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

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.

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.

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 get a very dim blue output beam, which my spectrometer shows is centered at 447 nm with about 20 nm FWHM bandwidth. That means it is operating sub-threshold (spontaneous emission only). I have a variety of other lasers all with <2nm bandwidth on my spectrometer, so it is clear this unit is not lasing.Note: what I got does not match some of the product photos. Online it shows a black-heatshrink-enclosed blob on the power wires, but what I received has only two wires with no such external item. Unscrewing the case, I see it does contain an internal driver board, which has a tiny adjustment trim pot on it, so the power output and current input is adjustable, but it was already set near the max and turning the trimpot just reduces the output. It turns on around 3V input, and higher voltages like 5V show progressively reduced current draw, so the power is being regulated and limited by the DC-DC switching regulator circuit on the control board, and higher input voltage does not cause brighter output. As a last resort, I put the device the freezer for awhile, and upon removal the wavelength shifted to 445 nm but it is still 20nm wide, and just as dim as before. Overall, it looks like I bought a dim blue LED.

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.

Nice stable beam.

I bought this laser diode for experimentation and it performed wonderfully well. The lens screws on the front end and can be adjusted a bit to focus the beam. The metal housing is good quality. The beam is strong and bright and very adjustable with changes to the input current and voltages. All in all a good bargain.