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Old 09-27-2010, 02:39 AM #1
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Default Diode pump a ruby laser?

Instead of flashlamp pumping a ruby rod laser, what about diode pumping? Does anyone know what pump frequency a 694.3 nm ruby rod likes best?


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Old 09-27-2010, 02:41 AM #2
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Default Re: Diode pump a ruby laser?

Technically you can use the 445nm diodes to pump it, but there's a problem, heat. I know of only one CW use of ruby laser rods, a very small piece was pumped by a 5W argon and even that barely produced any power out, the ruby rod was cooled with LN2. In theory you could align a couple XJ-A140 arrays with the knife-edge assemblies and go to town, so long as you don't mind your ruby rod shattering from thermal expansion.


Edit: It's also a Three-Level lasing medium. And the first CW attempt was using mercury arc lamps.

Quote:
"A CW-pumped ruby laser, which used a rod 2 mm in diameter and 50 mm in length, generated an output of 1.3 watts at an input of 2.9 kW. Only a small part of the crystal's cross-section was excited by the filament arc, and lasing action occurred only in the small volume of 6 x 10-3 cm3. Using this value, the lamp input power per unit volume of active material required to obtain threshold is approximately 230 kW/cm3. The main reason for the poor efficiency was the low absorption of useful pump light by the small lasing volume."
Read more here: http://www.repairfaq.org/sam/laserssl.htm#sslcwr
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Old 09-27-2010, 03:15 AM #3
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Default Re: Diode pump a ruby laser?

Blech!
I was afraid of that. I found a reference to a German(?) company that WAS going to sell a small diode pumped CW laser but now it points to a dead end on their website.

Thanks for your help!

Mu

PS- I did find this...
GemologyOnline.com :: View topic - more ruby comparison
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Old 09-28-2010, 02:36 PM #4
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Default Re: Diode pump a ruby laser?

I had no trouble loading the data sheet:

http://www.klastech.com/download/ipjmqq

Klastech uses resonance to build up a high enough 532 nm field from a green dpss to pump a tec cooled, tiny, ruby crystal and get cw. IE Fox Smith Interferometer. Consider thet 514 is on the edge of the ruby pump band, and 532 is in the middle, so much more conversion, and no need for the Ln2.

SAM and I are updating the Ruby chapter.

Steve

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Old 10-14-2010, 04:58 AM #5
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Default Re: Diode pump a ruby laser?

I think ruby runs as a relaxation oscillator. The lower laser level is ground. In a basic flashlamp pumped system, a single pulse contains many sub-pulses: tiny pulses within a pulse. In theory it could oscillate continuously, but the rod would overheat due to the amount of energy needed from a broad band source.

I've pondered the possibility of transvers pumping a ruby. It could be pumped by a dye laser, and the dye laser beam could be focused to a line on the surface of the ruby. The pumping technique would be identical to how dye lasers are pumped using nitrogen lasers. However, a normal laser ruby would not work. It would require a ruby with high enough chromium content to absorb the dye laser beam at the surface - the same way R6G must be heavily concentrated in order to absorb all of the pump beam at it's surface. The main problem is that I do not know if such a ruby could be made to lase at all, let alone generate the common 694nm wavelength. Chromium might no longer be fluorescent enough, once heavily concentrated. Another problem is the fact that ruby is a 3 level laser. With the lower laser level being ground, over 50% of the chromium atoms must be excited before any laser activity is even possible. I believe that is part of the reason why the threshold of ruby is so horribly high. Once heavily concentrated, it might be correspondingly harder to reach threshold given the greater number of chromium atoms: ruby absorbs it's own output if unpumped! So what might be required, is some kind of balancing act: a balance between energy density via extinction depth of the pump beam, and percentage of chromium concentration. Again - not sure how chromium concentration affects lasing, if all other factors remain unchanged.

I'm just curious. I wouldn't be trying to do anything practical with such a setup. However, the peak power of a pulsed dye laser is higher than that of any CW laser I've encountered. So pumping with a pulsed dye laser might not be that difficult (just for a fun experiment) compared to doing the same using a diode laser based pump.

Jarrod

Last edited by jarrod694; 10-14-2010 at 05:32 AM.
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