Thulium-doped all-fiber mode-locked laser based on NPR and 45°-tilted fiber grating

Jianfeng Li, Zhijun Yan, Zhongyuan Sun, Hongyu Luo, Yulian He, Zhuo Li, Yong Liu, Lin Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

A nonlinear polarization rotation based all-fiber passively modelocked Tm3+-doped fiber laser is demonstrated by using a 45° tilted fiber grating (TFG) as an in-line polarizer. The 45° TFG centered at 2000 nm with polarization dependent loss (PDL) of >12 dB at 1850 nm∼2150 nm range was UV inscribed for the first time in SM28 fiber using a 244 nm Ar+ continuous wave laser and a phase mask with 25 mm long uniform pitch and titled period pattern of 33.7° with respect to the fiber axis. Stable soliton pulses centered at 1992.7 nm with 2.02 nm FWHM bandwidth were produced at a repetition rate of 1.902 MHz with pulse duration of 2.2 ps and pulse energy of 74.6 pJ. As increased pump power, the laser also can operate at noise-like regime with 18.1 nm FWHM bandwidth and pulse energy of up to 250.1 nJ. Using the same 45° TFG, both stable soliton and noise-like mode-locking centered at ∼1970 nm and ∼2050 nm, were also achieved by shortening and extending the length of Tm3+-doped fiber, respectively, exhibiting advantages of broadband and low insertion loss at 2 μm band.

Original languageEnglish
Pages (from-to)31020-31028
Number of pages9
JournalOptics Express
Volume22
Issue number25
Early online date1 Dec 2014
DOIs
Publication statusPublished - 5 Dec 2014

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