被动高阶谐波锁模掺Er^(3+)光纤激光超短光脉冲的产生及其放大

GENERATION AND AMPLIFICATION OF THE ULTRASHORT OPTICAL PULSES IN PASSIVE HARMONIC MODE-LOCKING Er^(3+)-DOPED FIBER LASER 

报道了利用光纤的非线性偏振旋转效应产生可饱和吸收体的锁模机制,从掺Er3+光纤环形腔激光器中产生稳定的高阶谐波锁模光脉冲的实验研究结果(限于示波器带宽,实验中最高曾测量到稳定的4076MHz重复频率的谐波锁模光脉冲).实验中发现有三种不同的演化方式产生高阶谐波锁模光脉冲,还观察到在8352MHz谐波锁模光脉冲的光谱中出现孤子光谱边带.四阶谐波锁模(8352MHz重复频率)超短光脉冲经过6m长高掺杂浓度的掺Er3+光纤放大器放大后产生了平均输出功率1388mW,脉宽201fs,中心波长1531μm,单脉冲能量为0166nJ,对应的光脉冲峰值功率0811×103W,增益19dB的放大结果.

The experimental results of the stable high\|order harmonic mode\|locking pulses generation and amplification in Er 3+ \|doped fiber amplifiers is reported. Using nonlinear polarization rotation (NPR) effect, the artifical saturable absorber is generated and the stable high\|order harmonic mode\|locking pulses have been generated from Er 3+ \|doped ring fiber laser (407\^6?MHz repetition rate harmonic mode\|locking has been obtained due to the limited bandwidth of the osciloscope). Three different ways have been found, through which high\|order harmonic mode\|locking pulses have been generated. The stable 4th harmonic mode\|locking (83\^52?MHz) pulses have been generated accompanying with soliton side\|band in the output spectra of the pulses. After the high concentration Er 3+ \|doped fiber amplification (6?m in length, 2700?ppm), the 4th harmonic mode\|locking pulses (83\^52?MHz) are amplified to an average power of 13.88?mW. The amplified pulses is of a pulse width 201?fs, with central wavelength of 1\^531?μm, single pulse energy of 0\^166?nJ corresponding to 0\^811×10\+3?W peak power, a gain of 19?dB with 83\^52?MHz repetition rate.