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NDB7242E diode build

Pman

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I finished this build and Lazerman121 really wanted me to post it so here it is. This is a multimode 50mW max rated somewhere between 440-455nm and you would not guess that it is not a single mode. He has been selling them for awhile but they never seemed to get much attention and that's a shame. I do plan on building another one at a much lower output as the wavelength shifts a lot and I want to see the difference between it and a 450nm a bit better. My pics cant pick it up because I really need a filter to stop the bloom on the dot but the dot is sharp and round.

3.8mm diode pressed, soldered with an x-boost with some Arctic Alumina stabilizing everything and a small heat-sink on the driver that isn't needed but I'm in the habit of doing it anyways:




Leadlight/laser66 board with button and an LED glued onto it:


Soldered negative wire onto the board:


A different negative wire soldered to the LED and a positive wire soldered between the LED and switched side of the switch:


Other side of the original negative wire soldered to a piece of flexible copper to pick up the negative from the battery off the host wall:


Negative and positive wires from the driver soldered to the appropriate board points:




A word about my setting. I did not do a thorough plotting points on a graph type of diode check to see where the curve was or anything but I noticed that it will put out quite a lot more and maybe up to 300mW but you would really be shifting the wavelength high. AS far as I know no-one has even built theirs to hit 3 digits. I deliberately set mine to hit just over 200mW and I have't noticed any issue. That is 4 times the rated max output of these! I am NOT suggesting anyone else do this although Alien will likely try lol;) (just teasing my friend).
Output with an acrylic lens:


Output with a G:


Finished laser with a black end cap, button and focus knob:


Indicator light:


Labels added:


The LED is really bright on this one:


There's no fog necessary for beam shots because of the power density. Also, all the pics were taken with an acrylic lens and not a G:


Trying to show the small dot off a Matt black background but it's very bright. About 20 feet away:


The problem with pushing it so hard is not being able to get a good sense in the difference in how it compares to a 450nm single mode. I used a PLP450 at 380mW to try and compare as that diode was being pushed hard too but my camera doesn't pick up the difference well compared to what I see plus the PLP has almost twice the output. The NDB has a WAY nicer dot. What I see is the NDB7242E has a definite violet hue in comparison that I can't show you well but here's the pics. NDB on the right. This is the reflections off of a black surface:


NDB is on the left obviously unfocused against a flat white background. See how the center is white and then blue. Look at the outside edge though where it looks violet and compare that to the lighter violet of the one on the right and you should notice the difference:


Against a flat black background with NDB on the left. Same thing here with the outer violet part for comparison:


If you saw these yourself you would immediately see the difference.
IF you don't have one in your collection I would HIGHLY recommend it although Lazerman is currently out of stock but thinks he will be able to get more and he would like to know how many others may be interested here:
http://laserpointerforums.com/f39/ndb7242e-445nm-diodes-91339-3.html#post1407561

Thanks for looking and it was a pleasure to serve and inform:beer: (I don't drink but you get the point)
 
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Ricker

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Wow that was just too awesome Pman! Not better way to build that for a rare diode like that! Lazerman I'm sure is very happy seeing this! I find the best part is the divergence of this multimode whom acts/looks like a singlemode! Thanks again for the amazing build thread again Pman! You're an inspiration to us all. :)
Nate
 

Pman

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I added that there's no fog in the shots as it isn't necessary with the power density of this diode. It's the point I've been trying to make about how I wish the relative brightness calculator could take divergence into account. 200mW of blue with a wider beam doesn't compare to 200mW of blue with a thinner beam. Divergence is really important for visibility and I find it far more impressive to see a lower divergent beam than a thicker beam so it looks more like it could slice something rather than a flashlight.
 

BowtieGuy

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Nice looking diode and build Pete. It would definifely be interesting to see this compared side by side with a much lower powered version to see if there was any visual difference!
 
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Dude thank you so much for the review I always wondered why the diode had a max rating of 50mW and an Absolute max at 200mW. I always found that strange.

I have a diode I bought for myself a wile back and I plan to make a 5mW pen out of it. In my test 3 element lenses give the best beam.
 
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Alien Laser

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Very nice build what driver did you use to get 200mW whauu nice :gj:
i will try to push it over 200mW , but first i have to check if i can get more diodes from him before the test :)
 
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Pman

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Alien please don't think I'm asking you to push one really hard. I was just joking about it as you really like to max things out. I will show the difference between running it at a much lower output by the end of the week. From my reading about it wherever I could find information it should be much more violet the lower the output. I don't think I could set it for under 50mW as an actual finished unit though as I like beams and not just a spot on the wall. I'll get a pick at 5mW if I can anyways using the same camera.
The driver is an x-boost s mini I think. Will have to look it up. It's not the one that says temporarily out of stock.
 
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Benm

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Nice build!

I guess it's nice to have an afforable option with a bit lower power for pointers and such, especially if it has decent beam specs for a multimode.
 

