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Wow, that's a pretty impressive "quick" calculation, and a lot of needed energy! :yh:
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Wow, that's a pretty impressive "quick" calculation, and a lot of needed energy! :yh:
ughhh...now I'm just procrastinating...
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A quick calculation shows that to reach total inversion in the rod, (doped 0.05% by mass Cr3+ and pumping with 400nm at 100% efficiency) you need 3854W of INPUT for every cubic centimeter of ruby rod. You need to be at half that to reach the threshold of lasing, but once it starts lasing you need to pump in even more energy to make up for that lost by the crystal.
So...you probably won't be doing that with LEDs.There's a reason those lamps for pumping ruby rods are operating in the megawatts when firing!!
Thanks for all the input.
Looks like I will keep looking around for a Flashlamp or 2 that would be usfull to pump it.
Not too hard to find: https://www.ebay.com/usr/phase-space-optics?_trksid=p2047675.l2559
Still gonna recommend this book. https://www.ebay.com/itm/Solid-Stat...id=2137676&hash=item3ad4a5fb1d:i:252675750685 Even if you don't know the math to derive the laser rate equations, that does not mean that you won't find the stuff on flashlamp parameters and cavity design super useful.Interesting they need a small inductor in series to limit the current rise time. Didn't know that with high power xenon tubes.
Still gonna recommend this book. https://www.ebay.com/itm/Solid-Stat...id=2137676&hash=item3ad4a5fb1d:i:252675750685 Even if you don't know the math to derive the laser rate equations, that does not mean that you won't find the stuff on flashlamp parameters and cavity design super useful.
But yeah the inductor is important. If the lamp fires too fast for a given energy you will degrade its lifetime.
As a separate note you have to make sure the entire rod is pumped by the lamp. Ruby is a 3 level laser system, so if you only pump a portion of it, the unpumped portion will just absorb the output.