Understanding Coherence in Laser Light Emission - Physics Forums
Jan 17, 2010 · A laser needs inversion in order to prevent stimulated absorption, but it is not necessarily a precondition for a buildup of coherence - for example coherent outcoupling from condensates or the so-called lasers without inversion, where reabsorption is forbidden by means of destructive interference can produce coherent light, too.
Coherent state of photons in a laser - Physics Forums
Oct 30, 2012 · A coherent state of photons in a laser is created by stimulating a population of atoms or molecules to emit photons in the same direction and with the same frequency and phase. This can be achieved through processes such as population inversion, where more atoms or molecules are in the excited state than in the ground state.
Understanding the Inverse Square Law for Laser/Coherent Light
Jan 19, 2004 · The Inverse Square Law for Laser/Coherent Light is a physical law that states that the intensity of light from a point source is inversely proportional to the square of the distance from the source. How does the Inverse Square Law affect the brightness of a laser beam?
Exploring Coherent States in Quantum Mechanics: From Lasers to …
Mar 13, 2014 · So a coherent state in quantum mechanics is "the most classical" quantum state (A Gaussian wave packet), which satisfies the Heisenberg uncertainty relation with an equality. This allows the wave packet to travel in space in a more localized fashion (like …
What is the Difference Between Coherent and Incoherent Light?
Jan 23, 2013 · A laser is a common source of coherent light. The light waves in a laser are all aligned and travel in the same direction, resulting in a narrow beam of light with a consistent wavelength and phase. What is the importance of coherent light in scientific research? Coherent light is essential in many experiments and technologies, such as ...
Questions on Electron Orbitals, Wave Packets, and Coherent States
Apr 6, 2008 · 1. A weak IR-frequency laser is shown on a cloud of atoms. This causes the electrons to "wiggle" back and forth in the direction of the laser's E-field at at the laser's frequency, but is not enough to ionize the atoms or excite the atoms to higher states. 2. A train of evenly-spaced XUV attosecond laser pulses are directed at the cloud of ...
The length of laser's optical cavity. Multiple of wavelength?
Feb 24, 2008 · This ensures that the waves within the cavity are in phase and can produce a strong, coherent laser beam. 4. How does the length of a laser's optical cavity affect the laser's output? The length of a laser's optical cavity can affect the laser's output in several ways. It can determine the laser's mode structure, which impacts the beam size and ...
Non-Coherent Light Diffraction through Double Slit - Physics Forums
May 29, 2011 · The main difference between non-coherent light diffraction and coherent light diffraction is the visibility of the interference pattern. Coherent light produces a clear and distinct pattern, while non-coherent light produces a less visible and often blurred pattern due to the random phase differences of the light waves.
Combine lasers to make a single strong beam - Physics Forums
Jul 10, 2011 · If you want to combine a lot of tiny lasers into one giant laser beam (i.e. coherent addition), you can't, by thermodynamic arguments. If you simply want to dump a lot of power into a small volume using lots of little lasers (incoherent addition), you can (as Drakkith mentioned).
Understanding Coherent Waves: Frequency and Phase Differences …
Jul 15, 2011 · Some examples of coherent waves include laser light, sound waves in a musical instrument, and waves on the surface of a pond caused by a single source. How are coherent waves used in practical applications? Coherent waves are used in various technologies, such as in optical communication systems, holography, and medical imaging.