Diode Quantification

[danielbriggs]

1st post updated with HL63133DG information; thanks Francesco
10µm width emitter; thickness indeterminable by this optical method (<1µm). There is a chance I could put it in the SEM; although that would mean sputter coating it and obviously no more red photons

[andyf97]

Why dont you add also the rated powers, max current and x/y divergence.

[The_Doctor]

Very good thread! Possibly the most useful I've seen. Only thing I don't understand is why it tailed off over a year ago.

[Galvonaut]

For those of us (me) who haven't learnt the technicalities of diode production, may I ask why this data is useful?

Do the wafer dimensions correlate to output beam specs? Do the number of bond wires just determine the amount to current these devices can handle?

Thanks
Keith

[The_Doctor]

A lot of it is beyond me, but the big thing is just seeing the detail of things datasheets rarely even mention. I saw posts citing 30µm for G71 and 50µm for P73 Mitsubishi diodes, so it's a bit of a surprise seeing proof that the sizes are double that. Originally I'd expected about 100µm for a 500mW diode, so should not have been surprised, but I'd hoped the new figures had been right. As it is, planters and other's posts indicate that using the G71 may have several advantages over the P73. The main correlation is that the wider the emitter, the less likely we are to get easily tamed light and high beam power density, regardless of what optics and money we throw into it.

I used to swear by single-mode only, for that reason, but given the costs of stacking loads of diodes, mount, mirrors, etc, it pays to at least try some modestly priced multimodes with fairly narrow emitters. Real evidence like this beats al the other data I have seen. On the other hand, just seeing the stats people get with their best efforts counts for a lot anyway.

[Galvonaut]

Thanks Doc. I wonder if the size of the emitter and the amount of emitter actually emitting are the same? It is strange that they are quoting double the size - although it's only people like Briggs that are actually measuring these things, so I guess the manufacturers can usually get away with it

[The_Doctor]

I used to think the actual emission would be smaller width, but apparently not. See earlier posts before mine... That bit interests me more than strangely. Maybe there is a claim for effective width at some strength, as if Gaussian, presumably you don't get full strength at the edges no matter what you do get there. I'm glad Dan IS measuring. Really helpful to see new data of a type the makers rarely show. Even if we don't grasp the import at once, can't beat good detailed images. They tend to stick in memory for years, long after words fade.

[danielbriggs]

"Traditional" and single mode diodes ARE much smaller, the G71's and P73's are chunky-chappies.

I should get back to work on this.
The new SM+MM 520nm diodes, as well as the old, new borrowed and blue 445nm's should be worth doing as well.

[laserlackey]

"Traditional" and single mode diodes ARE much smaller, the G71's and P73's are chunky-chappies.

I should get back to work on this.
The new SM+MM 520nm diodes, as well as the old, new borrowed and blue 445nm's should be worth doing as well.

Have you already tested an M140?

[danielbriggs]

Have you already tested an M140?

No blue or green of any sort; only the reds above.