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.

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How I can launch light into PM fiber

A polarization maintaining fiber preserves the linear polarization of the light at the output, the light at the input must be linear polarized to see signal at the photodetector... However I can't see ...
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32 views

How does light manage to change its course at the boundary of two media of different optical densities?

This is a conceptual question. I already know the law of refraction but I need something like an idea of the Physical process from both particle and wave theory standpoints. Why does a ray of light ...
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5 views

Why is forward brillouin scattering difficult to observe?

Generally we talk of only the backward Brillouin scattering. And I just know forward scattering is difficult to observe? Why is it so? Does it have something to do with phonon life time? Is it ...
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28 views

Optical system for cloning an image of a light source?

I need to create an optical system for cloning an image of a light source to human eyes. Is there a correct solution(design) for this problem. Reflectivity of the mirrors must be equal. Because ...
2
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1answer
50 views

Single particle passing through the double slit at a time [duplicate]

In modern experiments, With the classical setup of photons or electrons passing through double slit, the intensity is kept extremely low, such that one can detect a single particle passing through ...
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2answers
139 views

How to interpret single photon interference when the two possible paths are different in length?

Here is my question. I struggle with the definition of single photon interference. Let’s assume we have a Michelson interferometer and the interference pattern we observe is a single photon result, ...
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2answers
24 views

What is the formula of power of an optical instrument?

I have searched and found that the power of a lens, with surrounding medium of refractive index $n$, is $n/f$ where $f$ is the focal length, the formula is $$n/f=(n'-n)/R1 + (n-n')/R2.$$ But in my ...
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26 views

Optics modelling software

I am looking for software that could allow me to model the internals of my spectrometer. I would imagine some sort of ray tracer that allows me to add mirrors, slits, gratings etc. This way, I can see ...
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11 views

Point Spread Function of a Complicated Optical System

suppose I image a point source using a single lens, then at its focus (image plain) I'll get a spot resembling a Fourier transform of the point. As far as I know, that is defined to be the lens's PSF. ...
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18 views

About Powell lens

I am a Post graduation student and I am doing a project on the conversion of a Gaussian beam into a flat top beam using optical components. I have found that the best component to do the same is a ...
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2answers
33 views

What is the maximum of information in a beam of light?

If I look at the space I can see the Andromeda Galaxy as a small dot in the sky. If I look through a telescope, I can see the spiral shape. If the saw right through a huge telescope, I could see a ...
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25 views

Fringe Localisation

How am I to understand where the fringes of a given setup are localised? For example, Young's double slits have non-localised fringes, that is the fringes are localised (and so are well formed) at ...
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17 views

Usefulness of half-shade in Laurent half-shade polarimeter

In the Laurent half-shade polarimeter, if the half-shade weren't there, what difference would it make? The light after being polarized by the Nicol polarizer,could have entered the tube containing the ...
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48 views

Is it feasible for a lens of focal length of 1 meter to have a radius of curvature of 92.1 meters? [on hold]

Is it feasible for a lens of focal length of 1 meter to have a radius of curvature of 92.1 meters?
3
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1answer
45 views

What is incorrect about the original statement of Fermat's principle?

Here are some statements about Fermat's Principle taken from Eugene Hecht's Optics book. The original statement of Fermat's Principle : "The actual path between two points taken by a ray of light is ...
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14 views

Absortion of light by a plasma

Considering a plasma generated in a fixed volume by increasing the temperature of Helium gas from the environment temperature (this temperature is not stated) and an initial presure of 0.001 Torr, to ...
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34 views

What is angular accelerating light?

As described in this article "Our angular accelerating fields rely on combinations of orbital angular momentum - so-called twisted light," says Forbes. Light carrying orbital angular momentum ...
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35 views

Making a bright beam of artificial white light

For educational purposes, is there a way to make a narrow bright beam of white light without much equipment and without using the sun as the source? The collimated beam should be about 2 mm wide for ...
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25 views

Would an inverted design of a laser phosphor display (LPD) work?

Background info... It is my understanding that a laser phosphor display works by emitting RGB laser beams through a mechanism that cycles them in a pattern similar to a cathode ray tube. When I read ...
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19 views

Rayleigh scattering question

Usually from books, Rayleigh scattering only refers to the light scattering by neutral atoms or molecules. For example if I want to measure temperature or number density in combustion using Rayleigh ...
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1answer
28 views

Relation between Refractive Index and Reflection [closed]

I know the Fresnel equation. According to this equation, can you please tell me the relation between $n$ and $R$? I mean what happens to $R$ when $n$ increases?
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1answer
20 views

Criterion for resolvability and spot size for optical systems

Look at the following table: By spot size I mean if we have a point source for the object, the angular radius of the spot created by the source as viewed in the image plane. My question is is all ...
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0answers
35 views

Optical fibers: pulse spreading in an optical fiber due to material dispersion [closed]

I am a newbie to the world of lasers and optical fibers and was working my way through some basic problems, when I encountered this one: Calculate the pulse spreading in an optical fiber due to ...
2
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0answers
23 views

Fraunhofer Diffraction and Lenses

Suppose we have the diffraction pattern for a single slit in the Fraunhofer approximation. In order to see this diffraction patter at finite distance we locate a converging lens. Is the diffraction ...
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2answers
168 views

By what maximum amount can we concentrate sunlight?

