In this paper, the physical mechanism of the interaction between electromagnetic wave and spectral-hole burning crystal material is investigated in detail. In the small signal regime, a perturbation theory model is us...In this paper, the physical mechanism of the interaction between electromagnetic wave and spectral-hole burning crystal material is investigated in detail. In the small signal regime, a perturbation theory model is used to analyze the mechanism of spectral-hole burning. By solving the Liouville equation, three-order perturbation results are obtained. From the theoretic analysis, spectral-hole burning can be interpreted as a photon echo of the zero-order diffraction echo when the first optical pulse and the second optical pulse are overlapped in time. According to the model, the spectral-hole width is dependent on the chirp rate of the reading laser. When the chirp rate is slow with respect to the spectral features of interest, the spectral hole is closely mapped into time domain. For a fast chirp rate, distortions are observed. The results follow Maxwell-Bloch model and they are also in good agreement with the experimental results.展开更多
目的通过频域光学相干断层扫描观察特发性黄斑裂孔患者手术前后光感受器内外节的变化,并探讨其与视力预后的关系。方法前瞻性对比分析28例(30眼)确诊并氉接受玻璃体手术治疗的特发性黄斑裂孔患者的临床资料,分别记录手术前后的最佳矫正...目的通过频域光学相干断层扫描观察特发性黄斑裂孔患者手术前后光感受器内外节的变化,并探讨其与视力预后的关系。方法前瞻性对比分析28例(30眼)确诊并氉接受玻璃体手术治疗的特发性黄斑裂孔患者的临床资料,分别记录手术前后的最佳矫正视力(转换成LogMAR视力)和水平方向上光感受器内外节缺失区直径(diameter of IS/OS absence,DIOA),分析两者的相关性。结果术后22眼黄斑裂孔闭合,裂孔封闭率为73.3%。术前LogMAR视力为0.99±0.37,术后12个月为0.75±0.46,差异有统计学意义(t=5.37,P<0.05)。术前DIOA为551～2900(1945.57±609.33)μm,术后12个月为412～2811(1357.07±772.67)μm,术后较术前明显降低,差异有统计学意义(t=3.31,P<0.05)。经Spearman相关分析,手术前后LogMAR视力与DIOA之间均具有显著正相关性(r=0.895、0.921,均为P<0.01)。结论特发性黄斑裂孔患者LogMAR视力与手术前后DIOA具有明显正相关性,DIOA是评估患者视力预后的重要因素。展开更多
基金supported by the Special Funds for Scientific and Technological Innovation Projects,Tianjin,China(Grant No.10FDZDGX00400)
文摘In this paper, the physical mechanism of the interaction between electromagnetic wave and spectral-hole burning crystal material is investigated in detail. In the small signal regime, a perturbation theory model is used to analyze the mechanism of spectral-hole burning. By solving the Liouville equation, three-order perturbation results are obtained. From the theoretic analysis, spectral-hole burning can be interpreted as a photon echo of the zero-order diffraction echo when the first optical pulse and the second optical pulse are overlapped in time. According to the model, the spectral-hole width is dependent on the chirp rate of the reading laser. When the chirp rate is slow with respect to the spectral features of interest, the spectral hole is closely mapped into time domain. For a fast chirp rate, distortions are observed. The results follow Maxwell-Bloch model and they are also in good agreement with the experimental results.
文摘目的通过频域光学相干断层扫描观察特发性黄斑裂孔患者手术前后光感受器内外节的变化,并探讨其与视力预后的关系。方法前瞻性对比分析28例(30眼)确诊并氉接受玻璃体手术治疗的特发性黄斑裂孔患者的临床资料,分别记录手术前后的最佳矫正视力(转换成LogMAR视力)和水平方向上光感受器内外节缺失区直径(diameter of IS/OS absence,DIOA),分析两者的相关性。结果术后22眼黄斑裂孔闭合,裂孔封闭率为73.3%。术前LogMAR视力为0.99±0.37,术后12个月为0.75±0.46,差异有统计学意义(t=5.37,P<0.05)。术前DIOA为551～2900(1945.57±609.33)μm,术后12个月为412～2811(1357.07±772.67)μm,术后较术前明显降低,差异有统计学意义(t=3.31,P<0.05)。经Spearman相关分析,手术前后LogMAR视力与DIOA之间均具有显著正相关性(r=0.895、0.921,均为P<0.01)。结论特发性黄斑裂孔患者LogMAR视力与手术前后DIOA具有明显正相关性,DIOA是评估患者视力预后的重要因素。
