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Old 09-15-2008, 08:27 PM #1
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Default Calculate the expansion of a laser beam

I have do some trigonometric calculation, to calculate the expansion of a laser beam, knowing the distance of the "target".
I'm not very good in math, then if I have done any error, please let me know
Sorry for the very bad schematic beam, I have drawn it very large to simplify the read.
I have divided the beam in three parts: two equals triangle and a little straight rectangle, that is the ideal beam.
The expansion is the summation of those three parts at the end, when the beam hit the target.
See the pic.

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Old 09-15-2008, 08:33 PM #2
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Default Re: Calculate the expansion of a laser beam

My recommendation is to leave the results in radians, do not convert to degrees. I'll tell you a little secret about mathematics and science nobody uses degrees it's all radians. Do not convert to degrees when taking your measurements either, use a tangent form.
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Old 09-15-2008, 08:52 PM #3
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Default Re: Calculate the expansion of a laser beam

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Originally Posted by FrothyChimp
My recommendation is to leave the results in radians, do not convert to degrees. I'll tell you a little secret about mathematics and science nobody uses degrees it's all radians. Do not convert to degrees when taking your measurements either, use a tangent form.

Thanks, I have used degrees, because at school, with trigonometric function, we use only degrees, not radians. I use radians only in mechanic.
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Old 09-15-2008, 08:56 PM #4
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Default Re: Calculate the expansion of a laser beam

Once you get into calculus the degree will go the way of the dodo. You will encounter it in physics problems but degrees will disappear quite quickly.
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