Publications by authors named "Tahiyat Rahman"
We demonstrate a method to enhance the atom loading rate of a ytterbium (Yb) magneto-optic trap (MOT) operating on the 556 nm S → P intercombination transition (narrow linewidth Γ = 2π × 182 kHz). Following traditional Zeeman slowing of an atomic beam near the 399 nm S → P transition (broad linewidth Γ = 2π × 29 MHz), two laser beams in a crossed-beam geometry, frequency tuned near the same transition, provide additional slowing immediately prior to the MOT. Using this technique, we observe an improvement by a factor of 6 in the atom loading rate of a narrow-line Yb MOT.
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- The study analyzes the contributions of electronic and lattice effects to picosecond time-resolved X-ray absorption spectra (trXAS) of CuO, focusing on oxygen K-edge absorption at different excitation wavelengths (355 nm and 532 nm).
- It finds that lattice heating dominates the trXAS spectra at delays longer than 150 ps, providing insights into temperature evolution profiles over nanosecond timescales, effectively functioning as an "ultrafast thermometer."
- The research establishes a model for thermal energy deposition and diffusion, yielding a thermal conductivity value that aligns with existing literature for CuO, while also addressing challenges faced during analysis at shorter UV wavelengths.