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Old 07-25-2015, 07:45 AM #49
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

I understand the cans are pinched in place while in the block, but if it was meant to be a gas tight seal you would think that it would be sealed onto the diode base as well as trapped on in the block. I just cant see them being nitrogen filled and not hermetically sealed. But I have been wrong before.


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Old 07-25-2015, 09:48 PM #50
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

Quote:
Originally Posted by planters View Post
I think these are the most exciting of the new blue diodes. The color and the far field beam are the reason. What I would like to know is what are the near field beam dimensions.

When I looked at the NUBM 44, I measured approximately 7mm x 3 mm at close to 20 cm from the diode. A six diode module built from that diode would give 40 W and a 7mm x 9mm beam. This would be the result of knife edging three diodes and PBS combining another three into that beam.

Despite the lower power of these diodes would the near field beam dimensions allow for a more compact beam?
Sorry, Should have put it in larger text but if you look right bellow the 3rd image in the OP i posted it but it wasn't very clear so i re did it.

So ill be clear here:
Beam size near field is ~1.85mm x 3.2mm for the NUBM07E @ 3.5A. This measurement was taken at 9"-10" from the actual G-lens. I used a dichroic mirror that passes the blue @ a 45 and measured the back reflection waste beam that comes off it.

Please take into account some error on this measurement. Say Up to +/-0.1mm or so.

Its Good.

It is very hard to measure this. Ive always had a hard time measuring this with high power diodes. Anyone has any better ideas to measure this.? I was thinking of using a FS mirror when i get home and put it on a 45 and measure the little light that passes through it. I think that may be more accurate and easier to messure.

How does everyone else do it.?
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Old 07-25-2015, 10:57 PM #51
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

Never had to measure anything that high, but
probably would bounce off a piece of glass and
white plastic vernier caliper
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Old 07-25-2015, 11:04 PM #52
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

I think your measurement technique is good. I use a HR broad band mirror I obtained from OSLS that reflects about 98% 0f the 445 @ 90 degrees and send that to the dump. I measure the 2% beam against a common black oxide finish that you find on a lot of machining blocks and risers etc. This is less reflective than standard black anodized aluminum.

Is the 1.85mm the slow dimension that ends up at 65 mm in the far field?

In any case this is fantastic. A 6 diode module might have a 6mm x 3mm beam and put a very conservative 24W downfield in a 3mm x 10mm (based on my expansion results with the nubm44). This is a 470nm beam as well. This would also fit onto a conventional projector scanner mirror.
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Old 07-25-2015, 11:13 PM #53
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

I usually shine the laser on a LPM and move a pair of calipers in the beam. I start adjusting the calipers down until I see a 3-5% reduction on the meter. I do this in both axis. I used acid to blacken a pair of calipers at the tips just for this purpose. Usually the beam measures a lot less that it appears to the eye. Also, I should mention, the SA seem to increase in width in a linear fashion with current. So, the measurements should be taken at the full current.

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Old 07-26-2015, 12:30 AM #54
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

Quote:
Originally Posted by The Lightning Stalker View Post
Never had to measure anything that high, but
probably would bounce off a piece of glass and
white plastic vernier caliper
Thats pretty much what i was doing. The problem is you get the dual beam reflection that way. Thats the problem i was having as using glass is basicly the same thing i was doing. Passing the blue and messuring the reflection but there is a 2nd reflection that makes it harder to messure.

Using a HR for Blue Mirror rather then a Pass Blue mirror what Planters said is a better idea which i like better. Which in turn wont give you that 2nd reflection beam becauseyour messuring the pass beam. NICE.

Quote:
Originally Posted by planters View Post
I think your measurement technique is good. I use a HR broad band mirror I obtained from OSLS that reflects about 98% 0f the 445 @ 90 degrees and send that to the dump. I measure the 2% beam against a common black oxide finish that you find on a lot of machining blocks and risers etc. This is less reflective than standard black anodized aluminum.

Is the 1.85mm the slow dimension that ends up at 65 mm in the far field?

In any case this is fantastic. A 6 diode module might have a 6mm x 3mm beam and put a very conservative 24W downfield in a 3mm x 10mm (based on my expansion results with the nubm44). This is a 470nm beam as well. This would also fit onto a conventional projector scanner mirror.
Sweet.! Going to try it your way. Way better then what i was doing as there wont be that 2nd beam reflection.


