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Anyone know the wattage/current of the IR diode in a PGL-589-50mW ?

rhd

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I recently picked up a non-working 589 50mW (spec) PGL. The IR diode works fine. The driver is damaged, so I cannot directly determine what current it was running the IR diode at.

I would like to know roughly what I can expect in terms of this IR diode's power. Either the wattage (from which I can estimate an appropriate current) or the current itself, would be helpful.

Tailcap current will be useless here, because these units have an integrated TEC that the driver regulates up/down constantly based on temperature feedback.
 





rhd

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Sorry to bump - but doesn't anyone have an educated guess?
 
Kalahari

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Bumping for rhd, I want to see this next unique creation!

Can you put IR diode through the crystal set and rise the current until it is stable at 50mw on your LPM, or am I wrong and this is not worth trying?
 
rhd

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Kalahari said:
Bumping for rhd, I want to see this next unique creation!

Can you put IR diode through the crystal set and rise the current until it is stable at 50mw on your LPM, or am I wrong and this is not worth trying?
Click to expand...

Sure - but my sense is that I'd probably see 50mW of output at somewhere around 500mW of IR input. So I might be wasting a lot of potential.
 
Blord

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I would guest 1W IR diode. The 589nm use a non-major spectral line of the crystal set so it need a lot of IR to generate just 50mW of power. Unlike the 532nm dpss system which use a major line. That is why green can be much more powerful than 478nm or 589nm. Or something like that :D
 
rhd

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Blord said:
I would guest 1W IR diode. The 589nm use a non-major spectral line of the crystal set so it need a lot of IR to generate just 50mW of power. Unlike the 532nm dpss system which use a major line. That is why green can be much more powerful than 478nm or 589nm. Or something like that :D
Click to expand...

I think you'd need a lot more than 1W of 808 to produce 50mW + (this is CNI, so it really is 50mW +) of 589.

Wikipedia says 3% of the pump diode's power gets turned into 589. I'm not sure whether they're suggesting 3% of the pump's OUTPUT power, or it's INPUT power.

If it's OUTPUT power, then 50mW would require about 1.666 W of input.

So perhaps this is a 2W pump?
 
Blord

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Or you have a very efficient crystal set. How does the diode looks like anyway ?
 
rhd

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Blord said:
Or you have a very efficient crystal set. How does the diode looks like anyway ?
Click to expand...

Basically like a typical C-Mount. It's a little more "perfect" looking than any C-Mount I've seen before. IE, perfectly sharp edges, absolutely flawless metal surfaces. Other than that though, it's just a normal C-Mount.
 
aryntha

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I wish I did have a guess on this... I really want to see ths 589 -- or any 589 -- come back to life. I don't think anyone's repaired one yet.
 
Blord

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Wow, these yellow lasers are very inefficient dpss systems. It need a decent heatsink for sure.
 
qumefox

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aryntha said:
I wish I did have a guess on this... I really want to see ths 589 -- or any 589 -- come back to life. I don't think anyone's repaired one yet.
Click to expand...

I gave up on mine a long time ago. I still think when they die, it's moisture related unless you just get super lucky and it's a pump failure... So there's no 'bringing them back' generally without new crystals.
 
aryntha

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Which is why i always keep my 589s in plastic containers with silica gel now. I should find something that seals tighter though.
 
rhd

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aryntha said:
Which is why i always keep my 589s in plastic containers with silica gel now. I should find something that seals tighter though.
Click to expand...

Judging by the module inside the PGL-589-50mW I opened, I'm pretty sure the module itself was completely air-tight.
 
qumefox

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I thought that about my GPL 589 as well, but they're dying for some reason, and it's not related to pump deaths or alignment problems. Either of which SOMEBODY would have had some luck in repairing by now, even if it was at a lower output.

One of my last ditch efforts with my GPL was transplanting the entire cavity into one of my 473 labby housings with a 5W pump.. Even then I never managed to get even a hint of yellow.

My assumption is that whatever either gain medium, or summing crystal they're using is EXTREMELY hygroscopic.
 
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