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Maybe it's just dirty lens ....

Isn't there any other way? That is definitely a way I can't (pratical/cost). I thought of something pratical, low cost.

How can I check if a flashlight has the advertised lumen power?

My tip goes to 5-in-1 200mw 532nm Open-back Star-projected Green Laser Pointer Pen (2×AAA) from Dinodirect at US$39. I have one, it's actually 180mW including 22mW of infrared(>950nm). Its beam is much brighter than 50mW. Good power, low divergence and good dot. I can reach a limestone quarry...

For those that didn't see it, MythBusters: Supposedly those who visited the moon left a reflector on the moon which can be detected by laser here on earth. Is the reflector really there? The MYTHBUSTERS find out!

I think all your answers can be found in the links below: The, "I want to build a laser", Thread INDEX (work in progress)

Parece que somos 2 aqui, contando com a sorte para receber o 1.2W do Yobresal. Tb não pedi o express por causa da alfândega. Já fiz a besteira de comprar um 400mW 532nm na O-like via express, foi pra receita (SP), saiu sem nada sobre taxação, mas tem 2 semanas q está "encaminhado" p/ BH e...

Re: 1.2 Watt Copper 445nm blue lasers $149 shipped Is there any possible risk for the driver/diode using 18650? Would just 3.6V make it work at all? I like the possibility of using the laser with half capacity sometimes.

I have one and tested it. It's just 104mW:

Most weird is : Pack including: 1 × Laser Pen 1 × Charger 1 × User Manual 2 × Battery 1 × Red Laser Head <<<<<<<< 1 × Green Laser Head <<<<<<< 5 × Laser Cap 1 × Key

Even with same numbers, there are differences in size or endings that can result your battery not suitable for the purpose:

If we consider that red lasers usually have bigger beam diameter, that ratio should be even higher. A particle suspended in air receives more light in a dense beam like green's than in red's.

What do you think about their 500mW red? True Power Guaranteed 500mW 650nm Red Laser Pointer Pen BGP-0019 (Battery included) I noticed that it's very rare to see reds over 300mW in the forum. I had asked O-Like about a red over 300mW and Susie told me they're not stable and die easily. I really...

Any beamshots? If possible, without smoke/fog.

I buy many items from Dino, and every coupon worked for me. Recently I bought 2x 100mW green keychain and got US$10 discount: Order number:27799543-DD Item(s) Qty Price Subtotal 100mw 532nm Open-back Green Laser Pointer with Keychain( igniting matches) A0878000DQ 2 pieces US$ 28.30 US$...

Yes, this is science! If you are building a new one or want to disassemble a laser, this is the way. Excuse me if I insist, but my goal, and I think it's the same for Frazman187 at the very first post of this thread, is not to design a new laser, but once you have one in your hands, how to...

Sure! No doubts! For any laser fanatic like us, it's always fun. My point is: I buy a portable laser and the seller shows in his site a duty cycle 60s/30s on/off. How can I check that, without burning my toy?

I thought the duty cycle was only dependent of the temperature inside the diode/cristal. My question is: how to know what is the max temperature a laser can operate without damage? I've seen many comments about laser too hot or not, but if we put an thermocouple just near the center of the laser...

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