505nm and 480nm diode RESULTS

BowtieGuy · Aug 6, 2017

RA_pierce said:
Hi!
I'm glad to hear it. Was it the ~1.5W 445 that I built for you?
Did you get a chance to put it on a power meter? Back then, all I had was a 1W Laserbee meter.

And it's good to hear Flaminpyro is still active. I'm trying to plan another chrome pen (with one of the "505" diodes - though 470 would be ideal) and I think I'll need another one of those slick stainless steel focus adapters.

No, this one wasn't made for me, if I remember, it was the last of a couple that you were selling. You said that you thought it was 1+ Watt but couldn't be sure; I did get a chance to check it, and it did 1,287mW with the batteries as I received, and with a full charge it output 1,389mW! :yh:

Yeah, Jeff's still around occasionally, not too often though. I had tried to PM him with no luck, and ended up sending him an email which he answered right away.
I ordered some of his great solder flux while he is still selling it, and tried to pick up some 16.8/17mm battery boards also, but he's out of those for now.

Singlemode Laser · Aug 6, 2017

paul1598419 said:
Yes, and the diffraction grating has been etched into the diode's front facing emitter in some diodes to tune the line width to a very narrow spectral response. Of course you lose the ability to tune these externally if my understanding is correct.

The grating is etched directly into the diode itself (in the diodes gain medium to be more precise) or the grating is located at the rear facet. The first diode laser is called DFB (distributed feedback laser) and the second one DBR (distributed Bragg reflector laser). Etching gratings on the facet comes with the problem of a very high reflectivity of the grating that is based on the same semi-conductor material as the diode. So almost no output will be available.

Attaching a grating from another material that transmits most of the light is possible and is done a lot nowadays.

In all cases the tuning is only possible by changing the temperature like you already pointed out.

Singlemode

paul1598419 · Aug 6, 2017

Yes, now that you said that I remember it like it was yesterday. It has been awhile since I spent time researching these.

jnrpop · Aug 10, 2017

ZRaffleticket said:
Good news everyone - the odicforce page lists a driver (the one I bought) that looks identical to the ebay listing. They say 3-5V input

Variable Boost Driver Board for 515nm and 520nm Green Laser Diodes - OdicForce

paul1598419 said:
That looks identical to the one I have coming from China for $7.98. If it is the same one, it is far cheaper from the Chinese. I know BowtieGuy found a linear driver that is made for a case positive diode. I looked at it and it looks perfect for use with the case positive 505nm diodes.

Ordered a few drivers from this seller to test out, including a couple of the 515-520nm drivers. Im in the EU so postage should be reasonably quick :beer:

paul1598419 · Aug 10, 2017

Let us know what you find out. I am trying to keep this information posted for all to see.

joeybab3 · Aug 15, 2017

If I can just find a driver for the 505nm then I'll be good to go. Let us know how they work out for you.

paul1598419 · Aug 15, 2017

Which of the three 505nm diodes do you have, Joey? If it is the SB1473N91 you can drive it with a Nano Boost driver if you want to drive it at 275 mA. If you have the SB1573N91, it is case positive and you'll need the linear driver BowtieGuy is using, but he has the link for it. If it is the SB147EC91, it is a 510nm diode. I have one of the boost drivers coming from China that is supposed to be able to drive a 520nm diode up to 120 mW, but I won't know anything about it until it gets here.

joeybab3 · Aug 15, 2017

paul1598419 said:
Which of the three 505nm diodes do you have, Joey? If it is the SB1473N91 you can drive it with a Nano Boost driver if you want to drive it at 275 mA. If you have the SB1573N91, it is case positive and you'll need the linear driver BowtieGuy is using, but he has the link for it. If it is the SB147EC91, it is a 510nm diode. I have one of the boost drivers coming from China that is supposed to be able to drive a 520nm diode up to 120 mW, but I won't know anything about it until it gets here.

