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The color of 410-440nm range

Dr.Laser

Dr.Laser

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To people who have seen this range of wavelength in real life. Which wavelength in this range worth having and distinguished from both 405nm and 445nm ?
Is there a visible difference between 405nm and 420nm ?
 





paul1598419

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My money is on 430nm. it is a deeper blue than 445nm, but without the violet in all the wavelengths leading up to it. At least that is what my eyes see.
 
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steve001

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Dr.Laser said:
To people who have seen this range of wavelength in real life. Which wavelength in this range worth having and distinguished from both 405nm and 445nm ?

Is there a visible difference between 405nm and 420nm ?
Click to expand...
Without any stipulations which is worth having is absolutely subjective.

Of course there is.

I took a look at that color vs wavelength app. I'm always puzzled why wavelengths at the 405nm wavelength are presented as purplish. @@@@@@ instead of this.@@@@@@@@@@
This is a darn good representation of the color violet
 
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Cyparagon

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Most higher powered violet laser diodes are actually in the 410-415nm range, and up to around 420nm if driven very highly.
 
diachi

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steve001 said:
Without any stipulations which is worth having is absolutely subjective.

Of course there is.

I took a look at that color vs wavelength app. I'm always puzzled why wavelengths at the 405nm wavelength are presented as purplish. @@@@@@ instead of this.@@@@@@@@@@
This is a darn good representation of the color violet
Click to expand...

405 seems much closer to the former if you ask me, although my eyes do have a hard time with it.

Cyparagon said:
Most higher powered violet laser diodes are actually in the 410-415nm range, and up to around 420nm if driven very highly.
Click to expand...

TIL... Has anyone here ever actually bothered to spectro a 405 being pushed to its limits?
 
paul1598419

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I haven't, but I could. I have one that is definitely pushed that hard. I'll let you know when I have the time to do it.
 
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diachi

diachi

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paul1598419 said:
I haven't, but I could. I have one that is definitely pushed that hard. I'll let you know when I have the time to do it.
Click to expand...

Be interested in seeing the results! Not that I don't believe Cyp, it makes perfect sense, I'd just like to see the graph.
 
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steve001

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diachi said:
405 seems much closer to the former if you ask me, although my eyes do have a hard time with it.
Click to expand...
It's interesting that 405nm looks like the former color to you. Part of the reason may be the background color surrounding those two colors.
To see 405nm (violet) accurately use a large prism and let the beam from it when placed in the sun spread out widely before it hits a white surface. Or if you have a 405nm laser decollimate it on a white surface. Then let's see if it looks like the former.
 
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steve001

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Dr.Laser said:
Interesting. Is it true that the only difference between 405nm and 420nm is visibility per mW ?
Click to expand...
Pretty much. The other non significant difference is a photon at 405nm has more energy than a photon of longer wavelength.
 
Atomicrox

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I have a "445nm" which has a much lower wavelength than the other lasers of similar "faceplate" wavelength and the beam does look considerably more violet, a bit closer to the 405nm color. The dot still looks the regular royal blue color, though.
 
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