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Old 11-29-2016, 12:31 AM #17
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Default Re: laser crystals bonded with q-switch

Thank you very much Steve. You are right it really doesn't lase in this configuration.

I'll try add an OC close to the Q-switched end and see if there is any..


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Old 01-09-2017, 03:07 PM #18
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Arrow Re: laser crystals bonded with q-switch

I did some more work since last post. I made a cavity capable of 4 flash lamps and the rod, plated gold for reflection. The flash lamp used has a diameter of 4mm and length of 44mm. It is with quartz tube. For now each lamp is powered by 600uF capacitors (2 X 1200 uF /360V in series) charged with 540V. All four lamps share the same trigger wire. The lamps are individually wired, so I can connect 1 to 4 in experiment.

I just assembled it today. Triggers was done without focus lens in the picture - direct beam from the rod. The rod used has initial T = 50% of the absorber. I used a roll of black insulating tape in the starting tests. When 2 to 3 flash lamps were lit, there left burn patterns on the taps as the last picture. There were eight dots in the outer circle, four strong and four weak. And 4 weak dots in the inner circle. Mode 14?

I wanted to build a laser range finder with it so I'd like to have mode 00...

laser crystals bonded with q-switch-lpss1.jpg
laser crystals bonded with q-switch-lpss2.jpg
laser crystals bonded with q-switch-lpss3.jpg
laser crystals bonded with q-switch-lpss4.jpg
laser crystals bonded with q-switch-lpss5.jpg
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Old 01-09-2017, 04:08 PM #19
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Default Re: laser crystals bonded with q-switch

I hope you have the flash lamps in series, as you cannot operate arcs in parallel. I'm not sure 540V is enough to get all 4 tubes to light either. Your mode problem may be a pump distribution problem (might go away with all 4 firing) or a mirror alignment problem.
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Old 01-10-2017, 04:45 AM #20
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Default Re: laser crystals bonded with q-switch

Cyp is right. You'll want the lamps in series, although with the size you have 1-2 lamps is more than enough if they're Xenon. Cooling and timing are more of your issue here. the flash needs to be strong and probably less than about 50ns to get a good output. My ruby laser (granted it's less efficient than a yag) uses a custom 2x40uF 2800V capacitor, and 2 3" lamps in series to flash pump a 3" rod. Though a ruby has a much longer pulse lifetime, as its florescence lifetime is about 3ms-much longer than that of Nd3+ doped YAG which is on the order of 245us. anything longer than the florescence lifetime is just wasted light in theory and excess heat (but not totally sure how the passive Q-switch would affect this, probably not much). flashing too frequently with only air/convection cooling will crack the lamps or the rod potentially, or even catastrophic shattering of them in an extreme case. good news is YAG dissipates heat much better than ruby does.

As for addressing your mode issue, that's cavity engineering, and a whole separate ball of wax. Almost every flash pumped laser is built for power generally speaking and is multimode due to the gain being so high, and use a planar-planar cavity, which is inevitably going to give you multimode. You could reduce the mode using a concave mirror to make it long radius, but if you recirculate too much power you'll blow coatings off your optical surfaces very fast, sometimes even a single shot will do it if enough power is present. Rangefinders don't have to be TEM00 anyway. To avoid damaging optics, my ruby actually doesn't even have mirrors, and instead has a clever design that lets it recirculate power with other means via a prism and a specially made resonant optic that works similar to an etalon, leaving no surfaces that can be damaged and thus no performance loss.
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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
476.5nm: Argon Ion Line

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

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

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561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
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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
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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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Last edited by ultimatekaiser; 01-11-2017 at 07:25 AM. Reason: Corrected some info
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Old 01-10-2017, 07:08 AM #21
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Default Re: laser crystals bonded with q-switch

Got ruby rod rangefinder, finally.... well, at least part of one:



Would be easier and less expensive to just buy one of those solid state diode ones you can find online. What do you want to do with yours?
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Old 01-10-2017, 07:16 AM #22
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Default Re: laser crystals bonded with q-switch

Oh so you're the one who bought that! Those are cute little things.
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476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
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496.5nm: Argon Ion Line
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520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
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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

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Old 01-10-2017, 07:21 AM #23
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Default Re: laser crystals bonded with q-switch

Small, but capable of over 1 megwatt peak power. I paid too much, I thought. Then I saw another one sell for nearly three times the price I paid. What do you think an average price for these are today?
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Old 01-10-2017, 07:31 AM #24
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Default Re: laser crystals bonded with q-switch

Yeah cuz it was new. And usually a few hundred but depends on condition. Technically they're worth as much as a nice car. Mine was 40K in the 70s. So going on a quarter mil in today's money ish?

Mine did about 200mJ in 35ns. But I need to finish realigning it. I may want to borrow yours for OC reflection testing. About 6MW
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325nm: Omni 2056-M-A01 HeCd
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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
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, 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: CNI MGL-F-3W, 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 561-20
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; 01-10-2017 at 08:15 AM.
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Old 01-10-2017, 07:36 AM #25
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Default Re: laser crystals bonded with q-switch

According to what I have seen on the net so far, the most these do is about 1.4 MW peak power. Your beacon produces more than 4X that, if that is the one you are referring to.

