Schematic for a JDSU Mod 10075248 Controller ? / Possible repair ?

[Jem]

I've already PM'd Shrad to express my sincere thanks, but I thought i'd better 'go public' and post here as I didn't want anyone to think I was ungrateful.

To be quite honest I thought this laser had lased its last, so I gave Shrad the go-ahead to do whatever he liked with it as regards attempting to repair it. As I saw it there was no further damage that could be done.

Quite frankly, i'm amazed. Shrad's patience, technical ability and outright knowledge and skill have brought this back to life and I cannot express my gratitude enough

Cheers

Jem

[shrad]

Shrad's patience, technical ability and outright knowledge and skill

only the first statement is correct, plus I just love troubleshooting things, no more then that

also, it seems to me that laser is outputting at least 50mW, so it might be good to check for a way to tune it up a bit

in my investigations I had a look at the RJ45 connector... it has a wire loop and two other unconnected copper tracks, which makes me think about a serial link (RS485/232 as it is common on a pic16f876 based MCU solution)

These two lines look like they might be RX and TX, and this laser must have a software for tuning purposes... if one was to use this, I'm pretty sure he would be able to reduce emitted power and improve mode stability, but this is an asumption

[hologeek]

Here is a copy of the manual. It has the pinouts for the RJ-45 connector. Interesting is that pin 8 is for monitoring laser output noise, which can be an indicator of SLM behavior or instability.

[shrad]

Thanks, I searched for it but didn't find any place to download it

I was hoping there was some RS232 control but apparently it's not the case...

I hope Jem will be able to make some nice holograms!

[Jem]

I hope Jem will be able to make some nice holograms!

I have a Coherent 532-200 for making holograms in my workshop. However, I had plans to try making a very small holographic 'Camera' with this laser, something that would take 2½" square plates max. I was inspired by John Klayer over on the Holography Forum, he's made a nice portable setup using a Coherent C315m. John takes his holographic 'camera' with him when he goes caving to make transmission holograms of Stalagtites, Stalagmites and other interesting limestone formations.

Cheers

Jem

[shrad]

wow, that looks awesome! transmission holograms of such formations must be really marvelous!

if you happen to be able to take a picture of one of those holograms, I'd really be curious to have a look

I think I'll make a PSU for my little hene soon, and try out some simple holographic experiments... I also have plans to fiddle about a scanning michelson interferometer I have in my head for at least a year, so that will be a good start to have a functional HeNe tube

I'll start upon the principle of sam's switching HeNe psu as I have various laser printer PSU boards (and thus transformers, diodes and capacitors of good ratings)

does anybody have an idea of where I could find for cheap one of those zeiss/HP/other brand cubic interferometers with adaptable retroreflectors and such?