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20 April 2024 |
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Article overview
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Blue laser cooling transitions in Tm I | | N. Kolachevsky
; A. Akimov
; I. Tolstikhina
; K. Chebakov
; A. Sokolov
; P. Rodionov
; S. Kanorski
; V. Sorokin
; | | Date: |
16 Jul 2007 | | Abstract: | We have studied possible candidates for laser cooling transitions in
$^{169}$Tm in the spectral region 410 -- 420 nm. By means of saturation
absorption spectroscopy we have measured the hyperfine structure and rates of
two nearly closed cycling transitions from the ground state
$4f^{13}6s^2(^2F_0)(J_g=7/2)$ to upper states
$4f^{12}(^3H_5)5d_{3/2}6s^2(J_e=9/2)$ at 410.6 nm and
$4f^{12}(^3F_4)5d_{5/2}6s^2(J_e=9/2)$ at 420.4 nm and evaluated the life times
of the excited levels as 16.1(8) ns and 40(4) ns respectively. Decay rates from
these levels to neighboring opposite-parity levels are evaluated by means of
Hartree-Fock calculations. We conclude, that the strong transition at 410.6 nm
has an optical leak rate of less then $2cdot10^{-5}$ and can be used for
efficient laser cooling of $^{169}$Tm from a thermal atomic beam. In addition
we give a calculated value of $7(2)$ s$^{-1}$ for the rate of magnetic-dipole
transition at 1.14 $mu$m between the fine structure levels
$(J_g=7/2)leftrightarrow(J’_g=5/2)$ of the ground state. Due to efficient
shielding by the closed $6s^2$ shell, this transition is insensitive to
collisions which makes it a promising candidate for applications in atomic
clocks. | | Source: | arXiv, arxiv.0707.2280 | | Services: | Forum | Review | PDF | Favorites | |
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