Abstract

Harmonic mode locking (HML) was proved to be an effectively technique for generating high repetition rate ultrafast pulses. However, none of the various research methods currently used could improve the defects of HML's low signal to noise ratio (SNR), mostly less than 40 dB, limiting its further application. Using the self-made single walled carbon nanotubes (SWCNTs) as saturable absorber (SA) in an erbium-doped fiber laser to obtain HML pulses with an ultra-high SNR (>62 dB) was reported here. A series of harmonics from fundamental frequency to sixth orders could be observed by simply increasing the pump power, and the all-polarization-maintaining (PM) fiber path ensured time domain frequency stability. Moreover, by adjusting the polarization direction of the directional SA, a stable traditional soliton pulse was obtained. In this mode, the repetition frequency no longer split with the increase of pump power, and the SNR was as high as 83 dB. Such an environmentally stable, all-PM fiber, versatile operations laser could not only expand the industrial application prospects of high repetition frequency HML pulses, but also be an excellent seed source for ultra-high-power lasers research.

High-power, high signal-to-noise ratio single-frequency 1 μm Brillouin all-fiber laser

Jing Wang, Yubin Hou, Qian Zhang, Dongchen Jin, Ruoyu Sun, Hongxing Shi, Jiang Liu, and Pu Wang
Opt. Express 23(22) 28978-28984 (2015)

570 MHz harmonic mode-locking in an all polarization-maintaining Ho-doped fiber laser

Chao Yang, Baoquan Yao, Yi Chen, Gaoyou Liu, Shuyi Mi, Ke Yang, Tongyu Dai, and Xiaoming Duan
Opt. Express 28(22) 33028-33034 (2020)

Ultra-low noise all polarization-maintaining Er fiber-based optical frequency combs facilitated with a graphene modulator

N. Kuse, C.-C. Lee, J. Jiang, C. Mohr, T. R. Schibli, and M.E. Fermann
Opt. Express 23(19) 24342-24350 (2015)

Microfiber-based WS₂-film saturable absorber for ultra-fast photonics

Peiguang Yan, Aijiang Liu, Yushan Chen, Hao Chen, Shuangchen Ruan, Chunyu Guo, Sifan Chen, Irene Ling Li, Haipeng Yang, Juguang Hu, and Guangzhong Cao
Opt. Mater. Express 5(3) 479-489 (2015)

All-polarization maintaining, graphene-based femtosecond Tm-doped all-fiber laser

Grzegorz Sobon, Jaroslaw Sotor, Iwona Pasternak, Aleksandra Krajewska, Wlodek Strupinski, and Krzysztof M. Abramski
Opt. Express 23(7) 9339-9346 (2015)