基于类噪声脉冲抽运的平坦超连续谱光源

Flat super-continuum spectrum light source based on noise-like pulse pumping

设计了一种由类噪声脉冲抽运的全光纤结构平坦超连续谱光源。在色散管理掺铒光纤激光器中通过调节腔内偏振态,在泵浦功率为450 mW时,实现了稳定的类噪声脉冲锁模,锁模脉冲的中心波长为1600 nm,脉冲宽度为303 fs。在最大泵浦功率为1 W时,谐振腔直接输出功率为8.6 mW。较低的功率无法有效拓展超连续谱宽度,为此设计一种掺铒光纤放大器进行功率放大,放大器最大输出功率为338 mW,将功率放大后的类噪声脉冲耦合进高非线性光纤以产生超连续谱,超连续谱的20 dB光谱范围为1530 nm~2300 nm,在1736 nm~2134 nm范围内,光谱的平坦度优于0.5 dB。

A flat super-continuum spectrum light source of all-fiber structure based on noise-like pulse pumping was designed.In the dispersion-managed erbium-doped fiber laser,by adjusting the polarization state in the cavity,when the pump power was 450 mW,the stable noise-like pulse mode locking was achieved,the center wavelength was 1600 nm,and the pulse width was 303 fs.When the maximum pump power was 1 W,the direct output power of the resonator was 8.6 mW,and the lower power could not effectively expand the width of the super-continuum spectrum.Therefore,an erbium-doped fiber amplifier was designed for power amplification,and the maximum output power was 338 mW.The power-amplified noise-like pulse was coupled into the highly nonlinear fiber to obtain a super-continuum spectrum.The 20 dB spectral range of super-continuum spectrum is 1530 nm~2300 nm,and in the range of 1736 nm~2134 nm,the flatness of the spectrum is less than 0.5 dB.