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Custom wavelength adjustable 462-470nm 2.3w NDB7675 build 2.7a blackbuck M8

badboybilly

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So my version of what a perfect laser should look like, who said you need threads on a laser, this turned out just as I imagined, from a solid bar of alloy all machined on my lathe to precise press fit pieces, My plan from the start was to push a NDB7675 hard and be able to adjust the current with the outer pot as desired, since I was to use this diode a 2 cell host was my intention and a 30mm copper heatsink for the diode would be sufficient ,it's a DTR direct press heat sink with an alloy plug thermally bonded to the rear of the diode and sink, it was machined precisely also and pressed into the head of the host at the end of the build, the whole front section of the host is now a heatsink, I wanted a very solid host so it was tough to get all the components into the head , with the diode module the angel eye switch the potentiometre and the driver module there is bearly enough room left for the wires, thermal sensor-resistor and switch resistor,
I went with a red LED switch as I have a custom build with a blue already and liked the red more,
The temporary rubber washer-spacer I added to the hosts join, I think gives it that extra uniqueness, but also is a guide for me as if I press the 2 halfs further it is difficult to open again,
I used a stainless laching safety switch on the rear to complete the ground and initiate power,
To get the angel eye switch sitting nicely in the host I had to purchase a solid carbide slot drill bit witch arnt cheap and had to use the mill, the driver pill was also milled,
I was surprised to see 2.35w at 2.7a I was hopeing for a less efficient diode and more wavelength shift but it's still very sky blue, very similar to my 4.5a NUBMO7E, I'll add pic comparison a bit later,:thanks:

Pic heavy!!!!!!
 

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badboybilly

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BowtieGuy

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That is one NICE build bbb, the attention to detail is evident; a true labor of love! :beer:
The machine work, fit and finish, all super; I can appreciate the time and effort involved in the construction of this beauty!
:gj: and :kewlpics:

+rep as soon as I can. :)
 
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Benm

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How does this wavelength adjustment work?

The only way i can think of doing that is to control the diode temperature, but that typically has a change rate of something like 0.2nm/K, so to get 8 nm of adjustment range you'd need a temperature change of something like 40 kelvin/celcius.

From the photos it looks like the diode is very well thermally connected to the host directly with no TEC/TEH system in between.

Mechanical build is amazing though :)
 

badboybilly

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Thanks guys!

yes Ben I'm no expert buddy but there is a dramatic change in wavelength when adjusting the pot from 0ma to 2.7a especially after 20 seconds of the diode warming up, I will try and do a video of the change in color,

As I said it's exactly the same sky blue as my NUBMO7E at 5w, If not brighter!

People exadurate all the time here but I think I'm very close to my statement, we all know the NUBMO7E can get beyond 470nm and it also has been shown the NDB7675 can reach beyond 470nm at 2.7-2.9a

Anyone point me to a spectrometre for sale link, possibly on eBay, I can't find any!
 
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paul1598419

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Wow, that is a very nice build. Mostly all your own design, for the host. You can see the amount of work that went into it. I was wondering the same thing Benm brought up. Do you have any way of measuring the wavelength? Regardless, a super nice job!
 

badboybilly

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I wish I did buddy,
These two photos show a good comparison though!
On the left the 2.3w NDB7675 and on the right the 5w NUBMO7E I'm supprised myself it must be close as it's nearly the same tint-brightness as the 5w

Other pic turned down to near minimum output and a very obvious change in wavelength closer to a NDB7875,

What do you think!

Regardless of the exact wavelength adjustment I set out to build exactly what I accomplished and love that I can change the current at the turn of a pot, I haven't seen anything similar done and I believe this build is awsome, I might do the NUBMO7E next at max 6amp that will be something really special! Also it wouldn't be hard to chuck a Tec behind the diode if that was my plan.
 

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