Yes the 1.85mm is of the 65mm Far Field size.

I'd say its Near 470nm because it really all depends on the current and Temp one runs it at. It really matters on these just like the 462nm diodes. They have a much larger swing then 450nm diode that typically are only a few nm or so.

I just dont want to miss lead anyone. I dont know the temps and Current everyone plains on running these at so expect 465nm-470nm at ~4A bassed on the temp one plains on running it at.

Having said that....

Iam thinking if we run these around 4A it will probably fall around 468nm at ~25C. Though i dont think many plain on TEC cooling to regulate these diodes at 25C since the heat added from the TEC to cool say even 2 of these diodes Cubed @ 25 will be crazy without say water cooling the TEC's or something. So more then likely everyone will use a larger heatsink or copper mount to mount the diode in then to the module base or to the actual base plate of the projector.(Which may not even be enough) in a projector with no TEC's we will probably be at temps around ~40C-50C at best after running for about 30 min - 1 hour or so unless someone is using a very very large mount and large projector.. So then yeah i guess your right as ill say we will be at 470nm too at those temps.

The mount you see i used in my pictures Even that size mount mounted to my table will reach 40-50C in about 30 minutes being on straight. SO copper will be the way to go but even still we may need to add TEC's to keep it around 40C. Especially on a 6X module. WOW Thinking about it. TEC's or water cooling will be a must to keep it small.

I can see it now TEC's wont be the way to go on more then 2x or even 4x modules. More then likely a CPU style radiator or 2 with a custom water block mount that the diodes are in or that the diode modules mount too will be needed That should hold the diodes at around 40C on its own. Hmmm thats got me thinking now. We may be able to find a nice balance.

This is all very exciting because we have yet to really get into using these new High power diodes. Not many have used them yet in builds. So we have some new stuff to deal with and work out thats for sure with cooling.

Iam pretty sure we can use a CPU water block for a dual diode cubed setup just fine if one cannot go custom. But for more then that a custom water block will be needed.


We need some more diode testing an i have some more on the way to get some more WL measurements to see where typically these fall around but looking at the datasheet id say that my diode falls as a typical diode in the WL and power range. Iam sure there is probably going to be some Higher Binned ones that do higher in WL but i think this diode i tested is the typical WL we will see.

As for the cooling side of things. I need a Mill. Going to look into making some custom modules or water cooling plates.


Quote:
Originally Posted by logsquared View Post
I usually shine the laser on a LPM and move a pair of calipers in the beam. I start adjusting the calipers down until I see a 3-5% reduction on the meter. I do this in both axis. I used acid to blacken a pair of calipers at the tips just for this purpose. Usually the beam measures a lot less that it appears to the eye. Also, I should mention, the SA seem to increase in width in a linear fashion with current. So, the measurements should be taken at the full current.
Yes thats why i took it at 3.5A. Pretty close to full power which should be at 4A or so. I noticed with Red diodes this is much greater then with blues. But your right. Should always be taken at full current.

Do you have your calipers rigged up to a stage.? My table is at a normal table level so trying to get my hand steady for that will be very hard. I could though hook it up to an X/Y, stage for increase accuracy.
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Old 07-26-2015, 03:06 AM #55
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

I agree that unless you want to go to phase change cooling/refrigeration then I would forgo the TECs. However, I really like the closed water cooling systems for CPUs from companies like Corsair. These are quiet, very, very effective, they don't leak and they are cheap. I think four diodes per cooler would be about right.

Until you get your mill and maybe even after you will want to look into one of these.
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Old 07-26-2015, 04:01 AM #56
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

Quote:
Do you have your calipers rigged up to a stage.? My table is at a normal table level so trying to get my hand steady for that will be very hard. I could though hook it up to an X/Y, stage for increase accuracy.
Usually i clamp the calipers in a small machinist vise and slide it on the table. Surprisingly, its not hard to get it positioned very easily. On wider beams, I have just rested the calipers on the table. My ophir meters response is fast, so that helps.

