Very cheap low power 445nm

Ash · Jul 16, 2011

Stuff I have ordered from aliexpress has arrived in about a week on average.
Where do you live? There may be a member near you with an LPM.

cmendoza · Jul 16, 2011

During checkout it said 2-3weeks. Maybe they just wanted to give themselves extra time. I'm in Salt Lake City, UT.

Wolfman29 · Jul 16, 2011

I'm pretty close... I'm in Phoenix, AZ.

EDIT: And I have a semi-accurate LPM.

Fenzir · Jul 17, 2011

Cmendoza, are you planning to keep all of them if they turn out to be on or close to spec?

Ash · Jul 17, 2011

If the output power is close to the 100-300mW they state, I'll take one.

Fenzir · Jul 17, 2011

:crackup:

Ash said:
If the output power is close to the 100-300mW they state, I'll take one.

Although you do bring up a valid point, seeing as the description is different than the title, I believe we are looking for a 20mw laser.

cmendoza · Jul 18, 2011

Yobresal is going to do a full eval on one when they come. I'll probably sell one or two of the others. Fenzir and Ash can have first dibs if I sell! If these are really 445nm and up to spec, I imagine someone will organize a bigger group buy.

rhd · Jul 18, 2011

I hate to say it, but I think you'll find that these are 405s. I've seen 405s labeled as 445s all over the place

cmendoza · Jul 18, 2011

Careful, you might jinx me!

Helios · Jul 18, 2011

Its not the 445nm diode we use thats for sure unless they have corrective optics in there too. Which they dont.

Does that dot look like a multimode line to you?

Cyparagon · Jul 18, 2011

rhd said:
I hate to say it, but I think you'll find that these are 405s. I've seen 405s labeled as 445s all over the place

But the driver requires 4.5V. That's too low for a violet if it is linear - and if it were a boost driver, you'd think it would be able to handle a more common 3V supply.

rhd · Jul 18, 2011

Cyparagon:939507 said:
rhd said:

I hate to say it, but I think you'll find that these are 405s. I've seen 405s labeled as 445s all over the place

Click to expand...

But the driver requires 4.5V. That's too low for a violet if it is linear - and if it were a boost driver, you'd think it would be able to handle a more common 3V supply.

That's not too low for a violet. While we're used to seeing 6V as a common Vf for the 405s we build with here, that same wisdom isn't true across the board for 405. The really low powered 405s generally have a Vf of 4.5 or 4.8.

cmendoza · Jul 18, 2011

I like the way Cyparagon thinks!

These lasers are now listed as out of stock but they do have a listing for 30mW:
Buy blue laser pointer, laser pointer, blue laser, A 30mw 445nm blue laser pointer, a manual, a box, three batteries, hot sales at Aliexpress.com

Unfortunately they are twice as much.

Cyparagon · Jul 18, 2011

rhd said:
The really low powered 405s generally have a Vf of 4.5 or 4.8.

Add in the dropout from the regulator, and it's not possible.

Even if the regulator had no dropout, it would only be powered for 5 minutes - alkaline voltage sags rather quickly.

cmendoza · Jul 31, 2011

Lasers came today!!!

They are ......................... 405nm and take 2 AAA batteries

Not too big a surprise. I'm contacting them to see if they'll make good.

Yobresal, there's no doubt that they are 405nm. Do you still want me to send one?

Jacob32123 · Jul 31, 2011

cmendoza said:
Lasers came today!!!

They are ......................... 405nm and take 2 AAA batteries

Not too big a surprise. I'm contacting them to see if they'll make good.

Yobresal, there's no doubt that they are 405nm. Do you still want me to send one?

That sucks. I really wanted a low power 445

Very cheap low power 445nm

Ash

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