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Old 11-21-2014, 10:54 PM #1
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Default Diffraction Grating question

I don't know if this is a silly question or not, so I'll ask it anyway.

I am confused by the 13,500 line/inch diffraction gratings.
They should be 13,500 line/inch or 532 lines/mm, but from observation they appear to be 5,182 lines/inch or 204 lines/mm.
I do have 500 lines/mm and 1000 lines/mm gratings that I compared them to.

Hopefully someone can shed some light on this. (pun intended)

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Mattronium's Laser Collection (with links to build threads etc.)

Noteworthy Lasers and λ's:
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad, ~7mW Mini-SS AAA size pen.
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
503nm SB1573N91 Assembly in progress...
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
475nm: 50mW-80mW Assembly in progress...
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser & DIY laser projector

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Last edited by Mattronium; 11-21-2014 at 10:54 PM.
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Old 11-22-2014, 01:14 AM #2
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Default Re: Diffraction Grating question

Quote:
Originally Posted by Mattronium View Post
from observation they appear to be 5,182 lines/inch
Please be more specific about your observation.
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Old 11-22-2014, 01:23 AM #3
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Default Re: Diffraction Grating question

My observations were:
First, from when I was trying to measure different wavelengths and used the HeNe 632.8nm as a reference.
Second, the general observation of the order spacing compared to 500 lines/mm and 1000lines/mm.

My measurements were quite precise, but the lines/inch calculation I made might still be +/- a few percents.
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Laser Safety Information

Mattronium's Laser Collection (with links to build threads etc.)

Noteworthy Lasers and λ's:
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad, ~7mW Mini-SS AAA size pen.
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
503nm SB1573N91 Assembly in progress...
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
475nm: 50mW-80mW Assembly in progress...
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser & DIY laser projector

"Fiat Lux" - preferably laser light.

Last edited by Mattronium; 11-22-2014 at 01:25 AM.
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Old 11-23-2014, 03:18 PM #4
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Default Re: Diffraction Grating question

Oh, you're talking about these, yes?



I just checked with the three I have, and the 13500/in does have the most narrow spacing, but that's the only one that has dual axis, so I suspect they're counting the lines in each axis? It's still a bit off from your measurement, but that would account for some of the error.
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Old 11-23-2014, 04:18 PM #5
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Default Re: Diffraction Grating question

Yes, those are the types.

Hmm, I guess they might be counting both axes.
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"SAFETY FIRST, LAST AND ALWAYS" ~ Pman
Laser Safety Information

Mattronium's Laser Collection (with links to build threads etc.)

Noteworthy Lasers and λ's:
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad, ~7mW Mini-SS AAA size pen.
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
503nm SB1573N91 Assembly in progress...
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
475nm: 50mW-80mW Assembly in progress...
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser & DIY laser projector

"Fiat Lux" - preferably laser light.
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