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1mW 405nm Violet Laser

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Magel282

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Feb 15, 2009
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Hi guys. Just received a cheap 1mW 405nm Laser Poiner for testing. When I turn it on and shine it at my wall the dot looks all fuzzy. But on different objects it looks like a solid dot. Is this a normal function of the 405nm's? Also I cant see the beam either. I have tried adjusting the focus lens but it still looks fuzzy at best focus point.

Edit: Just tried it outside in the dark and I can see the beam.
 





Re: Cheap 1mW 405nm Blue Laser

Magel282 said:
Hi guys. Just received a cheap 1mW 405nm Laser Poiner. When I turn it on and shine it at my wall the dot looks all fuzzy. But on different objects it looks like a solid dot. Is this a normal function of the 405nm's? Also I cant see the beam either. I have tried adjusting the focus lens but it still looks fuzzy at best focus point.

Edit: Just tried it outside in the dark and I can see the beam.
Click to expand...

Because the wavelength of blue ray lasers are close to Ultra Violet some people have more difficalty seeing the dot than others. I rememebr reading that because its so close to UV your eyes can't easily focus on the dot and beam which is why the dot will just look blury at times.

I think blue rays will be similar to other lasers on different surfaces. Eg. a green laser on a white surface will be very bright and look like it has a huge dot but if you point it at a dark surface like black the dot will look small and no where near as bright making it wasier to see.

If the laser is 1mW you wont be able to see the beam at all in bright conditions, in fact again because of the wavelength I would be supprised you can see it at night unless its foggy outside or your in a room with a lot of smoke. Even with a 1mW green laser you wont be able to see the beam in bright conditions.

Oh to add to it... Blue rays are not actually blue, they are violet, blue lasers are around 473nm and they cost a heck of a lot.

Where did you get the laser from?
 
Re: Cheap 1mW 405nm Blue Laser

you cant see uhe beam cause it's so low powered it probably needs around 50mw to see the beam :) its normal to 405nm to look fuzzy
 
Re: Cheap 1mW 405nm Blue Laser

lamborgini8 said:
[quote author=Magel282 link=1235563808/0#0 date=1235563807]Hi guys. Just received a cheap 1mW 405nm Laser Poiner. When I turn it on and shine it at my wall the dot looks all fuzzy. But on different objects it looks like a solid dot. Is this a normal function of the 405nm's? Also I cant see the beam either. I have tried adjusting the focus lens but it still looks fuzzy at best focus point.

Edit: Just tried it outside in the dark and I can see the beam.
Click to expand...

Because the wavelength of blue ray lasers are close to Ultra Violet some people have more difficalty seeing the dot than others. I rememebr reading that because its so close to UV your eyes can't easily focus on the dot and beam which is why the dot will just look blury at times.

I think blue rays will be similar to other lasers on different surfaces. Eg. a green laser on a white surface will be very bright and look like it has a huge dot but if you point it at a dark surface like black the dot will look small and no where near as bright making it wasier to see.

If the laser is 1mW you wont be able to see the beam at all in bright conditions, in fact again because of the wavelength I would be supprised you can see it at night unless its foggy outside or your in a room with a lot of smoke. Even with a 1mW green laser you wont be able to see the beam in bright conditions.

Oh to add to it... Blue rays are not actually blue, they are violet, blue lasers are around 473nm and they cost a heck of a lot.

Where did you get the laser from?[/quote]

Ok that makes sence why it looks blury then. For a cheap laser I am pretty impressed by its construction. It can be completly taken apart extremely easily. The diode is screwed into its housing and can be removed and replaced with another diode. The lens can also be adjusted. The driver also has an adjustable screw on it. I assume turning it clockwise would increase the power to it. Not sure how much it could take though.
 
Re: Cheap 1mW 405nm Blue Laser

i'd say give her a 1/10 turn and see what happens -is it a 803-t or a 5 pin ps3
 
Re: Cheap 1mW 405nm Blue Laser

I dont think its either. Heres the pic of the diode and housing -



There are 3 pins comming from the diode.
 
Re: Cheap 1mW 405nm Blue Laser

daguin said:
[quote author=john lawson link=1235563808/0#4 date=1235567144]i'd say give her a 1/10 turn and see what happens -[highlight]is it a 803-t or a 5 pin ps3[/highlight]
Click to expand...

There ARE other diodes out there ;)

Where did you get this?

You  should read this http://www.laserpointerforums.com/forums/YaBB.pl?num=1219161671

Peace,
dave[/quote]

Great post on the 405nm laser. Very insightful :). I got it from a manufacture in china. I am considering selling them and other 1mW green, red lasers here in Aus.

