It is Here.!!!!! 300mW "635nm" Mitsubishi.....

[Bionic-Badger]

Well I just received my 300mW 635nm diode and have run some tests.

417mW @ 600mA
450mW @ 650mA
484mW @ 700mA
512mW @ 750mA
540mW @ 800mA

Edit: Lens info: I was using an O-like 660nm glass lens from their 18mm modules.

I didn't take it any further.

I also did some experiments with trying to correct the axis mismatch. I started off with some cylindrical lenses, but they didn't seem to help much. Then I tried using some anamorphic prism pairs. The 473nm lab lasers you can buy on eBay come with a set, used to correct the output of the IR laser diodes inside.

It works quite well for beam correction:

(correction)

(no correction)

Unfortunately, the kicker is: 50% losses.

If you can live with 50% losses, this prism pair works pretty well to generate a decent beam profile. Compared to the price of higher-powered 635nm lasers with round profiles, such a loss may be acceptable anyway.There are red-AR coated prism pairs too, but unfortunately they're very expensive.

 

[Fiddy]

Nice work!

I know my Optnext single mode 635nm HL63133DG will do 210mW with a 650-G-1 @ 300mA
Still less than half of that with a Aixiz glass lens on the Mitsubishi 300mW diode tho.

 

[Bionic-Badger]

Oh yeah, RHD: you might consider using a better mount than that Aixiz 12mm mount for your Peltier setup. You're lucky it frosted up because those things seem to only touch the module inside at a single tangent at the bottom. They suck and I wouldn't trust them for anything short of gluing something to their sides.

 

[lazeerer]

@Bionic-Badger Have you tried to use only 1 of the prisms instead of 2.?

I have a set of those from one of the 2 473nm labbies i got that did not perform so well but i have yet to take it apart.

I wonder if one will do the trick Just as good from one of those Prism as Cyparagon tested it with a single prism and said it works pretty well to, but iam unsure which Prism he used.?

If one will work then your only looking at a ~25% loss.

 

[Bionic-Badger]

@Bionic-Badger Have you tried to use only 1 of the prisms instead of 2.?

I have a set of those from one of the 2 473nm labbies i got that did not perform so well but i have yet to take it apart.

I wonder if one will do the trick Just as good from one of those Prism as Cyparagon tested it with a single prism and said it works pretty well to, but iam unsure which Prism he used.?

If one will work then your only looking at a ~25% loss.

Technically any prism will work if you can get the correct angle. Those ones are just designed for anamorphic purposes.

Hmm, I'll try that out. 25% loss isn't terrible, and at $35 +shipping for a pair of prisms on those broken lab lasers + having an awesome case, you can't go wrong. I can probably angle it without having to take those things of the mount. It may even narrow the beam further.

 

[lazeerer]

Technically any prism will work if you can get the correct angle. Those ones are just designed for anamorphic purposes.

Hmm, I'll try that out. 25% loss isn't terrible, and at $35 +shipping for a pair of prisms on those broken lab lasers + having an awesome case, you can't go wrong. I can probably angle it without having to take those things of the mount. It may even narrow the beam further.

Awesome Waiting for the Update.:thanks:

25% is Not bad at all. If you Use a G1 lens then Correct it you should counteract the Loss and you will be around the same power as you were when using one of those AR coated Acrylic or glass lenses coated for Red but with a nicer beam.

But iam unsure if the much worse divergence that the G1 lens gives will effect the correction.?

Do you have a G1 lens.? If not I can send you 1 to give it a try.?

 

[Bionic-Badger]

Good news! I tested out using a single prism (without removing it from the plate:

The losses for a single prism are actually lower than 25% (measured with 100mW):

The axis correction is not as good as two prisms, but it still a substantial percentage of it, reducing the width by about half. Hell, if you can tolerate 50% loss I think the correction with 2 prisms could even be better.

No correction:

Single prism:

Prism pair:

 

[lazeerer]

Thank You for the Testing. :wave:

So Using One out of the 473nm labbies works and not much of a Loss with using a single prism. This is Great because the labbies are so cheap and you get other goodies in them.


It would be nice to get one of those AR coated for Red Prisms but as you said they are pretty expensive.

