Optics is the study of light, and its interaction with matter. It includes topics such as imaging systems, fiber optics, lasers, quantum optics, and more.

learn more… | top users | synonyms

1
vote
0answers
114 views

If a beam of light follows the path $y(x)=y_0\sin(x/y_0)$, what is the index of refraction?

An exam question that showed up while I was studying: A plane wave refracts and follows a ray given by the equation $y=y_0\sin(x/y_0)$ where $y_0$ is a constant. Find the refractive index $n(y)$ ...
1
vote
0answers
46 views

Conceptual way of understanding what material 'does' at critical angle

I would like a conceptual way of understanding how a material behaves at the critical angle. So why does it all reflect? I can see why it reflects in the maths, but conceptually, it doesn't make ...
1
vote
0answers
103 views

How to calculate the helicity of polarized light?

At first, I used to think that only circular polarized light has non-zero helicity, linear polarized light has zero helicity, because the linear polarization can be seperated as the superposition of ...
1
vote
0answers
61 views

C Method for Diffraction grating

Alright, so I am trying to find the efficiencies of a coated diffraction grating through the method in this paper. This is through a change of coordinate system. So I went through and derived all of ...
1
vote
0answers
53 views

Is there spatial data loss in light passing through transparent crystal?

There is perfect parallelepipedal bar made of transparent crystal with cubic lattice floating in vacuum. Faces of parallelepiped are parallel to lattice axis. There is image, forming checkerboard ...
1
vote
0answers
95 views

3D holograms like Miku Hatsune? How do you make such things?

I am making a speech about Miku Hatsune 3D hologram, and I would like to know how they are made! I love Miku and Len...(drools) please help by explaining!
1
vote
0answers
352 views

How does a Fresnel rhomb work (half and quarter wave plate)?

How does a Fresnel rhomb work (half and quarter wave plate)? I am aware of birefringence, which creates a phase shift of $\Delta\phi=\dfrac{2\pi\Delta nL}{\lambda_0}$. But this doesn't explain how a ...
1
vote
0answers
60 views

How to calculate the correct coordinates from a distorted video of a projectile?

I am working on a high school project that is related to projectile motion. I am exploring how exactly the position of the center of mass affects the trajectory of a long but thin, javelin-like ...
1
vote
0answers
62 views

How does a lens affect the field of view in a mirror?

If one looks into a mirror, he can see a certain field of view. If he places a convex lens that magnifies (or a concave lens that does the opposite) in front of the mirror, but so that he can still ...
1
vote
0answers
130 views

Why are subjects upside down when I look through my door peephole?

There is a convex lens 3/4" on the outside and 1 1/2" convex lens on the inside. Each lens has one flat side facing out and one convex side facing in. What can be done to correct this image?
1
vote
0answers
233 views

What are Jones matrices and how to derive them?

I'm coding a software for an optics lab I'm working in and I need to know how to derive expressions for Jones matrices for various polarizes. What does a Jones matrix represent and how would you ...
1
vote
0answers
285 views

how does phase-shifting principle in interferometry work?

I have been using the coherence scanning interferometry (or also known as white light scanner), where it collects images containing the fringes. The system is able to produce the depth profile for one ...
1
vote
0answers
506 views

How to use the Coddington shape factor?

We are given $\sigma=\frac{r2+r1}{r2-r1}$, with $\sigma$ being the Coddington shape factor. What I am having problems with is solving for $r1$ and $r2$ when I am just given a focal length and a ...
1
vote
0answers
71 views

Quadrature Separation in Homodyne Detector

I am wondering in Homodyne detector structure with a beamsplitter, why phase of input beam to beamsplitter can be conjugated? I mean for example for an input beam operator b onto the beamsplitter at ...
1
vote
0answers
257 views

What defines the thickness of a Nomarski prism?

