Help if possible on laser project

[ArcticDude]

Cruel dude, showing me a photograph of such a sublime instrument like that, I'm drooling, nice laser. Now about climbing that tree, turn the other way around, much easier and doable!

I wasnt meant to be rude or harsh. Sorry if that came out of like that.

I have some mechanical engineering background. First three years of that education we just draw things. Planning, drawing - more drawing, more planing. If task was plan/draw something, first thing to do usually was study, if that subject was already sudied.

Fourth year of eduication we were allowed to build some of easiest projects.


Are you actually in believe that somebody is able to help you if you say: Help me, I'm engineering this device. There's gonna be heatsinks and fans and lasers and stuff?

So, try to understand why I'm finding this kind of approach little awkward


Secondly,
I really don't have such knowledge or expertise about light emitting devices / lasers as Diachi or Paul. -But even I was able to find similar devices as described. All that just two minutes of Googling.

The essence of beam combining does not differ that much, technique is basicly always the same.

 

[CurtisOliver]

It's alright ArcticDude. Alaskan was referring to the brilliant laser you shared in your post. You're taunting him. :eg:
Anyway, good post. :beer:

 

[jimmy433]

Thanks i will definitely look into that device, the drawing was suppose to give you an idea of the device i was thinking of not meant to be professional (also it should be 15a not 5). I can give you calculations (watt waste of diodes, amperage the device draws, etc..), but why are we getting into my project management and engineering experience? im obviously in my first years, do i have to send you a project plan document with feasibility analysis and time management predictions just to get some help on which laser driver to use? the project has not begun yet and i dont plan to do any formal planning until i need to (as im also lazy).

All im trying to do get is a head start on things with the help of your experience, things like the best way to cool a 1W diode? iv looked at a 30x30x50mm heatsink but have no concept of how well this works with a runtime of around 5 minutes. If you dont wish to help thats fine its not like im trying to get your bank details or anything.

 

[CurtisOliver]

This is my final attempt to get through on why the diode choices don't make sense. This is a colour calculation on what you could expect to see with a 1W 520nm and 0.4W of 660nm. The 660nm gets completely swamped by the 520nm. Now due to the profile it is possible that near the centre of the spot it will hold a little bit more colour but it will still appear green.

Also, I have already explained that using multimode diodes with single modes doesn't make much sense either. This is what the beam profiles will look like together. I didn't account for actual specs but it will give you a rough idea.

The multimode will diverge at a higher rate than the single mode. And when leaving the fibre cable you might as well have two seperate beams again as the single and multimode outputs will diverge at completely different rates to each other. A fibre cable is not a magical fix or a combiner.

In order to get a yellow (580nm) you would need 400mW of 660nm and 60mW of 520nm.

The CIE Plot spectrum is slightly off. Where 580nm is, would be where true yellow lies.

And lo and behold! That sits quite nicely with a single mode 520nm.

50mW 520nm PL520 Green Copper Laser Module W/Microboost Driver & Aixiz Glass | eBay

To me that would be problem solved. But apparently you are not allowed to change the diodes. So I don't really know why I bothered giving you all this.

Also the cooling doesn't need to be as drastic as that for a 1W diode. Yes the module will need proper heatsinking and maybe fans to run continuously without problem but having tec's is a bit overengineered to be honest.

Well this is my 2 cents. Although I get a feeling that this will be ignored like the others worthy efforts.

 

[jimmy433]

No Curtis thank you very much, this helps me a great deal in understand where your coming from and i will use this information to ask why exactly we are using these diodes and what we are trying to achieve.

 

[CurtisOliver]

You're welcome. I'm rather curious to find out why they are making you use an 1W NDG7475.

 

[Alaskan]

I wasnt meant to be rude or harsh. Sorry if that came out of like that....

I was just chiming in, that and the photo you posted of that lovely fibre combiner, wow! Lovely creation, wish I could have something like that but I don't want to pay the price tag. Fiber combining has been an interest of mine for a long while now, but such precision is required, that and using the right diodes etc., too much of a challenge for me.