Spectrographic charts

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The_LED_Museum

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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...

arcle-9.gif

This is the white LED used in the older style Arc-AAA LE (PE).
 
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NewBie

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Luxeon LXHL-BW01 spectral shift due to current dimming:
bw01cdim.png



Luxeon LXHL-BW01 spectral shift due to pwm dimming:
bw01pdim.png



60 Watt Incandescent:
incand.jpg



Two different luxeon bins:
whitel~1.jpg



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



Luxeon III QX1J #1:
qx1j_1.png



Luxeon III QX1J #3:
qx1j_3.png



The X1 bin is very large, the difference in color appearance of the above two:
qx1jcomp.png



American Bright Opto BL-HX136D:
blhx136d.jpg



American Bright Opto BL-HJB36D:
blhjb36d.jpg



American Bright Opto BL-HKD36D:
blhkd36d.jpg



American Bright Opto BL-HG636D:
blhg636d.jpg



American Bright Opto BL-HA136D:
blha136d.jpg



NEC Monitor:
monitor.jpg



Tri-Band CCFL from Laptop:
tribandp.jpg



Nichia NSSW440T:
nssw440t.jpg



Vishay TLMB3106:
tlmb3106.jpg



Peak UV Flashlight:
peakuv2.jpg



CREE XL7090 Red:
7090red.jpg



CREE XL7090 Blue:
7090blue.jpg



 
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evan9162

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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.
 

PhotonWrangler

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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.
 

The_LED_Museum

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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.
 
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