全啁啾镜色散补偿的亚8 fs钛宝石激光器

报道了一种基于全啁啾镜腔内色散补偿的、可长期稳定运行的亚8 fs钛宝石激光器.在4 W绿光抽运下, 可获得300 mW、86 MHz脉冲输出.腔内用于色散补偿的两对啁啾镜是国内自主设计自行镀膜的, 其对色散的精确控制可以在腔内不加尖劈对的情况下获得半宽超过150 nm超宽带输出.利用腔外色散补偿, 脉冲宽度被压缩至7.9 fs, 这是目前采用国产啁啾镜获得的最短脉宽, 也是无尖劈对谐振腔获得的最短脉宽.同时, 利用电路系统提供实时反馈调节, 可保证钛宝石激光器长期稳定运行, 24 h内功率抖动约0.6%.     

反射式棱栅对展宽器用于啁啾脉冲放大激光的研究

在啁啾脉冲放大(CPA)系统中, 脉冲的展宽是实现安全有效放大的重要保证. 本文介绍了一种新型的由色散棱镜与光栅组合而成的反射式棱栅对展宽器. 并利用光线追迹法对色散进行了数值模拟, 测量实验结果验证了理论计算的正确性. 在此基础上, 分析了以棱栅对为展宽器和ZF7玻璃材料为压缩器的下啁啾(down-chirped)脉冲放大系统中的色散比较传统的上啁啾脉冲放大系统, 结果表明棱栅对可以同时提供负的二阶色散和三阶色散, 这样能更好地补偿放大器中材料的高阶色散, 从而获得近傅里叶变换极限的压缩脉冲. 此外以块材料作为压缩器不仅提高了传输效率, 而且简化了实验装置, 增强了系统的稳定性. 这样的展宽压缩组合在高重复频率的飞秒啁啾脉冲放大系统中具有明显优势. 关键词： 反射式棱栅对 啁啾脉冲放大 色散 飞秒脉冲     

Long-Term Stabilization of Carrier-Envelope Phase for Few Cycles Ti：Sapphire Laser Amplifier

We realize a long-term carrier-envelope phase （CEP） stabilization for a chirped pulse amplified Ti：sapphire laser by locking the oscillator and amplifier independently. Based on the measurement of CEP by employing f-to-2f interference technique between the octave-spanning spectrum which is generated from a rare gas filled hollow fiber, continuous locking time up to 7.2 h with 85 mrad fluctuation is demonstrated. Finely compensating the dispersion by a set of chirped mirrors, quasi-mono cycle pulses as shorter as 3.8 fs are obtained. Further experimental research on high harmonic generation dependence on CEP shown the waveform of laser pulses has been successfully controlled.     

钛宝石飞秒激光器用色散补偿Gires-Tournois镜的研究

根据钛宝石飞秒激光器的色散补偿要求设计了单次反射平均补偿量为-60 fs²的GT(Gires-Tournois)镜,采用离子束辅助沉积技术结合光学监控技术制作了器件.用分光光度计对650—950 nm波段薄膜反射率进行测试,结果表明反射率测试曲线与设计曲线十分符合,同时利用白光干涉系统对群延迟色散进行了测试,测试结果与设计符合得很好,实际的色散曲线振荡基本控制在±20 fs²以内.应用该GT镜进行钛宝石飞秒激光系统的色散补偿,取得了很好的锁模效果,得到了29 fs的超短脉冲. 关键词： 色散补偿 钛宝石飞秒激光器 GT镜 离子束辅助沉积     

Frequency dependence of quantum path interference in non-collinear high-order harmonic generation

High-order harmonic generation(HHG) driven by two non-collinear beams including a fundamental and its weak second harmonic is numerically studied. The interference of harmonics from adjacent electron quantum paths is found to be dependent on the relative delay of the driving pulse, and the dependences are different for different harmonic orders.This frequency dependence of the interference is attributed to the spatial frequency chirp in the HHG beam resulting from the harmonic dipole phase, which in turn provides a potential way to gain an insight into the generation of high-order harmonics. As an example, the intensity dependent dipole phase coefficient α is retrieved from the interference fringe.