El-Sherif Ashraf F, King Terence A
Laser Photonics Research Group, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
Opt Lett. 2003 Jan 1;28(1):22-4. doi: 10.1364/ol.28.000022.
A peak output power of greater than 4.1 kW and a pulse duration at FWHM of 150 ns have been obtained in a Q-switched Tm3+-doped silica fiber laser in the wavelength region near 2 microm when the laser was pumped with a Nd:YAG laser operating at 1.319 microm. An acousto-optic modulator was used as a Q-switching element and operated at repetition rates of as much as 30 kHz. A core diameter of 17 microm was used to increase the laser gain volume, permitting high-pump-power absorption and an output of high pulse energy and peak power. Stimulated Brillouin scattering was directly observed in the output pulse, and as much as 10 orders of stimulated Brillouin scattering was recorded. This is the first report to the authors' knowledge of high-peak-power operation of a Tm3+-fiber laser.
当用工作在1.319微米波长的Nd:YAG激光器泵浦时，在波长接近2微米的调Q掺Tm³⁺石英光纤激光器中，获得了大于4.1千瓦的峰值输出功率和150纳秒的半高宽脉冲持续时间。采用声光调制器作为调Q元件，其重复频率高达30千赫兹。使用17微米的纤芯直径来增加激光增益体积，从而实现高泵浦功率吸收以及高脉冲能量和峰值功率输出。在输出脉冲中直接观察到了受激布里渊散射，并记录到多达10阶的受激布里渊散射。据作者所知，这是关于Tm³⁺光纤激光器高峰值功率运行的首次报道。
