基于单壁碳纳米管的多波长被动锁模激光器

Multi-Wavelength PassivelyMode-Locked Laser Based on Single-Walled Carbon Nanotube

提出了一种基于单壁碳纳米管/聚酰亚胺复合材料薄膜和马赫-曾德尔型滤波器的多波长被动锁模掺铒光纤激光器。该环形腔掺铒光纤激光器以980nm的激光二极管作为抽运源,3.2m掺铒光纤作为增益介质,单壁碳纳米管作为可饱和吸收锁模器件。增加抽运功率到24mW时,得到中心波长为1559.3nm,3dB谱宽为1.4nm,平均输出功率为0.8mW的脉冲激光输出。然后在环形腔中,接入马赫-曾德尔型滤波器作为多波长选择器件,通过调整马赫-曾德尔型滤波器两臂光纤长度差,在室温下得到了3dB带宽内稳定的15个波长激光脉冲输出,波长间隔为0.1nm,连续0.5h观察,脉冲激光输出稳定。

Novel multi-wavelength passively mode-locked erbium-doped fiber laser based on single-walled carbon nanotube/polyimide film and Mach-Zehnder filter is proposed. A 3.2-m length of erbium-doped fiber acts as a gain medium. It is forward pumped by a 980-nm laser diode. The single-walled carbon nanotubes acts as mode locking devices. When pump power adds to 24 mW, the laser produces a stable pulse train with central wavelength of 1559.3 nm, 3 dB spectral width of 1.4 nm and average power of 0.8 mW. Then the Mach-Zehnder filter is introduced in the ring cavity as a comb filter. When the pump power is 25 mW, a stable 15-wavelength laser pulse is obtained by adjusting the polarization controller at the room temperature. The wavelength interval is 0.1 nm. The fiber laser can obtain stable multi-wavelength pulse train after continuous observation over 0.5 h.