脉冲数字全息图的边缘可见性,具有很大的光路差异
概括
通过使用脉冲激光源,即使具有长光路径差异 (OPD),也可以实现稳定的干扰边缘. 脉冲干扰测量保持高边缘可见性,对于数字全息等应用至关重要.
科学领域:
- 光学和光子学 在光学和光子学.
- 干涉测量和全息学
背景情况:
- 干扰测量的稳定干扰边缘要求光路径差 (OPD) 小于源相干长度.
- 大型OPD会导致边缘相位漂移,降低可见性,并随着时间的推移洗掉边缘.
研究的目的:
- 在干涉测量中使用来自连续波 (CW) 激光源的光脉冲来分析边缘可见性.
- 为了证明高边缘可见性与OPD超过连贯长度使用脉冲源.
主要方法:
- 对脉冲干扰的边缘可见度大小平方的表达式的导出.
- 从CW激光源中雕刻的光脉冲的分析.
主要成果:
- 高边缘可见性可以实现,即使OPD比源连贯长度长得多.
- 指规则:源连贯时间应至少是脉冲持续时间的10倍,以 >95%的可见度与洛伦兹线形状.
结论:
- 脉冲干扰测量提供了一个可行的方法,以保持高边缘可见性,在大型OPD的系统.
- 这一发现对于在远程遥感中设计数字全息系统至关重要,因为在远程遥感中,路径长度匹配具有挑战性.
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