We demonstrate a tunable actively mode-locked fiber laser at 2 μm band. A segment of 4 m Tm-Ho-co-doped fiber is used as gain medium. Active mode locking pulse is realized by using intensity modulation and the signal source is high frequency sinusoidal signal. A tunable narrow bandwidth optical filter is used to narrow laser linewidth, suppress noise and achieve wavelength tuning. Stable actively mode-locked pulses with up to 2.2 GHz repetition rate is obtained, corresponding to 649 order harmonic mode-locked pulse train. The pulse width is about 200 ps. The signal-to-noise ratio of RF spectrum is 68 dB. The optical tuning range is 1907 nm~1927 nm.
Tunable high repetition rate actively mode-locked fiber laser at 2 μm
First published at:Oct 01, 2018
1 Geng J H, Wang Q, Jiang S B. 2μm fiber laser sources and their applications[J]. Proceedings of SPIE, 2011, 8164: 816409. DOI:10.1117/12.896259
2 Nakazawa M, Yoshida M, Hirooka T. The nyquist laser[J]. Optica, 2014, 1(1): 15–22. DOI:10.1364/OPTICA.1.000015
3 Coppinger F, Bhushan A S, Jalali B. Photonic time stretch and its application to analog-to-digital conversion[J]. IEEE Transactions on Microwave Theory and Techniques, 1999, 47(7): 1309–1314. DOI:10.1109/22.775471
4 Delfyett P J, Gee S, Choi M T, et al. Optical frequency combs from semiconductor lasers and applications in ultrawideband signal processing and communications[J]. Journal of Lightwave Technology, 2006, 24(7): 2701–2719. DOI:10.1109/JLT.2006.875948
5 Ozdur I, Akbulut M, Hoghooghi N, et al. A semiconductor-based 10-GHz optical comb source with sub 3-fs shot-noise-limited timing jitter and ∼500-Hz comb linewidth[J]. IEEE Photonics Technology Letters, 2010, 22(6): 431–433. DOI:10.1109/LPT.2010.2040980
6 Zhang M, Kelleher E J R, Torrisi F, et al. Tm-doped fiber laser mode-locked by graphene-polymer composite[J]. Optics Express, 2012, 20(22): 25077–25084. DOI:10.1364/OE.20.025077
7 Gumenyuk R, Vartiainen I, Tuovinen H, et al. Dissipative dispersion-managed soliton 2μm thulium/holmium fiber laser[J]. Optics Letters, 2011, 36(5): 609–611. DOI:10.1364/OL.36.000609
8 Yan Z Y, Sun B, Li X H, et al. Widely tunable Tm-doped mode-locked all-fiber laser[J]. Scientific Reports, 2016, 6: 27245. DOI:10.1038/srep27245
9 Wang X, Zhou P, Wang X L, et al. Pulse bundles and passive harmonic mode-locked pulses in Tm-doped fiber laser based on nonlinear polarization rotation[J]. Optics Express, 2014, 22(5): 6147–6153. DOI:10.1364/OE.22.006147
10 Zhou Y, Wang A T, Gu C, et al. Actively mode-locked all fiber laser with cylindrical vector beam output[J]. Optics Letters, 2016, 41(3): 548–550. DOI:10.1364/OL.41.000548
11 Kuznetsov A G, Kharenko D S, Podivilov E V, et al. Fifty-ps Raman fiber laser with hybrid active-passive mode locking[J]. Optics Express, 2016, 24(15): 16280–16285. DOI:10.1364/OE.24.016280
12 Wang X, Zhou P, Wang X L, et al. All-fiber actively mode-locked Tm-doped pulse laser at 2μm[J]. High Power Laser and Particle Beams, 2013, 25(10): 2477–2478. DOI:10.3788/hplpb20132510.2477
王雄, 周朴, 王小林, 等.全光纤主动锁模2 μm掺铥脉冲激光器[J].强激光与粒子束, 2013, 25(10): 2477–2478. DOI:10.3788/hplpb20132510.2477
13 Wang X, Zhou P, Wang X L, et al. 2-μm Tm-doped all-fiber pulse laser with active mode-locking and relaxation oscillation modulating[J]. IEEE Photonics Journal, 2013, 5(6): 1502206. DOI:10.1109/JPHOT.2013.2285726
14 Kneis C, Donelan B, Berrou A, et al. Actively mode-locked Tm3+-doped silica fiber laser with wavelength-tunable, high average output power[J]. Optics Letters, 2015, 40(7): 1464–1467. DOI:10.1364/OL.40.001464
15 Wang Y, Set S Y, Yamashita S. Active mode-locking via pump modulation in a Tm-doped fiber laser[J]. APL Photonics, 2016, 1(7): 071303. DOI:10.1063/1.4965249
16 Wang R X. Research on the theory and applications of the novel actively mode-locked fiber laser[D]. Beijing: Beijing University of Posts and Telecommunications, 2015.
Supported by National Science Foundation of China (91338116)
Get Citation: Ma Wanzhuo, Wang Tianshu, Wang Furen, et al. Tunable high repetition rate actively mode-locked fiber laser at 2 μm[J]. Opto-Electronic Engineering, 2018, 45(10): 170662.
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