Lets say I want to design a Nomarski prism that would split the ordinary and extraordinary beam by an angle of 0.32 mrad. I used a raytracer to find the internal angle between the quartz wedges. ...
0
votes
0answers
27 views

Difference between the increase in optical path due to refraction and that due to reflection

If we place two glass plates of refractive index n and each having thickness t,on the way of a light ray the increase in optical path becomes (S2P-S1P)=2(n-1)t due to refraction through them,and the ...
0
votes
0answers
39 views

Alternate young double slit experiment

What will happen in young's double slit experiment, when instead of screen I put a black screen with a hole and a second screen behind the black one. Will it still form interference pattern albeit a ...
0
votes
0answers
7 views

Impact of Ag nano-particle size on OPV efficiency : simulation

I would like to simulate the impact of gold nano particles size on the efficiency of Organic photovoltaic devices(inverted ofcourse) looking for any simulation plateform where this idea could be done ...
0
votes
0answers
19 views

Mode groups in an optical fiber

I know what modes in an optical fiber mean but what are exactly mode groups in an optical fiber? From what I read until now, I have the impression that modes that have close propagation constants ...
0
votes
0answers
47 views

How to demonstrate total internal reflection?

How can we demonstrate total internal reflection practically to explain it clearly?
0
votes
0answers
23 views

Would electron degenerate matter be a good x-ray reflector?

I do not know much about x-ray physics or degenerate matter, but I have the intuitive feeling that the high electron density and what must be some crazy band structures in electron degenerate matter ...
0
votes
0answers
37 views

Brewster angle and perpendicular component

Fresnel's equations give that at Brewster's angle, the parallel component of the incident light is zero. The reflected perpendicular component is not zero, though. We can "remove" this component using ...
0
votes
0answers
18 views

Does the photon-phonon interaction always rotates the photon polarization of 90°?

I'm reading about the acousto-optic effect and on the Acousto-Optical Tunable Filters on particular and wanted to understand the physics under its working. I found this paper ...
0
votes
0answers
19 views

Radiometric Intensity of Non-Monochromatic LED

So I have a problem with the LED with the spectrum shown below I am asked to find the radiometric intensity in Watts/steradian given that the LED produces $5.6\times 10^{-3}$ mcd. We are also told ...
0
votes
0answers
34 views

Spatial light modulation for mode multiplexing, how does it work?

If a laser light becomes spatial phase modulated (by phase only spatial light modulator) what happens to the intensity distribution and frequency spectrum of the laser light ? I know that this ...
0
votes
0answers
62 views

Bragg's law in photonic crystals

So in photonic crystals when looking at diffraction the refraction of light has to be taken into account. I am told this would lead to the "photonic bragg's law" which is $$n \lambda = ...
0
votes
0answers
68 views

Reflection and transmission at an interface with a complex index of refraction — is Jackson wrong?

When you model reflection and transmission at an interface, the meaningful results are the reflection and transmission amplitudes, which are the ratios: $R = \frac{I_{refl}}{I_{inc}}$ and $T = ...
0
votes
0answers
58 views

Lenses and benefit of exact fourier transform

I have learned in an Optics class that a lens will "compute" the Fourier Transform of an electromagnetic wave passing through it at the focal point behind it (but with a quadratic phase). However, ...
0
votes
0answers
27 views

periodicity of diffraction gratings

Imagine we have a diffraction grating consisting of N slits (being N very large) with a separation of "d" from slit to slit. Now, we could regard this grating as a diffraction grating constructed by ...
0
votes
0answers
149 views

holographic projection in thin air?

from where I come from ,they taught us in high school that it is possible to project holograms in thin air simply by illuminating the hologram with the "correct light" , and having a semi transparent ...
0
votes
0answers
35 views

What is this area on a lens seen from extreme angle?

This has been a secret to me since childhood: a normal lens made of glass in front of a white LCD screen (shot with a crappy phone camera)... ...if viewed from an extreme angle shows a very ...
0
votes
0answers
50 views

Finesse of an Fabry-Pérot interferometer

during an undergrad experiment we have to estimate the finesse of an Fabry-Pérot interferometer. The reflectance $R$ is given so the theoretical value can be calculated by $\mathcal{F} = ...
0
votes
0answers
44 views

How to explain polarization in Zeeman effect

In the Zeeman effect, when we observe along the $B$ field, the polarization of light should be circular polarized. It can be understood by the conservation of angular momentum. $\Delta m=0$ can not be ...
0
votes
0answers
68 views

Why do I get different colours in scratched holograms?

