首次报道了中心波长为1958 nm的增益开关锁模铥/钬共掺光纤激光器, 增益开光脉冲包络和锁模次脉冲的重复频率分别为20 kHz和14.8 MHz。将此增益开关锁模光纤激光作为种子源, 在掺铥光纤放大器中产生了平坦的超连续谱光源。超连续谱的最大输出功率为2.17 W, 其长波长边已扩展到2750 nm, 10 dB带宽约为640 nm(光谱范围1953~2593 nm)。

The effective absorption coefficient with time of strong absorbing aerosol made of carbon dusts and water of internal mixture is analyzed, and the influence of different wavelengths and radius ratios on it is discussed. The shorter the wavelength is, the larger the effective absorption coefficient is, and more quickly it increases during 1-100 μs. The increase of the effective absorption coefficient during 1-100 μs is larger than that during 100-1000 μs, and the largest increase is 132.65% during 1-100 μs. Different ratios between inner and outer radius have large influence on the effective absorption coefficient. The larger the ratio is, the larger the effective absorption coefficient is, and more quickly it increases during 1-100 μs. The increase of the effective absorption coefficient during 1-100 μs is larger than that during 100-1000 μs, and the largest increase is 138.66% during 1-100 μs.