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



Laser Pointer Store

Wavelength-Shift, a non-scientific way :)

DJNY

New member
Joined
Nov 2, 2009
Messages
5,995
Likes
415
Points
0
It is the same laser model Cyparagon tested here
His was 511nm, so I expect mine to be anywhere around this value at room temperature.

I cooled it in the freezer for about 2 minutes and used a hairdryer to heat it up during the vid.


The most interesting part is from minute 0:15 - 0:40
small size vid, better turn off the sound


In case you can´t or don´t want to watch the vid, these pictures were taken during the vid in video-mode:
Picture taken at the beginning / cooled down
Picture taken at the end / heaten up
 
Last edited:

Hap

Super Moderator
Staff member
Joined
Sep 5, 2013
Messages
8,443
Likes
1,584
Points
113
Re: Demonstrating wavelength-shift // non-scientific way :)

Kewl, thanks for sharing this with us DJNY. The second picture you took @1:38 looks almost like 532nm to me ;)

-Alex
 

crazyspaz

New member
Joined
Jul 4, 2012
Messages
2,863
Likes
219
Points
0
Cool...didn't expect THAT much of a noticeable difference! One thing you could also do is set the laser up on a tripod, and set a diffraction grating up in front of it- then put the camera in a fixed position and record the change on the wall. The dot should move as the wavelength increases, as well as the obvious color difference.
 

bdgreenb

Active member
Joined
Jul 20, 2011
Messages
718
Likes
72
Points
28
Awesome! Gonna try that with mine today. How do you feel about the host? I personally like the feel of it, iirc cyp did not feel the same way.
 

DJNY

New member
Joined
Nov 2, 2009
Messages
5,995
Likes
415
Points
0
Cool...didn't expect THAT much of a noticeable difference! One thing you could also do is set the laser up on a tripod, and set a diffraction grating up in front of it- then put the camera in a fixed position and record the change on the wall. The dot should move as the wavelength increases, as well as the obvious color difference.
It´s a bit more of a difference than I recongnize with my naked eye. Others might see more / less color changing.
It´s fun with the diffracting grating! Tried in the past. Maybe I will add such a vid with same setup later on.

Awesome! Gonna try that with mine today. How do you feel about the host? I personally like the feel of it, iirc cyp did not feel the same way.
I like the host a lot! IMO great laser, wavelength and host :)
 

ZRaffleticket

Well-known member
Joined
Feb 4, 2010
Messages
2,961
Likes
555
Points
113
Man, I had no idea these diodes shifted so much-- holy crap. Maybe we should bug cy and see if he can spectro his in a similar test
 

hwang21

New member
Joined
Mar 27, 2013
Messages
2,351
Likes
96
Points
0
Yea I definitely need to get one of these sometime in the near future... :beer:
 

trencheel303

Well-known member
Joined
Dec 10, 2013
Messages
1,414
Likes
267
Points
83
Aye, that's a very noticeable shift. You can really notice it if you hover the mouse over the transport bar on the video and move it left to right. It goes from cyan to green.
 

DJNY

New member
Joined
Nov 2, 2009
Messages
5,995
Likes
415
Points
0
Fantastic! Now I want to buy one of those :p
I´m sure it´s also visible with your 520nm and 638nm!
Except of the beginning, the wavelength shift it´s more like an fluent passage.
So better taking a vid and as trencheel303 suggested moving back and forth for better noticing the shift.
 
Last edited:

Atomicrox

Well-known member
Joined
Jun 22, 2011
Messages
2,431
Likes
321
Points
83
Thing is.. I like those too much to risk them :p
I could try with the 635nm pen, though. Actually, I'm gonna do that right now.

Edit: works, or at least seems to work, looks more orange when cooled. Pretty nice, will try to setup with a grating to make sure it's shifting and maybe get a video.
 
Last edited:

Atomicrox

Well-known member
Joined
Jun 22, 2011
Messages
2,431
Likes
321
Points
83
Had forgotten to post back here, better now than never.

I tried to record it with a grating - if there's a shift it's tiny. What I perceived earlier might have been placebo. My camera also sees no color variation - but it sucks and I doubt it'd pick it up even if it had worked.
 

ZRaffleticket

Well-known member
Joined
Feb 4, 2010
Messages
2,961
Likes
555
Points
113
Might just be green diodes.

Got nothing to do today... gonna try it on the 462nm I have. Will report back--
 

Atomicrox

Well-known member
Joined
Jun 22, 2011
Messages
2,431
Likes
321
Points
83
I wouldn't do it at that power level, condensation might kill the diode.
The dot of my pen was significantly "blurred" from the condensation (but returned to normal about half an hour later).

Let us know if you try it!
 

ZRaffleticket

Well-known member
Joined
Feb 4, 2010
Messages
2,961
Likes
555
Points
113
I had already started the test before that. I noticed some blurring on the spot, however not much. Not much moisture should be where the electronics are as I've never taken the lens off of the module, and the only time the driver was exposed is when I hooked it up, I'm pretty sure in terms of moisture it should be fine.

As for the test... ooh boy does that make a huge difference.

I've also been running this for nearly 10 minutes now... host is just starting to reach room temp. Diode's driven at 2.4A, that's quite some time :D

--edit--

And it's as hot as I'll allow it to be now.

picture results (color difference shown in beams and below!)




Despite my camera not showing colors with 100% precision, this should sum it up. Basically, cooling made this an ordinary 445. I can't possibly say it any other way, it had the slightest hint of purple and everything. (though less than a regular 445 from memory) Maybe hit 455-460nm... I'm thinking this is ~465nm at room temp, and it probably hit ~468nm when it got heated up.

It didn't quite reach the same color as 473nm, I was able to tell the difference somewhat easily. Though it was closer than it normally got when I overheated it

Wonder if we can get ARG cyparagon or RHD to get quantitative tests...

______

Maybe it's the materials the diode is made out of, I'm fairly sure that this diode is made of the same stuff as the 520's
 

Attachments

Last edited:




Top