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Old 05-02-2012, 11:54 PM   #76
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Quote:
Originally Posted by foulmist View Post
true!!! alibaba is almost all full of scammers. I have dealt with them before. It can be hard to determine which one is real! BEWARE!
Interestly enough, I've used alibaba for flashlights and "neocubes" or "buckyballs" (5mm or 6mm round neodymium magnets that you can make fun stuff with) and had zero problems so far. I have never tried diodes though.

I have always wondered whether they really would withhold the funds from the seller if you filed a complaint.

It SEEMS like they have a good escrow protection program, but since I haven't had to use it, I don't know.

I will say that almost - but not ALWAYS - all of the time I order something from alibaba I find it competitively priced on eBay.
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Old 05-06-2012, 04:49 AM   #77
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Just an update, if you are willing to buy three, you can get them for $110 each...

3pcs New Mitsubishi 638nm 500mW CW ML501P73-02/Orange Red Laser Diode/Solid Beam | eBay
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Old 05-06-2012, 05:05 AM   #79
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Do you plan on keeping these in stock DTR? Or do you have a limited supply also?
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Old 05-06-2012, 05:20 AM   #81
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Updated the OP.
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Old 05-06-2012, 05:24 AM   #82
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

That's what we want to hear!

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Old 05-06-2012, 06:13 AM   #83
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Quote:
Originally Posted by DTR View Post
Or you could just get one from me for $110 and have it in a couple days in the US.

If you really want three it is $315.
Sorry about that! I didn't realize you had them in your shop. I'd always buy from you first if I have the option! Glad to see the info is now included in the op.

to everyone!

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Old 05-07-2012, 02:37 PM   #84
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

It's good to see there are now very powerful red laser diodes available. Unfortunately they are all multimode. If you want a pointer that's OK. However if you want to burn stuff or create holograms DVD burning diodes remain your only option.
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Old 05-07-2012, 02:48 PM   #85
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Quote:
Originally Posted by flogged View Post
It's good to see there are now very powerful red laser diodes available. Unfortunately they are all multimode. If you want a pointer that's OK. However if you want to burn stuff or create holograms DVD burning diodes remain your only option.
What's so bad about a multimode diode?
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Old 05-07-2012, 02:51 PM   #86
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Bad beam specs and cannot be focused to as fine a point.
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Old 05-07-2012, 05:23 PM   #87
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Quote:
Originally Posted by flogged View Post
It's good to see there are now very powerful red laser diodes available. Unfortunately they are all multimode. If you want a pointer that's OK. However if you want to burn stuff or create holograms DVD burning diodes remain your only option.
The new 3.8mm red diodes lazeerer has recently found are not multi mode and have not been extracted from DVD burners. They are new/unused
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Old 05-08-2012, 09:14 AM   #88
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Well, I got my ML501P73 today. I must admit while it can take some current, it was a little underwhelming. Running at an amp it didn't seem as bright to me as an LPC-815 running at ~350mA. Maybe mine is just a little longer wavelength than normal? The LPC beam was visible in a slightly dark room but the ML501P73 beam was never visible, I had to apply smoke to see it.

I put it into the largest heatsink I had at work snuck it up to 1.4A (I don't have an LPM so don't know what power I'm getting). I'll put it into a host when I get some more driver bits:

Beamshot with smoke- (well, alcohol sprayed in the beam):


The Spot through Aixis Glass:


As far as I took it:


Spot through a 405 coated lens (with wings):
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Old 05-08-2012, 03:39 PM   #89
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Interesting... I wonder if you have a bum diode? I would expect that to be noticeably brighter. It should definitely burn better.

Keep us posted.
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Old 05-09-2012, 02:56 AM   #90
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

I noticed alot of wings on mine too.. I got my 2nd today and have pumped 1900ma into it and it still lives... It is allmost a starburst lol... but it is nice... Could that have to do with it being open can?
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Old 05-09-2012, 03:07 AM   #91
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Dont get me wrong, it's definitely very bright.
I just remember my LPC diodes had the beam faintly visible and this one didn't. I haven't put it side by side with an LPC diode because my last one died last week when the driver failed.

It's slightly wider diameter on the mounting "lug" for the crystal than my LOC diodes to the extent that I had to ream the hole in the heatsink out a little. It took 1.4amps without flinching and the beam profile with wings is the same as the pics i have seen of other ones. It could also just be a longer wavelength than the average I guess.

I did notice that it seems to "step" in brightness. It seems to suddenly jump up to a higher brightness state at about 500mA and 700mA, then goes through a noticeably step down in brightness at 800 or 900mA before getting brighter again, then its somewhat linear increasing brightness from about an amp to 1.4A. I suspect the thing was getting hot and going down in frequency.

