Student High stability of frequency and robustness of noise-like pulse fiber laserWednesday (24.06.2020) 11:50 - 11:53 Room 1
A fiber ring laser, which is used nonlinear polarization rotation as the effect of saturable absorption, can oscillate with short pulse width. This ring laser can generate not only conventional short pulse but also noise-like pulse (NLP) that has myriad femtosecond pulses in picosecond or nanosecond envelope width. NLP changes its width of the pulse envelope dependent on pump energy and is expected picosecond or nanosecond pulse laser with high repetition ratio and pulse energy. However, the fiber ring laser has instability of pulse oscillating due to the polarization change in fiber, such as temperature fluctuation and vibration. We developed the noise-like pulse fiber laser with high robustness and repeatability of the envelope waveform. We fabricated a Fabry-Perot type of the resonator with a faraday rotator mirror (FRM) as a reflecting mirror to realize stable pulse oscillating. The FRM rotates polarization state of reflected light by 90 degrees against input light, and enables compensating polarization change by fiber birefringence fluctuation. Furthermore, our resonator is able to obtain the effect of saturable absorber without precise adjustment using a polarization controller, and has stability of pulse oscillating in principle. Our results confirm that intensity of each longitudinal mode until five modes has variability less than ±3.58%, and our resonator can obtain stable pulse waveform.
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