This refers to a previous question re: Solar Cell Systems and as part of the answer the statement: If we concentrated sunlight to [the] maximum amount 42600× was given. My questions are: By what ...
2
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1answer
161 views

Increasing the efficiency of solar cell systems

As far as I know, there are currently two main approaches to utilising solar radiation for maximum energy conversion to electricity. These are either direct conversion to electricity, using ...
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1answer
22 views

Fabry-Perot Spectroscopy

Suppose you have a source of variable wavelength, and you are sweeping the wavelength while monitoring transmission through a Fabry-Perot cavity at normal incidence? What (qualitatively) could you ...
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19 views

Rayleigh length determination for Laguerre-Gaussian Modes

Recently I have measured the Rayleigh length of a Gaussian electron beam probe in a scanning electron microscope, using the function: $$w(z) = w_0 \times \sqrt{1 + (z/z_r)^2}$$ Where $w$ is beam ...
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23 views

Effects of Lens Changes on Geometric Optics [closed]

What is the effect of changing curvature of a lens on the location of the projected image?
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37 views

Time that we have changing color [closed]

I have a question but I don't know the answers and the book or sth else for answering to it : Please help me and tell me anything When do we have a color changing in clothes when they get wet?
2
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0answers
15 views

How to calculate the focal length of spherical shell (zero meniscus lens)

I can get my head around the optics of a spherical shell (a meniscus lens that neither diverge nor converge, being neither positive nor negative etc). I don’t see how I can describe in a formula how ...
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0answers
15 views

Phase change by reflection [duplicate]

Let's consider a light ray falling on a cuboid made of glass at the angle $\alpha$. Then there will be a reflected ray $A$. The ray will also refract. Let the refracted ray be $B$. Ray $B$ will be ...
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19 views

Determining the focal length of a gradient index lens

There are three subquestions in this question, all marked bold. Let's consider a planoconvex gradient index lens of thickness $d$, radius $R$ whose refractive index changes with the distance from ...
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1answer
32 views

image transmission through waveguides

in general optics we study the transmission of image information through lenses, basically governed by Fourier optics laws. how can images be transmitted through waveguides at smaller propagation ...
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1answer
25 views

Calculating the beating length of the directional coupler

I want to determine the coupling length needed to achieve a certain power coupling coefficient of a directional coupler. Recently, I read a paper titled "Ultra-compact high order ring resonator ...
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1answer
53 views

Why do snorkelers not need to wear corrective glasses when snorkeling with goggles on?

I am myopic ~ -2.75 sph +1cyl. When I went snorkeling they tell you not to wear glasses behind the goggles. Surprisingly, underwater, things remain in focus with goggles on even without prescription ...
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2answers
111 views

Determining the refractive index of a foil

(59th Polish Olympiad in Physics, final stage, experimental part, 2010) You have at your disposal: a sample of blue foil of a homogeneous material, placed between two glass panes in a ...
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21 views

What will my diamond fibre shirt look like?

So, during an idle moment when I mused that our experimental setup would be a lot less hassle if it was made from a 1kg single crystal of diamond, this thought occurred to me... Since single crystal ...
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21 views

What is the “Obscuration Factor (OBF)”?

In a paper I am reading for my master thesis I came across this "obscuration factor (OBF)". The authors indicate that it is a measurement of the average intensity of reflection. They do not give a ...
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1answer
17 views

Design process of directional coupler

I know that when two wavegudies are brought sufficiently close enough, the electromagnetic fields overlap and light can be coupled from one waveguide to the other. However, how to calculate the ...
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3answers
100 views

Why is there a negative sign in front of the optical wave?

In undergrad I lost (a lot) of marks in my optics class for writing: $$A(t) = \exp(i(\omega t + \phi))$$ Instead of: $$A(t) = \exp(i(-\omega t + \phi))$$ In a derivation where I must have needed ...
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1answer
54 views

Optics Cornu spiral diffraction [closed]

I am in second year of university and doing optics. I have a questions in one of my assignment: Fresnel diffraction is observed behind a wire 0.37 mm thick, which is placed 2 m from the light ...
4
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1answer
36 views

Interference and windows

The other day i was learning about interference patterns with the effect of a bubble making a rainbow on the surface. I learned that the reflections from both sides of the soap can interfere ...
0
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1answer
21 views

What's the difference between on-axis and peak intensity for a Gaussian beam?

I am asked to find the ratio of the on axis intensity at z=zR (Rayleigh range) to the peak intensity, given that the Gaussian beam solution is: ε(ρ,z) = ε0 (ω0 / ω) exp(ikρ^2 / 2R) exp(-ρ^2 / ω^2) ...
0
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1answer
23 views

Path length requirement for diffraction problem [closed]

The following question has been asked in a problem sheet I have been asked to answer: "The above diagram relates to the path lengths of radiation, with an angle of incidence, θ, reflecting off ...
2
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2answers
34 views

Color of objects in Yellow sun

The sun appears yellow but the objects on the earth appear as if they have been illuminated in white light. Are all objects that we see in sunlight actually in a yellow shade, and would appear ...
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1answer
33 views

Could satellites achieve orbit using current laser technology

My question is, could we, using current laser technology sufficiently scaled up, launch a lightweight, say a GPS navigation satellite, into earth orbit? The main objection to me is maintaining the ...
1
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1answer
28 views

Florescents and radio waves

Okay so if you put a florescent light bulb in front of a certain radio, the radio waves excite the mercury inside a causes them to emit UV light which makes the outer coating of the light bulb light ...
2
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2answers
31 views

Compact Disc Optics - Why use a linear polariser and a quarter wave plate?

I just came across this website about the application of a quarter wave plate. Link: Compact Disc Optics. My question is why does the beam need to be linearly and then circularly polarised before ...
2
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42 views

A lens with a variable refractive index

(60th Polish Olympiad in Physics) A planoconvex lens of radius of curvature $R$ and thickness $d$ (on the optical axis) is made of a material, whose refractive index changes with the distance from ...