Chinese Optics Letters, Volume. 23, Issue 4, 040606(2025)
Single-frequency narrow-linewidth fiber laser based on whispering gallery resonators and dynamic population gratings
Fig. 1. Characteristic of the specially designed WGMR. (a) The transmission spectrum of the WGMR. (b) The backward Rayleigh scattering spectrum of the WGMR. (c) The schematic layout of the WGMR with the over-coupling structure (OCS). acw and accw are the amplitudes of the CW and CCW modes of the resonator, respectively. Bin and Bout are the incident and transmitted lights in the resonator. (d) High resolution photograph of the WGMR.
Fig. 2. Schematic layout of the self-built WGMR fiber lasers. (a) The structure of the laser is filtered only by the WGMR. (b) The DPG is connected with the laser in (a). In all fiber lasers, the length and absorption coefficient of EDF are 0.8 m and 24 dB/km @1550 nm. ISO, optical isolator; CIR, optical circulator; OC, optical coupler; PC, polarization controller.
Fig. 3. Optical spectrum of the self-built lasers. (a), (b), and (d) show the spectra of laser
Fig. 4. Spectrum of the self-built laser
Fig. 5. Lasing spectrum of single-frequency laser
Fig. 6. Power output versus power of pump. Solid dots, the measured maximum; circles, the measured minimum; dotted curves, average of the maximum and minimum. (a) The power of the laser
Fig. 7. Schematic layout of the DSHI and the spectrum of the beating linewidth. (a) The DSHI used for the measurement of the laser linewidth. OC, optical coupling; AOM, acoustic optical modulator; AWG, arbitrary waveform generator for radio frequency; PD, photodiode; ESA, electronic spectrum analyzer. (b) The spectrum of the beating linewidth. Gray dashed curve, the spectrum measured. Blue solid curve, the spectrum from Lorentz fitting.
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Ziyun Wang, Fangxing Zhang, Ziyu Lei, Jiwen Cui, Jiubin Tan, "Single-frequency narrow-linewidth fiber laser based on whispering gallery resonators and dynamic population gratings," Chin. Opt. Lett. 23, 040606 (2025)
Category: Fiber Optics and Optical Communications
Received: Aug. 5, 2024
Accepted: Nov. 4, 2024
Published Online: Apr. 24, 2025
The Author Email: Jiwen Cui (cuijiwen@hit.edu.cn)