Old 08-02-2014, 07:25 AM #1
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Default 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'.

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Old 08-13-2014, 01:10 AM #2
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Default 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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Old 08-13-2014, 07:04 AM #3
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Default Re: WTB: Flash tube coil and capacitor @50 jouless

Assuming 600V, 50 / 360,000 * 2 = 277F
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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Old 08-19-2014, 03:11 PM #4
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Default Re: WTB: Flash tube coil and capacitor @50 jouless

Thanks, is 10 mH about right for the inductor?
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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 08-19-2014, 10:34 PM #5
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Default 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
wire around a wooden dowel. Start with maybe 10
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.
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Old 08-20-2014, 04:48 AM #6
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Default 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.
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