Wu Z Q, Tong W G
Department of Chemistry, San Diego State University, California 92182.
Anal Chem. 1991 May 1;63(9):899-903. doi: 10.1021/ac00009a012.
Stable isotope analysis based on vectorial optical-phase conjugation by resonant degenerate four-wave mixing (D4WM) is reported by using a D4WM method with vertically polarized pump beams and a circularly polarized probe beam. Since the polarization of the signal beam is different from that of the pump beams, the background radiation is suppressed more effectively. Excellent sensitivity, high spectral resolution, and efficient optical detection make this an effective and unusually convenient nonlinear spectrometric method for the analysis of trace amounts of stable isotopes. Using an excimer-pumped pulsed dye laser, the fine structures of lithium are examined. A detection limit of 2.5 ng/mL lithium is observed while a Doppler-free resolution is maintained by using transient "coherent-grating" based D4WM spectroscopy.
报道了基于共振简并四波混频（D4WM）的矢量光学相位共轭的稳定同位素分析方法，该方法使用垂直偏振泵浦光束和圆偏振探测光束的D4WM方法。由于信号光束的偏振与泵浦光束不同，背景辐射得到了更有效的抑制。出色的灵敏度、高光谱分辨率和高效的光学检测，使其成为一种用于分析痕量稳定同位素的有效且异常便捷的非线性光谱方法。使用准分子泵浦脉冲染料激光器，研究了锂的精细结构。观察到锂的检测限为2.5 ng/mL，同时通过基于瞬态“相干光栅”的D4WM光谱法保持了无多普勒分辨率。
