Optical Definition and 640 Threads

Hello,I have a question about 2 (or more) atoms coupled to an optical cavity. The equations of motion in the interaction picture for 2 atoms in resonnance with an optical cavity starting from 1 excited atom (C_{eg,0}(t_0) = 1 ) (g is the coupling constant) \begin{cases} \dot{C}_{eg,0} &= -...

I am trying to simulate a Gaussian beam through an optical waveguide having a circular cross-section in matlab. I am familiar with the theory of modes in an optical fiber and can analytically calculate the evolution of the beam by breaking down the beam into a sum of infinite modes. However, I...

I am looking around for some sort of equation regarding optical power dissipation of light (ultraviolet light in particular) in the atmosphere but i cannot find anything. I know that UV light obeys Rayleigh scattering but I don't know much else. I'm trying to figure out for example, if I shined...

I have been working with equations throughout the semester and using them to find cutoff frequencies and such, but when you say something like TE10, TE20, TE21, etc., I am realizing that I am having trouble getting a physical idea of what exactly these things are. Of course if you transmit at a...

I read that Jones matrices can descibe optical devices with polarized light. They are 2 by 2 matrices.A basis can be Linear polarization along x or along y for a photon moving along z. I can use when there is a device with one input channel. Consider now a Mach Zehnder Interferometer (MZI)...

A couple of questions about this paper, which, unfortunately, I can't access in is entirety http://link.springer.com/article/10.1007%2FBF02923262#page-1 1) Re: optical coordinates. From what I've read (here and some other sketchy sources), these are similar to fermi-normal coordinates, but...

I was recently looking in lasers and and their uses and while watching Cosmos with Newton using a prism to shows the different colors of light from white light i got thinking. I stumbled onto the top optical or photonic computers a while ago and I decided to look into building one. After...

Hi Every one, I measured optical output power from both laser facets, front facets emits 120 mW and back facets 10 mW. Assuming front facets reflectivity of 30%(for cleaved facets). What will be the reflective of back facets? Please suggest formula and reference this problem.

How many reflections will be made by a light entering a 2m long optical fibre cable. If the angle of incidence with the axis of the core is 3.43° . Given that the core diameter and refractive index are 60μm and 1.48 respectively I got the answer as 36368.48 is this correct? L=2m...

Some of you may have see the pinhole method of seeing without having to use glasses. My question is this, could this same pinhole application of viewing clearly be useful in optical microscopes? And if so, can it be used in series? By my understanding the pinhole technique works by...

Dear friends, I wish know what is/are the chemical elements commonly used for build filter lens applied on moderns night vision cameras. Thanks in advance. +++

Hey I just have a kind of broad question, typical derivations of the optical trapping force involve the approximation that the particle is spherical. I'm about to start looking into papers which discuss deviations from this but before I do I just wanted to see if I could reinforce some...

Homework Statement In optics, the following expression needs to be evaluated in calculating the intensity of light transmitted through a film after multiple reflections at the surfaces of the film: {\sum _{ n=0 }^{ \infty }{ { r }^{ 2n } } cos\quad n\theta })^{ 2 }+{ \sum _{ n=0 }^{ \infty...

In wikipedia, it said for optical fiber, a loss that takes place at discontinuities of refractive index, especially at an air-glass interface such as a fiber endface. At those interfaces, a fraction of the optical signal is reflected back toward the source. But what I learned in tranmission...

hello, reading about the theoretical background of optical trapping. I was wondering how the scattering force originates. Often it is written, that the scattering force is due to reflection, but also the central rays refracted by a dielectric object should contribute ? So the scattering force...

I'm an undergrad at IPFW and I just got on this project setting up an optical trap. Our (my professors) main goal is to find out at what intensity (he keeps saying temperature) of light the objects behave as free particles. I see where this could be of interest, but aren't there bigger things...

