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Old 06-13-2010, 12:38 PM #225
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Default Re: 445nm Casio Laser Diode Compilation Thread

I just love this forum ! Thanks for sharing this valuable information,...


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Old 06-13-2010, 01:28 PM #226
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Default Re: 445nm Casio Laser Diode Compilation Thread

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Originally Posted by Xplorer877 View Post
Just think, we'll never have to deal with fricken DPSS again!

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Old 06-13-2010, 04:01 PM #227
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Default Re: 445nm Casio Laser Diode Compilation Thread

Has anybody harvested and compared the diodes from the XJ-A140 yet? Looks like these diodes are getting even more powerful with each new model released.


These facts are from Best Buy's site;


Casio Model: XJ-A130 Up to 2000 ANSI lumens Up to 20,000 hours lamp life $799.99

Casio Model: XJ-A140 Up to 2500 ANSI lumens Up to 20,000 hours lamp life $849.99
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Old 06-13-2010, 04:13 PM #228
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Default Re: 445nm Casio Laser Diode Compilation Thread

I have one diode from each, so will be able to compare them, but I think they are the same, just one is run harder than the other

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Old 06-17-2010, 06:09 AM #229
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Default Re: 445nm Casio Laser Diode Compilation Thread

My guess is these companies run the diodes way under max to avoid having to pay for replacements within the warranty period (like most blu-ray makers). Remember, twenty-thousand hours is like 800 plus days.
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Old 06-17-2010, 06:39 AM #230
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Default Re: 445nm Casio Laser Diode Compilation Thread

Quote:
Originally Posted by Eudaimonium View Post
There is a possibility of , how Dave and Hmike said it, multiple batches from different sources, which can have different qualities and capabilities.

We do need to keep an eye out for that, indeed.
Since someone else bumped this, I don't feel bad about going back a few days to this.

That small of a variation is just standard manufacturing variation. 2 diodes right next to each other on the same wafer can still have very different performance. Every one is unique, and even slight variability in manufacturing can make big differences in performance. Literally a few atoms is all it might take to change the voltage, even by multiple volts. Differences of less than a volt are really nothing to worry about, except that the lower voltage one is going to have to dissipate less heat than the other.
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Old 06-17-2010, 02:28 PM #231
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Default Re: 445nm Casio Laser Diode Compilation Thread

I was just thinking about this last night. I've just completed a second analog module and I've been burning them both in while measuring stability. The first diode makes almost 100mW more than the second at the same current, and the second diode's power stability is a bit worse than the first.. Both diodes are from the same projector. They each have their own personality, so to speak.
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Old 06-17-2010, 04:57 PM #232
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Default Re: 445nm Casio Laser Diode Compilation Thread

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Originally Posted by ElektroFreak View Post
I was just thinking about this last night. I've just completed a second analog module and I've been burning them both in while measuring stability. The first diode makes almost 100mW more than the second at the same current, and the second diode's power stability is a bit worse than the first.. Both diodes are from the same projector. They each have their own personality, so to speak.
Are they temperature controlled?

I'm running mine at 1A now and getting roughly 980mW from a cold start (after Hi-Power lens).
As it warms up, the power starts to drop 1mW at a time. At the 2 minute mark, the power is about 920mW. After 3 minutes, I lose about 100mW from start-up. The case temperature is slightly warm at this point. The power settles at about 870mW after 4 minutes.
Keep in mind that this is a portable unit, so heatsinking is not optimal.

I have not had the chance to test my second diode yet, but I think that the diode I am running now is not one of the "higher efficiency" diodes.
This diode seems to be very temperature sensitive.
I will need to get a IR thermometer to make any "scientific" observations...
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Old 06-17-2010, 06:14 PM #233
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Default Re: 445nm Casio Laser Diode Compilation Thread

Quote:
Originally Posted by RA_pierce View Post
Are they temperature controlled?

I'm running mine at 1A now and getting roughly 980mW from a cold start (after Hi-Power lens).
As it warms up, the power starts to drop 1mW at a time. At the 2 minute mark, the power is about 920mW. After 3 minutes, I lose about 100mW from start-up. The case temperature is slightly warm at this point. The power settles at about 870mW after 4 minutes.
Keep in mind that this is a portable unit, so heatsinking is not optimal.