I have a diode coming from China and a spectrometer on order as well. I will post some results asap. I have wanted a spectrometer for years. I'm pretty stoked to get both!
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Old 07-26-2015, 11:12 AM #57
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

Quote:
Originally Posted by logsquared View Post
Usually i clamp the calipers in a small machinist vise and slide it on the table. Surprisingly, its not hard to get it positioned very easily. On wider beams, I have just rested the calipers on the table. My ophir meters response is fast, so that helps.

I have a diode coming from China and a spectrometer on order as well. I will post some results asap. I have wanted a spectrometer for years. I'm pretty stoked to get both!
I will give this method a go too. I have an Ophir head too.

AWESOME!!! What Spectrometer did you buy? I have the Sciencesurplus B&W one. Works Great. I just wish that it had 1 feature that would handy for me and that is to always display the WL in a TEXT box next to the peak just like you see in my images.. I hate that you have to manually keep putting and dragging it there in order to see that displayed correctly at the peak rather then always zooming in to see the exact WL.

In other words the number box does not track with the peak you have to manually drag it there.


Thats pretty much the only feature i wish i had because my computer right now "Till i get a dedicated computer for it" is across the room and every time i get a reading and increase the current when i have the spectrometer running in continuous sample mode, i have to constantly keep moving the cross hair to the peak in order to view the exact peak WL numbers or even more a pain in the ass is to have to zoom in every time. I wish i could view the box across the room and thats what i really want it for.

So i want something that always displays the peak in numbers somewhere on the screen.

It can be in its own dialog box or next to the peak it doesn't mater i just want it to be tracking.

I think some of the Ocean Optics ones displays it on the top i think in a box. But iam not sure if its tracking or you have manually hit sample every time. Does anyone know which one does.?


Iam actually looking to buy another spectrometer as my meter only goes from ~370nm - ~900nm. Which is good for the visible stuff but i deal with alot of DPSS laser and it would be nice to have a meter with up to 1400nm range.

Ive been looking at the LR1 for a few months now. It can be custom adjusted to do up to 1400nm as i need:
http://www.ebay.com/itm/USB-spectrom...item337cda003b


As well as i think it always displays the peak WL and has live tracking. Does anyone know to confirm this.?


Planters, what spectrometer do you have, whats the range on it and do you know if it has live tracking? IIRC i think i noticed it on the bottom right of your screen on one of your videos that it displayed the WL in a dialog box and was looked like it was live tracking the peak. Is it?
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Old 07-26-2015, 01:45 PM #58
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

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Planters, what spectrometer do you have, whats the range on it and do you know if it has live tracking? IIRC i think i noticed it on the bottom right of your screen on one of your videos that it displayed the WL in a dialog box and was looked like it was live tracking the peak. Is it?
I have the LR1 and you can order a custom wavelength range. I have been unable to have it display the peak wavelength. Rather, it will display the wavelength that I drag the cursor to with the mouse.
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Old 07-26-2015, 02:43 PM #59
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

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Originally Posted by planters View Post
Rather, it will display the wavelength that I drag the cursor to with the mouse.
Dang. Thats exactly like mine.

But when you leave the cursor there does it update on its own or do you have to move the mouse again to get another update?
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Old 07-26-2015, 05:40 PM #60
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

You have to move the mouse. However, the Canadian gentleman that builds these coupled the Labview software to the spectrometer. He seemed helpful. Maybe, if when you made the order, you could request that modification of the software for this function.
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Old 07-30-2015, 11:10 AM #61
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

Why is there so little interest for this diode?
Output and wavelength are amazing.

Techhood sold none
Existotem sold four diodes to three people.

Only three people in the world have this diode?
Are there other sellers?
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Old 07-30-2015, 12:10 PM #62
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

I buy all my diodes from DTR and he has not listed this diode yet.
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Old 07-30-2015, 12:29 PM #63
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

I'm with planters on this one! I rarely buy diodes anywhere else unless I extract them my self or from my fathers batch haha
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Old 07-30-2015, 02:34 PM #64
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Default Re: NUBM07E 465nm 2.9W Diode Test (Hitting 470nm+)

Yeah most people wait to buy from Hobby re sellers to support.
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Last edited by lazeerer; 07-30-2015 at 04:15 PM. Reason: re worded it.:)
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