What is Laser beam: Definition and 129 Discussions

"Laser Beam" (レーザービーム, "Laser Beam") is a song recorded by the Japanese girl group Perfume for their third studio album, JPN (2011). It was written, composed, arranged, and produced by Japanese musician and Capsule member Yasutaka Nakata. The single also included the A-side track "Kasuka na Kaori", which appeared on the parent album. Originally scheduled for an April 20, 2011 release, it was postponed due to the 2011 Tōhoku earthquake and tsunami disaster. As a result, they both premiered on May 18, 2011 as the fourth single from the album in Japan. Musically, "Laser Beam" is an electronic song, influenced by 8-bit music.
Upon its release, the track garnered positive reviews from music critics. Some critics highlighted the song as one of Perfume's best singles from their album, and commended the composition. It was also successful in Japan, peaking at number two on the Oricon Singles Chart and Billboard's Japan Hot 100 chart. It was certified gold by the Recording Industry Association of Japan (RIAJ) for physical shipments of 100,000 units. An accompanying music video was shot by Kazuaki Seki; it features the girls performing the song in a futuristic labyrinth, trying to retrieve a suitcase by a mysterious man. It was performed on the group's 2011 JPN concert tour.

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  1. J

    Momentum attained by a laser beam

    A small spaceship, with a mass of 1500 kg (including occupants), is at rest in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 10kW laser beam that points out of the ship into the deep of space, what speed will the ship attain in 1 day because of the...
  2. S

    Exploring the Characteristics of a Laser Beam

    Homework Statement An argon laser emits 1 watt of continuous light (λ= 5.145 x 10-7 m) in a parallel beam of 2 mm diameter in vacuum. Homework Equations (a) What is the wavelength, frequency, period, wave number, velocity, intensity, and amplitude of the electric field of the laser...
  3. K

    Momentum: laser beam and photons

    Homework Statement A rubidium atom traveling at the speed of sound absorbs photons from an oncoming laser beam Each photon can be viewed as a tiny ping pong ball having momentum 7.79 x 10-28 Nt/sec. The atom absorbs a photon which is then reradiated in any direction. Hence, on average each...
  4. G

    Magnetic field detectable around axis of laser beam?

    I've looked for this subject but perhaps I'm asking the question the wrong way. Please advise. Is there an extension of magnetic field (flux) beyond the beam axis of a laser? In other words, can one detect (or has anypone attempted to detect) the magnetic field around the a light beam in a...
  5. S

    Efficient Laser Beam Expansion Techniques for Optimal Illumination

    For my experiment I need to take a 0.8 mm HeNe beam to 20 mm beam. Since we just want illumination, it appears there is not need for beam expander or a setup of special lens (there are a few configurations online). It was suggest to use a Plano-convex cylindrical lens. I talked to...
  6. J

    A 200 mW horizontally polarized laser beam

    Homework Statement A 200 mW horizontally polarized laser beam passes through a polarizing filter whose axis is 25 degrees from vertical. What is the power of the laser beam as it emerges from the filter? P=mW Homework Equations E (transmitted) = E (incident)cos() The Attempt at a...
  7. GRB 080319B

    Laser Beam Destructive Interference

    If two lasers are pointed emitting end to emitting end in a vacuum (for lowest divergence), and emit 2 beams of light 180 out of phase, could both beams destructively interfere completely (no light coming from either emitting end after the beams converge)? If the experiment was done under...
  8. F

    Laser Beam Uncertainty: Exploring Effects of Aperture

    hello forum. a question about light and uncertainty: If a laser beam has a 2 cm diameter when it passes through an aperture that is 6 cm wide, the beam is not affected by the aperture. Why? What happens to the uncertainty principle there? Isn't the probability wavefunction affected by...
  9. T

    Does ball pen emit laser beam?

    Hi all, I would like to ask a question. Some people tell me that the red light emitted from the ball pen (I don't know the exact word in English, I mean the pen that lecturer uses to focus light on the slides when conducting presentation, in Power point eg) is the laser light. Is it true...
  10. S

    Rotating a laser beam faster than light?

    This is probably just nuts but let's say you switch on a laser, point it to the sky and leave it on for billions of years until the beam has traveled billions of light years. Then you rotate the laser 360 degrees in let's say 1 RPM. Does the laser spot that is now billions of light years away...
  11. A

    Maximizing Disc Storage: The Impact of Laser Beam Width on Information Capacity

    Information is stored in a series of pits on the disc. These pits are scanned by a laser beam. An significant limitation on amount of information that can be stored on a disc is width of laser beam. I knew why the width of laser beam is important coz diffraction effect of loght. But, i...
  12. B

    Calculating Angle Deflection in Laser-Mirror Interactions

    Mirror and laser beam angle...please help! Homework Statement The mirror deflects a horizontal laser beam by θ=59°. What is the angle φ? Homework Equations The Attempt at a Solution I don't understand this. How am I supposed to figure out φ?
  13. T

    Calculating Intensity of 20-W Laser Beam After 10,000 m Travel

    Homework Statement If a 20-W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the final intensity of the beam? A. 20 x 10-4 W/m2 B. 20 x 10-6 W/m2 C. 20 x 10-8 W/m2 D. 6.4 W/m2 E. 6.4 x 10-6 W/m2 Homework...
  14. S

