ArmyTek        
Page 1 of 34 1234567811 ... LastLast
Results 1 to 30 of 995

Thread: Spectrographic charts

  1. #1
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Talking Spectrographic charts

    This thread will be for spectrogtaphic charts of various LEDs and lasers.
    I have temporary custody (loan) of an Ocean Optics USB2000 spectrometer.

    Let's start off here with the first one...


    This is the white LED used in the older style Arc-AAA LE (PE).
    Last edited by The_LED_Museum; 04-10-2006 at 06:51 PM.

  2. #2
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    This is for a DPSS green laser.

  3. #3
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    This is for a stable phosphor-type pink LED.

  4. #4
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    This is for a blue DPSS laser.


    Same as above, with IR filter removed.
    Last edited by The_LED_Museum; 03-12-2006 at 02:11 PM.

  5. #5
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Red LEDs from a PowerFlare.

  6. #6
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Directly-injected red laser diode.

    I'll do the DPSS yellow laser later today.

  7. #7
    *Flashaholic* McGizmo's Avatar
    Join Date
    May 2002
    Location
    Maui
    Posts
    17,265

    Default Re: Spectrographic charts

    Let me add a couple:

    SF M1 Ir:





    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  8. #8
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrometer plot of the yellow DPSS laser I have.


    Same as above; IR filter removed.

  9. #9
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrum of a GE AR-1 argon glow light blub.

  10. #10
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrum of a 385nm UVA LED.

  11. #11
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrum of a white Luxeon Star I LED.

  12. #12
    *Retired* NewBie's Avatar
    Join Date
    Feb 2004
    Location
    Oregon- United States of America
    Posts
    4,946

    Default Re: Spectrographic charts

    Luxeon LXHL-BW01 spectral shift due to current dimming:



    Luxeon LXHL-BW01 spectral shift due to pwm dimming:



    60 Watt Incandescent:



    Two different luxeon bins:



    Toyoda-Gosei True-White-Hi long life blended Phosphor w/UV LED source:



    Luxeon III QX1J #1:



    Luxeon III QX1J #3:



    The X1 bin is very large, the difference in color appearance of the above two:



    American Bright Opto BL-HX136D:



    American Bright Opto BL-HJB36D:



    American Bright Opto BL-HKD36D:



    American Bright Opto BL-HG636D:



    American Bright Opto BL-HA136D:



    NEC Monitor:



    Tri-Band CCFL from Laptop:



    Nichia NSSW440T:



    Vishay TLMB3106:



    Peak UV Flashlight:



    CREE XL7090 Red:



    CREE XL7090 Blue:



    [img][/img]
    Last edited by NewBie; 03-15-2006 at 09:26 AM.

  13. #13
    Flashaholic*
    Join Date
    Apr 2002
    Location
    Boise, ID
    Posts
    2,639

    Default Re: Spectrographic charts

    newbie,

    nice graphs. I noticed that the batwing Lux I (BW01 - globbed phosphor batwing) you tested has the "red spike" in the spectrum, while the Lux III samples don't. Looks like maybe the phosphor is indeed different between these two generations of Luxeons.

    Craig's Lux I test has the red spike, while McGizmo's Lux III again does not. So it does indeed look like there is a phosphor difference.

  14. #14
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrum of a white Luxeon Star III LED.

  15. #15
    Flashaholic*
    Join Date
    Aug 2001
    Location
    VA
    Posts
    3,602

    Default Re: Spectrographic charts

    Sunlight anyone?
    Light is the activity of what is transparent - Aristotle

  16. #16
    Flashaholic* Quickbeam's Avatar
    Join Date
    Jun 2001
    Location
    FlashlightReviews.com
    Posts
    4,329

    Default Re: Spectrographic charts

    Sunlight? Here you go! Not as perfect a spectrum as you may think!

    Full Solar Spectrum

    OK, so it's not a true spectrographic chart, but I think it belongs here anyway...

    Enjoy!
    Doug P.
    Last edited by Quickbeam; 03-15-2006 at 07:41 PM.
    Archive of the Original FlashlightReviews.com ::::: The default position on any claim is disbelief until credible evidence is presented.

  17. #17
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrum of a white Luxeon Star V LED.

  18. #18
    *Flashaholic* PhotonWrangler's Avatar
    Join Date
    Oct 2003
    Location
    In a handbasket
    Posts
    12,741

    Default Re: Spectrographic charts

    Nice graphs, Craig!

