500nm带宽啁啾镜对的设计与应用

Design and application of 500nm bandwidth chirped mirror pair

设计了中心波长在825nm、有效带宽在600nm^1100nm的超宽带啁啾镜对,色散补偿量目标值为-100fs2。配对设计的啁啾镜对有效抑制了单个啁啾镜的色散振荡,啁啾镜对色散振荡幅度的最大值为±50fs2,用设计制作的啁啾镜对进行色散补偿,用频率分辨光学开关测量装置对脉冲进行测量。将10.3fs的超短脉冲通过0.5mm厚的LBO晶体,色散效应导致脉冲展宽,半峰值处的全宽度为39.6fs,实验结果表明,经过啁啾镜对一次色散补偿后的脉冲形状,半峰值处得全宽度为11.6fs;脉冲经过2次补偿后,脉冲被压缩到10.7fs。

A chirped dielectric multilayer mirror pair with controlled dispersion in the wavelength range 600nm^1100nm with 825 nm centre wavelength was designed and fabricated.The group delay dispersion of the mirror pair is about-100fs2.The reflectivity of the mirror is>99% and the theoretical group delay dispersion ripple is less than ±50fs2 in the working spectral range.The mirror pair was used to compensate the 10.3fs ultra-short pulse passed through 0.5 mm lithium triborate(LBO)crystal and the frequency-resolved optical gating technique was used to measure pulse,then the 10.3fs pulse was broadened to 39.6fs due to the dispersion of LBO crystal.Experimental results show that the full width at half summit is11.6fs after one bounce dispersion compensation of the chirped mirror pair;and the broaden pulse is compressed to 10.7fs by using two bounces dispersion compensation.