GB 20mW 635nm diode

[Leodahsan]

uuh.. 20mW to 7mW is big difference.. try to make a pointer with 50x 7mW diodes.

 

[RA_pierce]

I'm surprised so many people are interested. Aren't 7mW 635nm diodes only $2 each? And I would think they're capable of slightly above that. I understand getting maybe one just because it's 20mW vs. ~7mW, but people are spending $100 on 5 of these things rather than for $100 you can get 50x 7mW diodes? I'm sure you could hardly even tell the difference side by side between the two.

Not really. I've killed a few "7mW" 635nm diodes just seeing how far they can go.
Also, the wavelength shifts toward 640nm as the power is increased. I got one to output 13mW but the wavelength was somewhere between 640nm and 650nm.

These diodes will lase at ~635nm at 20mW, which is a big improvement over ~10mW of 645nm. The color difference is subtle unless the beams are compared side by side, but a "laser enthusiast" can tell the difference.

 

[Drew]

I'll take 1 for sure

 

[aryntha]

The way I look at it, on the 7mW vs the 20mW; Chances are the 'pushing margins' are maybe percentagewise the same, but actual power, much slimmer.

In other words, a 7mW may be able to be pushed to 10mW and shift to 645-650 at around 9mW;

but the 20mW may be able to be pushed to 35mW and not shift to 645 until 28mW, for example.

So at 635, we may be looking at, actually, 8mW vs 25mW.

As for the people who say they can't see the difference; I don't really understand this, as the difference between say one of my 50mW 660nm NewWish pens and my 30mW JDSU 1145 HeNe -- are night and day. The HeNe looks much more orange, and much more bright.

I wonder if it's that people really can't see the difference, or the difference just isn't blatant enough for most people to care?

 

[Leodahsan]

The way I look at it, on the 7mW vs the 20mW; Chances are the 'pushing margins' are maybe percentagewise the same, but actual power, much slimmer.

In other words, a 7mW may be able to be pushed to 10mW and shift to 645-650 at around 9mW;

but the 20mW may be able to be pushed to 35mW and not shift to 645 until 28mW, for example.

So at 635, we may be looking at, actually, 8mW vs 25mW.

As for the people who say they can't see the difference; I don't really understand this, as the difference between say one of my 50mW 660nm NewWish pens and my 30mW JDSU 1145 HeNe -- are night and day. The HeNe looks much more orange, and much more bright.

I wonder if it's that people really can't see the difference, or the difference just isn't blatant enough for most people to care?

I CARE. :beer: I'm not into this GB because I don't have the money and, if I had to buy a 635, I'd buy a 'little' higher powered one (like around 50mW rated for 80mW peak).
I would'nt care for what *someone* says, if there are people interested, they care.

thats just me tho.

 

[jakeGT]

i've never had a 635, so I will be comparing it to 650. And I can tell the difference between "blue" and "violet", why not "orange" and "red"?

 

[RA_pierce]

i've never had a 635, so I will be comparing it to 650. And I can tell the difference between "blue" and "violet", why not "orange" and "red"?

635nm is definitely more orange than ~650nm but it is still absolutely "red."
The difference between 405nm and 445nm is much greater.

Here is a picture for reference.

From left to right: 9mW ~635nm (the "orangest" 635nm diode I have), 13mW >635nm, 12mW ~650nm, and <5mW ~655nm.

 

[Alexizupinhea]

$2? Not quite...?

http://aixiz.com/store/index.php?cPath=44_25

-Trevor

3 pcs. 635nm red laser diodes DL 6353TL 7mW NEW 3 pcs. - eBay (item 380317697517 end time Feb-24-11 12:07:39 PST)

And there used to be either 50 packs for $100 or 100 packs for $200 from Meredith Instruments iirc, and Dave used to sell them 5 for $10 as well for a short while since he bought one of these lots and didn't need them all.

And i'm not saying you could hardly tell the difference between 635nm and 660nm - I am a "laser enthusiast" who has plenty of henes and some 7mW 635nm builds and I certainly notice the difference, but I'm saying that a 7mW laser and a 20mW laser isn't much of a brightness change. I am also saying that those of you buying multiples of these 20mW rather than a 7mW for a tenth of the price seems a little bit drastic. Of course it's your money, spend it however you wish. I'm just trying to inform those of you who may not have known that 7mW diodes are 1/10th of the price of these, and perhaps could be be 1/15th of a price or less if they were in there own group buy.

 

[DJNY]

^The link you refer to shows $11.99 BIN price for 3 diodes

I think most of us know that 5-7mW 635nm exists. 5mW 635nm pointers are quite cheap (Atlasnova 5mW is $30 shipped f.e.). One reason why they are cheaper is because they are produced in much bigger bulk than these 10mW, 20mW.. 635nm diodes.

If someone is able to combine 4 of these 5-7mW diodes for a 20mW output, great - I can´t. Three cars with 45kW would be still three cars with 45kW, and all of them have less power than a 80kW car. I´m SURE that I´m going to be happy with my 20mW 635nm pointer. The 5mW 635nm I have is great, but I can´t really see the beam w/o smoke/fog/steam. I´m going to make a comparison between 5mW and 20mW 635nm once I have it.



:bumpit: 18 more diodes to go :bumpit:

 

[aryntha]

I just don't agree that the end brightness is about on par... The 7mW diodes, if they dont slide into 640 at 7-8mW, likely will be doing 5mW after optical losses if you don't use a 650-G-1.

On the other hand, these might be doing 18.

Now, I'm speaking from the experience of my Atlasnova doing 3mW, vs my Sanyo 635 doing 39mW. It's night and day to put it lightly.

If I can get 25mW out of one of these, I'll be happy; I'm buying several because I don't want to "wish I had" as I do with the 40mW ones.

 

[mfo]

Are any of you guys going to push these past 70mA??

 

[quantile]

Count me in for two, please.

 

[jakeGT]

i like aryntha's point, i;m not gonna wish I had either, count me in for 2 instead of 1 dj

 

[tysonc1979]

Are any of you guys going to push these past 70mA??

I probably will push one past 70 i will let you guys know how i make out.

 

[DJNY]

:bumpit: 13 more diodes to go :bumpit:

As soon as we reach 50 diodes, there won´t be one left!

 

[qumefox]

if I had to buy a 635, I'd buy a 'little' higher powered one (like around 50mW rated for 80mW peak).

Try pricing 50mW 635nm diodes, you'll quickly see this price for 20mW is a really good deal..

and also, if I can get the $19 price, (or lower ) put me down for 10. Though I can't PP until tuesday, last check won't show up in bank until monday night.