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Old 07-16-2011, 08:51 PM #17
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Default Re: Very cheap low power 445nm

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.


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Old 07-16-2011, 09:42 PM #18
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Default Re: Very cheap low power 445nm

During checkout it said 2-3weeks. Maybe they just wanted to give themselves extra time. I'm in Salt Lake City, UT.
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Old 07-16-2011, 10:19 PM #19
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Default Re: Very cheap low power 445nm

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

EDIT: And I have a semi-accurate LPM.

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Old 07-17-2011, 06:10 AM #20
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Default Re: Very cheap low power 445nm

Cmendoza, are you planning to keep all of them if they turn out to be on or close to spec?
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Old 07-17-2011, 06:20 AM #21
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Default Re: Very cheap low power 445nm

If the output power is close to the 100-300mW they state, I'll take one.
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Old 07-17-2011, 04:30 PM #22
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Default Re: Very cheap low power 445nm

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Originally Posted by Ash View Post
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.
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Old 07-18-2011, 04:02 PM #23
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Default Re: Very cheap low power 445nm

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.
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Old 07-18-2011, 05:17 PM #24
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Default

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
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Old 07-18-2011, 05:41 PM #25
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Default Re: Very cheap low power 445nm

Careful, you might jinx me!
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Old 07-18-2011, 06:13 PM #26
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Default Re: Very cheap low power 445nm

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?
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Old 07-18-2011, 06:48 PM #27
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Default Re: Very cheap low power 445nm

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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.
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Old 07-18-2011, 07:00 PM #28
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Default

Quote:
Originally Posted by Cyparagon:939507
Quote:
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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.
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.
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Old 07-18-2011, 07:11 PM #29
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Default Re: Very cheap low power 445nm

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.
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Old 07-18-2011, 08:39 PM #30
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Default Re: Very cheap low power 445nm

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Originally Posted by rhd View Post
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.
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Old 07-31-2011, 12:59 AM #31
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Default Re: Very cheap low power 445nm

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?
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Old 07-31-2011, 01:02 AM #32
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Default Re: Very cheap low power 445nm

Quote:
Originally Posted by cmendoza View Post
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

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