I'd like to put a lux meter or LPC on it to see what's going on.
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Old 05-09-2012, 04:57 AM   #92
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Quote:
Originally Posted by foulmist View Post
true!!! alibaba is almost all full of scammers. I have dealt with them before. It can be hard to determine which one is real! BEWARE!
so far i've had good experience with alibaba.
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Old 07-03-2012, 06:11 AM   #93
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Ok, I'm on vacation (at my folks in FL while my in-laws house-sit and dog-sit for me) and I packed up all my laser stuff and brought it here to have something to do on slow days.

Except my 445's.

I DID bring this diode along though...

So I'm thinking of throwing together a high powered red build.

Questions about these diodes...

What is the general consensus on safe current?

Looking at this thread, would 1050mA be ok do you think?

Rayfoss/Mitsubishi 638nm 300mW laser diode


And, where can I get lazeerers optics correction for these?

Thanks!
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Old 07-03-2012, 10:54 AM   #94
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

I think 1050mA is pretty safe. I have seen builds with 1.3A-1.5A with a power output of 1+ Watt sweet redness. But your link points to a 300mW diode and this thread is about 500mW. I don't know which diode you are getting.

Maybe you should ask Lazeerer about the lazeerers correction optics.
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Old 07-03-2012, 04:03 PM   #95
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

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Originally Posted by Blord View Post
I think 1050mA is pretty safe. I have seen builds with 1.3A-1.5A with a power output of 1+ Watt sweet redness. But your link points to a 300mW diode and this thread is about 500mW. I don't know which diode you are getting.
Good point, I have the 500mW version. I was looking at DTR's page and it had a link to that thread. Apparently I was on his 300mW page and not the 500mW page.

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So... Knowing that I have the 500mW flavor, does 1050mA still apply? I guess that I could add another 7135 and go to 1,400mA.

Does that just turn up power while also turning up the wavelength and end up with a less reliable diode and not much real increase in perceived brightness?

Quote:
Maybe you should ask Lazeerer about the lazeerers correction optics.
Well, that is kind of what I was doing here. But rather than just ask him and depend on whether he was online at the moment, I thought someone else might know where an order link was if he wasn't online ATM. :P
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Old 07-03-2012, 04:46 PM   #96
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

Yeah 1.4A is safe for the 500mW, and 1050mA is alot safer, but 1.4A should be no problem.

Also I have one of lazeerers correction optics and it helps tremendously with the rectangular dot. Definitely PM him about it that's the only place they are being sold as of now is privately from him

Although I did get a newsletter from cajunlasers saying they now carry the lazeerer x-drive which is phenomenal news!
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Old 07-03-2012, 10:09 PM   #97
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

So what do you guys think? 1050mA and keep it alive longer, and at a lower wavelength or amp it up to 1400mA and get more power but higher wavelength?

It is a $130 diode...



EDIT: I have one of these...

16.8mm 1300mA 5-Mode Memory LED Driver Circuit Board for Flashlight (DC 2.8-4.2V)

1.3A? Modes... I can scope it real quick!
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Old 07-03-2012, 10:13 PM   #98
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

It is a decision you have to make. High power with higher not-so-desirable wavelength or lower power for better wavelength.

For color --> 1050mA
For power --> 1400mA

You can't have them both
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Old 07-03-2012, 10:27 PM   #99
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

You are probably better off with it @ 1050mA than going to 1.4A. I am not sure I would say that is a safe current yet either. I currently recommend 750mA on the 300mW and 1A on the 500mW but it is up to you how far you want to push it. You might even loose visual brightness and some stability that high plus I assume this is not a going to be the burner of your collection so I really don't see a need to crank it up. But that is just my two cents.
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Old 07-03-2012, 10:49 PM   #100
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Default Re: There HERE. Eat your heart out 500mW Mitsubishi's ML501P73

I'm not having any luck with that driver above. I assume it is pretty basic...

Center is battery + outer ring is battery -

Running the + and - on the populated side to the Jufran test load with 4 diodes jimpered.

There is a solder blob on the populated side of the board where they soldered the leads, it could be bridging something it shouldn't.


Quote:
Originally Posted by DTR View Post
You are probably better off with it @ 1050mA than going to 1.4A. I am not sure I would say that is a safe current yet either. I currently recommend 750mA on the 300mW and 1A on the 500mW but it is up to you how far you want to push it. You might even loose visual brightness and some stability that high plus I assume this is not a going to be the burner of your collection so I really don't see a need to crank it up. But that is just my two cents.
Exactly what I was looking for DTR, thanks!

That was my concern, that turning it up wouldn't result in that much increase in perceived brightness since the wavelength was climbing.
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