I have been looking at a few universities I plan on attending and I have noticed some offer an "optical engineering" major. This was a bit intriguing, and reading descriptions and some of the classes that these majors take interested me a bit. Who here has experience in actual optical...

Homework Statement Explain the physical principle of total internal reflection used by optical cables. Calculate the critical angle of incidence that corresponds to a refracted angle θair = 90 Next, calculate the critical angle for a bare glass fiber submerged in water nH2O = 1.33...

I need to know about optical switch for my optoelectronics course for physics majors. So far I only know its a switch which is controlled by light. I tried to search net but couldn't find any thing. Is optical switch have another name?

Hello. I played with my new, first ipad yesterday. I inverted sceen colors and activated the cam. How comes there is an image of me reflected in my eyes with NORMAL colors?

Question on my study guide: An optical systems consists of 4 lenses spaced apart. Each lens has a focal length f. Each lens is located a distance "z" away from each plane as shown. The total length of the system is 8z. Find the distance z needed to satisfy a FOURIER TRANSFORM condition...

Homework Statement derive the angle of limitation sinθ=[(n2^2-n3^2)^1/2]/n1 n1 is the air out side of the fibre n2 is inside of the fibre n3 is the fibre wall Homework Equations Snells Law: n1sinθ1=n2sinθ2 The Attempt at a Solution I'm pretty stuck and don't really know...

Hi everyone, Sorry this is probably a really dull question but I'm intrigued nonetheless. I use a microscope that has multiple visible light lasers for excitation. The incident light is fed to the microscope through optical fibers. There is a single mode and a multimode fiber. I have been...

Hi all I was just wondering if anyone could help me with estimating error caused by misalignment of an optical arrangement. I am interested in how the focal length of this arrangement will be affected by say a misalignment of just one of the lenses. I'll assume that every component is aligned...

Hi all, I have a question about the "missing cone" problem in wide-field microscopy. The Fourier equivalent of the PSF is the OTF. The OTF has a toroidal (doughnut) shape. I'm a little confused by how to interpret the OTF support in the Z dimension. In 2D and considering lateral...

During studying the telecom underground cable network I came across the Optical Fiber Cable having the 144 fibers (single mode). I want to know why 144? Is this a Some standard to have 144 fibers in one cable? I have also viewed some of the datasheet having 144 fibers Optical Fiber Cable...

Homework Statement Let's consider a Tokamak with major radius R=1m and minor radius a=0.3m, magnetic field B=5T with a deuterium plasma with central density 10^{20}m^{-3}, central temperature 1keV and parabolic temperature and density profiles \propto (1-r^2/a^2) a) Find the electronic...

Hello everyone I need some one once and for all to give me the steps to have a clear step by step idea about the stimulated Brillouin scattering inside an optical fiber please and thank you

"Optical activity is the tendency of chiral molecules to rotate ppl" how does a chiral molecule rotate light? Is it because of interaction of electric fields? Anyone please help me? I just need to know how a molecule physically does that?

Hi, I am looking into some simulations of rib waveguide structures using Finite Element Method. I particularly solving modes for a 2D cross section of the optical waveguide, looking at TE and TM modes. My questions is about modes called "degenerate" and "hybrid" modes. I haven't found...

Hello all, I've been trying to come up with an optical design to basically form images onto a sheet positioned near the ground, in an old camera-obscura fashion. Hopefully this image helps to visualize. http://www.pinholeblender.com/COimages/mirror.gif I know that I will require a 45...

Homework Statement a) Despite the diverging lens with focal length f we observed object which is perpendicular to the optical axis (Figure 6 in the article ,,5. Rozptylka a zrcátko"). To what distance from the diverging lens we have to put the subject to be scaled twice? (cross-magnification Z...

On the book "Introduction to Solid State Physics" by Kittel, on page 98 he derived the roots for optical and acoustical branches for the equation: M_1 M_2 \omega^4-2C(M_1+M_2)\omega^2+2C^2(1-cos(Ka))=0 where the roots are: \omega^2=2C(\frac{1}{M_1}+\frac{1}{M_2}) and...

