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The standard fiber optical trap relies on the same principle as the optical trapping, but with the Gaussian laser beam delivered through an optical fiber. If one end of the optical fiber is molded into a lens-like facet, the nearly gaussian beam carried by a single mode standard fiber will be focused at some distance from the fiber tip.
The lasers needed for the magneto-optical trapping of rubidium 85: (a) & (b) show the absorption (red detuned to the dotted line) and spontaneous emission cycle, (c) & (d) are forbidden transitions, (e) shows that if the cooling laser excites an atom to the = state, it is allowed to decay to the "dark" lower hyperfine, F=2 state, which would ...
Laser power used for trapping the cell is 100 mW, for stretching 1200 mW per fibre. Phase contrast images, 63× objective; scale bar is 10 μm. The trapping of micrometre-sized particles by two laser beams was first demonstrated by Arthur Ashkin in 1970, [1] before he developed the single-beam trap now known as optical tweezers. An advantage of ...
The vacuum chamber also requires an atomic source for the atom(s) to be laser cooled. The atomic source is generally heated to produce thermal atoms that can be laser cooled. For ion trapping experiments the vacuum system must also hold the ion trap, with the appropriate electric feedthroughs for the trap.
This is the same trapping mechanism as in optical dipole traps (ODTs), with the only major difference being that the intensity of an optical lattice has a much more dramatic spatial variation than a standard ODT. [1] A 1D optical lattice is formed by two counter-propagating laser beams of the same polarization.
Optical beam dump suited for several watts of laser light. A beam dump, also known as a beam block, a beam stop, or a beam trap, is a device designed to absorb the energy of photons or other particles within an energetic beam. [1]
An optical molasses consists of 3 pairs of counter-propagating orthogonally polarized laser beams intersecting in the region where the atoms are present. The main difference between an optical molasses and a magneto-optical trap (MOT) is the absence of magnetic field in the former. Unlike a MOT, an OM provides only cooling and no trapping.
Common laser-cooling configurations include optical molasses, the magneto-optical trap, and the Zeeman slower. Atomic ions, trapped in an ion trap, can be cooled with a single laser beam as long as that beam has a component along all three motional degrees of freedom. This is in contrast to the six beams required to trap neutral atoms.
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