Coherent two-field spectroscopy calculations with different choices of the quantization (<i>z</i>) axis are compared. In a system driven by a strong coupling field and a weak probe field, alignment of the <i>z</i> axis along either the polarization direction of a linearly polarized coupling field or the propagation direction of a circularly polarized coupling field is shown to simplify the calculations and facilitate interpretation of the results. The advantages of a suitable choice of the <i>z</i> axis are highlighted with an example of a degenerate three-level system of electromagnetically induced transparency.
© 2002 Optical Society of America
Yun-Wen Chen, Chung-Wei Lin, Ying-Cheng Chen, and Ite A. Yu, "Quantization axes in coherent two-field spectroscopy," J. Opt. Soc. Am. B 19, 1917-1921 (2002)