Kapitza dirac pulse. .



Kapitza dirac pulse. We find that for sufficiently weak pulses, the usual analytical short-pulse prediction for the Raman-Nath regime contin-ues to hold for longer times, albeit with a reduction of the apparent modu-lation depth of the Here, we extended the Kapitza-Dirac effect to the time domain. A first Kapitza-Dirac pulse creates several spatially addressable modes which are coherently recombined by the harmonic potential and mixed again by a second Kapitza-Dirac pulse. The mean scattering angle and the distribution function of the electrons after scattering are found. Jul 7, 2014 · We design a multimode interferometer with cold atoms confined in a harmonic trap. By tracking the spatiotemporal evolution of a pulsed electron wave packet diffracted by a 60-femtosecond (where one femtosecond = 10 -15 seconds) standing wave pulse in a pump-probe scheme, we observed time-dependent diffraction patterns. Mar 28, 2024 · Similar to the optical diffraction of light passing through a material grating, the Kapitza-Dirac effect occurs when an electron is diffracted by a standing light wave. The electron and the light grating interact ex-tremely weakly, via the ‘ponderomotive potential’5, so attempts to measure the Kapitza-Dirac effect had to wait for the development of the laser. Abstract: We study Kapitza-Dirac diffraction of a Bose-Einstein con-densate from a standing light wave for a square pulse with variable pulse length but constant pulse area. Sep 13, 2001 · Here we report the diffraction of free electrons from a standing light wave—a realization of the Kapitza–Dirac effect as originally proposed. The effect was first predicted as the diffraction of electrons from a standing wave of light by Paul Dirac and Pyotr Kapitsa (or Peter Kapitza) in 1933. [1] The effect relies on the wave–particle duality of matter as stated by the de Broglie hypothesis in 1924. . By tracking the spatiotemporal evolution of a pulsed electron wave packet diffracted by a 60-femtosecond (where one femtosecond = 10−15 seconds) standing wave pulse in a pump-probe scheme, we observed time-dependent diffraction patterns. Mar 29, 2024 · Here, we extended the Kapitza-Dirac effect to the time domain. A phase shift among the mode is estimated by fitting the density profile or by measuring the number of atoms in each output mode. The data clearly show diffraction peaks of the atomic momentum transfer at even multiples of the photon momentum. Predicted by Pyotr Kapitza and Paul Dirac in 1933, it experimentally confirms the wave nature of particles. Feb 24, 1986 · We have observed the Kapitza-Dirac effect in the scattering of sodium atoms by a nearly resonant standing-wave laser field. Jul 22, 2025 · Kapitza-Dirac scattering refers to the diffraction of matter waves (electrons, atoms, or molecules) by a standing wave of light, analogous to X-ray diffraction in crystals. Now, the Chinese-German team has successfully observed the phase evolution of electrons by capturing the diffraction patterns produced by passing an electron pulse through a standing light wave This Kapitza-Dirac effect is analogous to the diffraction of light by a grating, but with the roles of the wave and matter reversed. One-Sentence Summary: Harnessing the time-resolved Kapitza-Dirac effect allows for the retrieval of the phase of a free electron wave packet. The Apr 19, 1999 · The scattering of electrons on a standing electromagnetic wave ~the Kapitza–Dirac effect ! is considered within the quantum-mechanical and classical descriptions of the motion of electrons. It is shown that assignment of the initial electronic wave function in the form of a plane wave in the Apr 3, 2020 · This is implemented by applying a short lattice pulse on BEC in the Kapitza-Dirac (or Raman-Nath) regime, which, in the classical picture, corresponds to phase modulation imprinted on matter wave. ejf26 vz7d0u g0bq pe6ghg 3h xrv s7d thnml tut5 edtd