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08-02-2014, 07:25 AM #1
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,204 Rep Power: 1081900
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WTB: Flash tube coil and capacitor @50 jouless

Looking for a coil and capacitor suitable to flash at 50 joules for a 110mm long 5mm diameter flash tube in a ND:YAG laser head.

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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

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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

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08-13-2014, 01:10 AM #2
 Class 4 Laser Join Date: Sep 2013 Location: Washington State Posts: 8,363 Rep Power: 1084039
paul1598419
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Re: WTB: Flash tube coil and capacitor @50 jouless

I don't actually know where you can get these, but I was so intrigued by the concept that I wanted to give you a thumbs up. I have thought of doing the same thing with a corundum crystal doped with chromium. The famous old ruby rod laser. I have come across parts from time to time, but never enough to get me to pull the trigger. Kudos to you.
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08-13-2014, 07:04 AM #3
 Class 3B Laser Join Date: Aug 2013 Location: MI, US Posts: 2,655 Rep Power: 6069
The Lightning Stalker
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Re: WTB: Flash tube coil and capacitor @50 jouless

Assuming 600V, 50 / 360,000 * 2 = 277µF
You might want to try series/paralleling a few film caps.
Or hmm, maybe one of these?
The coil is probably best to do yourself. Wrap some
house wiring or motor wire around a wood dowel, but
not too much. Getting it right requires some
experimentation.

Do you need a trigger coil? Pulsed lasers can have
incredibly high peak powers. Be careful out there.
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08-19-2014, 03:11 PM #4
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,204 Rep Power: 1081900
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Re: WTB: Flash tube coil and capacitor @50 jouless

Thanks, is 10 mH about right for the inductor?
__________________

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

08-19-2014, 10:34 PM #5
 Class 3B Laser Join Date: Aug 2013 Location: MI, US Posts: 2,655 Rep Power: 6069
The Lightning Stalker
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Re: WTB: Flash tube coil and capacitor @50 jouless

Unless you know the exact properties of your tube,
it has to be found experimentally. Wind a coil of
turns. Then add or remove turns as needed until
you can achieve critical damping. Google 'critical
damping'. I am by no means an expert on the
subject.
__________________
ALL NEW MEMBERS MUST READ THIS!!! --> http://www.laserpointersafety.com

"Where, now, is the way by which the light distributes itself" - Job 38:24

08-20-2014, 04:48 AM #6
 Class 4 Laser Join Date: Sep 2013 Location: Washington State Posts: 8,363 Rep Power: 1084039
paul1598419
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Re: WTB: Flash tube coil and capacitor @50 jouless

Laser Project, just out of curiosity, what kind of flash tube are you using? For a Nd doped YAG rod a Krypton tube spectrum more closely matches that type crystal. If you are using Xenon, the tube is cheaper, but needs to be ionized prior to flashing by causing the resistance to decrease very quickly and allowing the charge on your capacitor bank to discharge through the tube.
__________________
405nm Laser Pointer 45mW
405nm C11 700mW
405nm Laser Shack Pointer 80mW
Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
493nm 120 mW 501B
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
Ocean Optics USB2000 Spectrometer
B&W TEK BTC100 Spectrometers X3
Scientech Vector S310 with AC2500 10 Watt LPM/ Hyperion 6 Watt & 20 Watt LPM/ Radiant X4 3.7 Watt LPM

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