4w 905nm diode?

[deadshadow]

hello everyone today i came to a weird find on ebay.this is supposed to be a 905nm 4w pulsed diode in 5.6mm package.
another thing that i saw is that on the title says 'A series' and if you read the description it mentions this:

Beam Quality:
- A series mean that the chip will produce a uniform beam. Emits high quality beam for more precise scientific applications.
- B series mean that beam is not uniform and may emit inconsistent pattern.

link:Pulsed Laser Diode 4W 905nm 60u (2.5mil) PLD lot of 1 unit (A series)

any chance this would be a real 3w+ infrared with a not so horrible beam divergence? :drool::lasergun:

 

[Eracoy]

Considering it is pulsed, the question becomes what percentage of the time it can remain on. If it is 4W, but only for 10ms every second, that makes it 40mW total output.

 

[deadshadow]

Considering it is pulsed, the question becomes what percentage of the time it can remain on. If it is 4W, but only for 10ms every second, that makes it 40mW total output.

generally all diode are supposed to be pulsed and cw and alot of times we tend to everdrive them and hit the pulsed rating on cw runs,especially on bluray and the dvdrw reds.am i wrong?

 

[RedCowboy]

With reduced MTTF and less efficiency creating more waste heat to dispose of, but nothing over the spec is guaranteed and an ir may go led suddenly when overdriven rather than dimming down and giving you warning when overdriven to find what it will take even if for a short CW duration.

 

[Cyparagon]

any chance this would be a real 3w+ infrared with a not so horrible beam divergence?

The emitting area listed is 1x60 microns, which is pretty bad. The output will be a bar, rather than a dot.

 

[diachi]

A series mean that the chip will produce a uniform beam. Emits high quality beam for more precise scientific applications.

Without detailed specs this doesn't really tell us anything useful, all it means is that the beam specs for the A series are better than the B series. May be worth contacting the seller to ask for a proper datasheet. Any half decent datasheet will give you beam specs, power/current/voltage charts and more. In the case of pulsed LDs it'll give you those ratings too.

 

[deadshadow]

good idea diachi they also mention on the descreption that there a datasheet so i send them a message to sent me the datasheet