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We report on the actively mode-locked and relaxation-oscillation-modulated 2- &#x03BC;m all-fiber laser, using an electronic optical phase modulator with fiber pigtail. Linear-cavity and ring-cavity fiber lasers with Tm-doped fiber were set up with a center wavelength around 1.95 &#x03BC;m. Actively mode-locked stable pulse train was generated with a repetition rate of 11.884 MHz (linear cavity) and 12.099 MHz (ring cavity), and the duration of the pulse was 816 ps and 446 ps, respectively. The stable pulse train with a duration of 5.885 &#x03BC;s and a repetition rate of 4-18 kHz was generated by actively modulating the relaxation oscillation of the linear-cavity fiber laser. Similar results for the ring-cavity fiber laser were 1.554 &#x03BC;s and 6-26 kHz, respectively. All the stable pulse trains' energy fluctuations were less than 7%.

ieee photonics journal

2-<formula formulatype="inline"><tex Notation="TeX">$\mu\hbox{m}$</tex></formula> Tm-Doped All-Fiber Pulse Laser With Active Mode-Locking and Relaxation Oscillation Modulating

2-$\mu\hbox{m}$ Tm-Doped All-Fiber Pulse Laser With Active Mode-Locking and Relaxation Oscillation Modulating