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

[lazeerer]

Great work with the testing Lazeerer! Seeing as these require 2.2 volts, what kind of input voltage would you need with a flexdrive?

Iam Just using a 18500 in my build.

 

[AAlasers]

Iam Just using a 18500 in my build.

Really? I guess the flexdrive is more versatile then I thought. Think an 18650 would work fine?

 

[lazeerer]

^ Yes a Flex drive can be run with an Voltage up to 5.5v DC.

http://hacylon.case.edu/ebay/laser_diode/MicroFlexDrive_V5_manual.pdf

 

[rocket689]

Actually those numbers are kinda close to mine.:
http://laserpointerforums.com/f50/here-300mw-635nm-mitsubishi-66942-3.html#post963926

Still Quit a bit off though.

so you guys still should be getting a little higher Power Let it cool all the way and Re test.

Ok, I'll let it cool for a long while, then try again. Thanks!

 

[DTR]

lazeerer what lens again were you using for these numbers? That also would be good to include with the numbers. I thought you said it was was an acrylic but skimming threw I could not find it.

At 350mA I was getting ~>210mW
So I Turned the Current Up to 400mA and I was Getting 255mW
Then Maxed it at 420mA and you see in the video what its reading 285mW.

I did not think these produced much heat. I would have thought they would be fairly stable. I was guessing there would have been the wavelength would shift more than seeing a power drop.:thinking:

 

[midias]

Holy divergence :undecided:

Mine makes a nice square and makes 445 like perfect as well. I powered about 400ma and got about 200mw through an unknown glass lens. I was also using a 9V so I will try again later with a better battery

 

[rocket689]

Maybe you got a freak, Angelos.
It happens with 445 multimodes. DTR can attest to that.
Maybe its the same for these 635 multimodes. :thinking:

 

[kiyoukan]

whats the difference?
www.rayfoss.com
vs
http://www.mitsubishielectric.com/s.../laserdevice/ldindis/638nm/ml501p73_p1245.pdf

Besides the power difference.
I am going to some lengths to see if i cant buy these in bulk.
so could someone tell me the difference.
i think the raw power even with a pin hole optic to fix the beam causing some good power loss 500mw is great.

 

[Cyparagon]

I just got mine in the mail. I'm busy with other things and I'm not going to kill it or do any extensive testing right now. I should have time on Wednesday. I did hook it up though.

The voltage drop is only 2.2V! Barely more than an IR laser diode. That makes them pretty damn efficient.

At room temp and threshold, it was right at 638nm.

I did a more realistic test, too. With the aixiz case at ~95F and current at 380mA, it was 640nm, so it doesn't shift anywhere near as much as other reds.

 

[chipdouglas]

Sooooo this can maybe be driven with a linear driver and a fully charged lithium??

 

[kiyoukan]

So was reading on these lasers and read something interesting
What if you were to chop the fast axis in half with a mirror then direct it threw a wave plate then combine the beams back into 1 with a PBS cube.
This would reduce the size of the fast and keep the power.
I know this would be pricey but what would the beam look like?

 

[lazeerer]

lazeerer what lens again were you using for these numbers? That also would be good to include with the numbers. I thought you said it was was an acrylic but skimming threw I could not find it.



I did not think these produced much heat. I would have thought they would be fairly stable. I was guessing there would have been the wavelength would shift more than seeing a power drop.:thinking:

Use a AR Coated Acrylic lens specifically for red diodes. These Lenses are second Best to the 405/650 G1 lenses power wize...
660nm/405nm PMMA Collimating Lens/M9 P0.5 Frame 2pcs | eBay

All my Test where done with the Laser completely Cooled down.

Ill Do a Long LPM Test Run so you can see how the Power drops.


Edit:

They dont Produce barely any heat. However out of all diodes i have used 635nm have been the most sensitive to Heat. Cool a 635nm diode down and it will put out alot more Power then when its at room temperature.

Maybe you got a freak, Angelos.
It happens with 445 multimodes. DTR can attest to that.
Maybe its the same for these 635 multimodes. :thinking:

Possible but i dont think so.
Its at 475mA and doing a little over 400mW with that lens.

I just got mine in the mail. I'm busy with other things and I'm not going to kill it or do any extensive testing right now. I should have time on Wednesday. I did hook it up though.

The voltage drop is only 2.2V! Barely more than an IR laser diode. That makes them pretty damn efficient.

At room temp and threshold, it was right at 638nm.

I did a more realistic test, too. With the aixiz case at ~95F and current at 380mA, it was 640nm, so it doesn't shift anywhere near as much as other reds.

Awesome. Hopefully mine is still around there.

Mine Drops ~20mW over a few Minutes.

 

[lazeerer]

Here is a Long LPM test I did so you can see how stable it is:

 

[paulzimm]

Here is a Long LPM test I did so you can see how stable it is:

How much current were you putting through the diode to get 400mW of light output?

 

[lazeerer]

Its was at 475mA. Thats where i have it set to now.

 

[kiyoukan]

So any one you who own one of these care to try to correct the beam?
All you need is 3 fs mirrors a pbs cube and a wave plate.
If this setup works you could also do the same for the 445nms to cut the beam down to better size, without losing much power.
We might have found the way someone was getting such a good beam out of a single 445nm laser diode.