4f结构间距失调对达曼类滤波器输出脉冲特性的影响
Effect of mismatched spacing for 4f configure on output pulses of Dammann-type fitters
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摘要: 研究了4f结构的飞秒脉冲时空变换整形装置在各元件间距不等的情况下对脉冲输出特性的影响，理论分析了间距失调效应对等间距和不等间距达曼光栅滤波器的脉冲输出特性的影响。结果表明4f结构间距失调后无论是能量还是平均度都不如等间距高，中心脉冲能量变小，其它级次脉冲生出更多旁瓣；失调量越小，输出的脉冲质量越高，对于f为12 cm的装置，当失调量小于1 cm时，对输出脉冲影响较小。Abstract: The misalignment of 4f-configure femtosecond pulse shaping system with space-time conversion can cause aberrations of the output pulse. With theoretical analysis, the effect of the mismatched spacing between the components of 4f Fourier processing system for equally-spaced and unequally-spaced Dammann filters is calculated in this paper. It is concluded that the uniformity and the intensity of the output pulse are relevant to the spacing misalignment. As the intensity of center pulse lowers, the output pulses have more side wings. For the laser facility with 12 cm focus length, when the mismatch is less than 1 cm, the output pulse will not be affected seriously.
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