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Old 06-20-2017, 05:35 AM #1
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Default The color of 410-440nm range

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 ?


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Old 06-20-2017, 05:59 AM #2
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Default Re: The color of 410-440nm range

Im sure you've seen this link Dr. Laser, the colors are pretty much 100% accurate. It looks like their may be a slight color difference

https://academo.org/demos/wavelength...-relationship/

-Alex
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Old 06-20-2017, 06:06 AM #3
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Default Re: The color of 410-440nm range

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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Old 06-20-2017, 06:39 AM #4
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by Hap View Post
Im sure you've seen this link Dr. Laser, the colors are pretty much 100% accurate. It looks like their may be a slight color difference

https://academo.org/demos/wavelength...-relationship/

-Alex
I have seen but it seems off in the violet range.
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Old 06-20-2017, 11:45 AM #5
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by Dr.Laser View Post
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 ?
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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Old 06-21-2017, 12:51 AM #6
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Default Re: The color of 410-440nm range

Most higher powered violet laser diodes are actually in the 410-415nm range, and up to around 420nm if driven very highly.
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Old 06-21-2017, 06:45 AM #7
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by steve001 View Post
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
405 seems much closer to the former if you ask me, although my eyes do have a hard time with it.

Quote:
Originally Posted by Cyparagon View Post
Most higher powered violet laser diodes are actually in the 410-415nm range, and up to around 420nm if driven very highly.
TIL... Has anyone here ever actually bothered to spectro a 405 being pushed to its limits?
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Old 06-21-2017, 06:51 AM #8
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Default Re: The color of 410-440nm range

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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Old 06-21-2017, 07:02 AM #9
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by paul1598419 View Post
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.
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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Old 06-21-2017, 11:41 AM #10
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by diachi View Post
405 seems much closer to the former if you ask me, although my eyes do have a hard time with it.


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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Old 06-21-2017, 04:48 PM #11
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by Hap View Post
Im sure you've seen this link Dr. Laser, the colors are pretty much 100% accurate. It looks like their may be a slight color difference

https://academo.org/demos/wavelength...-relationship/

-Alex
Whoa Hap!!! That's cool, I saved this to my internet favorites so I'll always have it
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Old 06-21-2017, 10:04 PM #12
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by diachi View Post
TIL... Has anyone here ever actually bothered to spectro a 405 being pushed to its limits?
Yes, I did many years ago. I had to dig around, but here's the link.

PHR-805 graphs
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Old 06-22-2017, 02:29 PM #13
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Default Re: The color of 410-440nm range

Quote:
Originally Posted by Cyparagon View Post
Yes, I did many years ago. I had to dig around, but here's the link.

PHR-805 graphs

Cool, thanks for digging those up! I wonder how the newer 405nm diodes compare, such as the BDR-209.
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Old 06-22-2017, 09:53 PM #14
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Default Re: The color of 410-440nm range

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Originally Posted by Cyparagon View Post
Yes, I did many years ago. I had to dig around, but here's the link.

PHR-805 graphs
Interesting. Is it true that the only difference between 405nm and 420nm is visibility per mW ?
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Old 06-22-2017, 10:39 PM #15
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Default Re: The color of 410-440nm range

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Originally Posted by Dr.Laser View Post
Interesting. Is it true that the only difference between 405nm and 420nm is visibility per mW ?
Pretty much. The other non significant difference is a photon at 405nm has more energy than a photon of longer wavelength.
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Old 06-24-2017, 12:40 PM #16
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Default Re: The color of 410-440nm range

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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