We investigated the behavior of a fiber-ring polarization-maintaining passively mode-locked ytterbium-doped laser in a broad range of dispersion values; i.e. from highly net-normal to net-anomalous, with a special emphasis near the zero of chromatic dispersion. Different lengths of an ad hoc polarization-maintaining photonic crystal fiber were used as intracavity dispersion compensator to shift the operation of this laser from net-normal to the net-anomalous regime. The laser generated the shortest light pulses around the zero of dispersion: 6 ps/7ps for—0.023 ps 2 /0.045 ps 2 ; in both cases, pulses were not transform-limited, being theoretically possible an out-of-cavity recompression down to 170 fs/220 fs, respectively. In the net-normal regime, we obtained a stable, ultra-low frequency, emission at 1.19 MHz, with pulses with a FWHM of 162 ps and pulse energy of 115 pJ. This laser presents a somewhat symmetrical behavior at both sides of the zero of dispersi...

中文翻译：

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所有保持偏振的被动锁模光纤环掺激光器；从净正色散到净异常色散

我们研究了在宽色散值范围内保持光纤环偏振的被动锁模掺激光器的行为。即从高净法线到净异常，特别强调接近色散零。使用不同长度的临时保偏偏振光子晶体光纤作为腔内色散补偿器，以使该激光器的操作从纯净态转变为纯净态。激光在色散零附近产生了最短的光脉冲：6 ps / 7ps，对于-0.023 ps 2 /0.045 ps 2；在这两种情况下，脉冲均不受变换限制，理论上，腔外再压缩分别降至170 fs / 220 fs是可能的。在净常态下，我们获得了稳定的超低频发射，频率为1.19 MHz，FWHM为162 ps的脉冲和115 pJ的脉冲能量。该激光在色散零的两侧都表现出某种对称的特性。