Ahmad H, Soltanian M R K, Pua C H, Alimadad M, Harun S W
Appl Opt. 2014 Jun 1;53(16):3581-6. doi: 10.1364/AO.53.003581.
A Q-switched dual-wavelength fiber laser with narrow channel spacing is proposed and demonstrated. The fiber laser is built around a 3 m long erbium doped fiber as the gain medium and a 10 cm long photonic crystal fiber (PCF) as the element used to generate the dual-wavelength output. The PCF has a solid core approximately 4.37 μm in diameter and is surrounded by microscopic air-holes with a diameter of about 5.06 μm each as well as a zero-dispersion wavelength of about 980 nm. A graphene oxide based saturable absorber is used to generate the desired pulsed output. At the maximum pump power of 72 mW the laser is capable of generating pulses with a repetition rate and pulse-width of 31.0 kHz and 7.0 μs, respectively, as well as an average output power and pulse energy of 0.086 mW and 2.8 nJ, respectively. The proposed fiber laser has substantial potential for use in applications that require longer duration pulsed outputs such as in range finding and terahertz radiation generation.
提出并演示了一种具有窄通道间距的调Q双波长光纤激光器。该光纤激光器以一根3米长的掺铒光纤作为增益介质，以一根10厘米长的光子晶体光纤（PCF）作为产生双波长输出的元件构建而成。该光子晶体光纤具有一个直径约为4.37微米的实心纤芯，周围环绕着直径约为5.06微米的微小气孔，零色散波长约为980纳米。使用基于氧化石墨烯的可饱和吸收体来产生所需的脉冲输出。在72毫瓦的最大泵浦功率下，该激光器能够分别产生重复频率为31.0千赫兹、脉冲宽度为7.0微秒的脉冲，以及平均输出功率为0.086毫瓦、脉冲能量为2.8纳焦的脉冲。所提出的光纤激光器在需要更长持续时间脉冲输出的应用中具有巨大潜力，例如在测距和太赫兹辐射产生方面。
