Hi

I am trying to remember how to determine energy loss from scatter due
to surface roughness. Perhaps someone out there can tell me or jog my
memory for the equation that estimates the energy scatter due to RMS
surface roughness. My application is a laser off of a mirror.

Thanks for any and all help,
Philip

"anorton" <anor...@removethis.ix.netcom.com> wrote in message

news:Qe6dnRIqsoA_H2HanZ2dnUVZ_uOmnZ2d@earthlink.com...





"Philip McCulloch" <philip.mccull...@gmail.com> wrote in message
news:77a38a96-122b-43a3-acdf-0ebfed2f70ee@m44g2000hsc.googlegroups.com...
Hi

I am trying to remember how to determine energy loss from scatter due
to surface roughness.  Perhaps someone out there can tell me or jog my
memory for the equation that estimates the energy scatter due to RMS
surface roughness.  My application is a laser off of a mirror.

Thanks for any and all help,
Philip

Total Integrated Scatter (TIS)
            = 1 - exp( -(4*pi*rmsroughness*cos(aoi)/lambda)^2 )
--
Adam Norton

Hi Adam -

I was waiting for someone to answer that question as I was curious about the
form of the equation.

Do you have a reference for that equation?  I'm curious how it was derived.
Seems like RMSRoughness must have same units as lambda^2.  Also seems as if
the definition of RMSRoughness must be such that there is no proportionality
constant (other than the 4*pi).

Sincerely,

John- Hide quoted text -

- Show quoted text -

"Philip McCulloch" <philip.mcculloch@gmail.com> wrote in message
news:77a38a96-122b-43a3-acdf-0ebfed2f70ee@m44g2000hsc.googlegroups.com...
Hi

I am trying to remember how to determine energy loss from scatter due
to surface roughness. Perhaps someone out there can tell me or jog my
memory for the equation that estimates the energy scatter due to RMS
surface roughness. My application is a laser off of a mirror.

Thanks for any and all help,
Philip

Total Integrated Scatter (TIS)
= 1 - exp( -(4*pi*rmsroughness*cos(aoi)/lambda)^2 )
--
Adam Norton

Hi Adam -

Page 9 of the linked document below gives a form of the TIS equation
as it relates to RMS roughness and cites a reference:

http://www.breault.com/resources/kbasePDF/brotg0922_scatter.pdf

In article
b5709ca4-531f-4360-92db-17ff0afebebc@l42g2000hsc.googlegroups.com>,
Boxman <boxman@voyager.net> wrote:


Page 9 of the linked document below gives a form of the TIS equation
as it relates to RMS roughness and cites a reference:

http://www.breault.com/resources/kbasePDF/brotg0922_scatter.pdf

The physical understanding is fairly straightforward: describe the
surface as a superposition of many _small_ (i.e., weak) random phase
gratings (random in period and in amplitude). Add up the power
scatterings from each. This should basically lead you to the formula
cited (with the condition that the exponent term be small compared to
unity).

"anorton" <anorton@removethis.ix.netcom.com> wrote in message
news:Qe6dnRIqsoA_H2HanZ2dnUVZ_uOmnZ2d@earthlink.com...
"Philip McCulloch" <philip.mcculloch@gmail.com> wrote in message
news:77a38a96-122b-43a3-acdf-0ebfed2f70ee@m44g2000hsc.googlegroups.com...
Hi

I am trying to remember how to determine energy loss from scatter due
to surface roughness. Perhaps someone out there can tell me or jog my
memory for the equation that estimates the energy scatter due to RMS
surface roughness. My application is a laser off of a mirror.

Thanks for any and all help,
Philip
Total Integrated Scatter (TIS)
= 1 - exp( -(4*pi*rmsroughness*cos(aoi)/lambda)^2 )
--
Adam Norton

Hi Adam -

I was waiting for someone to answer that question as I was curious about the
form of the equation.

Do you have a reference for that equation? I'm curious how it was derived.
Seems like RMSRoughness must have same units as lambda^2. Also seems as if
the definition of RMSRoughness must be such that there is no proportionality
constant (other than the 4*pi).

Sincerely,

John


If you take a plane wave coming in at some angle theta, and bounce it