自旋噪声光谱学中极化灵敏度的来源
Resources of polarimetric sensitivity in spin noise spectroscopy
摘要：
我们注意到这样一个事实，即最终（散粒噪声有限）偏振灵敏度可以提高数量级离开入射到光电探测器上的光子通量在同一个低水平。这个机会是至关重要的，为当今的自旋噪声光谱，其中通过增加探测光束功率的灵敏度的直接增加是强烈限制的宽带光电探测器的容许输入功率。灵敏度的增益是通过用具有更强偏振消光的几何结构替换在具有平衡探测器的常规方案中常用的45度偏振几何结构来实现的。这些高消光偏振几何结构的效率与检测到的信号的增强超过一个数量级的散装n：GaAs在835-918 nm的光谱范围内的自旋噪声光谱的测量证明。结果表明，不可避免的增长的探测光束的功率与灵敏度增益使自旋噪声光谱更加微扰，但在同一时间，开辟了新的机会，研究非线性相互作用的强光场与自旋系综。
英文摘要：
We attract attention to the fact that the ultimate (shot-noise-limited) polarimetric sensitivity can be enhanced by orders of magnitude leaving the photon flux incident onto the photodetector on the same low level. This opportunity is of crucial importance for present-day spin noise spectroscopy, where a direct increase of sensitivity by increasing the probe beam power is strongly restricted by the admissible input power of the broadband photodetectors. The gain in sensitivity is achieved by replacing the 45-deg polarization geometry commonly used in conventional schemes with balanced detectors by geometries with stronger polarization extinction. The efficiency of these high-extinction polarization geometries with enhancement of the detected signal by more than an order of magnitude is demonstrated by measurements of the spin noise spectra of bulk n:GaAs in the spectral range 835-918 nm. It is shown that the inevitable growth of the probe beam power with the sensitivity gain makes spin noise spectroscopy much more perturbative, but, at the same time, opens up fresh opportunities for studying nonlinear interactions of strong light fields with spin ensembles.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
