Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

Buy Site Supporter Role (remove some ads) | LPF Donations

Links below open in new window

FrozenGate by Avery

470nm diode

Not to interrupt your stirring conversation on how to calibrate a spectrometer, but the "laser that does not exist" came in today.

In the following images are a red 635nm 10mw, A green 532nm (IR filtered) 5mw, and of course the blue 470nm 25mw.

img1759kp.jpg

img1758z.jpg

img1761z.jpg

img1762gq.jpg

img1766yn.jpg


And here is an image of the dot at ~10m (can't really tell much). Also, ignore the purple scatter.. that wall is tented purple.
img1757f.jpg


So there you go.. I guess it might be 455nm, but I am quite sure it is not 405nm, and I don't think it looks like 455nm.
 
Last edited:





Your camera's not going to tell us anything. To get more accurate information, use rhd's diffraction grating test or ship it to someone with a spectrometer.

Trevor
 
Ablaze said:
Total thread jack guys. :twak:

Can't you guys discuss your spectrometer calibration process in a.. spectrometer calibration thread?

(btw laser still hasn't arrived. It might not show up until tomorrow.)
Click to expand...

They're talking about calibration so you can send your diode to one of them to get it checked.

By the looks of the picture it does look a lot like 405. I'm sure you know what 405 looks like, so it could just be the pictures. Let us know the results of the diffraction grating analysis.
 
That's just a single-mode 450.

At least, that's what it looks like to me.

There are a few ways you might be able to provide us with something useful to go by:

1) Shine it through a diffraction grating. Didn't you buy one?
2) Shine it next to a regular 445 and photograph the two together.
 
The diffraction grating reading I took read 440nm, which tells me nothing more then that the laser is somewhere in the blue range, which I already knew. The margin for error on this diffraction grating is ridiculously large.

The above three colors are the only three I have available.
 
If someone else will send you a diffraction grating, I can probably send you a 445.

It will be a horrible 445 - a near zombie diode, with a worthless lens, and it will run on a 9V battery at really low power. But it will give you a dot that you can be fairly certain is between 435 and 455.

Then, if you shine it and your "470" at the same point on your diffraction grating, and then photograph the wall, we should be able to figure out what kind of diode you're looking at.

I promise you though - it's going to be a single mode 445.
 
Silvershot said:
Has a little purple in it imo
Click to expand...
Only in the last pic, and that's because it's shining on a purple-tinted wall.

The color is a very solid blue, perhaps best described as sky blue. Here is a picture of the picture from before next to the actual thing. The images I posted are undoctored and quite faithful to the color.

I have tried very hard to present the facts in an unbiased manner, but claiming that I am unable to distinguish blue from purple is ridiculous.

A 450nm it may be.. or a 470nm. Like I said originally, 450nm hasn't come out in a consumer end pointer (i.e. <5mw), so any way you cut it this is an interesting development.

Anyone have any idea why this laser requires 6v when all my other lasers only require 3v?
 

Attachments

  • IMG_1769.JPG
    IMG_1769.JPG
    145.7 KB · Views: 164
Ablaze said:
A 450nm it may be.. or a 470nm. Like I said originally, 450nm hasn't come out in a consumer end pointer (i.e. <5mw), so any way you cut it this is an interesting development.
Click to expand...

Link

To me it looks like a single mode 450.

Ablaze said:
Anyone have any idea why this laser requires 6v when all my other lasers only require 3v?
Click to expand...

Don't blu ray diodes require more voltage than normal?

Lase
 
Last edited:
Lase said:
Link

To me it looks like a single mode 450.

Don't blu ray diodes require more voltage than normal?

Lase
Click to expand...
The thread that you linked to is a 50mw 450 with a misnamed title.. which incidentally wasn't available 3 months ago.

Blue-rays are purple. This laser is not purple. Therefor, this does not contain a blue-ray diode.
 
Ablaze said:
The thread that you linked to is a 50mw 450 with a misnamed title.. which incidentally wasn't available 3 months ago.

Blue-rays are purple. This laser is not purple. Therefor, this does not contain a blue-ray diode.
Click to expand...

Blu rays are the only diode I personally know of that use a higher voltage.

I linked to that page because when you posted yesterday you said that 450 diodes weren't commercially available. They are.

To me that diode you received looks like it's a single mode 450. NOT 470 (which would be a paler blue, almost teal)

Lase

EDIT: You posted today not yesterday
Ablaze said:
A 450nm it may be.. or a 470nm. Like I said originally, 450nm hasn't come out in a consumer end pointer (i.e. <5mw), so any way you cut it this is an interesting development.
Click to expand...
 
Last edited:
Labeled 5mW, rated 50mW, actual 43mW. Note the asterisk in the title.

IR diodes are ~2V, Red diodes are ~3V, Blue diodes are ~4V, Violet diodes are ~5.5V. In order to power a blue diode from 3V, you need a more expensive boost driver. Your supplier opted for a cheaper linear driver that requires a different input voltage.
 
No Offense but have you seen 473nm before.?

Or Even 445nm before in person not from Pictures.?

470nm would be closer to 473nm then to 445nm then 450nm nd this looks like 445nm/450nm to me. Single Mode.

If you have then the only way to really tell is send it to someone with a Spectrometer Like Cyparagon.

It wont Hurt. I will even cover shipping.

Cyparagon is usually the main guy or one of the main guys on the forum to test.

What do you say.?
 
Last edited:
lazeerer said:
No Offense but have you seen 473nm before.?

Or Even 445nm before in person not from Pictures.?

470nm would be closer to 473nm then to 445nm then 450nm nd this looks like 445nm/450nm to me. Single Mode.

If you have then the only way to really tell is send it to someone with a Spectrometer Like Cyparagon.

It wont Hurt. I will even cover shipping.

Cyparagon is usually the main guy or one of the main guys on the forum to test.

What do you say.?
Click to expand...

DITTO

IMO this thread is done until #1 its sent to someone like cyparagon or quemfox

#2 he decides by the huge difference obvious in videos and pictures betwwen 445 and 473 or 450 and 470 still a big difference
 
Just a suggestion. Would it help if someone posted a pic of 405, 445 and 473 next to each other to show the difference in colour in one pic?
 
You must log in or register to reply here.


Back
Top