520nm diodes - new kid on the block - More powah

[FlutterPie]

I would recommend to be easy on expensive diodes - I would rather fry cheap 780nm diodes than a shiny new 520nm diode, to be frank.

Of course, but we need to know what we can drive these things at.

 

[RA_pierce]

I read somewhere that the laser die degrades pretty fast @ higher powers (cannot recall where), maybe lasting a couple hours if fully overdriven (around 136% as I read...). So, with a $120 diode, I'd not run it over datasheets specifications.

I think the obvious is to run it cool/not abuse it, so efficiency and wavelengths drift to more desirable values.

You have all rights to brag with a 250mW 520nm though... tempting....

Yeah I don't know where this % overdrive figure comes from or whether or not it has any evidence to support it. I usually go by the manufacturer's specs because I trust them more than some arbitrary numbers projected from a completely different diode...

Anyway the datasheet says 150mW is typical @ 400mA and that seems reasonable to me. 200mW isn't much brighter than 150mW and the extra current to get there will just make more heat and a longer wavelength.

Diodes that's driven hard can only die cold or hot, depending on its mood.

What do you mean by that?
Diodes can die for any number of reasons even at normal operating temp.


So has anyone else claimed one yet?

 

[sinner]

Thanks for sharing, It definitely worth the price. +1

 

[DrMario]

Agreeable. It would suck if you weren't intending to pop that expensive diode like a popcorn kernel, so I actually appreciate Murder Funds, as sometimes the datasheet doesn't tell the complete story, as far as maximum withstandable current goes, which Luminus Devices SST-50 LED is a perfect example of. (I have SST-50, and it's retardedly bright for a LED.)

Now, I will wait for somebody to sacrifice the laser diode in the name of science so I would have a better picture of current limit on those diode before I buy one (probably for attempt of pumping Rhodamine G6 dye for fun), and/or build an intelligent microcontroller-managed diode driver.

 

[DrMario]

What do you mean by that?
Diodes can die for any number of reasons even at normal operating temp.

I know, just saying.

 

[Leodahsan]

Yeah I don't know where this % overdrive figure comes from or whether or not it has any evidence to support it. I usually go by the manufacturer's specs because I trust them more than some arbitrary numbers projected from a completely different diode...

Yeah we can't know the maximum power until someone try to murder one of these. The % overdrive figure is based on the PL520...
Anyways, as you said, its an arbitrary value.

But we all know that almost every diode can be pushed very higher than manufacturer specs.

If I had the money, I would had bought one too. Lets hope they are worth their price...

Edit:
@DrMario
You're playing with dyes? Try "Sevron Brilliant Red 2B", its peak absorption wavelength for excitation is 520nm, emitting @ 595nm.

 

[DrMario]

@Leodahson - I think that's the similar dye in orange glowstick that I lit up with 520nm laser, and I decided I would attempt this but first I need to grab a juicy diode as pumping that dye gets a bit efficient once you push the pumping power up a bit. It's just going to be an experiment (and pump light would be pulsed also).

 

[cantthinkofone]

The B1 variant is going in my stubby from sinner

 

[Leodahsan]

The B1 variant is going in my stubby from sinner

Great! The 90mW one? The names are somehow confuse... You're going to overdrive it?

 

[cantthinkofone]

Whichever one is the 120mw. I'm a big osram fan (before lasers i fan boyed over their LEDs) and I'm just waiting till they give us 1w 520 or yellow diodes :beer:

 

[DrMario]

Oooh, 1 Watts 520nm diode! Too bad I will have to wait for that diode's price to drop down enough once it gets out before my wallet will oblige without biting me.

 

[Leodahsan]

lol @ 1W green. Really, even a 5mW yellow diode would be utterly amazing.

 

[DrMario]

It's possible for yellow diode to be developed - who know which active semiconductor material will be used - Gallium Nitride or Gallium Phosphide.

(Gallium Phosphide was also used in older yellow and green LEDs - probably still used for yellow LEDs.)

Nevertheless it would be interesting in how the outcome would turn out since yellow is and was considered a no-landing zone of the diode lasers.

 

[cantthinkofone]

I feel it. My wallet has been feeling it recently. Between new tarantulas and lasers I'm broke and happy.

 

[DTR]

I am working on getting some of these and should have them in stock before too long. Do keep in mind these are not just a more powerful version of the PL520 they are a different type of diode. The PL520 is single mode diode and the PLP520 is multimode diode. But from what I hear it is not as bad of divergence as other multimode diodes that we are used to currently.:beer:

 

[sinner]

I am working on getting some of these and should have them in stock before too long. Do keep in mind these are not just a more powerful version of the PL520 they are a different type of diode. The PL520 is single mode diode and the PLP520 is multimode diode. But from what I hear it is not as bad of divergence as other multimode diodes that we are used to currently.:beer:

Thank you so much for doing this, I prefer buying the ones pressed in module with leads.