Old 02-18-2017, 06:24 AM #1
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Exclamation Need advice on 50mW 589nm spartan issue.

I finally managed to save up and get myself a 50mW rated spartan which arrived on 2/14/17 and from the beginning noticed it dims VERY quickly. Most runs have it dimming at around 30 seconds into the run.

I am wondering whether this is completely normal for these when rated 50mW or whether I should contact Gary at DL and try to work something out.
This is a very nice wavelength but at the same time is very pricey for a unit that won't hold it's rated power for more than half it's rated duty cycle. Especially bothers me seeing most of these units tended to peak much higher than rated then settle at or above the rated power for the remaining duty cycle.

Attached is a power graph.
Ambient temp for this was 65F laser temp was 75F. Battery is an IMR unprotected cell fresh off the charger. Temperature was measured with an IR thermometer.



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Old 02-18-2017, 07:19 AM #2
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Default Re: Need advice on 50mW 589nm spartan issue.

It can't hurt to send a polite email to customer service. Just ask them nicely if what you're experiencing is expected.
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Old 02-18-2017, 07:31 AM #3
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Default Re: Need advice on 50mW 589nm spartan issue.

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Originally Posted by HydroSean View Post
It can't hurt to send a polite email to customer service. Just ask them nicely if what you're experiencing is expected.
Email sent. I knew going into this that they were unstable but did kind of expect it to stay at or near it's rated output for it's rated duty cycle. Now just to wait on the reply.
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Old 02-18-2017, 07:36 AM #4
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Default Re: Need advice on 50mW 589nm spartan issue.

might be a minor alignment issue. is it mode hopping? Mine I can run for a fair bit of time, but their quoted duty cycle by CNI is 45sec las I was told.
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Old 02-18-2017, 07:39 AM #5
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Default Re: Need advice on 50mW 589nm spartan issue.

Quote:
Originally Posted by ultimatekaiser View Post
might be a minor alignment issue. is it mode hopping? Mine I can run for a fair bit of time, but their quoted duty cycle by CNI is 45sec las I was told. average running diode temp, and thus case temp in the case of these lasers, is typically 20-25C. does sound like it needs some attention.
Does not appear to be mode hopping however I would need to grab a lens to expand it to see. I did bring up a potential misalignment caused in shipping in the email I sent them. Give me just a few minutes and I can set up to see if it is mode hopping.
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Old 02-18-2017, 07:45 AM #6
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Default Re: Need advice on 50mW 589nm spartan issue.

sure, another thing you might check is the current draw and make sure that it is stable, not likely, but could be an electrical issue.
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Old 02-18-2017, 07:53 AM #7
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Default Re: Need advice on 50mW 589nm spartan issue.

Quote:
Originally Posted by ultimatekaiser View Post
might be a minor alignment issue. is it mode hopping? Mine I can run for a fair bit of time, but their quoted duty cycle by CNI is 45sec las I was told.
Quote:
Originally Posted by ultimatekaiser View Post
sure, another thing you might check is the current draw and make sure that it is stable, not likely, but could be an electrical issue.

Mode hopping like crazy. Pretty much stays TEM01 and even glimpsed TEM02 for a moment. Only snaps into TEM00 momentarily then back to TEM01

Current draw starts at 1.730 amps for a few seconds then drops to 1.723 and holds steady there so nothing really unusual there.

Let me see if I can get some video of these modes. Seems to be a LOT more going on that simple TEM 01/Tem 00 hopping.
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Old 02-18-2017, 08:24 AM #8
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Default Re: Need advice on 50mW 589nm spartan issue.

yeah, sounds like a minor alignment issue. the KTP may have been jostled a bit in shipping, or the alignment temperature was warmer/colder than when you ran it. try lightly chilling it and running again. It may improve.
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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
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561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-100
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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
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Old 02-18-2017, 08:28 AM #9
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Default Re: Need advice on 50mW 589nm spartan issue.

Quote:
Originally Posted by ultimatekaiser View Post
yeah, sounds like a minor alignment issue. the KTP may have been jostled a bit in shipping, or the alignment temperature was warmer/colder than when you ran it. try lightly chilling it and running again. It may improve.
About to work on uploading the videos. Also about to stick the laser in the fridge @38F for a few while these upload to see if it changes.

Pretty cold in my house though at 63F right now as that is how I prefer it.
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Old 02-18-2017, 08:36 AM #10
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Default Re: Need advice on 50mW 589nm spartan issue.

yeah, these lasers do like it chilled, but some prefer it warm too. might try doing several short runs and see how it copes. but it does sound like a minor alignment issue to me just going off the raw info i'm being given.
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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
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Old 02-18-2017, 08:48 AM #11
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Default Re: Need advice on 50mW 589nm spartan issue.







Comparison shot with LG-Aries through exact same lens moments after these videos were taken.

Added a chilled video as-well. Saw a complete mainline shift to that 583 line during it as it warmed back up which was neat.

I promise that was a very squeaky floorboard @ 00:31
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Last edited by CynicalBrad; 02-18-2017 at 09:04 AM. Reason: Added a chilled video.
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Old 02-18-2017, 09:12 AM #12
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Default Re: Need advice on 50mW 589nm spartan issue.

That has got to be one of the weirder things I've seen with a laser. Very interesting, looks like the wave equation is moving between eigenstates. Idk how that would happen for a semiconductor diode though....hmm
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Old 02-18-2017, 09:13 AM #13
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Default Re: Need advice on 50mW 589nm spartan issue.

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Originally Posted by HydroSean View Post
That has got to be one of the weirder things I've seen with a laser. Very interesting, looks like the wave equation is moving between eigenstates. Idk how that would happen for a semiconductor diode though....hmm
You lost me..

EDIT:Just did some googling. I can see the resemblance.
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Old 02-18-2017, 09:21 AM #14
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Default Re: Need advice on 50mW 589nm spartan issue.

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Originally Posted by CynicalBrad View Post
You lost me..

EDIT:Just did some googling. I can see the resemblance.
Yeah check out this page for the energy of a "particle in a box" much like the multi-quantum wells used in semiconductor lasers.
https://en.wikipedia.org/wiki/Schr%C3%B6dinger_equation

Particularly this image


The eigenstates are each discrete energy level, not each degenerate energy level, but the ones with different wave equations.

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Old 02-18-2017, 09:23 AM #15
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Default Re: Need advice on 50mW 589nm spartan issue.

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Originally Posted by HydroSean View Post
Yeah check out this page for the energy of a "particle in a box" much like the multi-quantum wells used in semiconductor lasers.
https://en.wikipedia.org/wiki/Schr%C3%B6dinger_equation

Particularly this image
That is one of the image I found in my brief search.

UltimateKaiser: I'm warming the laser up now to see what happens to it as far as power output and this crazy mode hopping.
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Old 02-18-2017, 09:25 AM #16
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Default Re: Need advice on 50mW 589nm spartan issue.

Quote:
Originally Posted by CynicalBrad View Post
That is one of the image I found in my brief search.

UltimateKaiser: I'm warming the laser up now to see what happens to it as far as power output and this crazy mode hopping.
I'm hypothesizing that this "mode hopping" (which I need to read more up on) is basically the population inversion electrons switching between eigenstates.

Last edited by HydroSean; 02-18-2017 at 09:26 AM.
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