These here are sold by someone that is a member on this forum:
Precision AR Coated Right Angle Glass Prism. Anti-Reflective Coating. US Seller! | eBay

I see in the description it says they are coated for the 555nm Green spectrum. You think since the coating for these are Closer to ~635nm that we might see even less loss when using 2.?

I am going to send him a PM here and see what he says.

 

[Bionic-Badger]

I'm not too sure about the nature of AR coatings. The prisms in the 473nm laser are for IR, which I usually consider closer to red than the ones for blue or green, but I actually don't know how well green AR coatings are supposed to be. There are some cheap AR-coated prisms at Surplus Shed too which might be worth a look. I'd first see if a generic 90 degree prism is worth using however. It may not have the right input/output angles.

 

[lazeerer]

I picked One of them up just to give a shot and see whats its Like.

If it turns out to not be better then the ones in the 473nm labby Then Ill move over to Surplus Shed and see what i can buy and buy a few different kind to try out.

Hopefully we can find one that is more budget friendly with the least amount of loss when using 2. Which is my goal.

When Your Building a Lab and you dont care to much of a little worse divergence then using one will be OK since usually in a lab there is enough room in the housing to off set the module/heatsink and the prism so the beam still comes out of the center of the housing. But in a Handheld its Quit difficult to do unless you dont mind it coming out of center.

Ill update when it comes in.

 

[Bionic-Badger]

You could always use mirrors to project the beam out forward again too.

 

[MadEye]

Hey Guys...

Today I build my first 300mW 635nm Diode into an C6 Host, and I knew they are multimode and are even worse then the 445, but my Diode has something odd: When the beam is focused I get a second dot. I cleaned the Diode a thousand times now, also changes Lenses (Aixiz Red Glass, Acrylic Lens) but this appears every time its focused...
The output without a lens looks pretty normal, so I think its coming from the diode itself...

The second picture is at about 4-5 meters away, most splash is gone at this range, but the second dot is still there... At bigger distances its also still visible and pretty big...

Is this common with the 300mW diode or have I just got a bad sample? I can live with a multimode, but two in one housing is to much .

 

[InfinitusEquitas]

I have some similar artifacts on two of my 635nm lasers. Though more spread out and not quite as focused. Obviously also cleaned the diode windows and lenses:undecided:

The "wings" are completely normal though afaik.

 

[Paddy]

Wow, have you tried it in a fogged up room?
would be pretty cool if you could get two beams.

 

[MadEye]

I knew about the wings, and they do not diturb me, Its the second dot...
I dont know how you can live with such artifacts, but for me its most often a reason to throw the diode away... Never needed more then a second try, but thats for PHRs and LPCs, for this kind of diode its a little bit expensive... Just 2 days ago I had a defective 445nm Diode, and now this ...

 

[kiyoukan]

well here is my update for this diode as we need all the help we can get.
Okay so some more updates.
Its time to ask the forums for help.

So as far as i have found we want a lens with a focal length between 2.5EFL and 3.3 EFL with a NA no less than 0.6 however a 0.72 would be ideal.
with a diameter of no less than 4mm and a CA of over 3.3
So in short from what i have found the best possible lens for our application would be.
EFL-----NA-----CA(mm)-----OD(mm)-----WD(mm)
2.5-----0.72----4.0---------6mm-------- 1 to 2mm
3.3-----0.72----4.0---------6mm-------- 1.54 to 2.5mm
If someone here on the forums can come up with the design so i can submit it to the company that would be great.

However there was a close production lens found.
The closest production lens i have found is NT83-676 from edmunds.
EFL-----NA-----CA(mm)-----OD(mm)-----WD(mm)
2.54-----0.66----3.3---------4mm-------- 1.55mm
That lens is made by the company LightPath and sold to Edmunds
However they are just as expensive.


I have found a manufacture who can make them, they are the same people who made my cylindrical lenses.
I wont know till the first of the month when the manufacturer gets back to me if they can replicate a lens i send them.
If they cant we would need to come up with the design.

I was talking to some people about the 2.9FL lens that i think dave has from LSP but was told it had a na of around 0.45
This i cannot confirm. but if someone has more details on this lens pleas please post them.
http://www.youtube.com/watch?v=jiU1...xt=C369be06UDOEgsToPDskJau2E2wyQjsYZjh6HKX5-m
cant seem to link video it seems to give me a white square.