Concave lens

[Motocrossboy69]

Hi, im trying to make a laser collimator but i need a concave lens, were could i find one without having to buy one, could i use glasses?

 

[FireMyLaser]

An old video camera is a goldmine. You'll find concave/convex lenses and IR-filter(s).

Glasses? no.

 

[Motocrossboy69]

only problem ive gt is i dont have an old one and i cant buy one, because i just spent all my money on a laser!

 

[VillageIdiot]

which laser? Look, an Aixiz module costs only about $4. That includes a housing which serves as minimal heatsinking as well as a collimating lens.

If you want to focus the laser you just bought, you need a conVEX lens which can be found in a pocket magnifier (like $5 at a store)

 

[Motocrossboy69]

Classic green 15mw

 

[FireMyLaser]

Then it should be fine (except that it's a WL (lol joke). What's the problem?

 

[VillageIdiot]

Did you get that one that was posted on the B/S/T section here? That was one hell of a deal!

 

[Motocrossboy69]

im still a bit confused on how to make it and  Im not sure if can use an old pair of glasses as the concave lens, also im not what i should use to cut the lens! Thanks for all the help! no i didnt see that one ill have a look now!

 

[VillageIdiot]

So you're going to make your own laser from a burning diode? You need:

-The diode
-An Aixiz housing
-A host to keep the laser, power source and circuitry in (eg flashlight, project box)
-A driver to regulate current to the diode
-Power source (several normal batteries or a few lithium batteries in a holder)

You can build one for about $40. There are step-by-step tutorials here on exactly how to do it, such as kenom's Dorcy Junior flashlight hack.

DO NOT DO KIPKAY'S MINIMAG HACK.

 

[Cyparagon]

If you want to focus the laser you just bought, you need a concave lens which can be found in a pocket magnifier (like $5 at a store)

conVEX... or positive meniscus.. or plano-convex

 

[Motocrossboy69]

Nah im just trying to make a collmator for my 15mw! i have looked into making that before though!

 

[FireMyLaser]

Top: convex

bottom: concave

 

[Motocrossboy69]

Yeah thats what i want the bottom one.

 

[FireMyLaser]

Do you want to make a expander perhaps? The laser should already be collimated otherwise.


Binoculars work.

 

[VillageIdiot]

[quote author=VillageIdiot link=1216561623/0#3 date=1216562861]
If you want to focus the laser you just bought, you need a concave lens which can be found in a pocket magnifier (like $5 at a store)

conVEX... or positive meniscus.. or plano-convex[/quote]


God damnit, I was thinking convex! How did I type concave?

 

[FireMyLaser]

Sh*t happens.


It does.


<insert funny pic>