Optical Definition and 640 Threads

Hello, I am wondering... If you have two ethylenediamines (en) oriented in a cis en-en fashion, will they always have an optical isomer? I have not found a case yet where they do, and it would probably save time to assume optically active in an environment presseed for time (such as on a...

First, I hope this is posted in the correct section, and I'm sorry if it isn't. I am looking to create diagrams of optical setups for a technical paper. My mentor recommended using Microsoft PowerPoint, but my diagrams don't compare to those in published papers. Is there a better program...

What is the effect of using other than 1550nm light with an (LiNbO3, lithium niobate) electro-optic Mach-Zehnder modulator? Thanks!

Hi all, I just joined this Forum to get an answer to a question really, it's not for Collage or Uni or anything just a curiosity really. Mathematics isn't one of my strong points and I hope this is in the right section. What I'd like to know is... If an Object is 3 miles away, and this is what...

Hi, fellow physics friends! I'm doing a small interior decoration project in which I need optical image rotation as a component. I know that this can be done (see e.g. http://www.optics.arizona.edu/optomech/papers/swift%201972.pdf for a review paper). I've also seen Half-Penta Prisms sold...

Hi, I'm attending a 50+ Liberal Art college in physics and math, double major, I'm going to be a senior this fall and want to go to graduate school. I have major GPAs 3.81, 3,73 for physics and math respectively and 3.57 overall, GRE 670+800. I also conducted research at ORNL at material...

Hi I am not sure whether the object plane overclaps focal plane in a infinity-corrected optical microscope. Thanks!

Problem with opticalmicroscopy of features near vertical sidewall of very deep trench Hi, I posted my question here: physicsforums.com/showthread.php?t=612780 but there may be more specialists here. Essentially I have a feature right next to a very deep vertical sidewall of the deep...

The starting point for special relativity is the thought experiment. These experiments generally describe two different observations of a single event, and the experiments assume that both observations are true. To be clear: the assumption is that both of the different observations of one...

Hi When introducing optical molasses, the polarization of the counter-propagating beams are never taken into account. Is it really correct that the polarization of the beams are irrelevant, when trying to reach the Doppler-limited temperature? Niles.

Whats the job market like for someone with only an undergrad B.S. in say Physics vs EE vs Optical Sci/Engineering? I'm especially intersted in optical design opportunities around North America.

Homework Statement A thin lens of focal length f is used to collimate the light emerging from two different optical fibres. When used with a first fibre of small core diameter and numerical aperture NA it acheives a diffraction limited divergence of θ1 for the collumated beam. Find the...

Hi I am trying to design a three mirror off axis telescope. The free parameters are the offset between the apertures and distance betwen the surfaces. My question is for a system with 'n' elements/surfaces (n=3 in my case) is there a relation between optical path length and focal length of...

If a surface is perceived as being white because it reflects all wavelenghts of visible electromagnetic radiation, how does this differ from a mirror surface which also reflects all impinging light? How is a mirror different from a white surface i) optically and ii) at the level of condensed...

This equation is for calculating what and how was it obtained. E=6(mg/bt3)Rs

Problem: My homework constantly refers to something called the optical path length, L - I'm not exactly sure what this is. It's in the equation below. This question is in relation to astrophysics and dust extinction in the Interstellar Medium. Relevant equations: Dust optical depth, τλ =...

Hi I have a question on AOMs used in a double pass configuration. I understand the motivation for such a setup, but what I don't quite understand is the following: During the first pass, the frequency of the incoming beam is changed from ω to ω+Ω at an angle θB. Then we send the diffracted...

Who can tell me the concept of optical lattice and quantum dot? Or give me an advice of some thesis? Thank you very much.

Hi Say I am looking at an AOM working in the Bragg regime (i.e., only a single diffracted beam). It is easy to show using Bragg's law that the frequency-shift Ω of the diffracted wave is given by \Omega = 2n\omega \frac{v}{c}\sin(\theta) Here Ω is *also* the frequency the AOM is driven with...

Hello Forum, what type of image does an afocal system produce if the object is an extended object? A real or virtual image? Any example? Say a car is located 30 meters away... Thanks fisico30

Hi When the dielectric function of a system is time-invariant, solutions of Maxwell's Equations are separable and they are usually written as (I only write the E-field) E(r, t) = E(r) \exp(-i\omega t) Now, in my book they write an optical field as E(t) = E_0\exp(-i\omega t) +...

Hi. I am going to start my MSc in a couple of months majoring in nonlinear quantum optics. I have a good basic in quantum mechanics, but have never looked at quantum optics before. My topic will be to investigate quantum properties of nonlinear optical coupler but i have problem with the...

Actually,. What is optical equivalent path.,.? Is this and optical path length are same,.,.,??

I'm looking for information about absorption of light per unit (atom, molecule, stoichiometric) in a liquid vs solid. For instance, imagine a unit cube filled with a saturated solution of, say, potassium permanganate, and shine a laser beam through it from bottom to top and measure the...

I'm figuring this belongs in quantum - sounds like a quantum effect. http://www.opticsinfobase.org/abstract.cfm?id=63756 (my emph) There's lots of papers like this ... also been in the blogosphere: Sounds like some people are claiming to have done it for real...

Dear all, I'd like to know if there is a way of reducing an image and launching it into the core of an optical fiber. By other words, I'm not interested in the spatial distribution of the light (the image itself) but I'm interested in gathering all the light coming from the scene and...

Hello everyone, I am really looking out for some literature which has reported the physics behind the occurrence of the phenomena in which two blocks of same color seems different when kept in different background. I have attached an image which depicts the query in a very evident manner...

Homework Statement A biconvex symmetrical lens is cut in two halves and placed as shown in figure. if a point object is placed in the left how many images will be formed options - (a) Two images (b) Three images Homework Equations The Attempt at a Solution As I...

Why are optical traps constructed using beads that are made of dielectric materials? What property of dielectrics is being employed here? Would a non-dielectric material still experience radiation force from photons? Thanks!

Is it possible to see twins in Si under an optical microscope?

I tried to prove that distance of image is same as the distance of object in a plane mirror. The image attached is the ray diagram. First of all, I have assumed object and image to be parallel to mirror. First I proved angle TSA = angle TSa Then I have made similar triangle TSA and...

While drawing a computer chassis I'm designing, i came across a really weird optical illusion. it only seems to work with my glasses on. i put sun glasses on and could see it move a little, but with classes if you stare at the hexagons and move your head while looking at them, everything shifts...

Hello 1- I calculate optical properties of a pure compound in framework of DFT with pseudopotential by software. I get several picks in loss function. Does only the highest , determine plasma frequency or all of them with different density of valence electrons? 2-can we conclude the...

Dear All, Many thanks for reading this query. Actually, I am having problem in measuring the mode fields of Optical fiber at the core-cladding interface analytically for modes LP01 and LP11. The modes are normally given by eq 2.165 (image attached). To my knowledge these constants A and C...

http://www.michaelbach.de/ot/ I just spent the last 45 minutes looking at some of the demonstrations on that site. Apart from sore eyes and a minor headache, I find it fascinating. Most of the demonstrations allow you to manipulate sliders to adjust different aspects of the illusion. Some...

Hi, I have been stuck on a project that I am working on. I am trying to collect light using optics from a FOV of 200x200mm at 200mm distance. I have two major problems: 1. My detector is small so I need to collimate the light (my application is not imaging so I don't worry about the...

it typically states that optical tweezers are used to manipulate dielectric particles or whatnot. Is it also possible to do the same with conducting microscopic particles? what are the limitations besides mass being not too large? obviously optical trapping can be used down to the atomic scale...

What is the purpose of using a chopper to modulate an optical source? The Wikipedia article is not that informative.

According to Faynman Lectures on physics in the chapter of geometrical vol1 ch27, the general rule for the resolution on any optical instrument is this: Two different point sources can be resolved only if one source is focused at such a point that the times for...

Hi all, I am seeking for an optical design an simulation platform. There will be splitters, combiners and mirrors with precisely adjusted angles/positions. I will input the specs and position of all the components (including the light source) and want to view the corresponding optical path...

http://www.fiberoptics4sale.com/Merchant2/fofs_img/how-optical-fiber-works.gif The refractive index of the core is higher than that of the cladding, I don't understand why!

If we take a CW laser,say, and operate a pulsed regime, will this directly effect the spectral content of the emitted light? Is there anyway that we can pulse this laser without introducing linear chirp? Thank you

I read two definitions about optical density and I'm very confused about that 1.the sluggish tendency of the atoms of a material to maintain the absorbed energy of an electromagnetic wave in the form of vibrating electrons before re-emitting it as a new electromagnetic disturbance. 2.the...

First of all, I am new to this forum and I would like to thank you for accepting me here. I am a dental student and I would like to make a set of dental-surgical loupes. The loupes are actually small Galilean telescopes-microscopes with a fixed focus at 400-500mm, Field Of View of around 6"...

I am doing a 2D COMSOL mode analysis of an optical waveguide. The mode analysis shows you the electric/magnetic field and you want to find out the power of the guided mode. How could I do this? Power is P = I*V or dE/dt with units of Joules per second. In the FEM simulation I have given...

Hi, I am looking to illuminate a quadrant photo diode using a condenser/ lens combination in a optical trap setup. I see thorlabs has a kit that has a 100x objective as a trap and a 10x objective as a condenser. Does that mean that one doesn't need to collect all the laser light scattered from a...

Hello everyone. I was thinking about length contraction in Special Relativity last night. I looked up information on the internet, and from what I understand, length contrtaction has never been measured (I'm not completely sure if I simply failed to find information to the contrary). So my...

Hi everyone, Light has a dual nature ; wave and particle. Particle part can be explained using Quantum approaches while the wave nature is described by Maxwell Equations. I am interested in light - matter interactions from wave approach which is also my thesis subject. (also I would like to...

Hello all, I'm studying classical and quantum coherence in optics and I can't understand what's the physical meaning of second order coherence. I mean, what's the fundamental difference between it and the first order one? I know they are defined differently but I can't see in which case and why...

Physics & astronomy are interests of mine (I don't understand the granular details & apologize if this is a silly question) Could it be that the increasing rate of expansion be similar to how two points on a balloon would appear to distance themselves as you fill it with air?