[Laser] last message was 8/12/2016?

[Chuck Hast]

Glenn
We are discussing the grating used to refract a laser beam in order to in
this case measure the wave length. When I run the formula to do the
calculation, I ended up off, and due to the fact that the formula does not
appear to take into account the width of the lines which function to form
the grate that is doing the refraction.  Jim determined that each line was
about 152 nm so the distance from line center is 1 um but the spacing is
848 nm. With that value my calculations came out as they should. Now I
have to figure the width of the grating lines on other grating so that my
numbers come out good.

A fun exercise in working with lasers and obtaining the solutions I needed.



On Mon, May 14, 2018 at 6:54 PM, Glenn Thomas <glennt at gbis.com> wrote:

> Just a lurkers thought...
>
> The spectrum line from a coherent monochromatic source should be zero
> width. It's not quite because of thermal doppler in the individual
> emitting atoms in the source. Other than that spreading, monochromatic
> should be zero width and any width that is observed (other than thermal
> doppler) should be an artifact of the instrument.
>
> So, what kind of width did you observe?
>
> 73 de Glenn wb6w
> (back into lurk mode...)
>
> On 5/14/2018 4:30 PM, Chuck Hast wrote:
> > That did it. I went back through and all of the indications I had on
> > different
> > documents do a calculation to figure out the distance between lines but
> the
> > lines are ZERO width, now that I look at it. That cannot be, or I am
> missing
> > something.
> >
> > Take a look at the UCLA video here, I do not see where he takes into
> account
> > line width just spacing from center of line to center of line.
> >
> > https://www.youtube.com/watch?v=E-3uht9LAhM
> >
> > Several others have given the same calculation, I end up at the same
> thing
> > Spacing = 1 um, so the line is infinitely small based on that. Of course
> we
> > know
> > it is not.
> >
> >
>
> --
> "i" before "e" except after "c", or when sounded as "a" as in neighbor and
> weigh.
>
> This rule is “counterfeit”. General spelling rules “forfeit” generality.
> They are “foreign”, being not “either” or “neither”, possibly the result
> of some
> “leisure” activity of a “sovereign heir” who, lacking “height”, is
> studying,
> without “conscience, inefficient glacier science”. It’s not as nutritious
> as "protein". It's just plain old "weird"
>
> Is this example “sufficient”?
>
>
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-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960