I have not had the chance to test my second diode yet, but I think that the diode I am running now is not one of the "higher efficiency" diodes.
This diode seems to be very temperature sensitive.
I will need to get a IR thermometer to make any "scientific" observations...
My modules are fan cooled, so they never get too warm but I have noticed that they do drop in power by about 30-40mW over the first few minutes of use.. I'm only driving mine with 750mA of current. What are you using as a driver?
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Old 06-18-2010, 02:17 AM #234
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Default Re: 445nm Casio Laser Diode Compilation Thread

Quote:
Originally Posted by ElektroFreak View Post
My modules are fan cooled, so they never get too warm but I have noticed that they do drop in power by about 30-40mW over the first few minutes of use.. I'm only driving mine with 750mA of current. What are you using as a driver?
I'm using a MicroBoost.

For 2 minutes on 50% duty cycles, my set-up is good enough for me. As soon as it cools down a bit the power shoots right back up.

My next diode will be powered by something that can handle a little more current with a bigger heat-sink so I can do some real testing.
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Old 06-18-2010, 05:47 AM #235
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Cool Finally pushed it to partial destruction!

Finally damaged it ,drive current 2.3A and at 2.6W then it went to 1.8W and now operates at about 327mw at 650ma.

Knowing this you take .707 x the power that injured/killed it and you have the absolute maximum safe drive power which is 1.84W. This seems very consistant to a 2w diode, considering the axiz furrle is brass and the original aluminum is so much better of a heat sink.

You should get 500mw if you want life= FOREVER, 1W if you want a long service life of say 30,000 hours,and 1.5W+ if you want projector lamp lifetimes say 1000 to 3000 hours if you are lucky.
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Old 06-18-2010, 05:55 AM #236
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Default Re: 445nm Casio Laser Diode Compilation Thread

by 1.84 watts do you mean amps? This can surely handle more than 1.84 watts of drive power..... 1.84 watts of drive power would be like 350mW of output power.
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Old 06-18-2010, 05:56 AM #237
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Default Re: 445nm Casio Laser Diode Compilation Thread

Was your diode from a xj-a130 or a 140 model?
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Old 06-18-2010, 06:21 AM #238
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Default Re: 445nm Casio Laser Diode Compilation Thread

Quote:
Originally Posted by SpyderFire View Post
Was your diode from a xj-a130 or a 140 model?

Good question! Where did you get that diode?
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Old 06-18-2010, 06:29 AM #239
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Default Re: Finally pushed it to partial destruction!

I am very impressed with your findings and recommendations, it narrows down the capabilities and sets the limits of these diodes. I guess the initial recommendations of 1W max. went out the window! Quite impressive.

This helps me set the limits for the lab laser diode I am planning on building.

Thank you very much.

Jose

By the way, I am sorry for your lost.



Quote:
Originally Posted by heruursciences View Post
Finally damaged it ,drive current 2.3A and at 2.6W then it went to 1.8W and now operates at about 327mw at 650ma.

Knowing this you take .707 x the power that injured/killed it and you have the absolute maximum safe drive power which is 1.84W. This seems very consistant to a 2w diode, considering the axiz furrle is brass and the original aluminum is so much better of a heat sink.

You should get 500mw if you want life= FOREVER, 1W if you want a long service life of say 30,000 hours,and 1.5W+ if you want projector lamp lifetimes say 1000 to 3000 hours if you are lucky.
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Last edited by jmgallego; 06-18-2010 at 06:33 AM.
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Old 06-18-2010, 06:44 AM #240
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Default Re: Finally pushed it to partial destruction!

Quote:
Originally Posted by heruursciences View Post
Finally damaged it ,drive current 2.3A and at 2.6W then it went to 1.8W and now operates at about 327mw at 650ma.

Knowing this you take .707 x the power that injured/killed it and you have the absolute maximum safe drive power which is 1.84W. This seems very consistant to a 2w diode, considering the axiz furrle is brass and the original aluminum is so much better of a heat sink.

You should get 500mw if you want life= FOREVER, 1W if you want a long service life of say 30,000 hours,and 1.5W+ if you want projector lamp lifetimes say 1000 to 3000 hours if you are lucky.
And just where did .707 come from?

That number sounds familiar...maybe from Weibull or some other reliability stuff, but I'm not certain.

Last edited by pullbangdead; 06-18-2010 at 06:50 AM.
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445nm, brain farts, little 445nm info, too much driver





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