空气击穿效应对粒子全息像的影响
Effects of air ionization on particle holographic image
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摘要: 在粒子场全息实验中，研究了4F光学成像系统不抽真空时，其内部实焦点处由于光脉冲能量聚焦引起的空气击穿现象。发现在这种情况下得到的同轴和离轴全息粒子再现像，与实焦点未被击穿时得到的正常全息再现像相比，其强度分布发生了反转。理论分析表明，这种情况是由于实焦点处空气击穿引起的空间滤波效应造成的。研究发现:在离轴粒子场全息实验中，合理调整曝光强度，利用4F系统中的空气击穿效应可以获得高清晰度的全息再现象。Abstract: In particle field holography, an optical system named 4F system is usually used for imaging particles in an appropriate position. At the real focus of the 4F system, air will be ionized when the laser pulse energy increases. In this case, intensity distribution of reconstructed images of off-line and in-line holography are opposite to those obtained under normal conditions. The reason is the spatial filtering. effect caused by the air ionization. Furthermore, high quality off-line particle holographic images can be obtained with air ionized, by adjusting the exposure pulse intensity.
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Key words:
- holography /
- particle field /
- air-ionization /
- in-line /
- off-line /
- reconstructed image
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