Alien Laser

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Alien please don't think I'm asking you to push one really hard. I was just joking about it as you really like to max things out. I will show the difference between running it at a much lower output by the end of the week. From my reading about it wherever I could find information it should be much more violet the lower the output. I don't think I could set it for under 50mW as an actual finished unit though as I like beams and not just a spot on the wall. I'll get a pick at 5mW if I can anyways using the same camera.
The driver is an x-boost s mini I think. Will have to look it up. It's not the one that says temporarily out of stock.
nice am trying to get 2 more so i can test one i love testing diodes and see the shift in color :whistle:
 

Pman

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I don't know if I accidentally posted more information on this diode in the wrong spot or somehow never hit post but here's some other information about it.
The engineering data sheet that lazerman sends out with it is kind of odd in that it has an initial output max of 50mW but then it also has an absolute maximum setting of 200mW that I didn't even notice until Lazeerer pointed it out as its in a different seperate spot from the rest of the information. Don't remember seeing it that way in any data sheet from any other diode. It doesn't list a minimum or typical output but just leaves those blank. So, that's why I believe the diode can be set much higher although it's likely the wavelength is going to shift into the normal range of a 450 or higher so the question is whether you really want to run it that high or not. They might also be like those 515nm GB diodes where its just luck of the draw which wavelength you end up with.
It shows the dominant wavelength to be from 440-455nm and the threshold current to be from 10-50mA with an operating current of 45-125mA and voltage between 3.5-5.5V.
I'll go back and edit but all those pics were taken where it had the acrylic lens on.
I also went back and explained in the last 2 pics what to look at to see the color difference.
 
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Alien Laser

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I don't know if I accidentally posted more information on this diode in the wrong spot or somehow never hit post but here's some other information about it.
The engineering data sheet that lazerman sends out with it is kind of odd in that it has an initial output max of 50mW but then it also has an absolute maximum setting of 200mW that I didn't even notice until Lazeerer pointed it out as its in a different seperate spot from the rest of the information. Don't remember seeing it that way in any data sheet from any other diode. It doesn't list a minimum or typical output but just leaves those blank. So, that's why I believe the diode can be set much higher although it's likely the wavelength is going to shift into the normal range of a 450 or higher so the question is whether you really want to run it that high or not. They might also be like those 515nm GB diodes where its just luck of the draw which wavelength you end up with.
It shows the dominant wavelength to be from 440-455nm and the threshold current to be from 10-50mA with an operating current of 45-125mA and voltage between 3.5-5.5V.
I'll go back and edit but all those pics were taken where it had the acrylic lens on.
I also went back and explained in the last 2 pics what to look at to see the color difference.


Ahh nice i see the color difference sweet ::san:
 

RedCowboy

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It looks like a nice beam and I do appreciate beam quality, I have some 660nm and 532's that are pretty good, I have done the replacement slid focus long FL lens to get 532's to a sharp point in the clouds.
But I have become an incurable power junkie and right now I want to combine/converge lots of powerful lasers.
 

Pman

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Well, hold onto your hats as I just completed the diode testing. I did say that I thought this diode could put out more and I was right:) This diode is not what people thought so pay no mind to that 50mW max rating. The real rating is the 200mW max one.

Here's the data. If someone wants to change it to a graph that would be nice too. Testing done with a G2 lens:

mW mA V
4 23 3.8
10 30 3.9
22 40 4.1
32 50 4.2
43 60 4.3
54 70 4.4
64 80 4.4
78 90 4.5
90 100 4.6
100 110 4.6
108 120 4.6
122 130 4.8
131 140 4.8
140 150 4.9
145 160 5.0
156 170 5.0
167 180 5.0
178 190 5.1
189 200 5.1
202 210 5.1
221 220 5.1
233 230 5.1
244 240 5.1
256 250 5.2
266 260 5.2
273 270 5.2
286 280 5.3
310 290 5.3
325 300 5.3
335 310 5.3
345 320 5.3
355 330 5.3
364 340 5.3
373 350 5.4
382 360 5.4
393 370 5.4
402 380 5.4
412 390 5.4
420 400 5.4

I honestly don't know how much more this diode will put out but I didn't want to take a chance and blow it. It wasn't showing signs of distress though so you can guess what I intend to do. Going to try building it at 400mW output and see if it can handle it. In all my testing I've found that running off of a variable DC power supply is WAY nicer to diodes than a driver. Cross fingers;)
If you want another way to look at the data it is very close to what Jordan shows on his site with the PLP450 that is a 5.6mm diode (this one is a 3.8mm).

Honestly it was too hard to notice any change in wavelength doing the test but here are some pics:
5mW:


50mW:


100mW:


300mW:


400mW:


204mW from my already built pen and 50mW. There was a difference but my camera didn't pick up on it.


408mW readings. Yes, you usually see me post pics with red LED but I have another panel on the opposite side with blue LED:)


 
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Ricker

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Great job again Pman!! Thank you for compiling the data for the list of mW's, A's, and V's! +rep when I can!
 




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