    Calculating Focal Length and Minimum Diameter for Laser Beam Diffraction

    Homework Statement A scientist needs to focus a helium-neon laser beam (lamda = 633nm) to a 10 micrometre diameter spot 8.0 cm behind the lens. a) What focal-length should she use? b) What minimum diameter should she use? Homework Equations w = (2.44lambda * focal length) /...
  15. S

    Calculating Trip Time for Laser Beam to Moon and Back

    Homework Statement How long would it take a laser beam to go to the Moon and back if the distance to the Moon is 3.8 x 10^8m? Homework Equations a=2d/t^2 d=v1 t + 1/2a t^2 The Attempt at a Solution a=2d/t^2 9.8m/s(Gravity)=2(7.6x10^8)/t^2 t^2=15.2x10^8/9.8 t= 12453.99698 secs...
  16. I

    Laser beam spreader optics problem

    Homework Statement Two positive lens are to be used as a laserbeam expander. An axial 1mm diameter beam enteres a short focal length positive lens, which is followed by a somewhat longer focal length positive lens from which it emerges with a diameter of 8mm. Given that that first lens has a...
  17. M

    Calculating Force Exerted by Laser Beam on a Mirror

    Homework Statement A laser beam (\mathrm{Power} = 1\ \mathrm{W}) is completely reflected by a mirror perpendicular to the beam. Light is made of photons, and each photon carries an energy E = h\nu and a momentum P = h/\lambda, where \nu is the frequency, \lambda is the wavelength and h is...
  18. M

    Calculating Wavelength of Laser Beam using Single Slit

    A laser beam passes through a single slit of width 0.0186 mm and produces a pattern with an intensity distribution like that shown in Figure 13a (page 208), on a screen 105.6 cm away. If the spacing between the minima on either side of the central maximum is 7.16 cm (in other words, 2y1 in...
  19. D

    Stationary particle in a laser beam

    Homework Statement A stationary particle of charge q = 3.0 10-8 C is placed in a laser beam whose intensity is 2.5 103 W/m2. (a) Determine the magnitude of the electric force exerted on the charge. (b) Determine the magnitude of the magnetic force exerted on the charge...
  20. T

    Control direction of laser beam

    Hey all, I am currently trying to figure out how I can control the direction of a laser beam. Galvos are widely used in order to electronically change the direction of the beam. Although, I was hoping to find a way to do this without mechanical parts. There are two ways I have looked at...
  21. Integral

    Green Laser Beam: 10W Power & 1064nm | Home.comcast.net

    A few months back there was a thread with a pic of a visible beam being emitted by a green laser pointer. There was some discussion as to whether or not it was a photochop. Here is a pic I took of "my" green beam laser. I am not at liberty to say a lot about this laser, but it is 1064nm and on...
  22. S

    Refraction of Light in a laser beam

    Question A laser beam travels from air into a symmetrical prism at right angles close to its upper edge. The refractive index of the prism material n = 1.4 and its angle is 30 degrees. i) Calculate the critical angle for the prism-air interface. Possible Answer: Critical angle =...
  23. C

    Relativity and the Laser Beam: Is Faster-Than-Light Travel Possible?

    I saw this awhile ago, I don't remember where though. Supposdly some scientists accelereted the beam of a laser faster then the speed of light, by shooting it through a high density gas. The opinion being that Relativity only states that nothing can go faster then the speed of light in a...
  24. M

    Scientists teleported a laser beam

    A while ago a group of scientists teleported a laser beam from one area to another, proving that this is possible yes? If I remember rightly the problem with teleporting a human is that while the physical self would be transported, the mind would not be, leaving you with a physically fully...
  25. L

    Mysterious Laser Beam Dots: What Could It Be?

    An Intresting thing about laser beams that I noticed is that you always find thousands of small dots in the spot that is formed by a laser beam on the surface? What could it be? Maximas of light beams caused by constructive interferences? I am yet to find out. Please let me know if you have any...
  26. O

    Bend a Laser Beam - Learn How It's Done

    Bending a laser beam ?! I was surfing the web when I encountered this photo: http://www.ieav.cta.br/soldagem/LASER%20verde.gif I can only read English and Persian, unfortunately the page was in another language I can't get even a word of it. Anyway I'm badly interested to know a bit...
  27. S

    Velocity of Lithium Atom Powered by 1mW Laser Beam

    A lithium atom (mass doesn't matter) is being pushed from rest by a laser beam whose power is 1mW. Find the velocity of this lithium atom as a function of time So here goes what i have done v(t) = \frac{1}{2} at^2 now F = ma = \frac{\Delta p}{\Delta t} so then a = \frac{\Delta...
  28. S

    Intensity of laser beam / Inverse square law

    Hello everyone! I'm having a real tough time with this one, maybe I can get a little help. A small helium neon laser emits red visible light with a power of 3.2 mW in a beam that has a diameter of 2.5mm. What is the intensity of the laser beam? Does this intensity obey the inverse square...
  29. C

    Force exerted on mirror by laser beam

    How much force (in Newtons) is exerted on a mirror when a 12.0W laser beam of red light (675 nm) strikes the mirror normal to its surface? (Assume no light is absorbed) How how how how? kthx
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