Hi. No optics section; posting here.
This 1.5W laser seems rated at consumption, not output. What would be a typical efficiency to guess optical power ?
Pissed with these chinese specs. Yes, 5V times 300mA is 1500mW. But no optical power stated. Even when they arrow the output lens with the figure.

----> https://www.ebay.com/itm/1pc-1500mW...=1836098935038dade93843314d2fa01d9839148e5a7a

Would it be too much to ask that power be stated as "1500mWelectrical" or "200mWoptical" instead of the "nobody-knows but buy from me" sales strategy ?

 

I couldn't find a definitive answer but it seems like 20% is a pretty good efficiency for a laser. So the output is probably ~1/5th of the input power. I don't see how you can get a more accurate estimate without using a better supplier, or doing the testing yourself.

And BTW, you'll put your eye out kid.

 

Don't be surprised if the efficiency of your blue laser is in the 10% - 15% range.
State-of-the-art blue Laser Diodes are ~30%.

 

...

And BTW, you'll put your eye out kid.

I second that.

Silly Caucasian girl likes to play with Samurai swords.
-- O-Ren Ishii

 

Hi. No optics section; posting here.
This 1.5W laser seems rated at consumption, not output. What would be a typical efficiency to guess optical power ?
Pissed with these chinese specs. Yes, 5V times 300mA is 1500mW. But no optical power stated. Even when they arrow the output lens with the figure.

----> https://www.ebay.com/itm/1pc-1500mW-Laser-Diode-Head-Module-405nm-Blue-violet-Light-5V-for-NEJE-Engraver/183609893503?hash=item2ac000a27f&enc=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&checksum=1836098935038dade93843314d2fa01d9839148e5a7a

Would it be too much to ask that power be stated as "1500mWelectrical" or "200mWoptical" instead of the "nobody-knows but buy from me" sales strategy ?

When you speak of optical power, what units are we talking about? Are we talking watts (radiant flux), or dioptres (inverse meters), a measure of focal length.

 

Don't be surprised if the efficiency of your blue laser is in the 10% - 15% range.
State-of-the-art blue Laser Diodes are ~30%.

Wayneh reminded the TS of danger to eyesight - blue & green are the most dangerous because there's more absorption and heating.

Blue at the shorter wavelength probably has more potential damage modes.