 | | From: | slxrti at sbcglobal.net | | Subject: | How to improve ND:YAG laser Efficiency? | | Date: | 20 Jan 2005 21:19:32 -0800 |
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 | Hi' Im interested in understanding the areas which improve
the efficiency of a ND:YAG laser.
I was told to expect about 3 to 4% in pulse applications.
For instance, for a input to a flash lamp of 40 joules I can expect at
best 1.6 joule at the laser head. w
Is there a method to increase the conversion efficiency to 6%?
Thanks, Slxrti
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| | From: | slxrti at sbcglobal.net | | Subject: | Re: How to improve ND:YAG laser Efficiency? | | Date: | 23 Jan 2005 21:26:52 -0800 |
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| My objective is to improve the conversion efficiency, defined by input
power to the flash lamp (joule) to output power at fiber tip(1000um
finer).
The laser is optimized for anther wavelength (2.1um), not 1064nm.
"That laser may be highly optimized already and without
understanding all the aspects of the design, any change is more likely
to make it worse."
Hopefully that is not the case, If I can understand the problem
completely then
I can ask the correct question. Which will constraint what options are
available.
I'm not a expert in resonators/cavity or optic design, but I'm
willing to learns from others.
>From my experience, the optimization process of the above has been
reititive and some times costly.
Your in slight would be invited, If you need more info yet me know.
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| | From: | slxrti at sbcglobal.net | | Subject: | Re: How to improve ND:YAG laser Efficiency? | | Date: | 21 Jan 2005 23:52:53 -0800 |
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| Diode pumping is not a option,
How does one enlarge the transverse mode size. I was under the
impression that thermo lensing and the rod's index of refraction
have a major impact on mode volume. These effects can be compensated
to some degree by adding a curvature to the OC, HR or to either/both
rods ends.
In my case, the laser is water cooled. So the because of the above
it's output is specified over a some what narrow temperature range
(thermo lensing).
Maybe a option would be to used Krypton/Xenon lamp does someone have
experience in this area?
Will moving the OC/HR closer to the rod improve the efficiency?
Would this material be a option: neodymium doped potassium-gadolinium
tungstate single crystal?
slxrti
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| | From: | Sam Goldwasser | | Subject: | Re: How to improve ND:YAG laser Efficiency? | | Date: | 22 Jan 2005 08:31:36 -0500 |
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| What is your objective other than to be able to say you improved the
efficiency? That laser may be highly optimized already and without
understanding all the aspects of the design, any change is more likely
to make it worse.
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slxrti@sbcglobal.net writes:
> Diode pumping is not a option,
>
> How does one enlarge the transverse mode size. I was under the
> impression that thermo lensing and the rod's index of refraction
> have a major impact on mode volume. These effects can be compensated
> to some degree by adding a curvature to the OC, HR or to either/both
> rods ends.
>
> In my case, the laser is water cooled. So the because of the above
> it's output is specified over a some what narrow temperature range
> (thermo lensing).
>
> Maybe a option would be to used Krypton/Xenon lamp does someone have
> experience in this area?
>
> Will moving the OC/HR closer to the rod improve the efficiency?
>
>
> Would this material be a option: neodymium doped potassium-gadolinium
> tungstate single crystal?
>
> slxrti
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| | From: | redbelly | | Subject: | Re: How to improve ND:YAG laser Efficiency? | | Date: | 21 Jan 2005 09:11:56 -0800 |
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| slx...@sbcglobal.net wrote:
> Is there a method to increase the conversion efficiency to 6%?
That's easy: pump with a diode.
Do you have a minimum energy requirement?
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| | From: | AES | | Subject: | Re: How to improve ND:YAG laser Efficiency? | | Date: | Fri, 21 Jan 2005 10:17:50 -0800 |
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| In article <1106327516.648354.28920@z14g2000cwz.googlegroups.com>,
"redbelly" wrote:
> slx...@sbcglobal.net wrote:
>
> > Is there a method to increase the conversion efficiency to 6%?
>
> That's easy: pump with a diode.
> Do you have a minimum energy requirement?
Very true.
Beyond (or as an alternative to) that, squeeze out every bit of internal
loss in the laser resonator; carefully adjust for the exactly optimum
output coupling; enlarge the transverse mode size to fill the laser rod
as much as possible; maybe simmer the flashlamp between pulses; work on
the pump cavity to increase the pump light transfer from flashlamp to
rod as much as possible; and if its feasible cool the rod to narrow the
linewidth and increase the gain.
But all of these approaches are hard to varying degrees, rather
expensive to try, achieve only limited improvements, and leave you with
a less robust laser (in that sense that if any of your tweaks
deteriorate, the laser output deteriorates).
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