We demonstrate dual wavelength rectangular pulses in an ytterbium-doped fiber laser in a simple, all-fiber standing wave cavity configuration. The laser cavity consists of a nonlinear optical loop mirror as a saturable absorber at one end and two fiber Bragg gratings at the other end at wavelengths of 1025 and 1055 nm. There are three distinct regimes of operation in the cavity with an increase in the pump power, one where only 1025 nm wavelength pulses appear, then both 1025 and 1055 nm pulses are supported in the cavity after that, only 1055 nm wavelength pulses are present in the cavity. In the intermediate pumping regime, two sets of pulses are supported in the cavity. These pulses move in the cavity at different speeds and on the cross-over there is no interaction in the pulses. The mode-locked pulses at the 1025 nm wavelength are polarized, whereas pulses corresponding to 1055 nm are nearly unpolarized. Pulses corresponding to both the wavelength bands exhibit a dissipativ...

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锁模掺fiber光纤激光器中的双波长矩形脉冲

我们以简单的全光纤驻波腔配置演示了掺fiber光纤激光器中的双波长矩形脉冲。激光腔的一端为非线性光学环形镜作为可饱和吸收体，另一端为波长为1025和1055 nm的两个光纤布拉格光栅。随着泵浦功率的增加，腔中有三种不同的工作模式，一种仅出现1025 nm波长脉冲，然后在腔中同时支持1025和1055 nm脉冲，此后，腔中仅存在1055 nm波长脉冲。空腔。在中间泵送状态下，在腔中支持两组脉冲。这些脉冲以不同的速度在空腔中移动，并且在交叉点上，脉冲中没有相互作用。波长为1025 nm的锁模脉冲被极化，而对应于1055 nm的脉冲几乎未极化。对应于两个波段的脉冲均显示出耗散...