237 research outputs found
Hanle detection for optical clocks
Considering the strong inhomogeneous spatial polarization and intensity
distribution of spontaneous decay fluorescence due to the Hanle effect, we
propose and demonstrate a universe Hanle detection configuration of
electron-shelving method for optical clocks. Experimental results from Ca
atomic beam optical frequency standard with 423 nm electron-shelving method
show that a designed Hanle detection geometry with optimized magnetic field
direction, detection laser beam propagation and polarization direction, and
detector position can improve the fluorescence collection rate by more than one
order of magnitude comparing with that of inefficient geometry. With the fixed
423 nm fluorescence, the improved 657 nm optical frequency standard signal
intensity is presented. And the potential application of the Hanle detection
geometry designed for facilitating the fluorescence collection for optical
lattice clock with a limited solid angle of the fluorescence collection has
been discussed. This Hanle detection configuration is also effective for ion
detection in ion optical clock and quantum information experiments. Besides, a
cylinder fluorescence collection structure is designed to increase the solid
angle of the fluorescence collection in Ca atomic beam optical frequency
standard.Comment: 5 pages, 6 figure
A High-Performance Triple Patterning Layout Decomposer with Balanced Density
Triple patterning lithography (TPL) has received more and more attentions
from industry as one of the leading candidate for 14nm/11nm nodes. In this
paper, we propose a high performance layout decomposer for TPL. Density
balancing is seamlessly integrated into all key steps in our TPL layout
decomposition, including density-balanced semi-definite programming (SDP),
density-based mapping, and density-balanced graph simplification. Our new TPL
decomposer can obtain high performance even compared to previous
state-of-the-art layout decomposers which are not balanced-density aware, e.g.,
by Yu et al. (ICCAD'11), Fang et al. (DAC'12), and Kuang et al. (DAC'13).
Furthermore, the balanced-density version of our decomposer can provide more
balanced density which leads to less edge placement error (EPE), while the
conflict and stitch numbers are still very comparable to our
non-balanced-density baseline
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