Author Affiliations
Abstract
1 School of Electronic and Information Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
2 School of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
3 College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China
4 e-mail: yaoyong@hit.edu.cn
We reported on the generation of the dual-wavelength rectangular pulse in an erbium-doped fiber laser (EDFL) with a topological insulator saturable absorber. The rectangular pulse could be stably initiated with pulse width from 13.62 to 25.16 ns and fundamental repetition rate of 3.54 MHz by properly adjusting the pump power and the polarization state. In addition, we verified that the pulse shape of the dual-wavelength rectangular pulse can be affected by the total net cavity dispersion in the fiber laser. Furthermore, by properly rotating the polarization controllers, the harmonic mode-locking operation of the dual-wavelength rectangular pulse was also obtained. The dual-wavelength rectangular pulse EDFL would benefit some potential applications, such as spectroscopy, biomedicine, and sensing research.
Mode-locked lasers Nonlinear optics, fibers Nonlinear optical materials Photonics Research
2015, 3(3): 03000094
宜春学院物理科学与工程技术学院, 江西 宜春 336000
利用Cr:YAG和声光锁模器联合对光纤耦合LD抽运Nd:YAG激光器进行主被动锁模, 比较和分析了Cr:YAG被动锁模,声光锁模器主动锁模及两者联合主被动锁模三种情况下平均输出功率的特性, 结果表明主被动联合锁模克服了主动锁模稳定性差、被动锁模输出功率低、锁模不完全的缺点, 得到幅值和能量抖动小于、锁模深度100%、脉宽小于410ps、输出平均功率290mW的绿光锁模脉冲。
激光技术 主被动锁模 声光锁模器 光纤耦合 laser techniques actively-passively mode locking Cr:YAG Cr:YAG acousto-optic mode-locker fiber coupling
为了克服主动锁模脉冲能量低、被动调Q锁模稳定性差、锁模不完全的缺点，采用Cr4+∶YAG和声光锁模器进行主被动联合锁模脉冲氙灯抽运的Nd∶YAG激光器，实验验证和分析了Cr4+∶YAG被动锁模，声光锁模器主动锁模及两者联合主被动锁模3种情况下输出脉冲的特性。结果表明，主被动联合锁模可得到200mJ输出能量、输出幅值和能量抖动小于±5％、锁模深度100％、脉宽小于450ps的1064nm锁模脉冲输出，腔外增加KTP倍频晶体，可得到约41%的转换效率的532nm稳定锁模脉冲输出。 这一结果验证了主被动锁模技术的可行性，有利于锁模技术的进一步发展。
激光器 声光锁模器 主被动锁模 抽运 lasers Cr4+∶YAG Cr4+∶YAG acousto-optic mode-locker actively-passively mode lock pumping
