ML520G72 638nm 500mw Diode Group Buy

**MisterWilling** · 07-08-2010, 07:40

Originally Posted by andyf97

Ahh, whats going on here, left it for 15 minutes and ran it again, healthy LD again.

It does look like the LD has some thermal protection, could be wrong of course but this is what am seeing. When have finished the optical tests I will re-do this thermal destruction again and see if it keeps recovering.

This sounds very familiar to something I read about a new LOC red diode over on LPF. I know these are very different diodes but they are both newly released red diodes so they share that in common. Heres a link to the post describing the same thing you are seeing, and if you go to the first post it shows his test results

http://laserpointerforums.com/f50/ne...tml#post727209

**danielbriggs** · 07-08-2010, 08:21

Could it be due to temperature expansion / movement of one of the mirrors on the die thus taking the cavity out of alignment and stopping it lasing, so it just looks like an LED?

Just guessing though...

**edison** · 07-08-2010, 11:37

Andy, i send you a pm to explain that you have to focuss the lens in the collimator by twisting the lens into the barrel I forgot to explain how to focus the diode. Maybe you read it so then this message is obsolute

**andyf97** · 07-08-2010, 13:53

Good news the ML520G72 Red diode is indeed very usable for laser projectors.

The specs I have so far are 4x2mm after the lens, and an oval 7mm x 3-4mm beam at 7 meters. Still adjusting but making progress. Cant see the dimensions after the prisms but add that when I manage.

Using a pair of anamorphic prisms and a bog standard no thrills lens

Looks very suitable and better than any of the new 445nm diode beam specs.

**swamidog** · 07-08-2010, 14:16

we probably need some pictures here.

Originally Posted by andyf97

Good news the ML520G72 Red diode is indeed very usable for laser projectors.

The specs I have so far are 4x2mm after the lens, and an oval 7mm x 3-4mm beam at 7 meters. Still adjusting but making progress. Cant see the dimensions after the prisms but add that when I manage.

Using a pair of anamorphic prisms and a bog standard no thrills lens

Looks very suitable and better than any of the new 445nm diode beam specs.

**andyf97** · 07-08-2010, 14:38

Originally Posted by swamidog

we probably need some pictures here.

Just want a few days to test various methods and post results as i find them, only just really started today and I am taking photos as I make progress.

**Doc** · 07-08-2010, 14:48

Good news

**DanBarlow** · 07-08-2010, 17:36

I'm also interested in two.
-Dan Barlow

**jaycey** · 07-08-2010, 20:23

Im interested in 1

**DjHeadie** · 07-09-2010, 08:16

continuing to express interest as these results come in, sounds good!

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