574nm 36 mW Yellow Laser

[steve001]

Aren't there members that can machine hosts?

 

[Nexgen]

I noticed you sold the handheld 575nm laser you built. What kind of duty cycle did it have outside the lab host? Seeing how hot the original driver got, it must have gotten warm to the touch within a limited time frame. :thanks:

I would say 2-5 minutes is ok. Didn’t notice any thermal shutdown, this driver worked fine with 2A current(in previous laser), within 5-10minutes. In case of 575nm it’s 1.2A. Seems really reliable. Module not heating up. :shhh:

Edit: when I’ll be in the price range for some hosts and drivers, I’ll contact CNI. It’s pleasure to assemble lasers for someone as I did.

 

[paul1598419]

What exactly are these CNI hosts made of? I'm sure they aren't so complex that they can't be replicated. Just will cost you more to get it done.

:thanks:, Nexgen.

 

[Nexgen]

What exactly are these CNI hosts made of? I'm sure they aren't so complex that they can't be replicated. Just will cost you more to get it done.

:thanks:, Nexgen.

They are simple aluminum hosts with top thread to secure 20mm module and nothing else. Space for battery is thighter , likely 19mm.

 

[Alaskan]

I took the module out of my 577 nm heat sink, it's 20 x 30 mm with a c-mount diode in it, but I didn't open it further, glued. I have a spartan host from a low power red laser diode assembly I'm putting it in but need a 18 mm battery contact board with spring and a 50 mm length of 20 mm diameter 1 mm wall brass tubing to duplicate the 80 mm length of the module which was in there before.




577 nm module on the left side, original 638 nm module, right..

 

[paul1598419]

Have you got a driver picked out to drive this in that host? Just curious as the case is said to be positive.

 

[Alaskan]

I've been looking at the candidates, I like this one: https://d11fdyfhxcs9cr.cloudfront.net/templates/58770/myimages/documentation_bbv4_small.pdf

 

[paul1598419]

You know you will have to isolate the module from the rest of the host. With that said, I'm looking forward to seeing how this turns out. :yh:

 

[Alaskan]

There's probably just enough room to put a thin heat shrink tube around the module, it's got to be thin though, if not, it won't work without modifying the host to be slightly larger OD inside.

Edit: I found something better, this adhesive heat sink tape is uber thin, will work if cut into strips running down the length of the module spaced around it, I don't want to use a large layer for fear I won't be able to remove the module later, if I want to, it's meant to be removable, but wrapped all the way around as one solid piece, not sure it will.

https://www.ebay.com/itm/142815791947

 

[RedCowboy]

You could have a standard cylinder style heat sink made to fit around the module that also fits into a host, only have the heat sink cut into 2 halves, then wrap your module in silicon thermal tape and place the 2 halves heat sink around the silicon wrapped module then slip it into your host. The heat sink would need to be sized for the laser module plus the thickens of the silicon tape.

https://www.ebay.com/itm/8mmx25M-Do...144678&hash=item2a816c277d:g:ScoAAOSwX61ZCv-s

 

[Alaskan]

I didn't see your post until after editing my last one, so as not to double. That would work too, lemme see if the .03 mm thermal tape works out, there appears to be enough room in the Spartan to use it.

 

[RedCowboy]

Yes that thermal tape you found looks thin, but if you end up having a host made the 2 pieces heat sink would make assembly easier. :beer:

BTW I bought some 1W NUGM diodes at auction and they are not 520nm like my NDG7475, they look like possibly 525nm, they are noticeably more of a yellow green next to the 7475, it's still very much green just obviously not 520nm.

 

[Alaskan]

Just that I like the Spartan for a host so much

 

[kecked]

All please I beg that those who make these into handhelds keep these away from fools who might aim them at planes. This yellow is highly dangerous to eyes and much brighter mw for mw than the greens. These could really cause the final push banning anything over 1mw. 575nm is right in the most sensitive range of the eye and is why they use it for surgery. Preach over.

 

[CurtisOliver]

That's a primary concern of any handheld we produce regardless of power and wavelength. We don't like anything our members produce going into the wrong hands.

 

[BowtieGuy]

I agree, Curtis, that's a given with any laser that we build. I'm pretty sure any of our members that are qualified to build these into handhelds, will do their best to be sure that these stay in good hands.