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11 November 2014 Miniature pulse compressor with double-line-density gratings
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Femtosecond laser technology is one of the frontiers in the fields of nonlinear optics, advanced manufacturing etc. The method of femtosecond pulse compression is an important research content. To compress the femtosecond pulse, we need to use negative dispersive elements to compensate the positive dispersion of Ti: sapphire crystal and other optical elements. For this purpose, we propose a miniature double-line-density grating pair in which the line density of the second grating is twice of the first one, the output pulse propagates along the way back. The density of the gratings is high, which will have a high diffraction efficiency and can compensate a high GVD ( group velocity dispersion ) in a small distance. The first grating is transmitted and the second one is reflective, the device will not occlude the beam propagation. With the pair of the gratings, the input positive chirped 89fs pulse is neatly compressed into the Fourier transform limited 44fs pulse with no spectral spatial walkoff and dispersion. It can be used for compression in laser cavity or out of the cavity. The gratings are easy to adjust and the structure is simple and compact, which has widespread interest in practical applications.
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Yanyang Li, Wei Jia, Changhe Zhou, Xiaona Yan, Shubin Li, Jin Wang, Kun Liu, and Yancong Lu "Miniature pulse compressor with double-line-density gratings", Proc. SPIE 9271, Holography, Diffractive Optics, and Applications VI, 92711H (11 November 2014);

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