Laser在非均匀展宽Yb原子的波长失配级联系统中诱导双折射
Laser induced birefringence in a wavelength-mismatched cascade system of inhomogeneously broadened Yb atoms
摘要：
报道了在强泵浦场和探测场作用下，非均匀展宽镱原子的波长失配级联系统（J=0 \leftrightarrow J=1 \leftrightarrow J=0跃迁）中的激光感生双折射现象。研究了固定频率下强探测场的两个圆偏振（σ_p^+和σ_p^-）分量的透射谱，这取决于圆偏振（σ_c^-）耦合场与双光子共振的失谐量。我们发现，σ_p^+（σ_p^-）偏振分量具有窄的电磁感应吸收（透明）谱。密度矩阵方程的数值解与实验结果定性一致。通过探测探测光场的斯托克斯参量，获得了无多普勒色散的LIB信号，使我们能够在没有频率调制的情况下稳定耦合激光的频率。
英文摘要：
We report the observation of laser induced birefringence (LIB) in a wavelength-mismatched cascade system (J=0 \leftrightarrow J=1 \leftrightarrow J=0 transitions) of inhomogeneously broadened ytterbium atoms with strong pump and probe fields. We investigate the transmission spectrum of two circular polarization (σ_p^+ and σ_p^-) components of strong probe field at fixed frequency, depending on the detuning of circularly polarized (σ_c^-) coupling field from two-photon resonance. We find that σ_p^+ (σ_p^-) polarized component exhibits a narrow electromagnetically induced absorption (transparency) spectrum. Numerical solutions of density matrix equations show qualitative agreement with experimental results. A Doppler-free dispersive LIB signal is obtained by detecting the Stokes parameter of the probe field, enabling us to stabilize the frequency of coupling laser without frequency modulation.
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