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Picking my first laser build

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Hey guys I'm trying to pick parts to build my first laser, I found this small housing kit on ebay: https://www.ebay.com/itm/Waterproof-Adjustable-Focusable-Housing-Case-for-Laser-Pointer-Hunting-DIY-Kit/191108979001?epid=5005460681&hash=item2c7efb9939:g:hpMAAOSwf05XOqrp

What would be a good 650nm diode to fit in it and driver etc.
It is one of those generic hosts so I thought the dimensions would be familiar to most experienced builders.
Looking for a low price components atm in case I destroy them.

Survival laser has nice kits but they are not exactly low budget, although if its worth it I might consider going with a C6 or something.
 

Gazen

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I’m not sure of the dimensions on the eBay kit do I couldn’t help you there, but I recently used one of those c6 kits with a 490nm diode and they’re nice, very easy builds.

If you want an easy 1st build to get a feel for builds, it’s a good idea, but if you want more of a challenge I would go with something else.


Good luck!
 
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I’m not sure of the dimensions on the eBay kit do I couldn’t help you there, but I recently used one of those c6 kits with a 490nm diode and they’re nice, very easy builds.

If you want an easy 1st build to get a feel for builds, it’s a good idea, but if you want more of a challenge I would go with something else.


Good luck!
Which one is an easy 1st build, the C6 kit?
Thanks :)
 
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Gazen

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paul1598419

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If you are looking for a good single mode 650nm diode, the LPC-836 or LPC-840 will put out 400 mW when driven at 400 mA with a single element aspheric lens. Might have to go a little higher on current if the diode is not particularly efficient. Both are case negative, so you can use most any driver that will put out 400 mA at ~3 vols Vf. That excludes boost drivers.
 

Gazen

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If you want something a little flashier you could get the discount bundle for survivallasers, but choose the stainless steel host.
 

LewDude

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The link that Gazen posted is a sure-fire winner. By far most economical and sturdy. And if you are in CA, you'll get it quick. If you do decide on diode / driver current before you order, they offer some set-non-adjustable drivers, or you could go with an adjustable driver if you are comfortable setting the current yourself.

Good luck! And take your time hooking everything up :D
 
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LewDude

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Yes, the adjustable drivers have the pot(entiometer) that allows you to adjust the output current. As for 440ma, I'd let some other weigh in on that, but I've usually kept mine more around 350ma, 400 at the max.

For the module - SL sells them as well: https://www.survivallaserusa.com/Diode_Modules/cat1667093_1540973.aspx Those LPC-836 and LPC-840 diodes are 5.6mm. The ebay link is for a 9mm module, so that one specifically will not work for these diodes. You'll need to be able to press the diode into the module, typically requiring a diode press (also available at SL) or a cleverly devised household item. I'm willing to help you out if needed with any of the above - PM me if you'd like!

There are lots of options for buying diodes already pressed into a module, and lots of diode options if you you are worried about 440 possibly being too high.
 
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paul1598419

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I would not try setting the current to 440 mA. It is just too high. I have one that is just under 400 mA doing 385 mW with an aspheric lens. It makes a nice tight beam and dot. I use copper modules as they can take and carry away heat better than the nickel plated brass ones. I have both in my stock as some people prefer the brass ones because they get hotter and can cause some diodes to shift up in wavelength.

I would stick to 400 mA or maybe a tiny bit more if you are trying for 400 mW and are almost there. You could actually start around 380 mA and measure the power, then decide what you want to do next. At least these diodes are not expensive at all. You should get at least two. More, if you can afford it. I stll have at least one LPC-840 in my stock.
 
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I would not try setting the current to 440 mA. It is just too high. I have one that is just under 400 mA doing 385 mW with an aspheric lens. It makes a nice tight beam and dot. I use copper modules as they can take and carry away heat better than the nickel plated brass ones. I have both in my stock as some people prefer the brass ones because they get hotter and can cause some diodes to shift up in wavelength.

I would stick to 400 mA or maybe a tiny bit more if you are trying for 400 mW and are almost there. You could actually start around 380 mA and measure the power, then decide what you want to do next. At least these diodes are not expensive at all. You should get at least two. More, if you can afford it. I stll have at least one LPC-840 in my stock.
I will keep that in mind thank you.
Do you think its possible to send the diode to survival lasers so they can press it in the module?
 
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paul1598419

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I doubt it. If you need it pressed send it to me. I'll press it for you. No charge. I have the same modules DTR has and also nickel plated brass ones too. I would have to charge you for the module, but nothing for labor. I do it a lot for members here. If you like, PM me and I'll send you my address. If you buy a diode, you can have them send it to me and you will only need to pay the postage back.
 
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