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Science Forum Index » Physics - Electromagnetic Forum » lasers
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| MC Felon |
 Posted: Thu Dec 27, 2007 4:14 am |
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Hello.
I would like to know if there exists any equation relating intensity
of light (luminous) and wavelength. Sorry for such a basic question,
but i'm very fresh to EMR study. Also, what's the minimum frequency
required for a laser to drill through steel?
Thanks in advance. |
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| Benj |
| Posted: Thu Dec 27, 2007 4:36 pm |
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On Dec 27, 9:14 am, MC Felon <paec....@gmail.com> wrote:
Quote: Hello.
I would like to know if there exists any equation relating intensity
of light (luminous) and wavelength. Sorry for such a basic question,
but i'm very fresh to EMR study. Also, what's the minimum frequency
required for a laser to drill through steel?
Thanks in advance.
Dear Newbie:
There is no equation between intensity and wavelength because they are
obviously independent parameters.
As for drilling steel the process is far more complex than you
imagine. Do some research on laser drilling using lasers of various
types. |
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| MC Felon |
| Posted: Thu Dec 27, 2007 5:17 pm |
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Guest
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I'm searching for a scientific overview of lasers.
Meanwhile, i have a doubt. As i understand it, lasers of high
frequencies have high penetrating power (which is why we make the
light reflect in between two mirrors repeatedly). Using the Rydberg
equation, i found that the photon discharge of hydrogen excitation
from principle quantum number 1 to 2 has a wavelength of 121.5nm.
This implies a high frequency. It's approximately 2.43 x 10(to the
power 17)Hz. This is higher than that of a ruby laser. Hence, why do
we use ruby laser for drilling when we can have a hydrogen laser? |
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| Benj |
| Posted: Thu Dec 27, 2007 7:19 pm |
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Guest
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On Dec 27, 10:17 pm, MC Felon <paec....@gmail.com> wrote:
Quote: I'm searching for a scientific overview of lasers.
Meanwhile, i have a doubt. As i understand it, lasers of high
frequencies have high penetrating power (which is why we make the
light reflect in between two mirrors repeatedly). Using the Rydberg
equation, i found that the photon discharge of hydrogen excitation
from principle quantum number 1 to 2 has a wavelength of 121.5nm.
This implies a high frequency. It's approximately 2.43 x 10(to the
power 17)Hz. This is higher than that of a ruby laser. Hence, why do
we use ruby laser for drilling when we can have a hydrogen laser?
As I said laser drilling is far more complex than this. One main
consideration is the reflectivity of the material being drilled. What
you want is the light energy to be absorbed in the metal and melt it.
If it's reflected it bounces harmlessly away. On the other had for
some materials there is the problem of transparency at certain
wavelengths. Generally speaking as you go toward the ultraviolet
things tend to reflect less and absorb more, but it's much more
difficult to get a UV laser at high power levels. So there are a LOT
of practical questions here when it comes to laser drilling/cutting/
welding. And I didn't even mention the problems from the plasma that
forms from the intense beam. OK? |
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| Guest |
| Posted: Fri Dec 28, 2007 1:25 am |
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MC Felon <paec.nwa@gmail.com> wrote:
Quote: I'm searching for a scientific overview of lasers.
Meanwhile, i have a doubt. As i understand it, lasers of high
frequencies have high penetrating power (which is why we make the
light reflect in between two mirrors repeatedly). Using the Rydberg
equation, i found that the photon discharge of hydrogen excitation
from principle quantum number 1 to 2 has a wavelength of 121.5nm.
This implies a high frequency. It's approximately 2.43 x 10(to the
power 17)Hz. This is higher than that of a ruby laser. Hence, why do
we use ruby laser for drilling when we can have a hydrogen laser?
The laser used for any particular application will be the cheapest
hardware that will do the job.
No one in the real world gives a rat's ass about anything other than
the cost of ownership.
And BTW, you need to read how lasers work before you make any more
statements about why things are.
Google "laser theory", 22,400 hits.
--
Jim Pennino
Remove .spam.sux to reply. |
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| MC Felon |
| Posted: Fri Dec 28, 2007 2:43 am |
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On Dec 28, 10:25 am, j...@specsol.spam.sux.com wrote:
Quote: MC Felon <paec....@gmail.com> wrote:
I'm searching for a scientific overview of lasers.
Meanwhile, i have a doubt. As i understand it, lasers of high
frequencies have high penetrating power (which is why we make the
light reflect in between two mirrors repeatedly). Using the Rydberg
equation, i found that the photon discharge of hydrogen excitation
from principle quantum number 1 to 2 has a wavelength of 121.5nm.
This implies a high frequency. It's approximately 2.43 x 10(to the
power 17)Hz. This is higher than that of a ruby laser. Hence, why do
we use ruby laser for drilling when we can have a hydrogen laser?
The laser used for any particular application will be the cheapest
hardware that will do the job.
No one in the real world gives a rat's ass about anything other than
the cost of ownership.
And BTW, you need to read how lasers work before you make any more
statements about why things are.
Google "laser theory", 22,400 hits.
--
Jim Pennino
Remove .spam.sux to reply.
thank you and thanks benj. i guess i'll close this post seeing as i
have far too much to learn before trying to think stuff about lasers. |
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| Autymn D. C. |
| Posted: Mon Dec 31, 2007 1:33 am |
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Guest
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On Dec 27, 6:36 pm, Benj <bjac...@iwaynet.net> wrote:
Quote: On Dec 27, 9:14 am, MC Felon <paec....@gmail.com> wrote:
Hello.
I would like to know if there exists any equation relating intensity
of light (luminous) and wavelength. Sorry for such a basic question,
but i'm very fresh to EMR study. Also, what's the minimum frequency
required for a laser to drill through steel?
Thanks in advance.
Dear Newbie:
There is no equation between intensity and wavelength because they are
obviously independent parameters.
I = hc/s4Prrr; r=s or r=hc/kqq
Quote: As for drilling steel the process is far more complex than you
imagine. Do some research on laser drilling using lasers of various
types.
possibil with masers and small apertures?
-Aut |
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