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  • Lasers and Collimation - Physics Stack Exchange
    Lasers are not perfectly collimated In fact, according to an analogue of the Heisenberg Uncertainty Principle, it's fundamentally impossible to create a perfectly-collimated beam of light from a finite-sized source Why? If the light is traveling in the z direction, and it's perfectly collimated, then the photon momentum in the x and y direction is exactly zero Which means the photon
  • Can the neutrons in a nuclear reactor be collimated?
    N B I am not a physicist My layman's understanding of a nuclear reactor is essentially that neutrons are doing one of 4 things at any given time in the reaction chamber: Flying freely around
  • How can a lens collimate an image instead of just a point of light?
    The HUD collimates the light from each point in the source separately, producing a separate collimated bean from each point Unlike a collimator, these beams go in different directions It thus transforms the location of a point on the source into the direction from which the light enters the eye
  • Why do we need collimated light on a diffraction grating?
    If the beam wasn't collimated then light with different wavelengths but from different parts of the source, arriving at different incidence angles, would be diffracted in the same direction This would spoil your wavelength discrimination, contradicting the whole purpose of a diffraction grating
  • electromagnetism - A difference between Plane Wave and Collimated . . .
    However, if the intensity differentials are accounted for than assuming a small plane wave or collimated vectors will produce an exact mathematically and experimentally verifiable result Thus, multiple texts and sources will unexpectedly state that the momentary wave at such a position is collimated or a plane-wave front
  • Perceived visual size of collimated image - Physics Stack Exchange
    Knowing the size (d) of the final collimated beam focused at infinity, how can I determine the perceived visual size of the beam? Such as in terms of being equivalent to an object of a certain size at a certain distance from the eye, or alternatively in terms of field of view
  • What type of lens is used to collimate light? - Physics Stack Exchange
    The emission from the active part of the LED is a divergent beam You must focus it, in order to get a collimated beam So you need a convex lens Since the beam is (usually) strongly divergent, I suggest a lens with wide numerical aperture, i e the ratio between the focal lenght and the diameter should be betwen 1 and 3
  • Focusing and collimating laser light on a table top scale
    I am looking for a summary of practical methods of focusing and collimating laser light, which I guess are contradictory objectives, or are they? For example, when I use typical small diode lasers
  • optics - Why cant incoherent light be collimated as well as laser . . .
    But this also makes the complete device a much larger light source, so collimation of the light it produces is considerably harder The lasers, on the other hand, are used directly as bare crystals behind the collimating lens, so they look much like point light sources, which can easily be collimated
  • Is there any incoherent collimated monocromatic light source?
    Or any device to transform a collimated laser into an incoherent collimated light source To my understanding, I can maintain the coherence even if the laser is not collimated, an incoherent collimated light source would be composed of photons with different phase shifts but collimated





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