摘要
通过对环形泵辅相位匹配方式的解剖，发现所得到的CARS信号是由多种相让匹配方式产生的，分析了各种匹配方式产生的CARS强度的份额与空间分布。通过光路设计可得到与交叉BOXCARS相比拟的空间分辨率。计算和实验都证实了两束泵浦光与斯托克斯光在透镜表面上的张角有一最佳值，这种相位匹配方式是不存在相位失配的BOXCARS，并充分利用了环形泵浦束的能量。
The experimental results indicate that the CARS signal by annular-pump phase matching is induced by several matching patterns. The intensity portion and spatial distribution of CARS signal for these patterns were analyzed. The same spatial resolution with fold BOXCARS can be obtained by optical design in annular-pump CARS.Our calculation and experiment confirm that the angle between two pump and one Stokes beams at lens surface exists an optimum. So, ASED CARS is BOXCARS without phase-mismatching, which makes full use of the energy of annular-pump beam.
出处
《激光与光电子学进展》
CSCD
1998年第7期12-17,共6页
Laser & Optoelectronics Progress
基金
自然科学基金
关键词
环形泵浦
相位匹配
CARS技术
coherent anti-Stokes Raman spectroscopy, annular-pump phase-matching
