Polarization spectroscopy and magnetically-induced dichroism of the potassium D_2 lines

Abstract

Abstract:We study modulation-free methods for producing sub-Doppler, dispersive line shapes for laser stabilization near the potassium D 2 transitions at 767 nm. Polarization spectroscopy is performed and a comparison is made between the use of a mirror or beam splitter for aligning the counter-propagating pump and probe beams. Conventional magneticallyinduced dichroism is found to suffer from a small dispersion and large background offset. We therefore introduce a modified scheme, using two spatially separated pump-probe beam pairs. Finally we compare our results to methods using phase modulation and heterodyne detection.

Influence of anti-relaxation coating of optical cells on the potassium D1line saturated absorption

“…We consider this result as particularly important because such a structure can be used as a simple frequency reference for laser frequency stabilization. Similar result has been obtained for the D 2 line of Potassium 12,13 where the frequency separation between the hyperfine transitions is smaller.…”

Analytical Study of Polarization Spectroscopy for the Jg=0 → Je=1 Transition

“…3, June 2013 282 lineshape in PS for the transition Jg=0→Je =1 of Sr atoms. Equations (7) and (8) are the main result of the paper. The amplitude and the slope of the spectrum are presented in Eq.…”

“…PS has been realized for many kinds of atoms such as Li [2], Rb [3][4][5][6], Cs [6,7], K [8], He [9], and Sr [10]. In the case of all the atoms except for Sr, the PS spectra result from three operating mechanisms such as Zeeman and hyperfine optical pumping and the saturation effect.…”

Observation and optimization of ^4He atomic polarization spectroscopy

“…Frequency locking through 4 He atomic spectroscopy has already been achieved in saturated absorption spectroscopy [5,6] and dichroic atomic vapor laser lock (DAVLL) [7]. Since then, polarization spectroscopy has been observed and mostly applied for laser frequency stabilization using various atomic elements, such as sodium [10], rubidium [11][12][13], cesium [14], lithium [15], potassium [16], chromium [17], and strontium [18]. This technique was first studied in 1976 [8] and was later improved by using two detectors [9].…”

“…However, for nearly all the modulation-free frequency stabilization techniques, such as DAVLL and polarization spectroscopy, the serious drawback is that the location of the zero-crossing point is prone to alter and drift, mainly due to the varying laser power [11] and magnetic field [16], which can seriously reduce the accuracy and long-term stability of the frequency locking performance. In this Letter, we demonstrate an experimental scheme for observing 4 He polarization spectroscopy with a distributed feedback fiber laser.…”