Can I hope mine will still be properly aligned sitting in a box for decades?

What is so costly to warrant that kind of money, sheer engineering? Engineering is not cheap, especially for leading edge equipment. I think I just answered my own question...
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To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
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Old 01-10-2017, 08:13 AM #26
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Default Re: laser crystals bonded with q-switch

Quote:
Originally Posted by Alaskan View Post
According to what I have seen on the net so far, the most these do is about 1.4 MW peak power. Your beacon produces more than 4X that, if that is the one you are referring to.

Can I hope mine will still be properly aligned sitting in a box for decades?

What is so costly to warrant that kind of money, sheer engineering? Engineering is not cheap, especially for leading edge equipment. I think I just answered my own question...
kinda. Part of it was that lasers were still fairly new, especially these. They were made by Hughes for the M-60 tank IIRC, before moving to YAGs. The cost is lower for these than for mine. Mine was never a major production item-only a couple were ever made in this configuration, (mine is a portable ruby and self contained) and thus its price is higher due to fabrication costs. The rods are a few thousand dollars alone. lamps are 500-1000 each, plus the prism HR and resonant OCs in these high reliability setups are also quite expensive. not counting the old mechanical Q-switch and stuff. It adds up pretty fast. And that's not getting into power components. Silicon was still new at the time- even simple op amps were 20-30 bucks each in 60's 70's money...basically several hundred dollars. now you can buy them for cents to maybe a couple dollars depending. The motor that drives that Q switch is $$$$ money, held to a very high standard of both reliability and speed consistancy. The list goes on and on...and that's all in today's money, not back then...

Things in general back then were built more rigidly, partly due to desire for quality, partly due to just having no alternative, and when its done on a grant where money isn't really an object....well....welcome to the laser industry, where to this day, things still cost way more than what the actually cost to make, cuz people will pay it.
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457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473
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483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

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

532nm: CNI MGL-F-3W, 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 561-20
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; 01-10-2017 at 08:18 AM.
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Old 01-10-2017, 01:51 PM #27
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Default Re: laser crystals bonded with q-switch

Wish I could find some passive Q-switches for 1064nm which can handle more power than a SSY1.
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Old 01-10-2017, 04:34 PM #28
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Default Re: laser crystals bonded with q-switch

Anything more powerful than that probably needs an active one. Passive ones work through absobtion, and even an ssy1 has pretty good power. Anything more would probably damage the optic.
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325nm: Omni 2056-M-A01 HeCd
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
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, 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: CNI MGL-F-3W, 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 561-20
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; 01-10-2017 at 04:35 PM.
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Old 01-10-2017, 04:39 PM #29
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Default Re: laser crystals bonded with q-switch

No wonder I can't find them. Tks.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 01-11-2017, 04:54 AM #30
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Default Re: laser crystals bonded with q-switch

Did more tests on the four lamps config. I didn't change the lamps into series yet. This will take more time to change the circuit. However all lamps are triggered by the same HV wire. I guess they aren't going to have much difference in flashing time?

Changes were:
1. Lowered the lamp volt to 300V, and increase the cap to 1200uF
2. Replace the rod with initial T=60% one (the T=50% one has gone to heaven when I dropped it on the ground...)

The test config is like that: using a PIN diode to measure the scattered light.
laser crystals bonded with q-switch-img_3212a.jpg
Wave form of long term:
laser crystals bonded with q-switch-img_3210a.jpg
Single pulse:
laser crystals bonded with q-switch-img_3209a.jpg
Light pattern:
laser crystals bonded with q-switch-img_3199a.jpg

The fluorescent life of ND:YAG is 230uS. We got 2 pulses during one flash, with pulse width about 20ns. The power is unknown yet since I don't have a power meter on hand for now.

Next step i will reduce it to two lamps symmetric and see if can take a picture on the light pattern with a CCD camera...

to Alaskan:

There are these crystals COTS for sale in my area. I am not sure if it is more or less powerful than SSY1. Size is 8X8X4 and 8X8X5mm with initial T = 10%-14%.

laser crystals bonded with q-switch-qsw1.jpg
laser crystals bonded with q-switch-qsw2a.jpg
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Old 01-11-2017, 06:15 AM #31
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Default Re: laser crystals bonded with q-switch

Googling I am not finding anything to know what those COTS are yet, some kind of Q switch? How much, what wavelength?
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 01-11-2017, 07:25 AM #32
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Default Re: laser crystals bonded with q-switch

oh It is CR4+:YAG, about $35 each...V:YAG is cheaper

Also there is EO Q-sw for about $400...

And I am quoting for a microchip laser cavity which is 1.5mm Nd:Yag bonded with 0.5mm Cr:Yag and double side coated with mirrors. Price about $400/pc at quantity of 10.

I modified the volt back to 530V and caps to be 600uF again (because 300V/1200uF/2 lamps it didn't lase). There are two pulses per fire. and The second seems to be not as good.

All pulses
laser crystals bonded with q-switch-2lamps3a.jpg
First pulse
laser crystals bonded with q-switch-2lamps1a.jpg
Second pulse
laser crystals bonded with q-switch-2lamps2a.jpg

Last edited by op37; 01-11-2017 at 07:27 AM.
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