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Old 06-02-2015, 04:58 PM #1
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Default Laser amplification

Hello all,

I'm relatively new to lasers but I love playing with new things. I recently came across a shop that was offering Erbium laser rods for a pretty decent price, and I was wondering what kind of amplification power something like this would give?

I love tinkering, and I was curious specifically about the power of the laser it could produce with 15 focused 350 mW IR laser diodes. Is the additional power per cost efficiency a worthwhile investment?

Thanks!
Chris



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Old 06-02-2015, 07:54 PM #2
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Default Re: Laser amplification

Quote:
Originally Posted by clamport View Post
Hello all,

I'm relatively new to lasers but I love playing with new things. I recently came across a shop that was offering Erbium laser rods for a pretty decent price, and I was wondering what kind of amplification power something like this would give?

I love tinkering, and I was curious specifically about the power of the laser it could produce with 15 focused 350 mW IR laser diodes. Is the additional power per cost efficiency a worthwhile investment?

Thanks!
Chris
It won't give any amplification power.

You're not going to have an output any greater than your input, so 15*0.35=5.25W input to get <5.25W (significantly less in practice) output at a different wavelength. You would also need optics to collimate or focus both the pump beams and the output beams as well as mirrors to form a resonator. Not to mention designing/buying/building the mounting hardware.

An example of the efficiency you can expect - ~120W at 808nm side pumping a 3mmx65mm 0.6% doped Nd:YAG rod would yield maybe ~50W at 1064nm. That's 42% optical efficiency - electrical efficiency is even worse at around 14-15%. I'm not sure how efficient Er doped rods are, but it'll be around those figures.
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Old 06-07-2015, 03:32 AM #3
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Default Re: Laser amplification

Looks like a huge project to pull that off, better to just buy a surplus diode pumped ND YAG.

Chris
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Old 06-07-2015, 05:48 PM #4
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Default Re: Laser amplification

Yeah, unless it's something exotic, or you want the challenge, building a pulsed rod laser is too expensive to generally be worth it. Er and Nd YAGs are best pumped with flash lamps, or with very powerful diodes in a highly reflective chamber that is flood cooled with water often times. They're very expensive to make, so buying a premade one can be cheapest with patience and a lot less frustration. Don't want to spend too much time reinventing the wheel. I have a cth:yag, which might warrant building due to its uniqueness, but common YAGs may or may not be worth it unless you are well equipped.
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Old 06-07-2015, 07:24 PM #5
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Default Re: Laser amplification

Quote:
Originally Posted by ultimatekaiser View Post
Yeah, unless it's something exotic, or you want the challenge, building a pulsed rod laser is too expensive to generally be worth it. Er and Nd YAGs are best pumped with flash lamps, or with very powerful diodes in a highly reflective chamber that is flood cooled with water often times. They're very expensive to make, so buying a premade one can be cheapest with patience and a lot less frustration. Don't want to spend too much time reinventing the wheel. I have a cth:yag, which might warrant building due to its uniqueness, but common YAGs may or may not be worth it unless you are well equipped.
Easier to buy one of those ready built units from China and whack some mirrors on each end if you're going down the DIY YAG route. Cooling taken care of, diode arrays built in, all that nice stuff.

That's the way I'd do it unless I had about $10,000 sitting spare to have the components made. A pump chamber alone can be expensive, never mind the CNC machined parts, which will probably be one offs, and then all of the optics.
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Old 06-07-2015, 07:57 PM #6
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Default Re: Laser amplification

The longer i live the more i wish i had a cnc mill
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Old 06-07-2015, 09:04 PM #7
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Default Re: Laser amplification

Quote:
Originally Posted by Alaskan View Post
The longer i live the more i wish i had a cnc mill
As well as a 3D printer and a laser cutter. Would make life much easier.
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445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
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488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
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