pump diode identification

[jeejeedr]

I'm trying to start up a dpss I pulled from a photolab.
So far no luck. I connected the power supply to the driver which I connected to the head. Then I put the correct signals to start up.
No luck

So I decided to not use the original driver and power supply and use a die4drive instead and just use the tec circuits (amazing piece of engeneering by shimadzu! diode, and each crysal is temperature controlled on its own and the pump diode is in a sealed chamber from the crystals).
To do this, I need to know to specs for the pump diode. It's a (very) low power one, that I know. And it is a c-mount. But that's it.
On the side of the diode the following is engraved: FVC269.
A search in google returned zero results.

So does anyone know what the numbers stand for or how to identify the diode or it's voltage and current?

[ElektroFreak]

If all you need is a replacement, then the exact specs of that diode are not necessary.

Once it is known what the rated output of that system should be, the correct replacement can be identified. All 808nm cmount diodes work on the same voltage (1.8-2.1V) and the current rating will be supplied with whatever diode you use as the replacement. Then all you need to know is if the diode needs to have FAC (fast axis collimation) or not.. (most do.)

[Junktronix]

That is the unit serial number on the side of the diode which does not give any information about the manufacturer or power level. If you know what the diode current should be, we can make a good guess as to the power. As ElectroFreak pointed out, it'a also important to get a diode with a FAC lens if the original has one installed. You need to look *very* close to see the FAC lens since it's just a tiny piece of ~80um (smaller than a human hair) fiber mounted across the output facet.

[ElektroFreak]

I actually just happen to have a good pic of a FAC lens on a cmount:



You can easily see the fiber glued across the face of the diode..

[jeejeedr]

Well, I know the output power: 0.5 mW. And a beam diameter of 0.4mm. The beam diameter is made using a pinhole. So I guess the power after the crystals is higher.
The reason why I would invest some time in it, is because I have exactly the same in a blue version. Hoping that the crystals can sustain a higher power, I'm planning on building a small desktop RGB projector for designing shows. I think this could be usefull.

My first step was to fire it up, measure the output without the pinhole, and then see if I could find out what power the crystals could survive to crank up the power a little bit.

So as I can not identify the current diode, It might be a good idea to drive the current diode from zero to the point where I get about 0.5mW output I think.

Does anyone know for those low power crystals what the power 'band' is they can cope with?

I'll try to take some photo's this week to show how this unit is build.

[ElektroFreak]

Your questions now require detailed pictures in order to answer properly. It would help to be able to see the system you're using.. I'm not sure what kind of diode (size, type) the unit uses. You are saying that the 532nm output is 1/2 milliwatt, correct?

[jeejeedr]

Here are some photo's.


This is one of the heads. You can see clearly that there are compartments seperated from each other.


This image show both compartments opened up.


This is the compartiment with the pump diode.



This is the crustals compartiment.

[jeejeedr]

Your questions now require detailed pictures in order to answer properly. It would help to be able to see the system you're using.. I'm not sure what kind of diode (size, type) the unit uses. You are saying that the 532nm output is 1/2 milliwatt, correct?

Output after the pinhole is indeed 1/2 mW. But this is after the pinhole. I suspect a lot of power is wasted. the pinhole is really just a pin-hole.

[ElektroFreak]

Since those pics are so small, i'm having a hard time recognizing what I'm looking at. Any chance you could post bigger ones? I can see the diode in the third picture, but from that angle I can't see if it has FAC..

You have said it is a cmount, and as far as I know the lowest power cmount pump diode I've seen has been 500mW.. You must be losing a lot of power, since 500mW should get you ~50-100mW depending on the setup..

[jeejeedr]

Since those pics are so small, i'm having a hard time recognizing what I'm looking at. Any chance you could post bigger ones? I can see the diode in the third picture, but from that angle I can't see if it has FAC..

You have said it is a cmount, and as far as I know the lowest power cmount pump diode I've seen has been 500mW.. You must be losing a lot of power, since 500mW should get you ~50-100mW depending on the setup..

The warning on the module says max 100mW. So it could be that a lot is wasted on the pinhole. I'll take some other angle pictures more detailing the pump.

By the way, what order is the drive current for about 500mW?