大口径镀金衍射光栅是超短脉冲进行脉宽压缩的核心光学部件,价格昂贵,且十分娇贵。在10 TW装置中,由两块140 mm×120 mm×20 mm、刻线密度1 500 mm-1的平面镀金衍射光栅组成平行双光栅脉宽压缩器,可以将800 nm、300 ps的超短脉冲压缩到40 fs之内,峰值功率提高4个量级。在日常使用中,由于极高的刻线密度,各种有机物和水分子很容易附着在光栅表面的刻槽之内,特别是承载压缩器的真空腔室材料、各种光学零部件和密封件在真空条件下扩散出的润滑油蒸汽, Large-diameter gold-plated diffraction grating is the core of ultra-short pulse compression pulse optical components, expensive, and very delicate. In the 10 TW device, a parallel dual grating pulse width compressor consisting of two planar gold-plated diffraction gratings of 140 mm × 120 mm × 20 mm and engraved density of 1 500 mm-1 can be used to ultra-short 800 nm and 300 ps Pulse compression within 40 fs, the peak power increased by 4 orders of magnitude. In daily use, due to the very high line density, a variety of organic matter and water molecules can easily adhere to the surface of the grating grooves, especially the vacuum chamber bearing the compressor material, a variety of optical components and seals In the vacuum conditions, the proliferation of oil vapor,