Chiu Jin-Chen, Chang Chia-Ming, Hsieh Bi-Zen, Lin Shu-Ching, Yeh Chao-Yung, Lin Gong-Ru, Lee Chao-Kuei, Lin Jiang-Jen, Cheng Wood-Hi
Department of Photonics, National Sun Yat-sen University, Kaohsiung, Taiwan.
Opt Express. 2011 Feb 28;19(5):4036-41. doi: 10.1364/OE.19.004036.
The dependence of thickness and concentration product (TCP) of single-wall carbon nanotubes saturable absorber (SWCNTs SA) on stabilizing and shortening pulsewidth in mode-locked fiber lasers (MLFLs) was investigated. We found that an optimized TCP for pulse energy and nonlinear self-phase modulation (SPM) enabled to determine the shorter pulsewidth and broader 3-dB spectral linewidth of the MLFLs. The shortest MLFL pulsewidth of 418 fs and broad spectral linewidth of 6 nm were obtained as the optimized TCP was 70.93 (μm•wt%), which was in good agreement with the area theorem prediction. This significant effect of TCP on pulse energy, SPM, pulsewidth, and spectral linewidth of MLFLs suggests that the TCP represents the total amount of SWCNTs in SA, which can be used as one of important and key parameters for characterizing the passive MLFL pulsewidth.
研究了单壁碳纳米管可饱和吸收体（SWCNTs SA）的厚度与浓度乘积（TCP）对锁模光纤激光器（MLFLs）中脉冲宽度稳定和缩短的依赖性。我们发现，针对脉冲能量和非线性自相位调制（SPM）优化的TCP能够确定MLFLs的更短脉冲宽度和更宽的3 dB光谱线宽。当优化的TCP为70.93（μm•wt%）时，获得了418 fs的最短MLFL脉冲宽度和6 nm的宽光谱线宽，这与面积定理预测结果吻合良好。TCP对MLFLs的脉冲能量、SPM、脉冲宽度和光谱线宽的这一显著影响表明，TCP代表了SA中SWCNTs的总量，可作为表征被动MLFL脉冲宽度的重要关键参数之一。
