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Journal of the Optical Society of America B

Polarization spectroscopy of ^1S_0−^1P_1 transition of neutral ytterbium isotopes in hollow cathode lamp

Shaobing Zhu, Tao Chen, Xiaolin Li, Yuzhu Wang

Published Sep 8, 2014• 10 citations
Publisher

Abstract

We analyze the polarization spectrum of S10−P11 transition in atomic ytterbium with bosonic and fermionic isotopes in a hollow cathode lamp. Bosonic signals are created by saturation effects because of their only nondegenerate ground state, whereas fermionic counterparts are generated by optical pumping. The dependence of spectral signals on the cathode lamp current as well as the powers of the pump and probe beams are systematically investigated. Optimized parameters for future frequency-locking applications are suggested. The effects of pump beam polarization are determined by comparing results obtained from a circularly polarized pump beam to those obtained from an elliptically polarized one; here, enhanced signals were achieved by the former compared with the latter.

DOI
10.1364/josab.31.002302

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We analyze the polarization spectrum of S10−P11 transition in atomic ytterbium with bosonic and fermionic isotopes in a hollow cathode lamp. Bosonic signals are created by saturation effects because of their only nondegenerate ground state, whereas fermionic counterparts are generated by optical pumping. The dependence of spectral signals on the cathode lamp current as well as the powers of the pump and probe beams are systematically investigated. Optimized parameters for future frequency-locking applications are suggested. The effects of pump beam polarization are determined by comparing results obtained from a circularly polarized pump beam to those obtained from an elliptically polarized one; here, enhanced signals were achieved by the former compared with the latter.
We present the experimental study of modulation transfer spectroscopy of ytterbium atoms in a hollow cathode lamp. The dependences of its linewidth, slope and magnitude on the various experimental parameters are measured and fitted by the well-known theoretical expressions. The experimental results are in good agreement with the theoretical prediction. We have observed the Dicke narrowing effect by increasing the current of the hollow cathode lamp. It is also found that there are the optimal current and laser power to generate the better modulation transfer spectroscopy signal, which can be employed for locking the laser frequency to the atomic transition.
Abstract In this work we perform polarization spectroscopy of erbium atoms in a hollow cathode lamp (HCL). We review the theory behind Doppler-free polarization spectroscopy, theoretically model the expected erbium polarization spectra, and compare the numerically calculated spectra to our experimental data. We further analyze the dependence of the measured spectra on the HCL current and the peak intensities of our pump and probe lasers to determine conditions. Applications include wavelength stabilization of diode laser radiation to the 400.91 nm erbium transition.
Isotope selective optical excitation of atoms is important for experiments with neutral atoms, metrology, and work with trapped ions, including quantum information processing. Polarization-enhanced absorption spectroscopy is used to frequency stabilise a tunable external cavity laser diode system at 398.9 nm for isotope selective photoionization of neutral Yb atoms. This spectroscopy technique is used to measure isotope resolved dispersive features from transitions within a see through configuration Ytterbium hollow-cathode discharge lamp. This Doppler-free dichroic polarization spectroscopy is realised by retro-reflecting a laser beam through the discharge and analysing the polarization dependent absorption with balanced detection. The spectroscopy signal is recovered using lock-in detection of frequency modulation induced by current modulation of the external cavity laser diode. Here, we show the use of polarization-enhanced absorption spectroscopy for isotope selectively loading of 171^{171}171Yb+^++, 172^{172}172Yb+^++, or 174^{174}174Yb+^++ ions into an RF Paul trap.
We experimentally observe polarization spectroscopy (PS) of the S01-P31 transition of mercury atom gases at 253.7 nm. The PS signal can be observed in all six richly abundant isotopes and the PS signal of six transitions for laser cooling are all clear and of a dispersive line shape. The optimized pump power and probe power are found for the PS of Hg202. We find the linearly polarized component in the pump beam will distort the original PS signal due to the use of linear PS. Consequently, the purity of the pump beam is crucial to laser frequency stabilization by PS.
The hyperfine coupling coefficients and isotope shifts associated with the Yb+ 6 P23/2∘, Yb 73S1, Yb 6 P11∘, and Yb 6 1D2 states were investigated by Doppler-free saturated absorption laser spectroscopy in an unenriched Yb hollow-cathode discharge. The hyperfine coefficients determined in this experiment are as follows: for the Yb+ 6 P23/2∘ state, 171A = 0.877(20), 173A = −0.245(10), and 173B = −1.460(50); for the 73S1 state, 171A = 6.81(10), 173A = −1.879(10), and 173B = −0.003(18); for the Yb 61D2 state, 171A = −1.573(8), 173A = 0.439(2), and 173B = 0.153(10) GHz.
The ytterbium atom is widely used in the fields of atomic physics, cavity quantum electrodynamics, quantum information processing, and optical frequency standards. There is however a strong dispersion among the reported values of the 1S0 → 1P1 transition frequency. In this article, we present two independent measurements of the absolute frequency of this transition performed with two different wavemeters using atomic fluorescence spectroscopy. The cancellation of Doppler shifts is obtained by fine tuning the angle between the probe laser and the atomic beam. The resulting 174Yb isotope transition frequency is estimated to be 751 526 537 ± 27 MHz.