The beam tag has no wiki summary.
4
votes
0answers
151 views
Mirrors and light beam divergence technology limits
There are many applications for orbital space mirrors in astronomy (better telescopes) and space propulsion (solar power for deep space probes), but this is limited by the minimum beam divergence ...
3
votes
1answer
243 views
Beam splitters- Direction of use
There are two cases I'm asking about. The square in the middle is a cube beam splitter in the same orientation for both cases. We are looking at the beam splitter from the top. In the first case, ...
3
votes
2answers
361 views
What is the mathematical formulation for buckling?
Argument: Buckling is an engineering concept that can only be applied to thin columns with compressive loading.
(Is it possible to) Prove the above sentence right or wrong with mathematical ...
1
vote
1answer
189 views
Euler's buckling formula applicable for impact calculations?
$$F = \frac{\pi^2 EI}{(KL)^2}$$
Is Euler's buckling formula applicable for impact calculations, considering speeds relevant for a car or aircraft crash?
If there is a level where the formula ...
1
vote
1answer
335 views
Free boundary conditions
I am trying to simulate liquid film evaporation with free boundary conditions (in cartesian coordinates) and my boundary conditions are thus:
$$
\frac{\partial h}{\partial x} = 0, \qquad (1)
$$
$$
...
1
vote
1answer
203 views
Transparent boundary condition. Beam propagation method
I am interested in the finite-difference beam propagation method and its applications. I try to solve the Helmholtz equation. At first, i would like to solve numerically it for the easiest case, ...
1
vote
0answers
66 views
Photon Statistics of a Coherent Gaussian Beam [closed]
Assume that a 100 pW He-Ne single-mode last emits light at 633 nm in a TEM00 Gaussian beam.
(a)What is the mean number of photons crossing a circle of radius equal to the waist radius of the beam ...
1
vote
0answers
121 views
Help With Difficult Deductive Proof [closed]
Suppose we have a Gaussian beam with a complex envelope expressed by the following equation 1:
$$\tag{1}
A_G(x,y,z) = \frac{A_1}{q(z)} e^{-ik \frac{x^2 + y^2}{2q(z)}}
$$
where
$$
q(z) = z+iz_0
$$
...
0
votes
1answer
110 views
Width of Gaussian Beam and Refractive Index
I know that in free space, the width of a Gaussian beam can be written as $W=W_0\sqrt{1+(\frac{z}{z_0})^{2}}$. However, I was wondering if it was possible to express this width as a function of ...
0
votes
0answers
41 views
EigenMode expansion for beam propagation
I want to understand how to apply EigenMode expansion method (http://www.photond.com/files/docs/PW03_eme_paper.pdf) for beam propagation on a system of lenses.
The interface between two mediums of ...
0
votes
1answer
46 views
How to calculate beam spread of a non-point light source via an aspheric lens
I need to determine the angle, or rate of divergence of light from a single aspheric lens when I place a non-point light source (e.g. LED array) at a given distance from the lens which is less than ...
-1
votes
1answer
148 views
muon neutrino momentum distribution
muon neutrino momentum distribution
I have read the public data of T2K ,KEK to find this subject, I'm curiously that it's coincides with my prediction perfectly: The neutrino get its momemtum by its ...
