Qiaoba Laser Module Blue Diode 450nm (Industrial Blue Laser)445nm

Seems to work great. Just a prelim test at 6 volts (minimum seems to be 2.2v to turn on) it burned my black mouse pad. I'm not a pro on this stuff but I've never had a 5mW laser able to burn things 12 inches away, but I'm happy with extra power but just be careful this is way more than a typical 5mW laser pointer, WEAR EYE PROTECTION I pointed it at something dark 30 feet away and had to peak over my glasses and it was pretty frickin' bright.

I had bad luck with blue lasers from this seller. I ordered a blue line laser and a blue dot laser. The line laser is very bright, as it should be. The dot laser in comparison is very dim. I returned the blue dot laser for a replacement, but the replacement was likewise very dim. A properly functioning dot laser should be just as bright as a line laser - the internal components are the same. I would be very pleased to purchase a properly working blue dot laser from this seller, and would order again if I thought this was just an isolated incident. But I've now been through the cycle of receiving a defective product, requesting a replacement, and being provided yet another defective product. I am concerned that they have failed to do adequate quality control on their stock, and I don't want to spend time ordering and returning again and again until I finally receive one that works properly. This is disappointing, and also somewhat confusing, as I have also ordered red and green dot and line lasers from this seller and all of them work properly. I will update if the seller offers me a solution.

Ok- First let me say I'm a novice to diode lasers- burned my fair share of DVD diodes, built numerous working drivers for the diodes, but I still have A LOT to learn about & from diode lasers! That being said- my experience w/this diode goes as such; received laser diode in good time (2 days), figured out that it has a driver built outside the metal housing, & encased in (hotglue?) & shrinktubing, has a glass lenses, will lase @ 7.5volts via wall transformer, a very COOL Blue, NOT Violet, beam! Doesn't burn at this voltage: well- it WILL burn retinas, moist, valuable, & super important unprotected eyeballs... And no, I didn't burn mine- cause I like my vision & took other enthusiasts advice to wear the correct protective eyewear! Thank you for that- cause this laser is BEAUTIFUL, but only takes one careless moment or lapse of attention & it's a permanent regret! So, be as smart as it takes to build & use these things to protect yourself and others! Ok- I wanted to burn stuff, & 7.5v's wasn't showing any substantial damage I could brag on, so I grabbed a 9volt battery, adjusted the focal length (about 7"-10") and eureka! Smoke!! Damage!! Finally my first sign of destruction-albiet it was 5x smaller than the period at the end of this sentence. Hmm- more power!?!= Bigger damage?!? Yep- more power sure did more damage; the driver was enveloped in a dirty jet-black smoke that stunk & proceeded to have me banned to the outside workbench!! The Wife was Not pleased her beautiful oil diffuser smell-good stuff was rendered ineffective instantly! Lessons learned- So- I'm sure my diode is done- housing & lenses still usable, driver is obviously toast- literally. 12volts was too much for it. So I promptly ordered another module- I am going to receive it here any minute! Now, as you can guess I'm going to pamper this thing till I educate myself on the tolerances the diode can safely withstand- like big heatsinks, proper power supply and cooling fans!! Lol! In all seriousness, this is a great small blue (445nm) burning laser that should be respected & used in a mature manner. Not a pet chasing toy to be sure- but it will be an awesome addition to my 5 color laser paragraph display! I rated it 4 stars cause it should come with at least a little more documentation- however, saying that probably just exposed my ignorance! Be smart- be safe. Yes do buy if it fits your needs. It is worth it!!!

I thought it wasn't very bright because it was very unfocused. Once I turned the lens to almost the farthest out position, the spot really narrowed and became a tiny blue sun. Works great on an old 9V battery but the diode housing starts to get warm.

Just a blue led. Case gets warm, but is not even close to even a 1 mw laser. Waste of time and money.

Not to bad, with my cheap variable power supply it seems to pull about .1 amps at 2 volts, which seems to be the minimum operating voltage.

Revised: From 1 star to 4 stars First Review: Just like one of the other reviewers indicated, I too seem to have received a dim LED, not a laser. (Maybe he returned the unit, then it was simply restocked, and the same unit was shipped to me ??) I connected the device to a lab DC supply and carefully turned up the voltage to 7.5V (current of 0.41 amps), but no lasing. Just saw a dim purple/blue output measuring ~100 microwatts. Also, there is absolutely no technical information provided with the unit or on the Amazon website product listing. You would think a short "getting started" description would be provided. Very disappointing as I was hoping to get a 5 mW blue laser. Updated Review: So, I thought I would try one more time. I exchanged the dead laser for a new replacement, which came within 2 days. Now I have a working blue laser! This time I used my lab supply in constant current mode (max voltage set to ~ 6.5 V) and very carefully turned up the current from zero, seeing first light (fluorescence, not lasing) at I = 0.12 amps & V = 1.6 volts, and with more current reached lasing threshold at I = 0.13 amps & V = 5.6 volts. With more current the laser power increased quickly to 4.7 mW at I = 0.25 amps & V = 6.3 volts. To summarize, using a power supply in constant current mode (fine control knob) with a max voltage of ~6.5 V seems to work well. So I basically control the current very carefully (the laser power is very sensitive to small changes in current) and let the voltage settle to whatever value it needs to be to support the current. See the new photos for more detail. It would be nice if some basic instructions were included!