Electronics > Repair
Laser diode identification
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nccer:
Hello, I got problem with damaged laser diode. I want to replace but I am not sure what to buy. I am repairing Olympus OLS4100 microscope, and its laser diode is damaged. I want to know where to buy the same model of diode. I only know its wavelength is 405nm now, but I don't know its power.
HiddenBear:
Hello

The microscope is quite advance I must admite, for sure a laboratory tech.Luckyly Olympus is a well knowed firm, so in the first place I would send a mail to there tech support. If I'm correct there should be a plate on the backside of the microscope with a manufacturing number and a telephone one to there tech support. Zeiss's confocal microscopes have something like that, not sure about Olympus ones.  I'm assuming that You are working for a laboratory so you should have access to a university mail. I would ask send them a messenge that you have some questions about the laser that is used for the laser in the pretext of adding this information to a article You are currently working on.

But I would ask myself if the laser diode is damaged for sure? Got You any communications from the software that the manufacturer provides that the laser diode is damage? It's a vital question because laser diodes are precisely engineered for aplication that they are used in. You could buy a laser diode with the same wavelenght, but as you well pointed not knowing the power of this one. Droping a random one that fits the size and wavelenght is not a solution, because it could damage the sensible electronics of the microscope or just not work.

Also a good question if the microspoce have a valid warranty, if yes I would contact the service. Hoping that's better than the Zeiss one xD. Maybe it's a ~70/140$ worth element, but the microscope cost ~70 000 $ (here in Poland when I asked my doctor a few months ago for a similar model). I personalny wouldn't take a risk of fixing it myself not fully knowing the electronic scheme of the circuit or all the diode parameters.

Thats my view on this topic
Gyro:
Regarding the identification, can you not take an uncompressed image and read the QR code? There are too many compression artifacts on the image that you posted.
Twoflower:
The QR Microcode says: 1103773241

Looks like a serial number.
fzabkar:
I examined a few datasheets and it seems that the efficiency is about 20%. Therefore, you should be able to estimate the power output by measuring the operating voltage and current, and then dividing the power by 5.

I notice that there are some diodes with an additional monitor photodiode, eg ...

https://seltokphotonics.com/upload/iblock/0da/0dafefd3d61917cf79272576d3a83ff5.pdf
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