Experimental investigation of the closest parallel pulses in holographic femtosecond laser processing
Experimental investigation of the closest parallel pulses in holographic femtosecond laser processing
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DOI：
10.1007/s00339-012-6801-1
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
Y. Hayasaki;Maki Nishitani;Hidetomo Takahashi;Hirotsugu Yamamoto;A. Takita;Daich Suzuki;S. Hasegawa
中科院分区：
文献类型：
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作者：
Y. Hayasaki;Maki Nishitani;Hidetomo Takahashi;Hirotsugu Yamamoto;A. Takita;Daich Suzuki;S. Hasegawa
在飞秒激光全息加工中，当计算全息图再现像的相位间隔小于光束直径时，衍射平行光脉冲会因相位不连续和邻域之间的相互干涉而发生畸变。我们研究了用不同间隔的平行脉冲在玻璃表面进行全息制作。在飞秒激光全息加工中，我们找到了距离最近的平行光脉冲，并保证了脉冲间的距离，避免了脉冲间的干涉。最小间隔是衍射光束直径的2.8倍。实验结果也得到了计算机模拟的支持。我们的研究结果对全息激光加工系统的设计具有重要的指导意义。
In holographic femtosecond laser processing, diffractive parallel pulses are distorted by phase discontinuities and mutual interference between the neighborhoods in the reconstructed image of a Fourier computer-generated hologram when the interval is smaller than the beam diameter. We investigated holographic fabrication on a glass surface using parallel pulses with different intervals. We found the closest parallel pulses with sufficient separation to avoid mutual interference in holographic femtosecond laser processing. The minimum interval was 2.8 times larger than the diffracted beam diameter. The experimental results were also supported by a computer simulation. Our findings will be very useful in the design of holographic laser processing systems.