Old 02-12-2015, 05:24 AM #1
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Question Bausch + Lomb 39676 Ruled Diffraction Grating

Does anyone have an idea of what the line
count is on these? I think the number may
be a serial and not the actual part number.
It's mostly rubbed off and nearly
unreadable. There is also an arrow to
indicate something. Is it maybe something
to do with the blaze? Here is a link to
some pictures if it helps.

Diffraction Grating Fine Ruled Monochrometer Lab Instrument | eBay

Oh, and if you're thinking of buying any
fragile equipment from this guy, I don't
recommend it. He doesn't know how to
handle this stuff properly. The metal
cover was installed on the back like in the
pictures during shipment and it arrived
with some scratches or marring. I think
there is still enough here to work with,
though. I was not happy when I saw it.


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Old 02-12-2015, 08:19 AM #2
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

I almost bought that myself, seemed interesting.
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Old 02-12-2015, 09:13 AM #3
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

Yeah, I have never seen a ruled grating for
that cheap. He had no idea what it was
worth. It's just such a shame how it was
packaged. It was obviously perfect when he
took the pictures. It looks like it will
be alright, though. There is still plenty
of usable surface on there.
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Old 02-13-2015, 12:56 AM #4
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

You can calculate the line-count if you know the light wavelength and angle between the orders that the grating produces.
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Old 02-20-2015, 06:08 PM #5
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

If it goes in a monochromator I'd hazard a guess it's a low peroidicity echelle grating, not a ruled one. And considering I can't pull up pics on ebay....no idea. But I can say don't try to clean it. Anything touching the surface will destroy it. Gentle compressed air only. They're usually high angle, low period, medium to low lines compared to ruled ones, made for a particular small range/set of wavelengths.
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457.9nm: Argon Ion Line

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476.5nm: Argon Ion Line

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501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-100
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
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671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

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Old 02-21-2015, 02:07 AM #6
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

Quote:
Originally Posted by ultimatekaiser View Post
If it goes in a monochromator I'd hazard a guess it's a low peroidicity echelle grating, not a ruled one. And considering I can't pull up pics on ebay....no idea. But I can say don't try to clean it. Anything touching the surface will destroy it. Gentle compressed air only. They're usually high angle, low period, medium to low lines compared to ruled ones, made for a particular small range/set of wavelengths.
I thought echelle gratings had to be
ruled. If it's ruled doesn't that just
mean it was cut with a ruling engine? It
looks to be a 1350 line grating, which
seems like a common size.

Thanks for your help. This looks like it
will work nicely despite the flaws.
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Old 02-21-2015, 04:31 AM #7
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

Quote:
Originally Posted by The Lightning Stalker View Post
I thought echelle gratings had to be
ruled. If it's ruled doesn't that just
mean it was cut with a ruling engine? It
looks to be a 1350 line grating, which
seems like a common size.

Thanks for your help. This looks like it
will work nicely despite the flaws.
Echelle are ruled, but with a different geometry IIRC. sorry for being unclear. I think my old rather scratched one is 1200 lines/mm which is quite high so it probably is just a regular plane ruled grating. Most echelle gratings are less than a few hundred lines, with huge blaze angles to my knowledge and are used in high resolution spectrographs.
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405nm: Melles Griot RCS
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457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473-5
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics Cyan 488-20 DECSL, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-100
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors

Last edited by ultimatekaiser; 02-21-2015 at 04:32 AM.
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Old 02-21-2015, 04:48 AM #8
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

Quote:
Originally Posted by ultimatekaiser View Post
...high angle, low period, medium to low lines
I think you've got something backwards. Lower line-count means a smaller diffraction angle (and consequently, more beam orders)
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Old 02-21-2015, 04:53 AM #9
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

Quote:
Originally Posted by Cyparagon View Post
I think you've got something backwards. Lower line-count means a smaller diffraction angle (and consequently, more beam orders)
dunno the only Echelle I used was over 60 degrees and 300 lines/mm or something crazy like that. i'd have to look at the back of it. I'm certainly no expert. I don't really ever use it.... I prefer my 1800 line plane ruled aluminum grating for most things. I just remember it didn't make huge repeating patterns like the others I've used. but to my knowledge line count and angle are not tied together at all. the angle has to do with the way the ruling was cut. the lines/mm is...well...just that. the number of grooves in a particular space.
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375nm: Melles Griot RCS-007

405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473-5
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics Cyan 488-20 DECSL, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-100
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors

Last edited by ultimatekaiser; 02-21-2015 at 04:56 AM.
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Old 02-21-2015, 05:43 AM #10
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

Quote:
Originally Posted by ultimatekaiser View Post
I prefer my 1800 line plane ruled aluminum grating for most things. I just remember it didn't make huge repeating patterns like the others I've used.
Yeah, I noticed the repeating pattern, a
line of dots. It seems to go away and come
back depending on how the laser hits it.
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Old 02-21-2015, 04:51 PM #11
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating



Curious what you are using the grating for?
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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Old 02-21-2015, 09:46 PM #12
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

I see your cat, and raise you a Henry.



It's for a homemade spectrometer.
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Old 02-21-2015, 11:09 PM #13
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Default Re: Bausch + Lomb 39676 Ruled Diffraction Grating

Please share the project when ready to do so, now that I have a grating, I could use an example to build from.



This grating has divisions on it of some kind, why? It came out of a Flourometer. http://www.ebay.com/itm/391048944720
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Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 02-21-2015 at 11:37 PM.
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