M. Pirbhai et al. [Phys. Rev. A 88, 060701(R) (2013)] reported a new optically pumped spin-exchange polarized-electron source developed to avoid the limitations of the traditional GaAs-type source and to enable a broader range of experiments. The spin-exchange gaseous source has introduced its own limitations with 650-mW laser power producing only 4 mu A of spin-polarized current with a 24% polarization and a 2-eV energy spread depending markedly on tenuous roles of various buffer gases which we consider are not explained cogently. Spin-related beam experiments over many decades have significant achievements using GaAs spin sources.
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机译：M.Pirbhai等。 [物理Rev. A 88，060701（R）（2013）]报告了一种新的光泵浦自旋交换极化电子源，其开发是为了避免传统GaAs型源的局限性并进行更广泛的实验。自旋交换气态源引入了其自身的局限性，即650 mW激光功率仅产生4μA自旋极化电流，其极化率为24％，能量散布为2 eV，这主要取决于各种缓冲气体的微弱作用。考虑的问题没有得到有力的解释。使用GaAs自旋源，数十年来与自旋相关的光束实验取得了显著成就。
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