Optical protection of alkali-metal atoms from spin relaxation

• URL: http://arxiv.org/abs/2209.12360v2
• Date: Sun, 06 Jul 2025 18:22:39 GMT
• Title: Optical protection of alkali-metal atoms from spin relaxation
• Authors: Avraham Berrebi, Mark Dikopoltsev, Ori Katz, Or Katz,
• Abstract summary: We present an optical technique for suppressing relaxation in alkali-metal spins using a single off-resonant laser beam.<n>We experimentally demonstrate up to a ninefold reduction in decoherence of warm cesium vapor, achieving simultaneous protection from both spin-exchange relaxation and partial depolarization from coated cell walls.
• Score: 4.010208637548414
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present an optical technique for suppressing relaxation in alkali-metal spins using a single off-resonant laser beam. The method harnesses a physical mechanism that synchronizes Larmor precession in the two hyperfine manifolds, protecting magnetic coherence from relaxation caused by spin-exchange and other hyperfine-changing collisions. We experimentally demonstrate up to a ninefold reduction in decoherence of warm cesium vapor, achieving simultaneous protection from both spin-exchange relaxation and partial depolarization from coated cell walls. The technique substantially enhances the spin precession quality factor and maintains a stable gyromagnetic ratio independent of spin polarization, even under frequent collisions. These findings offer a pathway for mitigating dominant relaxation channels in alkali-metal-based applications and experiments, particularly in anti-relaxation-coated cells.

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