2024/04/23 by Yuxin Wang, Wang, Yuxin, Zhiyue Zheng +17
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #FOS: Physical sciences #Laser-Matter Interactions and Applications #Optics (physics.optics) #Solid State Laser Technologies
paper · pdf · doi:10.48550/arxiv.2404.14734
openalex publication_date 2024/04/23 · openalex created_date 2024/04/26 · openalex updated_date 2026/07/28
We propose a novel pulsed optical field method that alternately switches the pump beam in conventional saturation absorption to time-division multiplex the same probe beam into both probe and reference beams, followed by digital differential processing to achieve deterministic zero-background Doppler-free spectroscopy. This method effectively mitigates Doppler broadening and common-mode optical noise by addressing disturbances such as non-uniform background absorption and environmental noise, thereby offering enhanced accuracy and robustness. Using this technique, we measured the absolute frequency of Yb+ isotopes in the 6s2 1S0→ 6s6p 1P1 transition. By employing an error signal derived from the first-derivative demodulated spectrum of 174Yb+, we achieved efficient stabilization of a 369.5 nm ultraviolet diode laser, demonstrating a frequency stability of 3 × 10-11 over a 1500-second averaging period and a locking point uncertainty of 850 kHz sustained over 10 days. Furthermore, we report the first in-situ observation of Doppler-free Zeeman sub-level spectra, highlighting the precision of this method and its potential application in measuring magnetic field gradients.