.
- Regarding wavelength, it should just be an 808.

My thinking is that since the diode is used as a pump, there's no reason to need a FAC. After all, we're not retaining the diode's beem specs in a DPSS process, are we? Seems to me like a FAC would be a waste. But I don't know.

When replacing pump diodes, I normally have to realign all the optics and crystals, too. Minor differences in orientation, beam profile, focal lengths, etc. can sometimes make a huge difference in output.

Your first task is to determine what the specs. on the original diode were.
Try to get a diode from a reliable source. If the pump wavelength is a nanometer or two off, it could make the difference between shitty output and great output.

Edit: Re: Above.
FAC is not a waste. Part of getting optimal output from your DPSS system is how the medium is pumped.
The ideal configuration is to collimate the pump light so that the focal point is in the center of the crystal. Just blasting it with a divergent cone of light is the most inefficient way to do it.
Getting the crystals as close as possible to the diode's emitter or minimizing the divergence of the pump light is going to get you more out of the crystals.

Interesting -
It's not a high-end pointer - cheap Chinese 250mW to begin with. I don't know where to purchase IR diodes from, so I've resorted to eBay:
808nm diode - to-18, 200mw, 300mw, 500mw items - Get great deals on Business Industrial, Electronics items on eBay.com!

Any of those make sense? Have a more reliable source?
I think the original was running somewhere around 700mA.