Observation of 550 MHz passively harmonic mode-locked pulses at L-band in an Er-doped fiber laser using carbon nanotubes film

We demonstrate a passively harmonic mode-locked(PHML) fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol(CNTs-PVA) film. Under suitable pump power and an appropriate setting of the polarization controller(PC), the 54~(th) harmonic pulses at the L-band are generated with the side mode suppression ratio(SMSR) better than 44 dB and a repetition frequency of 503.37 MHz. Further increasing the pump power leads to a higher frequency of 550 MHz with compromised stability of 38.5 dB SMSR. To the best of our knowledge, this is the first demonstration on the generation of L-band PHML pulses from an Er-doped fiber laser based on CNTs.     

多元方差分析中显著变量子集的筛选

本文将逐步方法引入多元方差分析中,建立筛选显著变量子集的统计分析方法。给出一应用实例,表明这一方法在精简观测变量和提高检验的灵敏度方面都有重要的作用。     

南海南部表层碳酸盐沉积

本文应用研究区内127个站表层样品,研究了碳酸盐沉积物特征,并综合分析了沉积物类型和碳酸盐沉积物的生物、矿物、地球化学组成等。根据碳酸盐沉积和岩性参数变化和相应的沉积环境及沉积作用,将本区分成6个沉积相,并阐明各沉积相的分布和特征。     

Passively harmonic mode-locked erbium-doped fiber laser at a 580 MHz repetition rate based on carbon nanotubes film

We propose and demonstrate a passively harmonic mode-locked erbium-doped fiber laser(EDFL) using carbon nanotubes polyvinyl alcohol(CNTs-PVA) film. The laser allows generation of the pulses with a repetition rate of 580 MHz, which corresponds to the 22nd harmonics of a 26.3 MHz fundamental repetition rate under 323 mW pump power. A particularly noteworthy feature of the pulses is the super-mode suppression ratio(SMSR), which is over 40 dB, indicating a stable operation.