Dvoretskiy Dmitriy A, Sazonkin Stanislav G, Orekhov Ilya O, Kudelin Igor S, Denisov Lev K, Karasik Valeriy E, Agafonov Viatcheslav N, Khabashesku Valery N, Davydov Valeriy A
Scientific and Educational Center "Photonics and IR Technology", Bauman Moscow State Technical University, 105005 Moscow, Russia.
Department of Physics, University of Colorado, Boulder, CO 80309, USA.
Nanomaterials (Basel). 2022 Nov 2;12(21):3864. doi: 10.3390/nano12213864.
We have studied the ultrafast saturation behavior of a high-density well-aligned single-walled carbon nanotubes saturable absorber (HDWA-SWCNT SA), obtained by a high-pressure and high-temperature treatment of commercially available single-wall carbon nanotubes (SWCNTs) and related it to femtosecond erbium-doped fiber laser performance. We have observed the polarization dependence of a nonlinear optical saturation, along with a low saturation energy level of <1 fJ, limited to the detector threshold used, and the ultrafast response time of <250 fs, while the modulation depth was approximately 12%. We have obtained the generation of ultrashort stretched pulses with a low mode-locking launching threshold of ~100 mW and an average output power of 12.5 mW in an erbium-doped ring laser with the hybrid mode-locking of a VDVA-SWNT SA in combination with the effects of nonlinear polarization evolution. Dechirped pulses with a duration of 180 fs were generated, with a repetition rate of about 42.22 MHz. The average output power standard deviation was about 0.06% RMS during 3 h of measurement.
我们研究了通过对市售单壁碳纳米管（SWCNT）进行高压和高温处理而获得的高密度排列良好的单壁碳纳米管可饱和吸收体（HDWA - SWCNT SA）的超快饱和行为，并将其与飞秒掺铒光纤激光器的性能相关联。我们观察到非线性光学饱和的偏振依赖性，以及低于1 fJ的低饱和能量水平（限于所使用的探测器阈值）和小于250 fs的超快响应时间，同时调制深度约为12%。在掺铒环形激光器中，通过VDVA - SWNT SA的混合锁模与非线性偏振演化效应相结合，我们以约100 mW的低锁模启动阈值和约12.5 mW的平均输出功率获得了超短拉伸脉冲的产生。产生了持续时间为180 fs、重复频率约为42.22 MHz的去啁啾脉冲。在3小时的测量过程中，平均输出功率标准偏差约为0.06% RMS。
