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There are long threads on each of these diodes. However, as the price of of both drops with the G71 @ $40 and the P73 now at $90, is there a consensus on the relative power output and just as importantly the divergence through identical optics?
I am finishing a quad with the G71s and because I will be running it rather hard I'm thinking about phasing in the P73 diodes as replacements are needed, but this could take some time(hopefully).
Optically....the P73 is equal to the G71. NO trade-off there.
Slope efficiency wise.....P73- .89mW/1mA..........G71- .72mW/1mA
in my experience the P73 will output 715mW at 800mA ( Max rated current ) with no TE.
We need MANY data points to establish any meaningful profile. Good Luck....But...CAN YOU EAT IT ??????
BEAM
Do you have a source for this? It's my understanding that theP73's emitter is 50% wider; 100um vs mid 60's for the G71. I can't find the reference (hence the post) that someone had mentioned that the P73's divergence was "somewhat" worse. This makes sense. Also, if you look at the spec sheet the raw divergence of the P73 is higher.Quote:
Optically....the P73 is equal to the G71. NO trade-off there.
Quote:
Slope efficiency wise.....P73- .89mW/1mA..........G71- .72mW/1mA
The improved slope efficiency is also good and if the P73 is simply a wider clone of the G71 this could derive from the lower heat rise at the junction (wider and so lower current density). As I showed before these things are very heat sensitive.
The emitter is wider on a P73.
LPF has some good raw measurements if you wanna go searching.
The source....well..... "Le eyeballs du le CDBEAM"....See pic for new product being considered by TLabs !!! haha
The corrected P73 can acheive less than 1mRad... with a nearfield of approx 4mm....I measure the same for the G71.....so...as far as I have compared the two...side by side...when corrected with a 2.0mm fL collimination lens and 6X cylinderical lenses....they are equal !!
Yes....I know the emitter geometry of the P73 has been measured to be greater than that of the G71 !!! But if they BOTH can be corrected....then....to me....the P73 is the clear choice !!
Le BEAM
remember this thread chaps
http://www.photonlexicon.com/forums/...Quantification
That's good enough for me. If you see the same divergence then maybe the higher raw divergence seen with the diode is removed by a slightly different lens spacing. Whatever... Then I have every reason to drive these hard because as they die there are better ones waiting. This is another good reason for these individually driven diodes rather than series or parallel installations where this upgrade by attrition would be less convenient.Quote:
The corrected P73 can acheive less than 1mRad... with a nearfield of approx 4mm....I measure the same for the G71
Yes I do and I had checked it out, but the statement by CDBEAM is the additional piece missing. Now that I believe that the P73 is going to be worth it, I am going to go ahead and order a couple and do one of my cryo tests to see how it compares on this front as well.Quote:
remember this thread chaps
See pic....Another BEAMTOON....no extra charge !!! Fire those G71's up !!!
Errr...yes...it seems as though the optics used can correct both the G71 and the P73.....and I really do not care if the geometry of the lattice is in the shape/size of a dog turd....the optics correct it !!
Any others have imput on this topic !!! Verification iz a goo D ting !!!
BEAM OUT
ahh.. forbidden planet. one of my favorite movies. ;)
Quote:
Originally Posted by CDBEAM
Ah YES...Mr SD !!! Forbidden Planet was and remains the BEST CLASSIC SF EVER MADE....It has ALL the classic elements.....and was decades ahead of it's time !!!! And yet....so many know NOTHING of it....You just get that " Deer in da headlights " look when you reference the movie !!! Yikes..." Rome rots from within "
Ah well BEAM OUT
That was fiction? Reeely? I've always identified with the professor.
Who is da " Professor " ????....I have always identified with Commander J.J Adams !!!! Yikes...He hada eye for da Ladies !!!!! BEAM
Her Dad, right? DEEP, DEEP down he had serious problems with his future son in law, and he had the machines to do something about it.
Who's your Daddy....was Dr.Moribus. See Pic...Well he was lika Professor....but was Identified as Dr.Morbius....or just Morbius in the film. The film is somewhat based on Shaksphere's " The Tempest " IIRC !!!
Morbius was a Class A Nut Job...who deemed himself superior to all Earthlings and therefore was the self-appointed keeper of the knowledge of the alien race..."The Krell"
The movie seemed to paint Morbius as unaware that his daughter had become a woman....because he was so absorbed in his work....yikes...what else did he have ta do !!!
Morbius did get bent outa shape when his daughter..." Altara " chose Commander JJ Adams over dear ole dad !!!
The Commander was a Class A Cock-Hound himself !!! with the polish of a schoolboy !!! Ah...the Classics.....Life was sooo much more simple then !!!
I gotta get a life !!! I know WAY to much about this movie !!! See the pic of Morbius...The one with the " Eddie Munster hair do "
I know..." What the hell is this doing in the " Advanced Technical " section ???? Lighten up !!! " Forbidden Planet " is advanced AND Technical !!! haha
BEAM OUT
Ah, Robby's debut performance. What an engineering marvel he was. :)
Like I said, I identified with Dr. Moribus. You should cut him some slack. Incidentally, have you seen any of these brainwave computer interface ports being used (because of their expense) with spinal cord injured patients. We have been thinking of looking into these for gaming, seriously. How much you bet the Krell started out this way? Hmm?