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Rabi-cycle laser cooling of atoms using long lived transition

Research Project

Project/Area Number 05555017
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Applied optics/Quantum optical engineering
Research InstitutionScience University of Tokyo

Principal Investigator

MORINAGA Atsuo  Science Univ. of Tokyo Faculty of Sci.& Tech. Assoc.Professor, 理工学部, 助教授 (90246687)

Co-Investigator(Kenkyū-buntansha) YAMASHITA Masahumi  Science Univ. of Tokyo Faculty of Sci.& Tech. Lecturer, 理工学部, 講師 (80089383)
TAKO Toshiharu  Science Univ. of Tokyo Faculty of Sci.& Tech. Professor, 理工学部, 教授 (20016794)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1994: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1993: ¥4,500,000 (Direct Cost: ¥4,500,000)
Keywordslaser cooling / Rabi-cycle / long lived transition
Research Abstract

Rabi-cycle laser cooling is one of the promising way to get cold atoms, since cooling time does not depend on the natural lifetime of the spontaneous emission but depends on the Rabi-cycle. The concept of Rabi-cycle cooling with pi pulses was presented. We examined the feasibility of the Rabi-cycle cooling by simulation. The recommended conditions are as follows.
1)Frequencies of absorption and stimulated emission for cooling are symmetrical respect to the resonance frequency depending on Doppler effect.
2)Number of cycles which are responsible to the effective cooling depends on the precision of pi pulse
3)laser frequency must be shifted to the resonance by the recoil frequency per each pulse.
4)A speed of frequency charping must be coincide with that of deceleration.
On the basis of simulation, we desined a prototype for the Rabi-cycle laser cooling of Ca atom using a long lived transition of ^1S_0-^3P_1. We have already formed the pi pulse chain using an electro-optic modulator drived by a frequency of 1 MHz and introduced the pi pulse chain to Ca atomic beam. At present we are making a timing circuit which charps the laser frequency matching to the speed of deceleration.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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