Also I have no idea what diode is in this or weather its emiting i/r. I wasnt awear the "blue" lasers emited i/r.

Edit: Heres my diode tester that I assembled using the guide from Deadal. Its ready for the 3 phr-803t diodes ive got coming in the post. I modified an on off switch into it.

 
Re: Cheap 1mW 405nm Blue Laser

Magel282 said:
Great post on the 405nm laser. Very insightful :). I got it from a manufacture in china. I am considering selling them and other 1mW green, red lasers here in Aus.
Also I have no idea what diode is in this or weather its emiting i/r. I wasnt awear the "blue" lasers emited i/r.
Click to expand...

"Blue" (473nm) DPSS lasers emit IR light

"Blu-ray" (violet; 405nm) diode lasers do NOT.  This is, most probably, a 405nm, diode laser.

Here is one of Rog's great pictures showing the difference between "blue" and "blu-ray (violet)
STA72876.JPG


I would very much like to check one out.  Can you give me a contact or sell me one?  I will review it here.  You can use my research in your sales.  Also, I can update the "sticky/wiki"

That reminds me. I haven't added the last update to the wiki.

Peace,
dave
 
Re: Cheap 1mW 405nm Blue Laser

My laser is definitely purple like the one on the right hand side (thanks daguin :)) so hopefully no i/r. And will be happy to sell you one once ive established some stock of these :). Ill also be able to provide the red and green ones aswel to anyone interested, only @ 1mW though due to the restictions in Aus. Ill update my sig accordinly when avalible.
 
Re: Cheap 1mW 405nm Blue Laser

Magel282 said:
My laser is definitely purple like the one on the right hand side (thanks daguin :))[highlight] so hopefully no i/r[/highlight]. And will be happy to sell you one once ive established some stock of these :). Ill also be able to provide the red and green ones aswel to anyone interested, only @ 1mW though due to the restictions in Aus. Ill update my sig accordinly when avalible.
Click to expand...


Not to worry. The 405nm diodes do NOT produce Infra-Red light. The IR light in the Blue and the Green lasers comes from an Infra-Red diode that is used to "pump" a crystal set to get the blue and/or green light. The 405nm diode does NOT have this construction.

Keep me informed about the potential to evaluate one of these. Maybe I'll see if one of my students can get a couple for me.

Peace,
dave
 
Re: Cheap 1mW 405nm Blue Laser

Ok I think your getting confused here.

Your laser is VIOLET/PURPLE, not blue. A blue ray laser does not emit blue, it emits 405nM VIOLET/PURPLE.

Blue ray = one diode on its own, emiting 405nM.
Blue = 473nM uses an IR diode and an crystal to change the colour to blue.

A blue ray has no IR diode, the light is emited straight from the diode.

Your not the first to make the mistake, Blue Ray is just a marketing name. Probally a bad example but the American airline named "Jet Blue" doesn't actually mean the planes are all painted blue.
 
Re: Cheap 1mW 405nm Blue Laser

lamborgini8 said:
Ok I think your getting confused here.

Your laser is VIOLET/PURPLE, not blue. A blue ray laser does not emit blue, it emits 405nM VIOLET/PURPLE.

Blue ray = one diode on its own, emiting 405nM.
Blue = 473nM uses an IR diode and an crystal to change the colour to blue.

A blue ray has no IR diode, the light is emited straight from the diode.

Your not the first to make the mistake, Blue Ray is just a marketing name. Probally a bad example but the American airline named "Jet Blue" doesn't actually mean the planes are all painted blue.
Click to expand...

Yea I understand my mistake now after reading daguin's thread on blue and violet lasers. Thanks for your imput aswel :). This laser really illuminates certain white objects. Shone on some objects it lights up the whole room 8-). I love eye candy!.
 
Re: Cheap 1mW 405nm Blue Laser

I highly suspect this "1mW" laser is an order of magnitude and then some more powerful than claimed.

I find that you don't get the fuzzy effect unless you are at least 10 or so mW and a visible beam suggests 50mW+.

All the better!
 
Re: Cheap 1mW 405nm Blue Laser

691175002 said:
I highly suspect this "1mW" laser is an order of magnitude and then some more powerful than claimed.

I find that you don't get the fuzzy effect unless you are at least 10 or so mW and a visible beam suggests 50mW+.

All the better!
Click to expand...

Hmm doubt it would be anything close to 50mW. The beam is only just visible in pitch black and I have to be staring down along the laser pointer to see it. Id like other opinions on this if possible from their experiance with the violet lasers. Is there a way to test the amps output with a multimeter. I have a small meter but it doesnt register anything no matter what its hooked upto when measuring amps. Think its to crappy.

Will post some pics of the laser shortly :).
 
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