optical pumping process

Laser pumping - Wikipedia

Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles in the ground state or a less-excited state, population inversion is achieved.

RP Photonics Encyclopedia - optical pumping, pump light ...

In some cases, the pump absorption efficiency can be increased by arranging for multiple passes of the pump light through the gain medium. This technique is often used e.g. in thin-disk lasers. A frequently used alternative to optical pumping is electrical pumping, applied particularly to …

Optical Pumping - an overview | ScienceDirect Topics

The optical pumping process gives a nuclear polarization far above the polarization at thermal equilibrium. During the NMR experiments, each RF pulse destroys a part of this polarization, which cannot be recovered without returning the xenon to the optical pumping module. Therefore, the pulse sequences are devised to use the magnetization ...

Bulk Nuclear Polarization Enhanced at Room Temperature by ...

Under optical pumping, these zero- and double Here Iˆ and Sˆ are the nuclear and electron spin operators, quantum terms can drive the nuclei into either polarized or DES is the excited-state zero-field splitting, γN V = 2.8·104 anti-polarized states (Fig. 1b); which one of these states MHz/T and γ13 C = 10 MHz/T are the corresponding gyro ...

Excitation cross section of erbium in semiconductor ...

mined in the case of optical excitation of erbium in semicon-ductor matrix under band-to-band optical pumping. Accord-ing to experimental data the erbium excitation cross section in crystalline silicon is by several orders of magnitude higher than that for direct absorption of photons in the dielectric SiO2 and Al2O3 matrices. 2,3

Optical pumping - Wikipedia

Optical pumping is a process in which light is used to raise (or "pump") electrons from a lower energy level in an atom or molecule to a higher one. It is commonly used in laser construction, to pump the active laser medium so as to achieve population inversion. The technique was developed by 1966 Nobel Prize winner Alfred Kastler in the early ...

Optical Pumping | Article about Optical Pumping by The ...

Optical pumping. The process of causing strong deviations from thermal equilibrium populations of selected quantized states of different energy in atomic or molecular systems by the use of optical radiation (that is, light of wavelengths in or near the visible spectrum), called the pumping radiation.

Optical pumping of Rubidium - High Energy Physics

Optical pumping of Rubidium Dr. Johannes Recht and Dr. Werner Kiein Optical pumping is a process used in high frequency spectroscopy which was developed by A. Kastler. It allows the spectroscopy of atomic energy states in an energy region which is not accessible by means of direct, optical observation. Kastler was awarded the Nobel Prize

US4916712A - Optically pumped slab laser - Google Patents

H01S3/094 — Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light; H01S3/094084 — Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light with pump light recycling, i.e. with reinjection of the unused pump …

High-Efficiency Detection of a Single Quantum of Angular ...

excitation to Phas some probability of resulting in optical pumping to the shelf, and the lasers should then be oper-ated for a time such that the probability of shelving from ji is high. Rather than detect fluorescence while the pump and probe lasers are operating, one can check whether at the conclusion of the process the atom has

Optical pumping of a single hole spin in a quantum dot ...

Jan 24, 2008· To investigate the mechanisms involved in the spin pumping process, ... Bracker, A. S. et al. Optical pumping of the electronic and nuclear spin of single charge-tunable quantum dots.

Optical Pumping: Three- and Four-Level Systems

Optical Pumping: Three- and Four-Level Systems Excerpt from Field Guide to Lasers In a simple two-level system, it is not possible to obtain a population inversion with optical pumping because the system can absorb pump light (i.e., gain energy) only as long as population inversion, and thus light amplification, is not achieved.

Optical pumping | physics | Britannica.com

Optical pumping, in physics, the use of light energy to raise the atoms of a system from one energy level to another. A system may consist of atoms having a random orientation of their individual magnetic fields. When optically pumped, the atoms will undergo a realignment of individual magnetic ...

Optical Pumping of Rubidium - University of San Diego

method of optical pumping two years later and Kastler was awarded the Nobel Prize for Physics in 1966 "for the discovery and develop-ment of optical methods for studying hertzian resonances in atoms." Optical pumping is the process by which photons are used to …

Optical pump | Article about Optical pump by The Free ...

Optical pumping. The process of causing strong deviations from thermal equilibrium populations of selected quantized states of different energy in atomic or molecular systems by the use of optical radiation (that is, light of wavelengths in or near the visible spectrum), called the pumping radiation.

OPTICAL PUMPING OF RUBIDIUM - Department of Physics

The term "optical pumping" refers to a process which uses photons to redistribute the states occupied by a collection of atoms. For example, an isolated collection of atoms in the form of a gas will occupy their available energy states, at a given temperature, in a way predicted by standard statistical mechanics.

What are the types of optical pumping? - Quora

Nov 10, 2018· Optical pumping is a process in which light energy is used to excite electrons from a lower to higher energy level. It was first developed by Alfred Kastler in the early 1950s and is primarily used to pump laser medium during laser construction. It can also pump electrons that are bound with a molecule or an atom to a well-defined quantum state.