A tube having an inside diameter of 2 microns is one centimeter in length. A photon entering the tube will reach the sensor on other end only if its wavelength is not greater than 2 microns and the direction of its travel is does not cause it to be absorbed by the inner walls of the tube. I...

Hey, so I am trying to figure out the optical path length change of an optical fiber due to absorption. I'll post what I have so far and let me know if I have done anything wrong or if you have suggestions. so the optical path length is L' = nL (L' is optical path length, n is refractive...

what could be the attenuation for optical fiber used in fiber Bragg grating sensor with a operating wavelength of around 1550nm

Dear all, I am going to realize an experimental optical setup and I need your suggestions to make the correct selection of lenses. A polychromatic light beam coming from a monochromator (400-700, slit dimension: 1 mm, cone angle 11°) has to be focused onto the base of a cylindrical lens. I...

We work on optical simulation where we use not ideal beam expander. Not ideal means that for beam expander designed for single mode (M^2=1), the output beam has M^2 >1 (M^2 = M squared) In our system we want to use beam expander with multimode laser beam. The beam expander is not ideal (for...

Hi guys, I have to calculate de optical power output of a set of LEDs. For that I used a photodiode to measure the photocurrent at each wavelength and then calculate the optical power at each wavelength using the following formula: R (A/W) = I/P, where R is the responsivity of the...

It is mentioned that in optical tweezers the dielectric particles are attracted to the gradient of the laser's electric field. Is this mechanism the same as the ponderomotive force? If so, why is this connection not made directly? Thanks

SOme one help me with the OPD. How is here the OPD=n2(AB + BC) -n1(AD)? I am not confused with the introduction of 'n'..Rather the path length is confusing me..Why is there a negative sign?

Hi, I am a 17 year old college student from the UK carrying out an experiment to build a polarimeter to determine the specific rotation of sugars. However, I have a problem when I shine polarised light through my sucrose solution and turn the analyser polariser filter I see colours ranging...

Hi, I'm interested in doing small projects for curiosity. I'm designing an optical structure as shown below. Please tell me what kind of lenses (concave, convex, plano concave etc.. ) to be used at different points of the structure.

Difference between Optical and Geometrical length!? I'm having this question since 2 times now in the theoretical part of the exam & still I couldn't find anything about it in the book neither in google. Can anyone who's more experienced in Optical Physics give me the answer to this please !?

Hi, I recently did a experiment in which I measured the intensity of light out of a optical filter at different angles of incidence. The optical filter was designed such that only light of wavelength 405 nm is transmitted. The wavelength of incident light (the laser I used) was 402 nm. My...

Basically phonons in crystals can either be acoustic or optical according to my book. But then it stresses that a necessary condition for this to hold is that the crystal has more than atom per primitive basis. The optical modes are then when neighbouring atoms oscillate out of phase (i.e. no...

My book considers waves in crystals. Especially it develops the idea of acoustical and optical branches of the waves. From what I can see these are different ways the dispersion of our phonon may look like. It is developed when the crystal contains more than one atom per unit cell, but I am not...

Homework Statement A 2 cm tall object is 20 cm to the left of a lens with a focal length of 10 cm. A second lens with a focal length of 15 cm is 30 cm to the right of the first lens. Calculate the image position and height. Compare with ray-tracing. Homework Equations 1/f = 1/do + 1/di, m =...

Hi all I would like some ideas and pointers on how you think that I could drive my electromagnet to turn on/off with some form of optical sensor. I’m using a 12V 3.6A battery. I’m not too knowledgeable in the optical sensor arena. So if you have any ideas on how I could drive this inductive load...

Homework Statement Is this compound optically active or inactive?? Homework Equations The Attempt at a Solution This compound doesn't have the plane of symmetry.So according to me it should be optically inactive.is it right??