    Have you tried varying the current (or putting in a weaker battery) on one of the red lasers and noting the results? I've found that the spectral content spreads out when it's not driven as hard, and when the current falls below lasing threshold, the spectral content looks virtually identical to a red LED. It's kind of interesting to compare the spectral width at different drive levels.

    This phenomenon matters when using a directly-modulated laser for fiber optic communications when using amplitude modulation, as the spectral width of the laser jumps around a lot from the modulation.
    Veni vidi velcro

  19. #19
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts

    Yes, you are very correct here; when the drive current to the laser diode is below threshold, the spectral line halfwidth increases DRAMATICALLY, causing the laser diode to have an emission spectrum very similar to that an LED would generate.

  20. #20
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrum of a 400nm LED.

  21. #21
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts

    Spectrometer plots of the four LEDs in an eternaLight Rave'n X2:


    Spectrum of the red LED.


    Spectrum of the yellow LED.


    Spectrum of the green LED.


    Spectrum of the blue LED.

  22. #22
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts


    Spectrum of a 3 volt incandescent light blub.

  23. #23
    *Flashaholic* IsaacHayes's Avatar
    Join Date
    Jan 2003
    Location
    Missouri
    Posts
    5,876

    Default Re: Spectrographic charts

    Cool. Do one of your Cyan "positron laser" please!! I want to find out what bin it is!

  24. #24
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts

    Your wish is my command...


    Spectrum of the cyan Luxeon V in my Positron Laser flashlight.

  25. #25
    *Flashaholic* IsaacHayes's Avatar
    Join Date
    Jan 2003
    Location
    Missouri
    Posts
    5,876

    Default Re: Spectrographic charts

    Thanks! So is that 490nm? Hard to tell exactly what it is. Do you know exactly what the peak is? The colors around those wavelengths vary a lot with just a couple of nm.

    EDIT: Unless your instrument gives the actuall peak number, what I determined from drawing a line in photoshop was 488nm!! Argon laser color exactly!!
    Last edited by IsaacHayes; 03-16-2006 at 06:48 PM.

  26. #26
    *Flashaholic* PhotonWrangler's Avatar
    Join Date
    Oct 2003
    Location
    In a handbasket
    Posts
    12,741

    Default Re: Spectrographic charts

    Quote Originally Posted by The_LED_Museum

    Spectrum of a 3 volt incandescent light blub.
    Thanks! Now that's a perfect explanation of why a filtered incandescent bulb makes such a crummy blacklight. There ain't nuthin' there!
    Veni vidi velcro

  27. #27
    *Flashaholic* IsaacHayes's Avatar
    Join Date
    Jan 2003
    Location
    Missouri
    Posts
    5,876

    Default Re: Spectrographic charts

    yeah, no wonder those things get hot! It's absorbing all the engery made by the bulb!!

  28. #28
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts

    Quote Originally Posted by IsaacHayes
    Thanks! So is that 490nm? Hard to tell exactly what it is. Do you know exactly what the peak is? The colors around those wavelengths vary a lot with just a couple of nm.

    EDIT: Unless your instrument gives the actuall peak number, what I determined from drawing a line in photoshop was 488nm!! Argon laser color exactly!!
    As far as I'm able to determine, the peak wavelength of that LED is between 491nm and 494nm.
    Let me go examine that spectrum a little more closely and see if I can pin it down with any more accuracy...BBS...
    Ok, looks like ~492nm to me.
    Visually, from what I remember, the light from the Positron Laser is *JUST A HAIR* more greenish than the 488nm argon-ion laser.

  29. #29
    *Flashaholic* IsaacHayes's Avatar
    Join Date
    Jan 2003
    Location
    Missouri
    Posts
    5,876

    Default Re: Spectrographic charts

    Cool, sounds like you nailed it then. ~2-4nm is visable probably when compared side by side. Do you find the side-spill when cast on objects like wood/skin/etc or stuff at a distance looks more green than the center hotspot? I found that once you get to 488nm it all looks "light blue" and that effect goes away.

  30. #30
    *Retired* The_LED_Museum's Avatar
    Join Date
    Aug 2000
    Location
    Federal Way WA. USA
    Posts
    19,418

    Default Re: Spectrographic charts

    I think the corona light appears to be the same color as the hotspot; but I don't have access to forested areas or dark distant areas here, so I can't take it into dark woods or dark parking lots to see how objects appear in this light to confirm these findings for you. :

Page 1 of 34 1234567811 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •