What is Coherent: Definition and 166 Discussions

Coherent is a clone of the Unix operating system for IBM PC compatibles and other microcomputers, developed and sold by the now-defunct Mark Williams Company (MWC). Historically, the operating system was a proprietary product, but it became open source in 2015, released under the BSD-3-Clause license.

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  1. M

    Understanding Coherent Length & Interference Effects

    What is coherent length? and how it is affected interference
  2. C

    Duration of wave packet (photon) vs coherent time

    hi, can anyone kindly explain to me what's 'coherent time' and 'duration of wave packet (photon)' in white light interference ?
  3. C

    Coherent time vs duration time of the wave packet (photon)

    hi, i really confused about this two term. As i read from a book, ' in the Young's double slits experiment of light, if the time difference (that resulted from the path difference because of the two slits) is longer than the duration of each 'burst' (the photon),the received waves must come...
  4. N

    Exploring Coherent States in the Quantum Oscillator

    i've just encountered coherent states while studying the quantum oscillator, and I'm trying to understand some of the semiclassical properties of them. can someone give me a brief description of what they represent in the system and of how they vary in time?
  5. 2

    Coherent scattering in BCS semicon?

    Hello experts, I've had some fun reading the posts in the various forums, and now it's time for me to ask a question. Is it possible to scatter light off of a BCS semiconductor such that the light can be considered to scatter from the coherent state of many Cooper pairs, rather than just...
  6. P

    Coherent State: What Does Re Mean?

    Coherent state... "Re"? So we're talking about coherent state of harmonic oscillator... and for |psi(x,t)|^2, we came up with an equation... that has a term with "Re" in it. Does anyone know what I'm talking about or should I type up the whole equation? What does the "Re" mean?>?>
  7. D

    Monochromatic and Coherent light

    How can the same source of monochromatic light produce 2 waves that are incoherent or coherent for that matter? (Is this even a valid question?) What does coherence really mean beyond the definition of "waves that have a constant phase difference" could anyone clarify this? thanks.
  8. I

    A.: Exploring Coherent States & Perfect Solutions

    I just watched the latest episode of NUMB3RS which brought up a very interesting concept called Coherent States. From what I got from the show this concept has something to do with data which contains no outliers and no anomalies, therefore pointing to a perfect solution. In the show it was...
  9. jal

    Dynamical coherent states and physical solutions of quantum cosmological bounces

    http://arxiv.org/PS_cache/gr-qc/pdf/0703/0703144.pdf Dynamical coherent states and physical solutions of quantum cosmological bounces Martin Bojowald_ 29 march 2007 I could ask a lot of question ... however, one for now What does he mean by "squeezing"? jal
  10. T

    Coherent Optical Processor [Photonics]

    In my course on Microphotonics there is a brief mention of a coherent optical processor system. My problem is I don't exactly know what it's for. Basically, what is said that a transparent input image (like a photograph) is lighted monochromatically and then focussed by a lens to a spot with...
  11. Amith2006

    Definition of coherent sources

    Sir, Coherent sources are defined as sources having same frequency and constant phase difference. In some books it is given that coherent sources have constant phase difference only. Which is correct?
  12. marcus

    Magueijo: laserweapon shortcomings (QG limit on coherent pulse energy)

    One of the funniest oneliners I've seen in a technical paper: " It is therefore impossible to have a Laser deliver more than about a GigaJoule of coherent light. The implied limitations to military systems, such as those inspired by SDI, are so tragic they shouldn’t even be contemplated. "...
  13. P

    What does coherent exactly mean?

    What does coherent exactly mean? What does same phase difference refer to? Why these two factors must be present so as to create interference? I'd think if a wave which has a half wavelength to another, same speed. the phenomenon can be observed clearly too.
  14. S

    How does extreme cold weather affect speech and coherence?

    Hi. I recently went paintballing in muddy and snowy conditions (at the same time). I found a really curious thing happened to me. My words would get stuck in my mouth more often, I'd make pronuciation errors and I'd generally mess up words. For example, when I wanted to say: "Let's go!"...
  15. A

    FEMTOCHEMISTRY (Preparation of coherent state superpositions)

    Greetings, I´m taking contact with femtochemistry. As you know, the goal of this area is the real time following of the molecular dinamics, providing the first real experimental data from transition states, resonances, mechanisms of energy redistribution.. and so on. The key to study...
  16. M

    Is it possible to make the quantum coherent?

    It just crossed my mind, some weird idea I've got. There's a great deal of chance and probability involved in quantum physics, I was thinking is it possible to make particles, instead of making it most likely to have a particular momentum or position, why not make it more "classical", as in a...
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