Direct spectroscopy of Rubidium using a narrow-line transition at 420 nm

Abstract

The 5S$\to$6P transition in Rubidium (Rb) at 420 nm offers the advantage of a narrower linewidth and diverse applications in quantum technologies. However, the direct spectroscopy at this transition is challenging due to its weak transition strength. In this paper, we have discussed the saturated absorption spectroscopy (SAS) of Rb using the narrow-line transition at 420 nm. We have studied the effect of the temperature of the Rb cell, pump power and the beam size on the SAS dip heights and their linewidths. Additionally, our study offers a comprehensive examination, encompassing all eight error signals of Rb for the 5S$\to$6P transition at 420 nm and 421 nm. These findings contribute valuable insights to the field of laser frequency stabilization of Rb at blue transition and can be useful in quantum technologies based on this transition.

8 pages, 6 figures

References in corpus (5)

• Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator
• Compact 459 nm Cs cell optical frequency standard with $2.1\times {10}^{-13}/\sqrt{\tau }$ short-term stability
• Hyperfine measurement of $6{\text{P}}_{1/2}$ state in ${}^{87}\text{Rb}$ using double resonance on blue and IR transition
• Narrow-line cooling of ${}^{87}$Rb using 5S${}_{1/2}\to$ 6P${}_{3/2}$ open transition at 420 nm
• Resolving closely spaced levels for Doppler mismatched double resonance

Cited by in corpus (3)

• Continuous loading of magneto-optical trap of Rb at narrow transition
• Local vs non-local dynamics in cavity-coupled Rydberg atom arrays
• Role of spontaneously generated coherence (SGC) in laser cooling of atoms