I was making a scratched holograms and in result got different colours instead of white hologram
0
votes
0answers
54 views

How to calculate max/min Right Ascension and Declination in telescope field of view

I have a telescope with focal length 1200mm. My camera has 5184x3456 pixels with size 4.3um. This combination should give me a resolution of 0.74"/pixel and thus a field of view of 1.06° x 0.71°. ...
0
votes
0answers
33 views

Is this possible? LCD right in front of the eye

I came across these swimming goggles with a LCD display integrated right on the goggle itself. ...
0
votes
0answers
168 views

Simulating the Interference Pattern of Fraunhofer Diffraction by a Single Slit

I'm attempting to simulate the Fraunhofer diffraction pattern due to a single slit. We know that the intensity at an angle θ is $I(\theta)=I_0Sinc^2(\beta)$ where $\beta=kb{Sin(\theta)\over 2}$ ...
0
votes
0answers
66 views

How can I measure the spacing of a diffraction grating?

How can I measure the spacing of a diffraction grating using the light from different LED diodes, resistor and battery?
0
votes
0answers
98 views

Problems at arriving on the fresnel drag coefficient $k=1-{1 \over n^2}$

I was studying about the Fizeau Water Experiment of 1851(I know the aether drag hypothesis has been replaced by Relativity, but I still wish to know the mathematical thinking about aether). So at one ...
0
votes
0answers
133 views

Cylindrical lens aberration fixed by roll

I have two cylindrical lenses essentially forming a beam expander. The problem that I am having is that I am seeing a very strange aberration. The image becomes "squashed". Cylindrical lenses only ...
0
votes
0answers
105 views

Determing aperture size for space-based-solar-power laser transmitter

I have hit a bit of a roadblock in my simulation. In the equation I require the aperture size for the laser source. $$I_a ≈ \frac{\lambda d}{A}$$ $I_a$ = aperture atop the atmosphere ($m$) ...
0
votes
0answers
23 views

What are physical effects that could be employed to emulate this system?

This is a simple system consisting of a tree of numbers such as ((1 2 (3 4)) (2 6) 1 6) and a rule of application, that states that a tree A applied to B is a copy ...
0
votes
0answers
39 views

Intensity change in reflected light for transverse magnetooptical Kerr effect?

I want to do some simple calculations for the (transverse) magneto-optical Kerr effect, to calculate what the change in intensity would be in the light reflected off of a magnetic medium. (I'm ...
0
votes
0answers
116 views

Far Field lens Imaging…Does k-wave number follow arc length equation?

If we are imaging light in the far field region. We have three situations/relations (illustrated below): Arc Length: We know the distance subtended (S) by the light ray in a lens-less system will be ...
0
votes
0answers
32 views

What is the pattern in the defocused circular image if I watch a shiny object close to my eyes?

Let's assume I have a round shiny object (eg. a spoon or the glass of a light bulb), so the distant lamp's reflection is just a shiny point on it. Now if I put the object close to my eyes and look at ...
0
votes
0answers
70 views

Photometric versus radiometric and spectral quantities

Are spectral quantities the same as photometric quantities? How do you pass from a radiometric quantity $R$ to the correspondent spectral quantity $R_λ$ I've been ask to pass from Irradiance to ...
0
votes
0answers
51 views

What is the magnification of the ESO VLT?

If I had to build an instrument for use on the VLT what happens with the on-sky angular separation? When the angular separation on-sky would be $x$ arcseconds, what would it be in my instrument?
0
votes
0answers
77 views

Is my textbook in error about this geometric optics relation?

Given a centered optical system (having an axis of rotational symmetry), let $H_1$ be the intersection of the optical axis and the "principal object plane" (I'm studying in French and have no idea how ...
0
votes
0answers
69 views

equilibrium intensity Helmoltz equation

Helmoltz equation describes the evolution of the bulk electromagnetic field, even when doing scalar optics as an approximation. Beam Propagation Method is a common approximation that assumes certain ...
0
votes
0answers
37 views

Direct Normal Insolation

I need a help please.I'm struggling to know how to convert from KWh/m2/day to a flux unit. For example, if I have a Direct Normal Insolation (DNI) that is equal to 7.41 KWh/m2/day, how can I convert ...