Voropaev Vasilii, Batov Daniil, Voronets Andrey, Vlasov Dmitrii, Jafari Rana, Donodin Aleksandr, Tarabrin Mikhail, Trebino Rick, Lazarev Vladimir
Science and Education Center for Photonics and IR-Technology, Bauman Moscow State Technical University, Moscow, Russia, 105005.
Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Sci Rep. 2021 Dec 8;11(1):23693. doi: 10.1038/s41598-021-02934-4.
The duration reduction and the peak power increase of ultrashort pulses generated by all-fiber sources at a wavelength of [Formula: see text] are urgent tasks. Finding an effective and easy way to improve these characteristics of ultrafast lasers can allow a broad implementation of wideband coherent supercontinuum sources in the mid-IR range required for various applications. As an alternative approach to sub-100 fs pulse generation, we present an ultrafast all-fiber amplifier based on a normal-dispersion germanosilicate thulium-doped active fiber and a large-mode-area silica-fiber compressor. The output pulses have the following characteristics: the central wavelength of [Formula: see text], the repetition rate of 23.8 MHz, the energy per pulse period of 25 nJ, the average power of 600 mW, and a random output polarization. The pulse intensity and phase profiles were measured via the second-harmonic-generation frequency-resolved optical gating technique for a linearly polarized pulse. The linearly polarized pulse has a duration of 71 fs and a peak power of 128.7 kW. The maximum estimated peak power for all polarizations is 220 kW. The dynamics of ultrashort-pulse propagation in the amplifier were analyzed using numerical simulations.
降低全光纤源在波长为[公式：见原文]时产生的超短脉冲的持续时间并提高其峰值功率是紧迫任务。找到一种有效且简便的方法来改善超快激光器的这些特性，能够使宽带相干超连续谱源在各种应用所需的中红外波段得到广泛应用。作为产生亚100飞秒脉冲的一种替代方法，我们展示了一种基于正常色散锗酸盐掺铥有源光纤和大模面积石英光纤压缩器的超快全光纤放大器。输出脉冲具有以下特性：中心波长为[公式：见原文]，重复频率为23.8兆赫兹，每个脉冲周期的能量为25纳焦，平均功率为600毫瓦，且输出偏振随机。通过二次谐波产生频率分辨光学门控技术测量了线性偏振脉冲的脉冲强度和相位分布。该线性偏振脉冲的持续时间为71飞秒，峰值功率为128.7千瓦。所有偏振情况下估计的最大峰值功率为220千瓦。使用数值模拟分析了超短脉冲在放大器中的传播动力学。
