We study and experimentally demonstrate a sensitive single-shot correlation system in which only a diffraction grating is used to produce a transverse time delay (TTD) in the reference pulse. The mechanism of the TTD introduced by the grating and the formation of the relative time delay (RTD) in the noncollinear correlation system are analyzed in detail. By using our system, we successfully measured the temporal duration of picosecond laser pulses, and a time resolution of ～0.047 ps is obtained at 1047 nm. The impact of the grating dispersion and the second harmonic beam walk-off effect on the measurement are considered.

研究增益介质、电光晶体在高重复频率运转条件下,其热效应对皮秒激光再生放大器的影响。对Nd∶YAG激光晶体热致退偏和KD*P电光晶体热吸收进行了测量,利用补偿元件有效地补偿了激光晶体的热致退偏,并自行设计了采用BBO电光晶体的再生放大器普克尔盒,实现了对皮秒激光脉冲的有效放大,获得了在1 kHz重复频率下单脉冲能量为3 mJ,放大倍数为3×106的激光二极管(LD)侧面抽运Nd∶YAG千赫兹皮秒再生放大1064 nm激光输出。

Two operating modes, independent self-mode-locking and cross-mode-locking, are presented in a two-beam-pumped double-cavity dual-wavelength femtosecond Ti:sapphire laser. Synchronization of femtosecond and picosecond laser pulses is achieved by properly adjusting the cavity length matching and distributing the pump laser powers in the two laser cavities, and moreover, a timing jitter of 517 fs between femtosecond and picosecond pulses is obtained, with wavelength tuning ranges around 36 and 22 nm in the femtosecond and picosecond cavities, respectively.

报道了针对二维卟啉类有机分子材料的光学非线性性质研究，讨论了几种非对称配置电负性分子团对构成分子的光学非线性的影响，表明配置的分子基团电负性越大，合成分子的非线性超极化率越大。实验研究了这些分子的光学非线性响应特性，分析了各种非线性机制在分子非线性响应中的作用。