Breakdown of angular momentum selection rules in high pressure optical pumping experiments.

نویسندگان

  • B Lancor
  • E Babcock
  • R Wyllie
  • T G Walker
چکیده

We present measurements, by using two complementary methods, of the breakdown of atomic angular momentum selection rules in He-broadened Rb vapor. Atomic dark states are rendered weakly absorbing due to fine-structure mixing during Rb-He collisions. The effect substantially increases the photon demand for optical pumping of dense vapors.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

High-efficiency detection of a single quantum of angular momentum by suppression of optical pumping.

We propose and demonstrate experimentally the discrimination between two spin states of an atom purely on the basis of their angular momentum. The discrimination relies on angular momentum selection rules and does not require magnetic effects such as a magnetic dipole moment of the atom or an applied magnetic field. The central ingredient is to prevent by coherent population trapping an optical...

متن کامل

Optical Pumping

Optical pumping uses light to affect the internal degrees of freedom of a sample of atoms in a vapor. These internal degrees of freedom are angular momentum states of the atomic ground state, which are populated when light is absorbed and emitted. This experiment reveals many phenomena of quantum mechanics including angular momentum selection rules, the density matrix, and resonance. Optical pu...

متن کامل

Fundamentals of Spin-Exchange Optical Pumping

The standard model of Spin-Exchange Optical Pumping of He has come under close scrutiny as researchers try to maximize the quantity and polarization of He. This paper will review four important effects that have come to light: 1) pumping with frequency narrowed diode lasers significantly improves the polarization and production rate as compared to off-theshelf broadband sources 2) Rb-K mixtures...

متن کامل

Spin-exchange optical pumping of noble-gas nuclei

Spin-exchange optical pumping of mixtures of alkali-metal vapors and noble gases can be used to efficiently polarize the nuclei of the noble-gas atoms. Liters of noble gases at standard temperature and pressure and with nuclear spin polarizations of several tens of percent are now used in many applications. The authors describe the basic phenomena that govern the spin-exchange process and revie...

متن کامل

M ar 2 00 5 Transfer of entanglement from electrons to photons by optical selection rules

The entanglement transfer from electrons localized in a pair of quantum dots to free photons is governed by optical selection rules, enforced by conservation of angular momentum. We point out that the transfer can not by achieved by means of unitary evolution unless the angular momentum of the two initial qubit states differs by 2 units of ¯ h. In particular, for spin-entangled electrons the di...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Physical review letters

دوره 105 8  شماره 

صفحات  -

تاریخ انتشار 2010