Using frequency-narrowed, tunable laser diode arrays with integrated volume holographic gratings for spin-exchange optical pumping at high resonant fluxes and xenon densities
Using frequency-narrowed, tunable laser diode arrays with integrated volume holographic gratings for spin-exchange optical pumping at high resonant fluxes and xenon densities
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使用带有集成体全息光栅的窄频、可调谐激光二极管阵列，在高谐振通量和氙密度下进行自旋交换光泵浦
DOI：
10.1007/s00340-012-4924-x
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Whiting N
中科院分区：
文献类型：
--
作者：
Whiting N
采用集成的“片上”体全息光栅的新一代激光二极管阵列可以提供高功率、光谱窄的输出，可以围绕Rb D1线进行调谐，而不会对激光器的通量或光谱轮廓造成重大变化。这些性质被用来独立地评估改变激光质心波长和功率对批模式Rb/129Xe自旋交换光泵浦(SEOP)的影响，作为氙分压和细胞温度的函数。局部优化的SEOP通常是通过将激光调谐到RB D1线的红色或蓝色一侧来实现的；在较低的细胞温度下观察到SEOP的全局优化，并且遵循从标称波长不对称加宽和红移的D1吸收分布。激光激发的最佳波长对细胞温度和Xe密度的复杂依赖似乎是细胞照明和Rb/129Xe自旋交换率之间的相互作用的结果，以及[Xe]细胞对Rb吸收线型的改变，这与基于先前工作的预期定性一致。Rev.A，56：4569-4578，(1997)]，但震级要大得多。与传统的宽带激光器相比，这些新一代激光器在129Xe偏振方面提供了2-3倍的∼改进。
Next-generation laser diode arrays with integrated ‘on-chip’ volume holographic gratings can provide high power with spectrally narrowed output that can be tuned about the rubidium D1line—without causing significant changes to the laser’s flux or spectral profile. These properties were exploited to independently evaluate the effects of varying the laser centroid wavelength and power on batch-mode Rb/129Xe spin-exchange optical pumping (SEOP) as functions of xenon partial pressure and cell temperature. Locally optimized SEOP was often achieved with the laser tuned to either the red or blue side of the Rb D1line; global optimization of SEOP was observed at lower cell temperatures and followed the D1absorption profile, which was asymmetrically broadened and red-shifted from the nominal wavelength. The complex dependence of the optimal wavelength for laser excitation on the cell temperature and Xe density appears to result from an interplay between cell illumination and the Rb/129Xe spin-exchange rate, as well as [Xe]cell-dependent changes to the Rb absorption lineshape that are in qualitative agreement with expectations based on previous work [Romalis et al., Phys. Rev. A, 56:4569–4578, (1997)], but significantly greater in magnitude. These next-generation lasers provide a ∼2–3-fold improvement in129Xe polarization compared to conventional broadband lasers.
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DOI：
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发表时间：
2002
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DOI：
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发表时间：
2003
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