Shaokang Bai, Yaqiong Lu, Zuxing Zhang. Mode field switching in narrow linewidth mode-locked fiber laser[J]. Chinese Optics Letters, 2022, 20(2): 020602
- Chinese Optics Letters
- Vol. 20, Issue 2, 020602 (2022)
Fig. 1. Acousto-optic filtering spectra at different wavelengths.
Fig. 2. Reflection spectra of the FM-FBG under (a) acousto-optic non-resonance and (b) acousto-optic resonance; the laser output spectra in the CW state under (c) acousto-optic non-resonance and (d) acousto-optic resonance.
Fig. 3. Schematic diagram of mode-field switchable narrow linewidth mode-locked fiber laser. WDM, wavelength-division multiplexer; Cir, fiber circulator; PC, polarization controller; MS, mode stripper; RF, radio frequency generator; SESAM, semiconductor saturable absorber mirror.
Fig. 4. Mode-locked output spectrum under the non-resonant state.
Fig. 5. (a) Mode-locked pulse sequence under the non-resonant state and (b) the corresponding RF spectrum within the frequency range of 100 Hz, with the RBW of 1 Hz (inset: RF spectrum in the 2 GHz range).
Fig. 6. Mode-locked spectrum under the resonant state.
Fig. 7. (a) Mode-locked pulse sequence under the resonant state and (b) the corresponding RF spectrum within the frequency range of 100 Hz, with the RBW of 1 Hz (inset: RF spectrum in the 2 GHz range).
Fig. 8. Optical intensity distribution of output 2 under the resonant state.
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