Abstract This paper presents a compact design for spectral shearing interferometry to reconstruct an ultrafast electric-field (SPIDER) with a high signal-to-noise ratio (SNR) and stability. Compared experimentally with the traditional SPIDER based on a Michelson interferometer (MI), this design can improve the SNR by a factor of 3.7 in a 25 dB BW region. Using the material dispersions of 6 mm BK7 plates as a target, the phase errors between the measured and theoretical values are less than 2.6 mrad, which is improved by a factor of ~4 from 10.3 mrad measured with the MI-based version. Even for a 1 mm fused silica plate, the measured phase errors are less than 2.1 mrad from the calculated values. Using this design for a 3-day test of our ultrashort pulse laser system, the variation in the output pulse width from the first to the third day is only 1.5%. We attribute this excellent performance to the common-path and all-transmission design of the test pulse pair, giving the design superior capacity against external disturbances. Our design can also work with the two-step phase-shift (TSPS) method to improve its measurement of the plulses with complex temporal/spectral structures.

中文翻译：

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一种紧凑、高度稳定的光谱剪切干涉仪，可准确重建超快激光场

摘要 本文提出了一种用于光谱剪切干涉测量的紧凑设计，以重建具有高信噪比 (SNR) 和稳定性的超快电场 (SPIDER)。通过实验与基于迈克尔逊干涉仪 (MI) 的传统 SPIDER 相比，该设计可以在 25 dB 带宽区域内将 SNR 提高 3.7 倍。使用 6 mm BK7 板的材料色散作为目标，测量值和理论值之间的相位误差小于 2.6 mrad，比基于 MI 版本测量的 10.3 mrad 提高了约 4 倍。即使对于 1 mm 熔融石英板，测得的相位误差与计算值的误差也小于 2.1 mrad。使用此设计对我们的超短脉冲激光系统进行为期 3 天的测试，从第一天到第三天，输出脉冲宽度的变化仅为 1。5%。我们将这种出色的性能归功于测试脉冲对的公共路径和全传输设计，使设计具有卓越的抗外部干扰能力。我们的设计还可以使用两步相移 (TSPS) 方法来改进其对具有复杂时间/光谱结构的脉冲的测量。