Theoretical and Experimental Study of Optimization of Polarization Spectroscopy for the D₂ Closed Transition Line of ⁸⁷Rb Atoms

• Main Authors: Jeongyoun Jeong, Sanglok Lee, Sungi Hwang, Jaeuk Baek, Heung-Ryoul Noh, Geol Moon
• Format: Article
• Language: English
• Published: MDPI AG 2021-08-01
• Series: Applied Sciences
• Subjects: polarization spectroscopy; laser frequency stabilization
• Online Access: https://www.mdpi.com/2076-3417/11/16/7219

We experimentally and theoretically investigated the optimal condition of polarization spectroscopy for frequency stabilization on various pump beam intensities and vapor cell temperatures for the D<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> closed transition line of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>87</mn></msup></semantics></math></inline-formula>Rb atoms. We compared the experimental results, such as the amplitude, width, and slope, of the polarization spectroscopy signal with the theoretical results obtained from the numerical calculation of temporal density matrix equations. Based on the results, we found the optimal parameters, such as the pump beam intensity and vapor cell temperature, for polarization spectroscopy. The theoretically expected optimal parameters were, qualitatively, in good agreement with the experimental results.