Demirbas Umit, Sennaroglu Alphan, Kärtner Franz X, Fujimoto James G
Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics,Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Opt Lett. 2009 Feb 15;34(4):497-9. doi: 10.1364/ol.34.000497.
We describe the generation of enhanced pulse energies using a multipass-cavity (MPC) Cr(3)+:LiCAF laser, pumped by inexpensive, single spatial mode laser diodes. A semiconductor saturable absorber was used for stable mode-locked operation. The MPC reduced the pulse repetition rate to the approximately 10 MHz level, scaling pulse energies and intensities. With only 540 mW of absorbed pump power, 98 fs pulses with energies of 9.9 nJ and peak powers of approximately 101 kW, corresponding to 95 mW of average power at a repetition rate of 9.58 MHz, were generated. By increasing the intracavity negative dispersion, 310 fs pulses with energies of 15.2 nJ and peak powers of approximately 49 kW, corresponding to 160 mW of average power at 10.51 MHz repletion rate, were also generated. These results demonstrate that low-cost MPC Cr(3+)-doped colquiriite lasers can generate pulse energies and intensities comparable to more expensive Ti:sapphire lasers.
我们描述了使用多通腔（MPC）Cr(3)+:LiCAF激光器产生增强脉冲能量的方法，该激光器由价格低廉的单空间模式激光二极管泵浦。使用半导体可饱和吸收体实现稳定的锁模运行。多通腔将脉冲重复率降低到约10 MHz水平，从而扩大了脉冲能量和强度。仅用540 mW的吸收泵浦功率，就产生了能量为9.9 nJ、脉宽为98 fs、峰值功率约为101 kW的脉冲，对应于9.58 MHz重复率下95 mW的平均功率。通过增加腔内负色散，还产生了能量为15.2 nJ、脉宽为310 fs、峰值功率约为49 kW的脉冲，对应于10.51 MHz重复率下160 mW的平均功率。这些结果表明，低成本的多通腔Cr(3+)掺杂的锂钙铝氟化物激光器能够产生与更昂贵的钛宝石激光器相当的脉冲能量和强度。
