Jang M, Kim M, Kim HS.  Mode-locking Condition Analysis of an Optical Fiber Laser with λ/4 plate, λ/2 Plate, and a Polarizer Sequentially Installed Inside for Mode-locked Pulse Generation via the Nonlinear Polarization Rotation Effect in an Optical Fiber.  NPSM 2023;73:1001-1008.  https://doi.org/10.3938/NPSM.73.1001