Abstract
The laser frequency stability is an important topic in varies AMO research realms, such as molecule structures, optical-fiber communication, metrology, and the atomic clock. One of the trustable reference to facilitate frequency-locking is atomic spectroscopy. We measured the polarization spectroscopy of gaseous helium-4, around the 1083-nm D1 and D2 transition lines. By using the Origin software, we fit the data with the Gaussian distribution function, analyzing the line-shape, and calculating the temperature of the gases by the Doppler broadening equation.