(FY2019-000411-AS) Intra-Cavity Enhancement for Calcium Laser Cooling in a compact Penning trap clock (ICE-CLC)
Abstract
Georgia Tech Research Institute proposes to improve the fundamental frequency stability ofportable atomic frequency references using two-species ion arrays confined in a compactPenning trap. Current commercial standards largely rely on neutral atomic vapors or beams andare primarily limited by temperature (or equivalently atomic velocity) instabilities. In order toreduce or remove the primary long-term stability limitations in existing portable references, wepropose a clock design based on radiofrequency (RF) interrogation of a crystal of approximatelyone million 43Ca+ ions confined in a small-scale Penning trap that was developed under Office ofNaval Research program N00014-17-1-2408 (PERMION). Unlike RF Paul traps, our permanentmagnet design requires virtually zero power for ion trapping and allows for confinement of largeion crystals without micromotion effects. We will modify our existing compact Penning trap toaccommodate temperature-stable SmCo permanent magnets and planar trap electrodes to confine44Ca+ (coolant) and 43Ca+ (clock) ions. For ultimate system portability, an all-infrared lasercooling and state detection scheme will be employed that uses cavity enhancement of 729 nmlaser beam intensity for fast excitation of the Ca+ electric quadrupole transition and backgroundfreefluorescence detection. Second-order Doppler shift uncertainty - a leading systematic incurrent systems - will be minimized via Doppler laser cooling and quadrupole rotating wallcontrol of the ion crystal rotation frequency.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 08, 2020
- Source ID
- N000142012427
Entities
People
- Brian C. Sawyer
Organizations
- Georgia Tech Applied Research Corporation
- Office of Naval Research
- United States Navy