I have the GH05035A2G, or at least that's the model the seller said.

paul1598419 · Aug 15, 2017

I'm sorry, Joey. I meant the micro-printing around the diode's window. You should find one of these three numbers. You will have to use some sort of magnification to read it, but that will tell you which of these three diodes you have. And they are all different.

That linear driver that BowtieGuy linked me to is called the "Blitz Linear Driver" and is on Survival Laser's website.

10fenny · Aug 16, 2017

I didn't need any magnification to see it!! Hehe! I also got to see this case pos diode running in person at SELEM! Not as blue as ide imagined but still a cool color

jnrpop · Aug 16, 2017

Recieved the Odicforce 515-520nm Drivers i ordered,
First glance at the spec sheet they seem promising for these 505nm diodes,
I'll get some testing done this weekend and ill be posting it in the other thread about this specific driver
Can be viewed here:

http://laserpointerforums.com/f67/odicforce-boost-driver-100980.html

cheers :beer:

paul1598419 · Aug 16, 2017

You are talking about the 503nm diodes, right? Those are the only ones that are case positive. The "480nm" diodes are case neutral.

Edit: Those boost drivers won't work with the case positive 503nm diodes unless you isolate the case from the rest of the host.

Yeah! I got the boost driver from China I had been waiting for today. Hopefully, I'll have some time later today to test it.

paul1598419 · Aug 23, 2017

I finished the testing of the four 505nm diodes I received from Techhood today and the results are as close as I could get to room temperature with these diodes without a heat sink. I have a heat sink coming that will allow me to test bare diodes and keep them at room temperature without pressing them into anything. I still have a couple of weeks left before it arrives.

In order of wavelength: 502.0 nm, 502.2 nm, 502.8 nm, and 503.2 nm. As they were allowed to warm up they did increase dramatically in WL. That is about 1.5 nm to 2 nm higher for each diode. I didn't allow them to get past very warm to the touch as I didn't want to take the chance of losing any.

RA_pierce · Aug 23, 2017

paul1598419 said:
I finished the testing of the four 505nm diodes I received from Techhood today and the results are as close as I could get to room temperature with these diodes without a heat sink. I have a heat sink coming that will allow me to test bare diodes and keep them at room temperature without pressing them into anything. I still have a couple of weeks left before it arrives.

In order of wavelength: 502.0 nm, 502.2 nm, 502.8 nm, and 503.2 nm. As they were allowed to warm up they did increase dramatically in WL. That is about 1.5 nm to 2 nm higher for each diode. I didn't allow them to get past very warm to the touch as I didn't want to take the chance of losing any.

I may have some 532 pointer modules that I took apart.
Some of these are constructed so that the diode is placed in the module then secured with a threaded ring. If you'd like, I can send them to you. I have one for 5.6mm and one for 9mm diodes. The only difficulty with them is that they wont accept any of the lenses we're used to using - not without some creativity, anyway. PM me if you're interested.

paul1598419 · Aug 23, 2017

I'm not entirely sure what you are offering me. Is it just the modules, or diodes in the modules? I could use some 808nm diodes, but really have no use for modules that are different than the ones we normally use....unless they are for particularly high power diodes. :thanks:

RA_pierce · Aug 23, 2017

paul1598419 said:
I'm not entirely sure what you are offering me. Is it just the modules, or diodes in the modules? I could use some 808nm diodes, but really have no use for modules that are different than the ones we normally use....unless they are for particularly high power diodes. :thanks:

It's a module that allows you to mount a diode without press-fitting it. It is really convenient if you need easy removal.
The diode is secured with a threaded ring.
Like I said, you won't be able to easily use our normal lenses but it may be sufficient for getting a reading on a spectrometer if you are typically using bare diodes.
The module diameter is 12mm so it will fit into heatsinks designed to accept the 12mm Aixiz style modules.

Here is a picture of the part of the module with the diode socket:

505nm and 480nm diode RESULTS

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10fenny

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