Section 2.1: Diode Pumped Lasers Overview

Optical pumping is a resonant process, the incident photon energy hn must be equal to the energy differences between the excited states and normal states. We can express optical pumping as hn + A à A *, where A is the atom at normal state, A * is the corresponding atom at excited state. So if there are lasers whose light wavelengths are within ...

Chapter 7 Lasers - MIT OpenCourseWare

occupied. By optical pumping with an intense lamp (flash lamp) or another laser one can pump a significant fraction of the atoms from the ground state with population N0 into the excited state N3 both for the three level laser operating according to scheme shown in figure 297 (a) or N4 in the case

OPTICAL PUMPING OF RUBIDIUM VAPOR Introduction A …

Optical Pumping 1 OPTICAL PUMPING OF RUBIDIUM VAPOR Introduction The process of optical pumping is a beautiful example of the interaction between light and matter. In the Advanced Lab experiment, you use circularly polarized light to pump a particular level in rubidium vapor. Then, using magnetic fields and radio-frequency excitations, you ...

Comparative study of in situ N rotational Raman ...

Comparative study of in situ N 2 rotational Raman spectroscopy methods for probing energy thermalisation processes during spin-exchange optical pumping Hayley Newton • Laura L. Walkup • Nicholas Whiting • Linda West • James Carriere • Frank Havermeyer • Lawrence Ho • Peter Morris • Boyd M. Goodson • Michael J. Barlow Received: 13 June 2013/Accepted: 12 July 2013

Spin-current-mediated rapid magnon localisation and ...

Apr 15, 2019· Spin dynamics upon femtosecond optical pumping 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 have been intensely studied during the last two decades both because of …

Conditions for excited-state Raman and absorption ...

optical pumping process, and in particular the types of calculations which have to be performed (2,ll-13) before such light-scattering experiments can be carried out. The calculations in this paper refer to the conditions for saturation population of the excited states, and a discussion is given of some experi- ...

arXiv:physics/0605234v2 [physics.atom-ph] 6 Sep 2006

process in a coordinate frame where the quantization axis lies along the light polarization (lab frame in Fig. 1). In that frame the only non-vanishing alignment component created by optical pumping with linearly polarized light is the longitudinal multipole moment mini 2,0 which can be expressed in terms of the sublevel populations pM as mini ...

OPTICAL PUMPING - pdfs.semanticscholar.org

optical pumping, a general survey of the subject seems desirable. This book contains an elementary discussion of optical pumping techniques and theory suitable for physicists and chemists who wish an introduction to the subject. The first sections of the book describe what optical pumping is …

High Sensitivity Optically Pumped Quantum Magnetometer

May 26, 2013· Quantum magnetometers based on optical pumping can achieve sensitivity as high as what SQUID-based devices can attain. In this paper, we discuss the principle of operation and the optimal design of an optically pumped quantum magnetometer.

Optical Pumping - Definition and Applications

Optical pumping is a process in which light energy is used to excite electrons from a lower to higher energy level. It was first developed by Alfred Kastler in the early 1950s and is primarily ...

Skew light propagation in optically thick optical pumping ...

causes excess absorption of the pumping light that can significantly reduce the efficiency of the optical pumping process even for angles of a few degrees. DOI: 10.1103/PhysRevA.66.033406 PACS number~s!: 32.80.Bx, 33.25.1k, 34.30.1h In current applications of spin-exchange optical pumping @1#, it is common that optically very thick alkali ...

OPTICAL PUMPING OF RUBIDIUM - Department of Physics

OPTICAL PUMPING OF RUBIDIUM . 1. INTRODUCTION Optical pumping [123] is a process used in high frequency spectroscopy, developed by A. Kastler who was awarded the Nobel Prize for this in 1966. In this experiment, anomalous Zeeman transitions in the ground state of . 87Rb and 85Rb with σ+- and σ--circular-polarized pumping light are observed

Optical Pumping - an overview | ScienceDirect Topics

(a) Optical pumping scheme to initialize the electron spin in its ground state |0〉. (b) The measured population in the electron spin excited state for a repeated process of optical pumping and π-pulse spin rotation. From Press D, Ladd TD, Zhang B, and Yamamoto Y (2008) Nature 456: 218.

Optically pumped alkali magnetometers for biomedical ...

created in the atomic medium through optical pump - ing, a process introduced in the 1950s, by which angular momentum of polarized light, resonant with an atomic ! Partial view of sensor array in the 19-channel Fribourg magnetocardiography (MCG) device and (inset) subject positioned for MCG measurements (Details in the text). Optically pumped ...

Optical Pumping - University of Michigan

Physics441/2 Optical Pumping 3 K =5/2 and 87Rb with K =3/2.The j =1/2 rubidium ground states for the two isotopes are split by the hyperfine interaction into doublets with F = K±1/2.The hyperfine interaction is the magnetic interaction of the nu-