摘要
操控多路激光脉冲之间的相对延时(相对相位)对于亚周期相干合成技术意义重大.当周期量级脉冲之间的相对延时接近数十飞秒时,常见的飞秒脉冲测量手段已无法满足脉冲之间相对相位的精确调控需求.本文基于瞬态光栅频率分辨光学开关装置,精确反演出脉冲之间的相对相位.此方案不仅有助于直接产生亚周期(亚飞秒)脉冲,还可应用于时间隐身学和二维相干光谱学等相关领域.
The accurate and precise controlling of the attosecond time delay between the sub-pulses within a hundredth of an optical cycle is the key ingredient for the sophisticated custom-tailored coherent waveform synthesizer. The attosecond delay control technique commonly experiences the ＂complete＂ characterization of the ultrashort sub-cycle pulses, which includes the spatiotemporal pulse characterization of the synthesized waveform and the attosecond relative delay between the parent pulses. In this work, the relative time delay between spectrally separated ultrashort parent pulses is characterized in an interferometer scheme with a background-free transient-grating frequency-resolved optical grating（TG-FROG）. The TG-FROG geometry accurately measures the full time-dependent intensity and phase of ultrashort laser pulses in a wide range of regime（from ultraviolet to infrared） and offers significant advantages over other nonlinear-optical processes geometries（i.e., the polarization-gate-FROG, the self-diffraction-FROG, the second-harmonic generation-FROG and the third-harmonic-generation-FROG）. The attosecond measurement accuracy is achieved for the first time, to the best of our knowledge. In this experiment, the output of a carrier-envelope-phase-stable Ti：sapphire amplifier（sub-30-fs, over-1-mJ, 1 kHz） is spectrally broadened in a neon-filled hollow-core fiber with an inner diameter of250 μm. The transmission through the pressure-gradient hollow-core fiber results in an mJ-level octave-spanning whitelight supercontinuum, supporting a sub-3-fs Fourier transform-limited pulse. The supercontinuum is spectrally divided into two parent pulses by using a dichroic mirror. The sub-pulses are individually compressed by the custom-designed double-chirped mirrors and wedge pairs. The short and long wavelength pulses are separately compressed in few-cycle regime, yielding pulses with 6.7 fs and 9.8 fs, respectively. This technique overcomes the bottlenecks in the traditional delay measurement and should b
作者
黄沛
方少波
黄杭东
赵昆
滕浩
侯洵
魏志义
Huang Pei;Fang Shao-Bo;Huang Hang-Dong;Zhao Kun;Teng Hao;Hou Xun;Wei Zhi-Yi(State Key Laboratory of Transient Optics and Photonics,Xi＇an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences,Xi＇an 710119,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2018年第21期156-162,共7页
Acta Physica Sinica
基金
国家重点研发计划(批准号:2017YFC0110301)
国家自然科学基金(批准号:61575219)
中国科学院战略性先导科技专项(B类)(批准号:XDB23030230)
中国科学院前沿科学重点研究计划(批准号:YZDJ-SSW-JSC00)
中国科学院青年创新促进会(批准号:2018007)资助的课题~~
关键词
亚周期脉冲
相干合成
相对延时
飞秒脉冲测量
sub-cycle waveform
coherent synthesis
relative delay
transient-grating frequency-resolved optical grating
